CH Precision T1 10MHz Time Reference User Manual

CH Precision T1 10MHz Time Reference

The T1 10MHz Time Reference is a high-quality and versatile product designed to set the tempo for all digital pieces of audio equipment in a system. With an ultra-low phase noise, high accuracy 10MHz oven-controlled oscillator (OCXO), the T1 brings pivotal timing accuracy that enables CD players, digital to analog converters, and any digital audio products equipped with a SYNC input to function optimally.

Product Highlights

• 6 configurable 75 Ohm BNC outputs
• Individually output low or high-level sine or square-waves
• The external reference input to lock on an external TTL reference signal
• All internal signal paths use analog pieces of the circuitry for the cleanest, most linear behavior from the heart to outputs
• Rigorous metal work construction with no visible screws on front, top, and side panels
• The power supply consists of three regulation circuits serially connected for the cleanest and lowest noise power supplies.

Product Usage Instructions

To use the T1 10MHz Time Reference, follow the steps below:

1. Connect the T1 to your audio system using the 6 configurable 75 Ohm BNC outputs.
2. Configure the output to low or high-level sine or square waves as needed.
3. If desired, connect an external TTL reference signal to the T1’s external reference input.
4. Ensure the T1 is powered on.
5. Enjoy your music collection with the T1 installed in your system for optimal performance.

If you encounter any issues with the T1, refer to the troubleshooting section in the user manual. For further technical specifications, refer to the specifications section in the user manual.

Dear Valued Customer,
We are honored that you chose the T1 10MHz Time Reference for your audio system. Our team devoted every effort to designing and manufacturing this highest-quality versatile and future-proof product and is proud to present it to you. We wish you hours of enjoyment from your music collection with your T1 10MHz Time Reference installed in your system. Before you embark on your musical journey, we kindly request your special attention regarding the information contained in this manual. The T1, as you will discover in the following pages, is a Swiss precision product designed for ultimate performance and flexibility. However, reaching sonic excellence from your audio system requires your unit to be set up and operated correctly and this is what this manual is all about. If you have any questions or require assistance, please don’t hesitate to contact your authorized dealer.
We hope you will enjoy your T1 for many years to come.
The Concert has just begun…

Product highlights

• CH products are rigorously designed and manufactured in Switzerland by CH Precision Sàrl. Our engineers combined their know-how, expertise, and ingeniousness to present you with the T1, a top-performance future-proof time reference unit with Ethernet control and USB flash-drive firmware update capabilities.
• The T1 is the heart of any digital audio system. It sets the tempo of all the digital pieces of audio equipment in a system. Based around an ultra-low phase noise, high accuracy 10MHz oven-controlled oscillator (OCXO), the T1 brings the pivotal timing accuracy that enables CD players, digital to analog converters, and any digital audio products equipped with a SYNC input to function optimally.
• The T1 features 6 configurable 75 Ohm BNC outputs, capable of individually outputting low or high-level sine or square waves. This ensures maximum compatibility with equipment capable of locking to a 10MHz clock signal. Besides, an external reference input has been provided to allow the T1 to lock on an external TTL reference signal.
• Despite interfacing with digital pieces of equipment, The T1 was designed as a purely analog product, where all the internal signal paths are using analog pieces of circuitry. This ensures the T1 with the cleanest, most linear behavior from its heart to its outputs.
• Oscillators are highly sensitive to temperature variations as well as to mechanical vibrations. To minimize the susceptibility to these parameters, the T1oscillator is tightly encapsulated inside a heavy block of aluminum. In addition to the benefits the unit’s chassis brings, the aluminum block greatly decreases the susceptibility to temperature variations, creating an extra layer of encapsulation. Besides, the aluminum block solely rests on Alpha gel pads. The alpha gel is a soft silicone gel that works as a structure-borne vibration isolation system, while the T1 outer enclosure provides efficient airborne vibration isolation. The oscillator module is
• ”floating” on the Alpha gel pads, preventing external mechanical vibrations from interfering with the oscillator operation. The substantial mass of the clock module coupled with the high compliance of the Alpha gel pads create a mechanical damping system capable of isolating the critical core of the clock from vibrations of frequencies as low as 15 Hz.
• The T1 10MHz Time Reference can be fitted with the GPS option board. The GPS board enables the T1 to receive a reference signal from the GPS satellite system. Every clock will see its frequency drift over time. In order to maintain the clock frequency as stable as possible, one needs a signal that can be used as the reference which the oscillator can lock onto. The most stable clock available today is the Cesium clock and the best place to it is above our heads, in satellites. The GPS option allows the T1 tot harvest the benefit of the frequency stability of Cesium clocks by locking to the GPS satellite system.

1. Mains switch and power cord receptacle (on back panel)
2. Adjustment shafts and screws
3. Mains filter board
4. Power supply section
5. Main power transformer
6. Standby power transformer (ensures green mode standby)
7. Front panel power supply board
8. Display (on front panel)
9. GPS antenna SMA connector for active or passive 1.57542 GHz antenna. Only when the GPS option is installed.
10. Ethernet RJ-45 plug for control from the Android app
11. USB Type A socket for firmware update
12. TTL level external reference input BNC connector
13. 10 MHz 75 Ohm clock output BNC connectors
14. Output driver board
15. Oscillator module mounted on soft Alpha gel pads (with 4 mechanical stops for transportation purposes)
16. Power supply regulation board
17. User interface push-buttons

Rigorous metal work construction

• The T1 10MHz Time Reference chassis is made of high-grade aluminum alloy with no visible screws on the front, top, and side panels. First-class mechanical and chemical surface treatments provide the luxury finish of the T1. Pin assembly of all chassis elements enables smooth joints between metal parts while screws every 6cm ensure protection against electromagnetic interferences.
• The unit rests on four stainless steel feet. Each foot is fitted with an elastomer ring to sit on delicate surfaces but is also equipped with height-adjustable steel spikes to fine-tune the unit’s position. Horizontal leveling is accomplished using the provided screwdriver through the four adjustment shafts accessible from the top of the unit. Most importantly, the steel spikes serve as vibration evacuation channels. When used with the provided CH Support discs, they create the most effective way to channel unwanted vibrations away from the unit.
• Finally, for units that are stacked on top of each other, stacking covers are provided to interface with the spikes of the unit above (see section 4.2). Vibrations from the upper unit is transmitted by the stacking cover to the shaft of the lower unit and from there to the lower unit’s feet or spikes, forming a privileged path to channel unwanted vibrations away from the unit.

Power supply

• The power supply inside the T1 is highly critical for the effective operation of the oscillator. The T1 power supply consists of three regulation circuits serially connected. They are applied in all the critical areas. This ensures the cleanest and lowest noise power supplies for the oscillator and the output buffer circuits.
• Two toroidal transformers form the AC mains area of the unit. The largest transformer is used to supply power to the local linear regulation circuits described above as well as to the interface of the unit (front panel display, microcontroller, and FPGA devices that monitor the unit).
• The smaller transformer is the Standby transformer to ensure green Standby mode, meeting the latest energy-saving regulations. Both transformers have static shields between primary and secondary windings. They are mounted on a steel plate which is isolated from the rest of the chassis by silent blocks to prevent the transmission of vibrations to the rest of the unit.
• Input AC voltage to the power supply should be set to 100V, 115V, or 230V AC according to your local mains voltage.

System setup examples
Below are two examples of setups that can be realized with the T1. Please note that the T1 can be used with any piece of equipment capable of locking to a 10MHz clock signal.
T1 + D1 + C1 setup

• Both the D1 and C1 need to be equipped with the SYNC_IO option board.
• Connect the T1 BNC output 1 to the D1 SYNC input using a low capacitance 75 Ohms coaxial cable (typically the CH Clock_link Reference cable) and terminate the cable by activating the D1 clock source to Sync BNC 75 Ohm from the D1 menu.
• Connect the T1 BNC output 2 to the C1 SYNC input using a low capacitance 75 Ohms coaxial cable (typically the CH Clock_link Reference cable) and terminate the cable by activating the C1 clock source to Sync BNC 75 Ohm from the C1 menu. Please be aware that as far as clock sources are concerned, each input in the C1 can be configured independently. In this example, the D1 connects to the C1 using the CH Link input. Therefore, the clock source of the C1 CH Link input should be set to Sync BNC 75 Ohm.
• If unused, disable the T1 BNC outputs 3 to 6 in order to minimize electromagnetic radiation.

T1 + I1 setup

• In this setup, the I1 needs to be equipped with the SYNC_IO option board.
• Connect the T1 BNC output 1 to the I1 SYNC input using a low capacitance 75 Ohms coaxial cable (typically the CH Clock_link Reference cable) and terminate the cable by activating the clock source to Sync BNC 75 Ohm from the I1 menu.
• If unused, disable the T1 BNC outputs 2 to 6 in order to minimize electromagnetic radiation.

Read carefully before use
Please read this manual carefully before making connections or operating your T1. After reading this manual, please store it in an accessible place for future reference. If after reading this manual you feel unsure about how to make connections or how to operate the unit, please contact your authorized dealer for assistance.

Package content

Make sure that the package content is complete. If not, please contact your authorized dealer. Your package contains:

• The T1 10MHz Time Reference unit
• A power cord
• 4x adjustment steel spikes
• A suction cup (used to unscrew the top covers)
• An accessory box containing:
  • a spike adjustment screwdriver
  • a Torx 10 screwdriver
  • four stacking covers
  • a USB stick
  • a set of four CH Support Discs

Please store the packaging for future use. Check your T1 for any apparent damage. In case of damage, immediately contact your authorized dealer. If your T1 is cold due to transport, please let it warm up to room temperature before powering it up.

Safety notice

Make sure to observe the following safety rules:

• Always keep the unit horizontal when handling it
• Install your unit on a stable base
• Do not install your T1 near the water
• The T1 is fairly heavy, so have someone to help you when moving it
• Do not expose the unit to any kind of liquid
• Do not install it under direct sunlight or near any heat source such as radiators or other apparatus generating heat
• Do not install it in a confined space and make sure there is sufficient airflow around the unit, including under the unit
• Do not operate under high ambient temperature (>40°C) or in extremely high humidity conditions
• Only use options and accessories specified or recommended by CH Precision
• Do not open the unit nor try to service it by yourself. Always refer to a qualified technician for service, maintenance, or upgrades. Failure to do so will void the unit’s warranty.

Mains supply

Before connecting the mains power cord, make sure that the mains voltage selection at the back of the unit matches your local mains voltage.
Make sure that your T1 10MHz Time Reference is disconnected from the AC wall socket in the following cases:

• When cleaning the unit
• During thunderstorms
• When unused for long periods of time

Also, make sure your T1 is turned off when making connections (it is also highly recommended to turn off the rest of the system).

Transport and packaging

The T1 must always be stored in its original packaging for transportation. Doing so will ensure an optimal level of protection for your unit. Please store all packaging in a dry and clean area for future use.
Besides, we recommend removing the adjustment spikes and storing them in the packaging prior to transportation. Vibrations during transport may cause the adjustment spikes to move from their retracted position; there could be a risk of damaging the piece of furniture the unit is installed onto if the spikes are not fully retracted.
Cleaning
Use a soft, dry cloth to clean your unit. Never use any solvent or liquids as they might damage the surface or infiltrate the unit. Please use an ultra-soft piece of fabric (for example a cloth designed to clean eyeglasses) to clean the front display area.
Maintenance and Servicing
The T1 10MHz Time Reference contains no user-serviceable parts. Do not try to open, modify or repair your T1 by yourself. This will void any warranty. Your T1 10MHz Time Reference must be checked by a qualified and approved technician in any of the following cases:

• The unit is malfunctioning
• The power cord or mains plug at the back of the unit is damaged
• The unit was dropped on the floor or presents external damage
• The T1 has been exposed to liquids or unknown substances

Installation

Unpacking
Unpack your T1 10MHz Time Reference and store the packaging for future reference. The T1 is fairly heavy so have someone to help you when removing it from its packaging.
Unit positioning
When delivered from the factory, the T1 time reference’s four feet sit on elastomer rings, ensuring both scratch protection for the base on which the unit sits, as well as safe anti-slipping unit positioning.
But a more advanced vibration-channeling mechanical coupling can be implemented, thanks to the steel spikes and the polymer support discs provided with the T1. To use this optimal coupling, simply go through the following steps:

1. Place the T1 unit on a stable base at its approximate final position, for instance in your preferred audio rack. Make sure cooling air is able to freely flow around the unit.
2. Gently lift the unit’s corners and insert a support disc under each foot. The foot’s elastomer ring should disappear in the support disc’s groove when properly placed. Carefully check all four feet perfectly fit in each support disc before pursuing any further. The unit should stably rest on its feet at that point.
3. Unscrew the four top covers from the T1’s shafts with the provided suction cup. Be careful not to scratch their delicate finish.
4. Insert the adjustment spikes into each adjustment shaft.
5. Softly screw clockwise each adjustment spikes into the shaft with the provided screwdriver, until any resistance is felt (just before the unit’s corner starts to lift).
6. Then screw clockwise each spike by the same amount (for instance two full turns).
7. If the base is flat, the unit should be stable and horizontal. If not, correct the unit’s stability and horizontality by turning clockwise or anti-clockwise the required spikes.

If no CH Precision unit is to be stacked on top of the T1, screw the four top covers back. Otherwise, screw the four polymer stacking caps instead, and gently lay down the unit to be stacked on top of it. Be very careful that both units are perfectly aligned in order not to scratch the T1’s top plate with the other unit’s feet. Repeat steps 3 to 8.

1. Adjustment shafts. Insert the adjustment spikes and use the provided screwdriver to secure and adjust individual spikes
2. Feet
3. Adjustment spike heads (when inserted into the adjustment shafts)
4. Adjustment spike

Never stack any component other than CHs on your T1. Never use the aluminum shaft covers (top covers) when another CH component is to be stacked on top of your T1.

Connections

This section provides information on how to connect your T1 to the rest of your audio system.

1. 10 MHz 75 Ohm clock output 1 (BNC connectors)
2. 10 MHz 75 Ohm clock output 2 (BNC connectors)
3. 10 MHz 75 Ohm clock output 3 (BNC connectors)
4. 10 MHz 75 Ohm clock output 4 (BNC connectors)
5. 10 MHz 75 Ohm clock output 5 (BNC connectors)
6. 10 MHz 75 Ohm clock output 6 (BNC connectors)
7. TTL level reference input BNC connector
8. USB socket for firmware update
9. Ethernet port to interface with the CH Control app
10. GPS antenna SMA-type connector for active or passive 1.57542 GHz antenna. Only when GPS option is installed.
11. Power fuses and voltage selection
12. Power cord receptacle
13. On/Off power switch

BNC coaxial outputs

• The T1 features 6 configurable 75 Ohm BNC outputs, capable of individually outputting a low or high amplitude sine or square-wave signal. This ensures maximum compatibility with equipment capable of locking on to a 10MHz clock signal.
• The outputs have a 75 Ohm characteristic impedance. For best transmission efficiency, the coaxial cables connected to the T1 outputs should have a 75 Ohm characteristic impedance (typically like the CH Clock_link Reference cable). The unit on the other end of the cable, receiving the T1 clock signal should be terminated with a 75 Ohm load.
• We recommend wiring your system in a point-to-point configuration, whereas one T1 output will connect to one receiver only.
• The outputs are transformer coupled and can be therefore seen as balanced signals.

BNC external reference input

• The T1 features a high-impedance BNC input used to receive an external reference. The input signal must have TTL levels.
• The external reference input accepts specific frequencies: 1PPS (Pulse Per Second), 100kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz and 192kHz. The reference signal frequency maximum deviation should be smaller than ± 0.1ppm around the nominal frequency. Besides, the input signal jitter should be lower than 15 ns pk-pk.
• In order to synchronize the T1 to the external reference input signal, make sure the TRACKER SOURCE is set to EXT IN and the TRACKER STATE is set to ON in the T1’s GENERAL SETTINGS menu. Please refer to Chapter 7.1 for further assistance.

GPS Antenna

• Like every CH Precision option currently available, the GPS synchronization option can either be ordered together with a T1, or added at a later stage. When ordered at the same time as the T1, the GPS module is factory fitted. Otherwise, it will be installed by your authorized dealer.
• The GPS synchronization module is fitted with an SMA connector to connect a passive or an active GPS antenna. An active antenna is provided with CH Precision’s GPS option. Please note that any off-the-shelf 1.57542 GHz GPS antenna (active of passive) fitted with an SMA connector can be used instead.
• In order to synchronize the T1 to the GPS signal, make sure the TRACKER SOURCE is set to GPS and the TRACKER STATE is set to ON in the T1’s GENERAL SETTINGS menu. Please refer to Chapter 7.1 for further assistance.

Ethernet port

• The Ethernet port is used to control the unit settings via the CH Control Android app running on an Android tablet. Simply connect the T1 Ethernet port to a standard Ethernet Router (equipped with a wireless access point so it can communicate with the tablet). Use an Ethernet RJ45 Category 5 or better cable. Using the CH Android app, the T1 settings can be accessed and adjusted on the fly.

Mains socket and voltage selection

• Make sure that the voltage selector at the back of the unit is set to the correct mains voltage with respect to the AC voltage at your location. Connect the power cord to the unit’s main socket and the power cord’s plug to a wall socket.

USB port

• The T1 unit runs a firmware that defines the unit’s operation. The USB port is used to perform updates to the T1 unit’s firmware. The firmware update is carried out via a USB stick containing the latest version of the firmware. The USB Stick is inserted at the back of the unit into the USB port and the update start command is activated via the front panel user interface.
• Please note that the USB port has no other purpose than to update the T1 unit firmware. For more information about unit firmware updates, please refer to section 8 of this manual.

Operation

The T1 10MHz Time Reference is operated either from the unit’s front panel or from a tablet running the CH Control app.

Front panel

• Standby LED
• Five user control push-buttons
• Display area (high-definition display)

The standby LED lights up when the unit is on standby. It is turned off by default during operation and shortly lights up whenever it receives an IR remote control command. The LED can also be programmed to remain ON during operation. The display is a high-definition panel with a very wide viewing angle, high contrast, and high brightness ensuring optimal reading comfort. The color and brightness of the display can be configured according to one’s taste.

Front panel push-buttons
The push buttons located on the front panel of the T1 unit allow the user to access the unit’s settings through a series of menus.

Front panel push-button description
Operating modes
The T1 10MHz Time Reference has three operating modes: Normal mode, Shortcut mode, and Menu mode. Normal mode is used to display the T1 main status whereas Menu mode is used to fully configure the unit. Shortcut mode is designed for quick access to selected Menu mode items. Shortcuts are user-programmable and most Menu mode items can be selected as Shortcuts.

Normal mode

Normal mode is used to display the T1 main status, including the settings of the outputs and whether the T1 is using an external reference signal or is locked to the GPS signal. When powered on, the T1 starts in Normal mode. The display looks as follows:

1. The output frequency of the T1 is always 10 MHz
2. Output (6) waveform shape, which can be sine or square
3. Output (6) waveform shape, which can be low or high
4. External reference clock source if any (GPS or External input), internal otherwise
5. Locking state
6. Output with (1), (2), and (3) specifications

Displayed elements depend on the user settings. In the example above, the T1 is not synchronized to any external clock (internal mode), clock module is stable (the padlock is closed). The first BNC connector outputs a low- amplitude 10.000 MHz sinewave.
The following table shows the actions of the front panel push-buttons in Normal mode.

Front face push buttons| Unit State| Unit Action
---|---|---
, short plush| STANDBY

Any other state

| Wakes from STANDBY No effect
, long push| STANDBY

Any other state

| Wakes from STANDBY Goes to STANDBY
| Any state| Shows the status of the next output
| Any state| Enters Shortcuts mode
| Any state| Shows the status of the previous output
| Any state| No effect

Shortcut Mode

The T1 10MHz Time Reference settings are available through a set of menus described in the next sections. However, to have quick access to the most frequently used configuration menu items, the T1 offers the concept of Shortcuts. Shortcuts are fully programmable and the user may choose almost any configuration parameter as a Shortcut. There are up to six user-programmable Shortcuts available. To learn how to program individual Shortcuts, please refer to the SHORTCUTS menu item in the next section.
Shortcuts are accessed from Normal mode by a push of the OK [ ] button on the front face. Additional OK [ ] pushes go through the remaining Shortcuts. The last Shortcut is always dedicated to entering the Menu mode (SETUP). On this last Shortcut, an OK [ ] push will return to Normal Mode, and a UP [ ] push will enter the Menu mode. The parameters for a given Shortcut are modified using the UP [ ] or DOWN [ ] buttons. The unit reverts to Normal mode if no user action takes place for 10 seconds.
The following table shows the actions of the push buttons in Shortcut mode.

Front face push buttons| Unit State| Unit Action
---|---|---
STANDBY [ ] Long Push| Any state| Goes to STANDBY (power off)
UP [ ]| Shortcuts (except last) Last Shortcut (SETUP)| Modifies parameter up (when available) No action
OK [ ]| Shortcut (except last) Last Shortcut (SETUP) or after the current Shortcut has been modified| Skips to next Shortcut

Exits Shortcuts mode (Normal mode)

DOWN [ ]| Shortcuts (except last) Last Shortcut (SETUP)| Modifies parameter down (when available) Enters Menu mode
CANCEL [ ]| Shortcuts| Exits Shortcuts mode (Normal mode)

Push-button actions for Shortcuts

The COLOR Shortcut gives a good illustration of how to navigate a Shortcut screen. Navigating other Shortcuts is similar.

1. Shortcut title (Parameter being adjusted)
2. Arrow indicating UP button [ ] if applies. The item below indicates the next parameter value (up direction)
3. Next Parameter Value if UP button [ ] is pushed (parameter up)
4. Current Parameter Value
5. Next parameter value if DOWN button [ ] is pushed (parameter down)
6. Arrow indicating DOWN button [ ] if applies. The item below indicates the previous parameter value (down direction)

The last Shortcut (SETUP) is always the same and cannot be removed or altered. It gives access to the Menu mode and the detailed setup of the unit.

1. Shortcut title. It indicates that Detailed Setup (Menu mode) can be entered at this stage
2. The current value of the parameter. The default action is to exit (go back to Normal mode)
3. Arrow indicating UP button [ ]
4. Next parameter value. If the UP button [ ] is pushed, the unit enters into Menu mode.

Menu mode

The Menu mode allows the Configuration and Setup of the T1. Menu mode is entered from the last Shortcut item (see above). From Normal mode, enter the Shortcut mode by pushing the OK [ ] button. By successive OK [ ] button pushes, step to the last Shortcut item (DETAILED SETUP) and push the TOP [ ] button once to enter the Menu mode.
Navigation in Menu mode is based on the UP [ ] and DOWN [ ] buttons to select an item or to change a value. The OK [ ] button is used for validation and CANCEL [ ] is used to go back to the parent level or to exit without saving.

Push-button actions in Menu mode

The following illustration shows the elements of the T1 SETUP Menu page, the entry point of the T1 menu structure.

T1 SETUP screen items

1. Menu title. When entering a menu item, the title also shows the parent menu. If the GENERAL SETTINGS menu is entered, the title line would display T1 SETUP >> GENERAL SETTINGS.
2. Shows the available parameters when entering the currently highlighted menu item. In this example, GENERAL SETTINGS is highlighted and the second column shows the parameters available in the GENERAL SETTINGS menu.
3. The list of items in the current menu. Navigate from one item to the other by pressing the UP [ ] and DOWN [ ] buttons. To enter the highlighted menu item, press the OK [ ] button. To return to the previous menu level press the CANCEL [Q] button. In this example, the CANCEL.
   [ ] button exits the Menu mode and sets the unit back to Normal mode.

Once a menu item is selected by a push of the OK [ ] button, parameters for the corresponding menu item can be navigated and accessed. As an example, the following drawing shows the display elements of the T1 SETUP >> GENERAL SETTINGS sub-menu.

1. Menu title. T1 SETUP >> GENERAL SETTINGS shows that the parent menu is T1 SETUP. By pushing the CANCEL [ ] button, the unit returns to the parent menu.
2. This is the Parameter Value column. For each item in the Parameter column, the Parameter Value item on the same line indicates the current value of the Parameter.
3. This is the Parameter column. The currently active Parameter is highlighted. Use the UP [ ] and DOWN [ ] buttons to navigate from Parameter to Parameter, and the OK [ ] button to enter the edition mode of that parameter.

Once a terminal Parameter (e.g. a Parameter not giving access to a further sub-menu) is selected by pushing the OK [R] button, the T1 displays the corresponding Parameter adjustment screen. The following example shows the GENERAL SETTINGS >> OUTPUT WAVEFORM >> BNC 1 Parameter adjustment screen. Other Parameters are similar but may show more (or fewer) choices for the Parameter value. Once a Parameter is set to the desired value, an OK [ ] button push saves the new Parameter Value and goes back to the parent level (save and exit). On the other hand, a CANCEL [ ] button push goes back to the parent menu (in the case of this example: GENERAL SETTINGS >> OUTPUT WAVEFORM), but any modification of the Parameter Value is discarded (exit without saving).

1. Menu title. OUTPUT WAVEFORM >> BNC 1 shows that the parent menu is OUTPUT WAVEFORM. To access the parent menu, push the CANCEL [ ] button
2. The current Parameter Value is highlighted. Push the UP [ ] or DOWN [ ] buttons to navigate through Parameter Values
3. Other possible Parameter Value(s). The number of other Parameter Value(s) depends on Parameter
4. Parameter for which the Parameter Value can be modified in the current menu.

The T1 menus
Configuration of your T1 is accomplished by setting up parameters in the Menu mode (see Chapter 6 on how to access the Menu mode and how to navigate through menu items).
Please note that configuring your T1 can also be done on a tablet using the CH Control Android app. Please refer to Chapter 5.4 for more information about how to link the T1 to your tablet. Besides, for more information about the CH Control app, please visit our Facebook page (www.facebook.com/chprecision) where you can watch a video describing the main features of the CH app.
There are six main menus used to configure the T1:

• GENERAL SETTINGS: Allows to adjust signal-related parameters, as well as tracking behavior
• DISPLAY SETTINGS: Allows to adjust the front panel display-related parameters
• SHORTCUTS: Allows to assign and modify Shortcuts for user interface customization
• FACTORY SETTINGS: Indicates the software version and allows updating it. Also allows to return to default factory settings
• INSTALLED BOARDS: Indicates which boards are installed
• NETWORK: Provides information about the Ethernet network setup and enables its configuration

GENERAL SETTINGS menu

PARAMETER| PARAMETER VALUES| REQUIRED OPTIONS| REMARKS
---|---|---|---
OUTPUT STATE| Off On| None| Individually selectable for each of the 6 outputs.
OUTPUT WAVEFORM| Square Sine| None| Individually selectable for each of the 6 outputs.
OUTPUT LEVEL| Low High| None| Individually selectable for each of the 6 outputs.
OUTPUT NAME| Any string| None| Used to rename any output in the T1
TRACKER STATE| Off On| None| Synchronize the T1 to an external clock source (on) or run free (off)
TRACKER SOURCE| GPS EXT IN| Only EXT IN is available if the GPS module is not installed| Allows to choose the synchronization source.

DISPLAY SETTINGS menu

PARAMETER| PARAMETER VALUES| REQUIRED OPTIONS| REMARKS
---|---|---|---
DISPLAY MODE| Status Off| None| Selects what to display when the unit is idle for several seconds: General status page or turn off the display.
LED ON/OFF| On Off| None| Allows to select if the front panel LED is on or off when the T1 is on
BRIGHTNESS NORMAL| 10%

20%

… 100%

| None| Sets the display brightness when the unit is operated.
BRIGHTNESS DIMMED| 10%

20%

30%

| None| Sets the display brightness when the unit is left idle for several seconds.
COLOR| Red Green Blue White Yellow Magenta Cyan

Custom color Edit custom color

| None| Selects the color of the displayed texts

Custom color is a user-definable color. To Edit the custom color select the Edit custom color Value. Sub-menus allow individuals to configure Red, Green, and Blue components (RGB) of the custom color.

GAMMA| RBG and global brightness gamma curve correction, +/-30%| None| Fine adjustment of the gamma scale of the RGB components of the display. Allows to have a perfectly dark background and to match other CH Precision unit’s display color, even at low brightness

SHORTCUTS menu

menus or None

| If SHORTCUT 1 is not defined, the Parameter value for SHORTCUT 1 is set to ‘None’. SHORTCUT 2 to 6 are not displayed in this case.
SHORTCUT 2| Most Parameters of the GENERAL SETTINGS and DISPLAY SETTINGS

menus or None

| If SHORTCUT 2 is not defined, the Parameter value for SHORTCUT 2 is set to ‘None’. SHORTCUT 3 to 6 are not displayed in this case.
SHORTCUT 3| Most Parameters of the GENERAL SETTINGS and DISPLAY SETTINGS

menus or None

| If SHORTCUT 3 is not defined, the Parameter value for SHORTCUT 3 is set to ‘None’. SHORTCUT 4 to 6 are not displayed in this case.
---|---|---
SHORTCUT 4| Most Parameters of the GENERAL SETTINGS and DISPLAY SETTINGS

menus or None

| If SHORTCUT 4 is not defined, the Parameter value for SHORTCUT 4 is set to ‘None’. SHORTCUT 5 and 6 are not displayed in this case.
SHORTCUT 5| Most Parameters of the GENERAL SETTINGS and DISPLAY SETTINGS

menus or None

| If SHORTCUT 5 is not defined, the Parameter value for SHORTCUT 5 is set to ‘None’. SHORTCUT 6 is not displayed in this case.
SHORTCUT 6| Most Parameters of the GENERAL SETTINGS and DISPLAY SETTINGS

menus or None

| If SHORTCUT 6 is not defined, the Parameter value for SHORTCUT 6 is set to ‘None’.

FACTORY SETTINGS menu

PARAMETER| RELATED ACTION/VALUE| REQUIRED OPTIONS| REMARKS
---|---|---|---
FIRMWARE VERSION| Firmware version| None| The firmware version indicates the version of the current firmware. The format is x.y. Read-only parameter.
UPDATE FIRMWARE| Update| None| Selecting ‘Update’ launches the T1 firmware update process. A USB flash disc drive with a valid set of firmware must be inserted in the Type A USB port
RESET ALL SETTINGS| Reset| None| Selecting ‘Reset’ returns the T1 to its factory settings.
SERIAL NUMBER| Serial number| None| The serial   number indicates the serial number of the T1. Read-only parameter.

INSTALLED OPTIONS menu

NETWORK menu

PARAMETER| PARAMETER VALUES| REQUIRED OPTIONS| REMARKS
---|---|---|---
STATUS| IP address Product type MAC address| Connection to a router via its RJ-45 Ethernet port| List of CH Precision devices and Android remote controls detected by the T1 (product type, IP, and MAC addresses)

Read Only parameters

ROLE| Offline Online| Connection to a router via its RJ-45 Ethernet port| When physically connected to a network, the T1 can ignore this network (offline) or connect to it (online)
ROOM NUMBER| 1

… 7

| Connection to a router via its RJ-45 Ethernet port| Define the room in which room the T1 is for multiroom applications.

This prevents CH Precision units connected to the same network but located in different systems/rooms to interact with each other.

IP SETTINGS| Auto (DHCP) Direct-Link Manual| Connection to a router via its RJ-45 Ethernet port| Auto should be selected if the T1 is connected to a router with a DHCP server feature.
WAKE-ON-LAN| No

Only if PoE Yes

| Connection to a router via its RJ-45 Ethernet port| If No is selected, the T1 can’t be woken up by the app. Standby mode will consume less than 0.5W. When Only PoE is selected, they can only be wakened by the app if connected to a Power-over-Ethernet switch. Standby mode will draw less than 0.5W from the mains plug.

If Yes is selected, the T1 can always be woken up by the app. Standby mode will draw a couple of watts from the mains plug.

POWER OFF COMMAND| No Yes| Connection to a router via its RJ-45 Ethernet port| When “No” is selected, the T1 ignores “power off” commands received through the network. This is useful as the T1 is meant to remain powered on at all times to reach higher frequency accuracy when tracking a GPS signal.
NETWORK KNOWLEDGE| Clear| None| Clears the T1’s memory of other CH Precision devices it has discovered through the TCP/UDP proprietary protocol.

Firmware update

Preparing the USB Stick

The firmware of all the CH Precision units can be updated using the USB port located at the back of the unit. Before starting the firmware update, it is necessary to load a USB stick with files containing the new firmware. Use a FAT32 formatted USB 2.0 stick. Please note that some USB sticks might not be detected by the T1 USB port. CH Precision recommends the use of Sandisk USB 2.0 sticks such as the one delivered with the unit.
The following procedure describes how to load the USB stick with the correct files:

1. Download the latest T1 firmware file from www.ch-precision.com.
2. Decompress the .zip file and copy the decompressed files to the root of your USB stick. After doing so, your USB stick should contain the following files:

• T1_xxx.ds1
• T1_xxx.mc1
• T1_xxx.ol1

where ‘xxx’ indicates the firmware revision.
Make sure all three files are present at the root of your USB stick. Any missing file will make the firmware update procedure fail.

Updating the unit’s firmware

1. Perform the operations described in section 8.1
2. Connect the USB stick to the USB port located at the back of your T1 unit
3. Navigate to the FACTORY SETTINGS menu (see section 6) and select the UPDATE FIRMWARE item
4. Start the Firmware Update process by pushing the OK (R) button. Please note that the unit will perform a Reset (the display briefly turns off and on) during the procedure
5. Once the firmware update is complete, the unit automatically goes into Standby mode. Remove the USB stick and turn the unit on. The new firmware is now active. To verify that the firmware update is effective, navigate to the FACTORY SETTINGS menu and select the FIRMWARE VERSION item. The displayed firmware revision should match the firmware revision on the files copied to the USB stick.

Note: The firmware update process lasts several minutes, do NOT interrupt it!
When performing a firmware update, do NOT press any of the unit’s front panel push buttons, do NOT unplug the unit from the AC wall socket, and do NOT turn the mains power switch off. Interruption of the firmware update procedure may result in corrupted firmware and a malfunctioning unit. In case something went wrong during a firmware update and the unit malfunctions, apply the emergency firmware update procedure described in the next section.
Emergency firmware update procedure
Perform the following Emergency Firmware Update procedure if your unit doesn’t power up normally.

1. Perform the operations described in section 8.1
2. Power the unit off (back panel mains power switch to OFF)
3. Push and keep the STANDBY (S) button pushed and power up the unit (back panel mains power switch to ON). Keep the STANDBY (S) button pushed for a couple more seconds after you turned the unit on.
4. The unit performs the emergency firmware update. Once the operation is complete, the unit automatically goes into Standby mode. Remove the USB stick and turn the unit on. The new firmware is now active. To verify that the firmware update is effective, navigate to the FACTORY SETTINGS menu and select the FIRMWARE VERSION item. The displayed firmware revision should match the firmware revision on the files copied to the USB stick
5. If the emergency firmware update procedure fails, try the same procedure again using a different USB stick. If the failure persists, turn off your unit and contact your authorized dealer for assistance.

Note: The emergency firmware update procedure lasts several minutes, do NOT interrupt it!

Troubleshooting

Check the power switch at the back of the unit

Check the mains fuses in the AC power cord receptacle

The receiver unit is not locking to the T1| Check that the receiver unit is capable of handling 10MHz clock signals (all the CH digital units are able to receive 10MHz synchronization clocks)

Check that the outputs are turned on (Output State is ON) Experiment with low and high output levels and sine or square-waves

Make sure that the receiver unit has the 75 Ohm termination load activated Try with various 75 Ohm BNC cables

Lost in the settings?| Restore the default factory setting and start your setup again (MAIN MENU → FACTORY SETTINGS → RESET ALL SETTINGS) FACTORY SETTINGS → FACTORY SETTINGS → RESET ALL SETTINGS) RESET ALL SETTINGS)
Firmware update fails| Perform the emergency software update procedure
USB stick for firmware update is not detected| Try another brand of USB 2.0 stick. CH Precision recommends the use of Sandisk USB 2.0 sticks

If the problem persists, disconnect the unit from the AC wall socket and from the rest of your system and contact your authorized dealer for assistance.

Specifications

General

User control| Front panel push-buttons and/or CH Control Android app
Display| 480 × 272 24bits RGB AMOLED
Power supply| Selectable 100V, 115V or 230V AC, 47Hz to 63Hz
Power consumption (Standby)| < 1W
Power consumption (Normal operation)| Max 60 Watts
Operating conditions| Temperature: +5C to +35C, humidity: 5% to 85% (no condensation)
Dimensions (W x D x H)| 440mm x 440mm x 120mm (main body)

440mm x 480mm x 133mm (overall including connectors and feet)

Weight| 20kg
Firmware update / Control| USB port for firmware update / Ethernet-based system control
75 Ohm BNC outputs
Absolute frequency| 10MHz
Frequency accuracy| ± 0.05ppm, stand-alone mode
± 0.001ppm, with the GPS option locked for 1 hour
Shape| sine-wave / square-wave
Peak to peak levels (loaded with 75 Ohms)| Low level setting: 500mV; high level setting: 1V
High impedance reference BNC input
Input Level| 5V TTL
Input impedance| 47 kOhm
Accepted reference signal frequencies| 1PPS, 100kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz and 192kHz
Reference signal frequency maximum deviation| ± 0.1ppm around the above the reference signal frequencies

Design and Specifications are subject to change without notice. Weight and dimensions are approximate Illustrations are informative only and may differ from the actual product model Enclosure designed by Mana Ishoni.

FCC STATMENT

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• adjust or relocate the receiving antenna
• increase the separation between the equipment and the receiver
• connect the equipment to a mains outlet on a circuit different from that to which the receiver is connected
• consult the dealer or an experienced radio/TV technician for help

Disposal – Environmental care

Directive 2002/96/EG of the European Parliament requires consumer electro- technical appliances to be disposed of separately and have to be indicated with the following symbol. Should you dispose of this component please do so in conformity with local and global legal and environmental regulations and according to best practices. We strongly encourage you to recycle any batteries used with this component.

References

• CH Precision | Reference grade components
• CH Precision | Reference grade components

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