HTC INSTRUMENT CM-2046 Digital AC-DC Clamp Meter User Manual

CM-2046 Digital AC-DC Clamp Meter
User Manual

SUMMARY

This 31/2 Digit Highly Stable clamp meter uses two AAA (1.5V) batteries. It has an LCD with a 20 mm digit display, which makes the reading clearer and the operation more convenient. It can test DCV, ACV, DCA, ACA, resistance, temperature, diode, continuity, as well as non-contact AC voltage test. It is equipped with clamp jaw lighting, Backlight, unit symbol display, True RMS, MAX, MIN, data hold function, auto power off, and warning functions. It works in both auto range and manual range. To assure high accuracy and resolution, it adopts a microprocessor that drives the LCD directly and a dual integral AID converter IC. It is an ideal tool for labs, factories radio-technology, and households.

SAFETY NOTICE

The instrument is designed according to the IEC1010 standard (safety standard issued by the International Electrotechnical Committee). Please read the following carefully before the operation.

1. Check the connection and insulation of test leads to avoid electric shock.
2. To avoid electric shock and damage to the meter, do not input voltage higher than DC 1000V or AC 750V during measurement.
3. Be seriously cautious when working with voltages above DC 60V or AC 36V
4. Select the correct function and range to avoid shock and fault operation.
5. Please move the test leads away from test points when switching the range.
6. Please don’t input voltage in the current terminal.
7. Please don’t change the circuit randomly to avoid damaging the meter and danger.
8. Introduction for safety symbols:
   “ ” Existing High Voltage,  “ ” GM) “ ” Dual Insulation, ” ” Operator must refer to the manual, Low battery indication.

FEATURES

1. General Features
   (1) Display: LCD.
   (2) Max display: 2,000 (3 1/2 digits, auto polarity, and unit symbol display).
   (3) Measurement method: Analog to digital converter (in microprocessor ADC+MCU).
   (4) Sampling rate: approx.3 times/sec.
   (5) Over-range display: “OL.” displayed.
   (6) Low battery indicator: Crdisplayed.
   (7) Working environment: (0 ˜40)°C , relative humidity: <80%.
   (8) Store condition: (-10 –50)°C , relative humidity: <80%.
   (9) Power: 2 X 1.5V batteries (AAA).
   (10) Dimension: 270mmx123nunx35nun (length x width x height).
   (11) Clamp open: Max. Open: 52mm.
   (12) Weight: approx. 280g (including battery).
   (13) Accessories: user manual, test leads, temperature sensor TPOI banana probe, black pouch, gift box, two 1.5V AAA batteries.

 Technical Features

1. Accuracy: ± (a% x reading data + digits). To assure accuracy, the environment temperature should be (23±5) °C , relative humidity be <75%. One year accuracy guarantee from the production date.
2. DC Voltage (DCV)
   Range| Accuracy| Resolution
   ---|---|---
   200mV| ± (1.0%+5)| 0.1 mV
   2V| ± (0.5%+5)| 1 mV
   20V| 10 mV
   200V| 100 mV
   1000V| ± (1.0%+5)| 1V

Input impedance: at 200mV range >soma, at other ranges is 40MΩ. Overload protection: 1000Vrms.

3. AC Voltage (ACV)
   Range| Accuracy| Resolution
   ---|---|---
   2V| ± (1.0%+5)| lmV
   20V| 10mV
   200V| 100mV
   750V| ± (1.5%+5)| 1V

Input impedance: 10MΩ.
Overload protection: 1000Vrms.
Frequency response: 750V at 40Hz-11cHz, other ranges 40Hz-2kHz.
Display: True Rms Response (calibration based on Sine Wave RMS).

4. DC Current (DCA)
   Range| Accuracy| Resolution
   ---|---|---
   20A| ± (2.0%+5)| 10mA
   200A| 100mA
   1000A| 1 A

Overload protection: 1200A (input time <60 seconds).
NOTE: Clear to zero before measurement, The testing object shall be placed in the middle of the clamp jaw.

5.  AC Current (ACA)
   Range| Accuracy| Resolution
   ---|---|---
   20A| ± (2.0%+5)| 10mA
   200A| 100mA
   1000A| 1A

Frequency response: Since Wave and Triangular Wave are 40Hz-1IcHz, Others is 40Hz-2kHz. Overload protection: 1200A ( Do not input more than 60 seconds) Attention : The target Current Conductor should be placed in the middle of the Clamps.

6. Resistance (Ω)
   Range| Accuracy| Resolution
   ---|---|---
   200Ω| 1 (0.8%+5)| 0.1Ω
   2kΩ| ± (0.8%+1)| 1Ω
   20kΩ| 10Ω
   200kΩ| 100Ω
   2MΩ| lkΩ
   20MΩ| ± (1.2%+5)| 10kΩ

Open-circuit Voltage: 500mV, Overload protection: 250Vrms.
NOTE : DO NOT input any voltage value at this range!

7. Diode and Continuity Test
   Range| Description| Test Conditions
   ---|---|---
   | Diode forward voltage drop| Forward DC current is approx 0.8mA, reverse voltage is approx 2.2V.
   | When the resistance under test is less than 5012, the buzzer sounds continuous.| Open circuit voltage: 2V

Overload protection: 250Vrms.
WARNING : Do not apply any voltage at this range.

8.  Temperature (°C/°F)
   Range| Accuracy| Resolution
   ---|---|---
   -40°C-1000°C| <400°C: ± (1.0%+5)

   400°C : ± (l.5%+15)| 1°C
   -40°F-1832T| <750°F: ± (1.0%+5)
   750°F: ± (1.5%+15)| °F

Thermocouple: K type (Nickel-chromium-Nickel silicon).
WARNING : Do not apply any voltage at this range!

OPERATION

4.1 Panel Description

1. Jaw: 0 to 1000A AC/DC current and NCV detecting device.

2. Hand protection: A safe design to protect users from touching dangerous areas.

3. Clamp gunlock: Pressing the gunlock can turn the on or off the clamp.

4. Clamp light: Opening the clamp light can light up the tested area in the dark to prevent danger.

5. NCV indicator: Detect the existence of the high voltage around to prevent the electric shock.

6. HOLD/  button: Data Hold function: Press this key to enter HOLD mode. The current value will behold, and a symbol
   H will be displayed; Press this key again to exit the HOLD mode.
    Backlight display function: Backlight control key, press it for more than 2 minutes to turn on the Backlight (it will be shown on LCD) then press it for more than 2 minutes again to make it off. The backlight function will be off automatically when you release the backlight control key after 30 minutes.

7.  Function choosing switch: Used to select the function, range, or turn on or turn off the clamp meter.
   Switch position| Function
   ---|---
   | AC and DC current measurement
   | AC and DC voltage measurement
   NCV| Non-contact voltage detect
   Ω| Resistance measurement
   | Diode/Continuity measurement.
   °C/°F| Temperature measurement.

8. Function buttons:

MAX/MIN key:
After pressing this key, the A / D converter continues to work, and the display value is always updated and the maximum or minimum value is retained; Press for more than 2 seconds, will release the maximum /minimum data hold mode.
RANGE/REL key:

1. In voltage and resistance measurements, it is the RANGE function, to choose from an auto range or manual range. The meter is defaulted in auto range. The symbol “AUTO” appears on the LCD. Press this key one time to switch to the manual range. Press it again one time to increase on a step from low to high. Press it for more than two seconds to return to the AUTO range.
2.  In  measurements, it is REL function. Press this key to clear “of readying” and enter relative value measurement. REL symbol will appear on the LCD. Press this key again to exit the REL measurement. In if the displayed does not return to zero before measurement, press this key to return to zero before measurement.

SELECT / key:

1. This is a key for Selecting function, based on a working principle of Trigger action. Short press this key to choose measurement modes: Choose DC or AC at ” “, choose “ → ” at “ “, and choose “°C” or “,” when at Temperature range.
2.  The Meter will be Auto power off when it is not being used within 15 minutes, then it will be entering into sleeping mode, the Buzzer will make 5 times of alarm reminders within 1 minute before Auto-power off; Please press this “SELECT’ function or Power on/off button to turn on the Power if you want to restart it
3. Press this key and put it on Hold and then turn on the Power to wake it from sleeping mode, and then Auto-power off function will be canceled.
4. Illuminating lamp control key, press it for more than 2 minutes to turn on Illuminating lamp, and then press it for more than 2 minutes again to make it off. LCD display: Displaying the measurement value and unit.
   Item| Function| Description
   ---|---|---
   1| APO| Auto power-off function has been activated.
   2| | Low battery indication. Warning: To avoid error readings, which could lead to possible electric shock or personal injury, please replace the battery in time.
   3| –| Indicates negative readings.
   4| AC| AC voltage or current measurement.
   5| DC| DC voltage or current measurement.
   6| AUTO| Auto-ranging mode
   7| | Diode test.
   8| | The continuity beeper is on.
   9| HOLD| The data hold function is active
   10| MAX/MIN| MAX, MIN value.
   11| | Relative measurement.
   12| hFE
   NCV °C/°F
   MΩ, kΩ ;Ω mV, V
   uA, mA, A| Null.
   Non-contact voltage detecting.
   Temperature unit: °C/°F.
   Resistance unit: MΩ, kΩ, Ω.
   Voltage unit: mV, V. testing
   Current unit: UA(Null), mA (Null), A

(9) VΩ input terminal: Measurement inputs positive terminal (red test lead). COM input terminal: Measurement inputs negative terminal (black test lead).
(10) Carrying belt.
4.2 DCA MEASUREMENT

1. Turn the rotary function switch to the ” “position. The meter defaults at DCA measurement after power is on. Press SELECT to switch to DC measurement.
2.  The meter defaults to Auto Range mode and displays the symbol “AUTO” on the LCD, press the” RANGE” key to switch to Manual range mode, 20A. 200A and 1000A DCA ranges are selectable.
3. Press REL to clear to zero before measurement. Press the clamp gunlock to open the clamp jaw to get the testing wire inserted in the middle and clipped completely.
4. Take the testing conductor’s current value on the display. To ensure measurement accuracy, please check to ensure that the testing wire is placed in the middle of the clamp jaw. Measure one wire at one time. If measure more than one wire in one time, the reading will be inaccurate.
5. When the meter is used in a strong magnetic field, the readings could be unstable or inaccurate.

NOTE :

1. The meter uses a Hall component to detect current. The Hall component is a sensitive component. It is magnetic sensitive. It is also sensitive to temperature and mechanical stress. Any impact on it would cause changes in reading in a short time. This causes some remaining values on the DC ampere reading when there is no current. To get an accurate reading, press the REL key to clear the reading before measurement, and the testing wine must be placed in the middle of the clamp jaw.
2. Press the clamp gunlock to open the clamp jaw to get the testing wire inserted in the middle and clipped completely. Ensure that the testing wire is placed in the middle of the clamp jaw. Otherwise, there will be additional accuracy *1.0% of reading. Read the measurement current value of the testing wire on the LCD.
3. In the measurement of the DC current, if the reading is a positive value, the current is top to down (broad is top, the bottom cover is down).
4. The max testing current is 1000A. Exceeding the rated current for a long time will damage the meter. Follow the below instructions to get a more accurate DC current measurement:
   1)Switch off the testing wire.
   2)Press the clamp gunlock to open the clamp jaw to get the testing wire inserted in the middle and clipped completely. Ensure that the testing wire is placed in the middle of the clamp jaw.
   3)When the meter reading is stabilized at the minimum value, press the REL key to clear it.
   4)Switch on the testing wire. Read after the clamp meter remains stable.
   5)When measuring current, to get more accurate readings, the ambient temperature must be 0 to 40°C.

4.3 ACA measurement

1.  Bun the rotary function switch to position. The meter defaults at DCA measurement after power is on. Press SELECT to switch to AC measurement.
2. The meter defaults to Auto Range mode displays the symbol “AUTO” on the LCD and presses the” RANGE” key to switch to Manual range mode, 20A, 200A, and 1000A DCA range selectable.
3. Press the clamp gunlock to open the clamp jaw to get the testing wire inserted in the middle and clipped completely.
4. Take the testing conductor’s current value on the display. To ensure measurement accuracy, please check to ensure that the testing wire is placed in the middle of the clamp jaw. t the most precise reading, should the user put the wire in the middle of the closed jaw?

Note:

1. Firstly users should select the highest range, if users are not sure about the range of current under test, and then select the proper range based on displaying value.
2. If the LCD displays “OL”, it means the current is over range. Should the user select a higher range.
3. When AC current measurement, the current gear will automatically return to zero, so AC Current Gear does not need to press the REL key to clean
4. Maximum input current is 1000A. A current higher than that would damage the fuse and may cause damage to the circuit of the meter.

4.4 DCV measurement

1. Insert the black test lead into the “COM” jack and read one into the “V/Ω” jack.
2. Turn the function swift to “ ” range. This meter defaults to ACV measurement. Press “SELECT’ to choose DV or AC measurement.
3. This meter defaultsAuto Range mode and displays “AUTO” on the LCD. Press the “RANGE” key to swift to Manual Range mode. The selectable ranges are 200mV, 2V, 20V, 200V, and 1000V.
4. Connect the test lead to the test point, LCD will display the voltage and polarity of the test point connected by the red test lead.

Note

1. Under Manual Range mode, if the LCD display “OL”, it means over range, the user should turn to a higher range.
2. Do not input a voltage over 1000V or it may cause damage to the circuit of the meter.
3. Be careful while measuring a high-voltage circuit. DO NOT touch the high-voltage circuit.
4. The buzzer will beep to alert the user when the measuring voltage is over 1000V.

4.5 ACV measurement

1. Insert the black test lead into the “COM” terminal and the red one into the “v/Ω” terminal.
2. Set the rotary switch to the “ ” range. This meter defaults to ACV measurement mode. Press the “SELECT’ key to turn to DC or AC measurement mode.
3. Auto R env is the original state of this meter. It will display the “AUTO” symbol on the LCD. Press the “RANGE” key to change to Manual Range mode. 2V, 20V, 200V, and 750V ranges are selectable.
4. Connect the test leads to the test point. LCD will display the voltage of the two test points.

Note:

1. Under Manual Range mode, if LCD displays “OL”, it means over range, the user should select a higher range.
2. Do not input a voltage over AC 750V. It may cause damage to the circuit of the meter.
3. Bc careful while measuring a high-voltage circuit. Do not touch the high-voltage circuit.
4. The buzzer will beep to alert the user when the measuring voltage is over AC750V.

4.6 Non-Contact Voltage Detecting

1. WARNING This Function might be disturbed by different external Sources, then might be incurred a wrong alarm reminder, test result is just for reference when using this function. Turn the Switch button to the “NCV” position, and the Target Circuit to be placed on the top of the Meter, Meter will show strong and weak signals, meanwhile, Beeper will make a “tick-tick-tick” alarm reminder.

Note :

1. Even if there is no indication, the voltage might still be there. Do not rely on the NCV detector as the only way to judge whether a Voltage still exists on the Wire lead or not.
2. Voltage detection may be affected by power socket design, type of insulation and thickness, and other factors.
3. Interference sources in the external environment such as flashing lights, or the motor might cause a wrong signal for a wrong judgment.

4.7 Resistance measurement

1. Insert the black lead into the “COM” terminal and the red one into the “V/Ω” terminal.
2. Set the rotary switch to the “Ω” range.
3. The auto range is the original state of this meter. Press the “RANGE” key can choose the manual range.

Note :

1. Please select the highest range, if the value of resistance is unknown, and then select the proper range based on the displayed value.
2. The LCD displays “OL” when the resistance is over the selected range and the knob should be adjusted to a higher range. When the measuring value is over 1MΩ, the reading will take a few seconds to be stable. This is normal for high resistance measurement.
3. When the input terminal is in an open circuit, LCD will display “OL”.
4. Before measuring the inline resistor, make sure that the power is off and all capacitors have discharged completely.
5. When there is a big error, it may be affected by other online components or there is the voltage on the resistor.
6. Do not apply any voltage at the resistance range.

4.8 Diode and Continuity test

1. Insert the black test lead into the “COM” terminal and the red one into the “V/Ω” terminal (the polarity of the red lead is “+”).
2. Set the rotary switch to 44-0)) range . The original state is diode measurement mode.
3. Forward measurement: Connect red test lead to the positive polarity and the black test lead to the cathode polarity of the diode. LCD will display the approx. value of forwarding voltage drop.
4. Backward measurement: connect red test lead to the cathode polarity and the black test lead to positive polarity of the diode. LCD will display “OL”.
5. The complete diode testing includes forward and backward measurement, if the result doesn’t meet the descriptions above; it means the diode is broken.
6. Press SELECT key to select the continuity measurement mode.
7. Connect test leads to two points of tested circuit, if the resistance is less than 5052, the buzzer sounds.

Note:

1. Don’t input voltage at “ “range.
2. When testing circuits, make sure the power is off and all capacitors are discharged. Any negative potential or AC signal will make the buzzer sound.

4.9 Temperature measurement

1. Turn the Switch button to “°C/°F”, and press the “SELECT’ key to choose °C or °F measurement mode.
2. Insert the black plug of the thermocouple sensor into “COM” and the red one into the “V/Ω” jack, and put the working terminal (temperature measuring end) of the thermocouple on the surface or inside the object to be tested. Then you can read the temperature from the screen, and the data is in Centigrade.

Note:

1. If insert the thermocouple oppositely, it will display the wrong value. When the temperature is rising, the value will be down.
2. When the input terminal is open circuit, it will display the environment temperature.
3. Don’t change the temperature probe randomly, or the accuracy will not be guaranteed.
4. Don’t input voltage at temperature range.

4.10 AUTO POWER OFF

1.  The meter will auto-power off if there is no operation in 15 minutes and come into dormant mode. The beeper will sound five times within 1 minute before powering off.
2. Press the “SELECT” key and turn on the meter or press” SELECT” when the meter is a dormant mode to wake up the meter and the “AUTO POWER OFF” function will be canceled.

MAINTENANCE

The meter is a precise instrument. Random changes to the circuits should be avoided.

Note:

1. DO NOT put a voltage higher than DC 1000V or AC 750V RMS.
2. DO NOT apply voltage in current, resistance, diode, and continuity range.
3. DO NOT make any measurements when the battery isn’t installed or the back cover isn’t fixed.
4. Before replacing the battery or fuse, please remove the test leads from the measuring point and um off the power.
5. Keep the meter away from water, dust, and shock.
6. DO NOT use the meter under high temperature, high humidity, combustible, explosive, and strong magnetic environments.
7. Clean the case with a damp cloth and mild detergent only. DO NOT use abrasives or alcohol or any other strong solvents to clean the meter.
8. To avoid leakage damage, please take out the battery if the meter will not be used for a long time.
9. When a symbol is displayed, you should replace the battery according to the following steps:
   a) Unscrew the screw on the battery door and remove the cover.
   b) Replace the old battery with a new one (1.5V). (For long life, it’s better to use an alkaline battery.)
   c) Replace the battery door and tighten the screw.

TROUBLESHOOTING

If the meter does not work properly, please check the meter as the following steps:
(If the problem still persists, please contact the air in the center or the local dealer.)

❑ Battery: Replace the battery
❑ Hold Key: Release the HOLD key
signal displaying| ❑ Battery: Replace the battery
Big error value| ❑ Battery: Replace the battery

• The specifications are subject to changes without prior notice.
• The content of this manual is regarded as correct. If users find out any mistakes or omissions, please kindly contact the manufacturer.
• The manufacturer will not responsible for accidents and damage caused by improper operations.
• The functions described in this User Manual shall not be considered as the reason for any special usage.

EN-2046V0.1

Documents / Resources

| HTC INSTRUMENT CM-2046 Digital AC-DC Clamp Meter [pdf] User Manual
CM-2046 Digital AC-DC Clamp Meter, CM-2046, Digital AC-DC Clamp Meter, AC-DC Clamp Meter, Clamp Meter, Meter
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