HTC INSTRUMENT HT127AB Smart Digital Multimeter User Manual

USERS MANUAL
SMART
DIGITAL MULTIMETER

Before using the instrument, please read this manual L.D carefully, and save it well for future use.

Safety Statement

Caution:
the operation that may cause damage to the meter or equipment.
  “Warning”:
the operation that may cause danger to users. Safety Instructions The meter conforms to IEC61010-1 CAT.Ill 600V overvoltage safety standard and pollution level 2.
Safety specification
Warning
To avoid possible electric shock or personal injury, please observe the following specifications:

• Please read this manual carefully
• and pay special attention to safety warning information before using the meter.
• Operate the meter according to the manual, otherwise, the protection function provided by the instrument may be damaged or weakened.
• Take special care when measuring values that exceed 60VDC, 30vac RMS, or 42V. This kind of voltage has the danger of electric shock.
• Do not measure a voltage higher than the rated value between terminals or between terminals and ground.
• Measure the known voltage to check whether the meter works normally.
• If it is not normal or damaged, please do not use it again.
• Before using the meter, please check whether there are cracks or damaged plastic parts in the instrument shell. If so, please do not use it again.
• Before using the meter, please check whether the probe is cracked or damaged. If so, please replace the probe with the same model and the same electrical specification.
• Please use the meter according to the measurement category, voltage, or current rating specified in the meter or manual.
• Please observe local and national safety regulations. Wear personal protective equipment (such as approved rubber gloves, masks, flame retardant clothing, etc.) to prevent injury caused by electric shock and electric arc when dangerous live conductors are exposed.
• When the fl symbol is displayed on the meter, please replace the battery in time to prevent measurement error.
• Do not use the meter in an environment with explosive gas or steam or a  humid environment.
• When using the probe, please hold your fingers behind the probe finger guard.
• When measuring, please connect the null or ground wire first, then the live wire; when disconnected, please disconnect the live wire first, and then the null or ground wire.
• Remove the probe from the meter before opening the case or battery cover. Do not use the meter when the meter is disassembled or the battery cover is opened.
• The meter can only be used together with the probe provided to meet the requirements of the safety standard. If the probe is damaged and needs to be replaced, the probe of the same model and electrical specification must be replaced.

Overview

This meter is an intelligent true RMS digital multimeter. It has an intelligent and professional measurement function.  Full function, with gear display, analog bar multiple displays.

Power on / off
Press and hold the” ( key for about 2 seconds to turn it on or off.
Gear selection
Press the key to manual mode;
Press me key again to select the gear to the left or right ; press the” El “key to return to the intelligent (AUTO) measurement mode. Power on is in intelligent measurement mode by default.
Data hold
Press the key to turn on or off the data holding.
Flashlight
Press and hoa ey tor about 2 seconds to turn on or off the flashlight.
Backlight
Press the key to turn on or off the backlight.

Note: VA display does not have his function

Warning of a fuse burning out

If the fuse is burnt out, the symbol will be displayed. When the current gear is selected, the symbol LISE will be displayed at the same time. It is not allowed to measure the current. Please replace the fuse in time.
Input jack indicator
When the gear is changed, the corresponding input light will flash for 5 times to prompt to insert the probe into the corresponding jack.
Automatic current identification function
When the A jack is inserted into the probe, the meter will automatically jump to the gear and enter the current measurement function
Auto power off
After power on, auto power off will be on by default and the symbol will be displayed. Without any key operation in about 15 minutes, the meter will automatically shut down to save battery energy. Press and hold key to turn on the meter, and the auto power-off function will be canceled. The symbol is not displayed.

Measurement operation

Warning

• Do not measure the voltage higher than 600V; otherwise, the meter may be damaged.
• Pay special attention to safety when measuring high voltage to avoid electric shock or personal injury.
• Before use, test the known voltage with the meter to confirm that the meter is in good condition.

Smart (AUTO) measurement

This measurement mode is the default when power on. In this mode, DC voltage, AC voltage, resistance, and continuity can be measured, and the meter can automatically identify the measurement signal.

1.  Press the key to power on, display Hut a, and enter the intelligent measurement mode.
2.  Insert the red probe into the  jack and the black probe into the “ COM ” jack.
3. Contact the probe of the probe with both ends of the measured power supply or resistance (parallel), and the meter will automatically recognize the measured signal.
4. When measuring the resistance, the resistance value is less than about 50 0 The buzzer sounds and the indicator light is on.
5. Read the results from the display.

NOTE : The minimum measurable voltage of this mode: is 0.8V Professional measurement
AC/DC voltage measurement

1.  Press the key to power on, display Hut a    and enter the intelligent measurement mode.
2. Press key to select gear.
3. Press the key to select AC voltage or DC voltage. Display AC ” the symbol is AC voltage; Display PC” the symbol is the DC voltage.
4. Insert the red probe into the jack and the black probe into the “ COM ” jack.
5. Contact the probe with both ends of the measured power supply (parallel).
6. Read the results from the display.

Resistance measurement

1. 1. Press the key to power on, display Hut a and enter the intelligent measurement mode.

2. Press the key to select” Ω” gear.
3. Insert the red probe into jack and the black probe into the “COM” jack.
4. Contact the probe with both ends of the measured resistance (parallel).
5. Read the results from the display.

Continuity test

1.  Press  key to power on, display and  enter the intelligent measurement mode.
2. Press key to select “)”gear.
3. Insert the red probe into jack and the black probe into the” COM ” jack.
4. Contact the probe with both ends of the measured resistance or Circuit(parallel).
5. When the resistance value is less than about 50 Ω The buzzer sounds and the indicator light is on.
6. Read the results from the display.

Frequency/Duty measurement

1. Press the key to power on, display , and enter the intelligent measurement mode.
2.  Press the key to select “w gear.
3.  Insert the red probe into the jack and the black probe into the COM jack.
4.  Contact the probe with both ends of the measured power supply
5. Read the results from the display.

Capacitance measurement

1. Press key to power on, display , and enter the intelligent measurement mode.
   

2. Press key to select gear.

3. Insert the red probe into the jack and the black probe into the COM jack.

4. Contact the probe with both ends of the measured capacitance(parallel).

5. Read the results from the display.

Diode test

1. Pressley to power on, display , and enter the intelligent

2. Press the key to select gear. Insert the red probe into jack and the black probe into the COM jack.

3. The red probe contacts the anode of the diode and the black probe contacts the cathode of the diode.If the probe polarity is opposite to the diode polarity, the display will
   display “OL”.

4. Read the results from the display.

Temperature measurement

1. Pressley to power on, display enters the intelligent measurement mode.
2. Press the key to select tie” gear.
3. Insert the positive pole of the K-type thermocouple into the” and the negative pole into the COMjack.
4. The thermocouple probe contacts the measured object.
5.  Read the results from the display.

Non-contact AC voltage detection

1. Pressley to power on, display , and enter the intelligent measurement mode.
2. Press the key to select gear. Display the “ NCV ” symbol.
3.  The NCV sensor area is gradually close to the conductor.
4. When the weak electric field signal is detected, it will display ; the buzzer will sound slow and the green light is on.
5. When the strong electric field signal is detected, it will display ; the buzzer will sound quickly, and the red light on.

Live wire detecting

1. Press key to power on, display and enter the intelligent measurement mode.
2. Press the key to select gear. Press the key to display the symbol.
3. Insert the red probe into the jack and remove the black probe.
4. Use the red probe to contact the conductor.
5. When the weak electric field signals are detected, it will display the buzzer will sound slow and the green light on.
6. When the strong electric field signal is detected, it will display ; the buzzer will sound quickly and their light on.

AC/DC current measurement

1. Press key to power on, display , and enter the intelligent measurement mode.
2. Press key to select gear. Or insert the red probe into the A jack to automatically select the gear.
3.  Display the “ DC ” symbol is    DC current measurement ; press display the “C” symbol as AC current measurement.
4. Insert the red probe into the A jack and the black probe into the COM jack.
5. Disconnect the measured power supply, connect the meter in series with the power supply, and then turn on the measured power supply.
6. Read the results from the display.

Caution
Do not measure current greater than 1 0A, otherwise, the fuse will be burnt out General Technical Specifications

• Environment condition of using: CAT. III 600V.Pollution level 2, Altitude < 2000m Working temperature and humidity: O~4O°C(<80% RH, <10’C non condensing)
  Storage temperature and humidity: -10-60°C(<70% RH, remove the battery)

• Temperature coefficient: 0.1x accuracy/°C(<18°C or >28°0).

• MAX. The voltage between terminals and earth ground: DC/AC 600V

• Fuse protection: F10A/250V fuse

• Sampling rate: approx. 3 times/second.

• Display: 6000 counts

• Over range indication: “ OL “.

• A low battery indication: will be displayed.

• Input polarity indication: display”-“.

• Power requirement: 4 x 1.5V AAA batteries.

Accuracy Specifications

The accuracy applies within one year after the calibration. Reference condition: the environment temperature 18°C to 28°C, the relative humidity is no more than 80%,

DC voltage

AC voltage

Impedance : Approx.10MQ Frequency Response: 40Hz~1 kHz; TRMS

Resistance

Overload protection: 250V

AC/DC current

Overload protection:F10A/250V fuse Frequency Response:40Hz~1kHz; TRMS

Capacitance

Overload protection: 250V

Frequency/Duty

Overload protection: 250V

Diode/ Continuity

| Display diode voltage drop
---|---
| Approx. 500, Buzzer will sound
and the indicator light will be on.

Temperature

Resolution: fC/HF
Note : use a K-type thermocouple probe

**Maintenance

**

Clean
When cleaning the meter, please follow the following steps:

1. Turn off the meter power and remove the probes.
2. Wipe the case with a damp cloth or mild detergent. Do not use abrasives or solvents. Wipe the contacts in each input socket with a clean swab soaked in alcohol.
   

Warning
Always keep the inside of the meter clean and dry to prevent electric shock or damage to the meter. Replace battery

1. Turn off the meter power and remove the probes.

2. Remove the screw fixfrom damaging the product.
   Replace the fuse on the battery cover and remove the battery cover.

3. Remove the old battery and replace it with a new one of the same specification. Please pay attention to the battery polarity.

4. Install the battery cover back to its original position, and fix and lock the battery cover with screws.

Warning

• To avoid electric shock or personal injury caused by wrong reading, please replace the battery immediately when the battery is low. Do not discharge the battery by shorting it or reversing its polarity.
• To operate and maintain the meter safely, please take out the battery when it is not used for a long time to prevent the battery leakage from damaging the product.

Replace fuse

1. Turn off the meter power and remove the probes.
2. Remove the screw fix the back cover and remove the back cover.
3. Remove the burnt-out fuse, replace it with a new one of the same specification, and ensure that the fuse is installed in the safety clip and clamped tightly.
4. Install the back cover and fix it with screws.

Warning
After opening the back cover of the meter, do not use the instrument for measurement to prevent electric shock or damage to the instrument

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