Tektronix P6056 Oscilloscope Probe Instruction Manual

: June 4, 2024
: Tektronix

Table of Contents

WARRANTY
PROBE AND ACCESSORIES
CHARACTERISTICS
SPECIFICATIONS
OPERATING INSTRUCTIONS
COMPENSATION AND MAINTENANCE
ELECTRICAL PARTS LIST
MECHANICAL PARTS LIST
Read User Manual Online (PDF format)
Download This Manual (PDF format)

P6056 / P6057
PROBE
010-6056-03
INSTRUCTION MANUAL

WARRANTY

All Tektronix instruments are warranted against defective materials and workmanship for one year.
Any questions with respect to the warranty, mentioned above, should be taken up with your Tektronix Field Engineer or representative.
All requests for repairs and replacement parts should be directed to the Tektronix Field Office or representative in your area. This procedure will assure you the fastest possible service. Please include the instrument Type (or Part Number) and Serial or Model Number with all requests for parts or service.
Specifications and price change privileges reserved.
Copyright ©) 1971 by Tektronix, Inc., Beaverton, Oregon. Printed in the United States of America. All rights reserved. Contents of this publication may not be reproduced in any form without permission of the copyright owner.
U.S.A. and foreign Tektronix products covered by U.S. and foreign patents and/or patents pending.

Fig. 1. P6056/P6057 probe with standard accessories.

PROBE AND ACCESSORIES

P6056/P6057 PROBE

CHARACTERISTICS

General Information
The P6056 (10X), and P6057 (100X), are miniature, fast-rise, low input- capacitance probes with relatively constant input resistance over a wide range of frequencies, designed for use with 50 {2 wide-band oscilloscopes such as the Tektronix 7904 with 7A19 plug-in installed.
Cable length for each probe is selected for calibrated signal delay.
These probes can also be used with sampling systems by utilizing appropriate adapters.
Both probes are equipped with a special BNC connector that provides trace identify and digital readout information when used with plug-in units or mainframes that have these features. A button on the Trace Shift Sleeve portion of the probe body provides the trace identify function.

SPECIFICATIONS

Electrical characteristics are applicable when used with an instrument that is calibrated within an ambient temperature between +20°C and +30°C. Unless otherwise stated, electrical characteristics apply over an operating temperature range from —15 C to +55°C, and to an altitude of 15,000 feet.

NOTE
The following electrical specifications apply when the probe is operating into a 50 {2 oscilloscope input or a 50 92 termination.

Electrical

Attenuation:
(Includes +2% Input Resistance of
Oscilloscope)| P6056, 10X within 3%. P6057, 100X within 3%.
---|---
Input Resistance: (Within 3%)| P6056; 500 S2 DC to 300 MHz,
decreasing to 250 S-2 at 1 GHz.
P6057; 5000 2 DC to 350 MHz, decreasing to 1500 SZ at 1 GHz.
Input Capacitance:| P6056 and P6057: Approximately 1 pF.
Risetime:| P6056; 100 ps (probe only). P6057; 250 ps (probe only).
Bandwidth (-3 dB): (Calculated from Risetime)| P6056; DC to 3.5 GHz (probe only), DC to approximately
500 MHz with 7A19 and 7904.
P6057; DC to 1.4 GHz (probe only), DC to approximately
480 MHz with 7A19 and 7904.
Maximum Input Voltage: (Limited by 0.5 W nose resistor dissipation, and derated with frequency)| P6056; 16 V DC or RMS (AC or pulse) to 800 MHz, decreasing to 9 V at 1 GHz.
P6057; 50 V DC or RMS (AC or pulse) to 500 MHz, decreasing to 21 V at 1 GHz.
Signal Delay Time:| P6056 and P6057; 8.2 ns (6 ft probe), 12.3 ns (9 ft probe), each
within 35 ps.

General

Weight:| 6 ft. probe-2 ounces, 9 ft. probe-3 ounces (complete with accessories, except Instruction Manual). Shipping: 6 ft. probe-12 ounces, 9 ft.
probe-13 ounces.
---|---
Dimensions:| Nominally 6 ft. and 9 ft. long (Calibrated for signal delay time).
Environmental:| Probe will operate within specifications over the following ranges:
Temperature—From —15°C to +55°C.
Altitude—To 15,000 feet.

OPERATING INSTRUCTIONS

Handling
The P6056/P6057 tip is physically connected to the nose resistor. Bending, or excessive pressure on the tip may damage the resistor. Where reactive considerations permit the use of the hook tip or the bayonet ground adapter, these devices will help protect the probe tip. When the probe is not being used, the probe test tip 015-0201-00 should be installed for tip protection. Refer to the maintenance portion of this manual for nose resistor replacement-
ment information.
Soldering components to the tip can break the bond between the tip and the internal resistor. If a self-holding tip connection is required, use a pin contact taken from a small transistor socket.
Avoid kinks, sharp bends, and dents in the probe cable, as any of these can cause a reflective discontinuity in the probe response.

Probe Tip Connections
All signal and ground leads should be kept as short as possible, due to inductive effects that can cause ringing at high frequencies. A good way to make the probe connections is to touch the tip and ground sleeve directly to the appropriate points in the test circuit or through the bayonet ground adapter. When the ground connection Cannot be made in this manner, attach a ground contact spring, Tektronix Part No. 214-0283-00, to the sleeve. If necessary, a short stub of wire can be soldered to the contact spring, to extend the ground connection.
If the signal originates from an instrument (such as a pulse generator) that has a coaxial output connector, use a probe-tip adapter (Tektronix Part No. 013-0084-01 for BNC: 017-0076-00 for GR) for the connection. This provides a correct environment for the signal and eliminates noise or other external electromagnetic interference signals.
The hook tip can be used in most measurements without adverse effects on the display since the small series inductance it presents is insignificant except at very high frequencies. The ground-strap assembly acts as a much larger series inductor. Its effect on the display may be noticable with pulse rise times faster than about 0.6 or 0.7 nanosecond.

1 Measurement Concept Booklet; Probe Measurements, Tektronix Part No. 062-1120-00 includes detailed measurement techniques.

Use with 50 Ohm Input Oscilloscopes

These probes are designed to work directly into 50-ohm wide-band oscilloscopes. No termination is necessary, and Auto Scale Factor Readout- equipped oscilloscopes will indicate the correct deflection factor for the signal that appears at the probe tip. Specifications and derating information listed will apply when the probes are used in this manner. For 502. systems using other than BNC connectors, an appropriate adapter will be required between the probe connector and the system input.

Use With High-Resistance Input Oscilloscopes
The P6056 and P6057 must be terminated in 50 ohms. For oscilloscopes or plug- ins with a high resistance input, a 50-ohm termination such as the Tektronix Part No. 011-0049-01 must be attached between the probe and the oscilloscope input. (see note after ‘‘Readout and Trace Identify’’.)
There will be a slight signal reflection in the system appearing at 2X the cable delay time. This reflection is due to the shunt capacitance of the oscilloscope in parallel with the 50-ohm termination. To reduce the effects of this reflection, add a 2X attenuator, such as the Tektronix Part No. 011-0069-01, between the probe connector and the 50-ohm termination. This will decrease the reflection percentage by a factor of four while increasing the attenuation by a factor of two. For sine wave measurements, the 2X attenuator is recommended to minimize standing waves.

Readout and Trace Identify
When connected to oscilloscope systems with Auto Scale Factor Readout circuitry, a resistor in the probe provides information to retain correct deflection factor readout, including probe attenuation.

NOTE
Readout and Trace Identify functions will be inoperative whenever a termination, attenuator, or adapter is inserted between the probe connector and the oscilloscope or plug-in input.

Probe Tip to GR 50 Ω Termination Adapter
This adapter, Tektronix Part Number 017-0088-00, provides a means of terminating a 50-ohm system while measuring the system voltage at the special probe tip receptacle.
Since the terminating resistor and the 50-ohm line are in parallel as seen by the probe tip, the effective source impedance for the probe will be 25 ohms.

Maximum Voltage and Power Input
The basic power rating of these probes at DC is 0.5 watt.
The related DC input voltage for each probe is listed in Specifications.
Selecting the AC coupling mode in a 50-ohm oscilloscope system, or using an external coupling capacitor, will block DC current flow in the probe. When an external termination is used with a high-resistance input oscilloscope system, selecting the AC coupling mode will not block DC current flow through the termination. Use of the AC coupling mode or an external coupling capacitor will result in some. sacrifice of the total system low-frequency response. At high frequencies, the voltage derating listed in Specifications will apply.
The RMS voltage of a pulse signal should, if possible, be estimated before measurement. The pulse duration, duty factor, and DC level determine the RMS signal voltage. Above 500 MHz for the P6057 and 800 MHz for the P6056, the power dissipation capability of the probe is derated below 0.5 watt as indicated in Specifications “‘Maximum Input Voltage’’.
Pulse peak voltages up to 500 volts may be measured with these probes, provided the RMS probe-input voltage is no greater than the DC maximum input voltages listed in Specifications. In no case should any portion of the signal exceed the DC input rating listed in Specifications for longer than 1 millisecond.

COMPENSATION AND MAINTENANCE

General
The P6056 and P6057 consist of several subassemblies as illustrated at the back of this manual. Repair techniques are discussed at the end of this topic.
The probes are factory compensated and normally will not require adjustment unless the setting of the compensation is disturbed. The compensation should be checked when either the probe body, nose resistor, or adjustment assembly is replaced, and whenever the adjustment has been
disturbed.
Compensation equalizes the high and low frequency probe attenuation factors. This is accomplished by passing a fast-rise, flat-top pulse through the probe from a low-impedance source, and adjusting the Cjp so an oscilloscope display indicates proper probe response.
The following list of equipment or its equivalent is required to perform accurate compensation. Specifications are minimum requirements, and substitute equipment must meet or exceed these minimum specifications. All equipment must be in a calibrated condition and comply with rated specifications. Observe warmup requirements and operating conditions as stated in the instruction manual for each item of test equipment.

Equipment Required

Test oscilloscope system. Vertical deflection factor 10 mV/division at 5OO MHz, sweep time 5 ns/division. Tektronix 7904 with a 7A19 and a 7B92 plug-in or equivalent.
Pulse Generator. Pulse risetime 0.25 ns, amplitude 10 volts peak, duration approximately 10 ns. Tektronix Type 109 or equivalent.
Charge network or charge line. 5 ns, 50 92. Tektronix 017-0067-00 network or 017-0502-00 cable. (Both items included as standard accessory with Type 109.)
Attenuator. 5092 10X, GR. Tektronix 017-0078-00 or equivalent. (One required for P6056, two required for P6057).
Cable, connecting. GR 5 ns, Tektronix 017-0502-00. (Included as standard accessory with Type 109.)
Adapter, Probe Tip to GR, 5092 Terminating. Tektronix 017-0088-00.
Adapter, GR-to-BNC male. Tektronix 017-0064-00.

Compensation Procedure

Connect the equipment as shown in Fig. 2A.
Set the test oscilloscope Volts/Div to 10mV, and Time/Div to 1 ns.
Adjust the pulse generator to produce 5 divisions of oscilloscope deflection (about 1 volt of generator output for the P6056, and 10 volts for the P6057). Adjust the oscilloscope triggering controls for a stable display.
Note this display carefully, as it will be the reference for proper probe compensation.
Remove the cable, attenuator(s), and adapter from the pulse generator and oscilloscope (leave the charge network or line connected to the 109).
Connect the probe and Probe Tip to GR 502 Terminating Adapter as shown in Fig. 2B.
Compare the leading edge and front corner of the signal display with the waveform obtained in step 4.
Fig. 2. Equipment setup for compensating the P6056 and P6057
If step 7 shows that compensation is required, proceed as follows:

a. Grasp the Trace shift sleeve and hold it stationary while rotating the front Probe Body in a clockwise (as viewed from rear of probe) direction to unlock the compensation.
b. Connect the probe to the 109 through the adapter as in step 7.
c. Rotate the front body assembly either direction as necessary to match the waveform obtained in step 4 (back the Trace Shift Sleeve away from the front Probe Body if necessary to achieve more range).
d. When the closest possible match to the waveform of step 4 has been obtained, carefully hold the front Probe Body assembly stationary while rotating the Trace Shift Sleeve in a clockwise (viewed from rear) direction to lock the compensation.

Maintenance
Refer to the Mechanical Parts List and exploded view at the back of this manual.
Fig. 3 illustrates nose resistor (item 5) replacement procedure. The plastic pressure nut (item 6) may be damaged if subjected to excessive torque. Tighten only enough for a snug fit against the resistor.
Cable length is critical. Do not shorten it as delay time specification will be altered.
Unless otherwise noted, parts that are separately listed in the Mechanical Parts List may be replaced individually.