TRIPLETT CM400 400A TRMS AC Clamp Meter User Manual

: June 6, 2024
: TRIPLETT

Table of Contents

Introduction
Safety
Description
Display Icons Description
Operation
Function Buttons
Relative/Backlight Button
Maintenance
Specifications
General Specifications
Warranty Information
References
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User Manual
CM400
400A TRMS AC Clamp Meter

TRIPLETT CM400 400A TRMS AC Clamp Meter

Introduction

Congratulations on your purchase of the Triplett CM400 400A True RMS AC Clamp meter. The CM400 True RMS AC Clamp meter features:

AC Current measurements up to 400A.
Variable Frequency Drive (VFD) Voltage Measurements
Inrush Current Mode
Temperature Measurements
Non-contact AC voltage detection
Auto Power OFF

Safety

International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must refer to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use, hazardous voltages may be present
****Double insulation

SAFETY NOTES

Do not exceed the maximum allowable input range of any function.
When the instrument is not in use, press the ON/OFF key to turn off the meter.
Remove the battery if the meter is to be stored for longer than 60 days.

CAUTIONS

Improper use of this meter can cause damage, shock, injury or death.
Read and understand this user manual before operating the meter.
Always remove the test leads before replacing the battery.
The meter itself for any damage before operating the meter. Repair or replace any damaged before use.
Use great care when making measurements if the voltages are greater than 25VAC rms or 35VDC. These voltages are considered a shock hazard.
Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the recessed electrical contacts. Other means should be used to ensure that the terminals are not “live”.

TRIPLETT CM400 400A TRMS AC Clamp Meter -inputs limte

Description

Meter Description

1. NCV (Non-Contact Voltage) Sensor
2. Current Clamp
3. NCV (Non-Contact Voltage) Indicator LED
4. Clamp Trigger
5. Rotary Function Switch
6. LCD Display
7. Data HOLD/Flashlight Button| 8. REL/Backlight Button
9. Range Button
10. MODE and VFD Button
11. PEAK and INRUSH Button
12. Flashlight
13. Battery Cover
14. COM Input Jack (-)
15. Positive Input Jack (+)
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TRIPLETT CM400 400A TRMS AC Clamp Meter - Description

Display Icons Description

TRIPLETT CM400 400A TRMS AC Clamp Meter - Display I

1. REL/ ZERO Button
2. Alternating Current/Voltage
3. Direct Current/Voltage
4. Minus Sign
5. Low Battery
6. Auto Range Mode
7. INRUSH Current Mode
8. Display Hold
9. MAX/MIN Mode| 10. Variable Frequency Drive (VFD) Voltage Value
11. Diode Test
12. Continuity Test
13. Auto Power Off (APO)
14. Faranheit and Celcius Units (Temperature)
15. Units of Measure Prefixes
16. Hertz (Frequency)
17. Percent (%) Duty Cycle
18. Measurement Display Digits
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Operation

AC Current Measurements
NOTE: Ensure that the test leads are disconnected from the meter before making current clamp measurements.

Set the Function switch to the 400A range. If the approximate range of the measurement is not known, select the highest range then move to lower ranges if necessary.
Press the REL button to zero the meter display.
Use rotary function switch to select 40A AC or 400A AC range.
Select AC current Test, press the INRUSH/PEAK Button to turn Inrush current test, the LCD will display “—-”.
Press the trigger to open jaw, Fully, enclose only one conductor, For optimum results, center the conductor in the jaw.
The clamp meter LCD will display the reading.

AC Voltage Measurements

Insert the black test lead into COM input jack and the red test lead into the Positive input jacks.
Set the function switch to the VAC position.
Press the MODE/VFD Button for 1 second to turn on the VFD test.
Press the INRUSH/PEAK Button to turn on the PEAK test.
Connect the test leads in parallel to the circuit under test.
Read the voltage measurement on the LCD display.

DC Voltage Measurements

Insert the black test lead into COM input jack and the red test lead into the Positive input jacks.
Set the function switch to the VDC position.
Connect the test leads in parallel to the circuit under test.
Read the voltage measurement on the LCD display.

Resistance Measurements

Insert the black test lead into the COM input jack and the red test lead into the Positive input jacks.
Set the function switch to the ΩCAP position.
Touch the test probe tips across the circuit or component under test.
Read the resistance on the LCD display.

Continuity Measurements

Insert the black test lead into the COM input jack and the red test lead into the Positive input jacks.
Set the function switch to the “ ” position.
Use the MODE Button to select continuity “ ”, The display icons will change when the MODE button is pressed.
Touch the test probe tips across the circuit or component under test.
If the resistance is <50Ω, a tone will sound.

Capacitance Measurements
WARNING: To avoid electric shock, discharge the capacitor under test before measuring.

Set the function switch to the ΩCAP position.
Insert the black test lead into the COM input jack and the red test lead into the Positive input jacks.
Touch the test probe tips across the part under test, If “OL” appears in the display, remove and discharge the component.
Read the capacitance value in the display.
The display will indicate the proper decimal point and value.

Frequency Measurements

Insert the black test lead into the COM input jack and the red test lead into the Positive input jacks.
Set the function switch to the VAC Hz/% Position.
Press the MODE button to select the Frequency (Hz) or Duty Cycle (%).
Touch the test probe tips across the part under test.
Read the value on the display.
The display will indicate the proper decimal point and value.

Temperature Measurements

Set the function switch to the TEMP position.
Insert the Temperature Probe into the negative COM and Positive jacks, observing polarity.
Touch the Temperature Probe head to the device under test, Continue to touch the part under test with the probe until the reading stabilizes.
Read the temperature on the display, The digital reading will indicate the proper decimal point and value.
Use the MODE Button to select °C or °F.

WARNING: To avoid electric shock, be sure the thermocouple probe has been removed before changing to another measurement function.

Diode Measurements

Insert the black test lead into the COM input jack and the red test lead into the Positive input jacks.
Turn the function switch to “ ” position.
Use the MODE button to select the diode function if necessary (Diode a symbol will appear on the LCD when in Diode test mode)
Touch the test probe tips to the diode or semiconductor junction under test. Note the meter reading.
Reverse the test lead polarity by reversing the red and black leads, Note this reading.
The diode or junction can be evaluated as follows:

If one reading displays a value (Typically 0.400V to 0.900V) and the other reading displays “OL”, the diode is good.
If both readings display “OL” the device is open.
If both readings are very small or ‘0’, the device is shorted.

Non-Contact Voltage (NCV) Measurements
WARNING: Risk of Electrocution, always test the Voltage Detector on a known live circuit to verify proper operation before use.

Touch the probe tip to the hot conductor or insert into the hot side of the electrical outlet.
If AC voltage is present, the detector light will illuminate.

Note: The conductors in electrical cord sets are often twisted. For best results, rub the probe tip along a length of the cord to assure placing the tip in close proximity to the live conductor.
Note: The detector is designed with high sensitivity. Static electricity or other sources of energy may randomly trip the sensor. This is a normal operation.

Function Buttons

MODE and VFD Button

Short Press the MODE/VFD Button to toggle between modes available for the rotary switch position (V/Hz/%)
Long Press and Hold the MODE/VFD while POWERING ON will disable the Auto Power OFF (APO) Function
Long Press and hold MODE/VFD will engage VFD measuring mode. HOLD and Flashlight Button
To freeze the LCD reading, press the Hold/Flashlight Button.
While data hold is active, the “H” icon appears on the LCD.
Press the Hold/Flashlight Button again to return to normal operation.
The LCD is equipped with backlighting for easier viewing, especially in dimly lit areas.
Press the Hold/Flashlight Button to turn the Flashlight on, Press again to turn the Flashlight off.

Range Button

Press the RANGE button to activate the manual mode and to disable the Auto range function, The symbol “AUTO” disappears from the upper left part of the display.
In manual mode, press the RANGE Button to change the measuring range, the relevant decimal point will change its position.
The RANGE Button is not active in positions, , CAP, Hz%, Temp °C °F.
In Auto range mode, the instrument selects the most appropriate ratio for carrying out the measurement.
If reading is higher than the maximum measurable value, the indication “O.L” appears on the display.
Press and hold the RANGE button for more than 1 second to exit the manual mode and restore the Auto range mode.

PEAK/ INRUSH Button

In AC voltage test mode, Press PEAK/INRUSH Button the Peak maximum and Peak minimum values are measured.
In the current test mode, Press PEAK/INRUSH Button the Inrush current values are measured.

Relative/Backlight Button
The relative measurement feature allows you to make measurements relative to a stored reference value, A reference voltage, current, Capacitance, etc., and be stored and measurements made in comparison to that value, The displayed value is the difference between the reference value and the measured value.

Press the “REL/Backlight” Button to zero the display “ ” will appear in the display.
To exit this mode, press the “REL/Backlight” Button again, and “ ” will disappear in the display.
DC voltage measurement mode, Press the “REL/Backlight” Button to “zero” the display.
Press and hold the “REL/Backlight” Button to turn the Backlight on, Press and hold again to turn the Backlight off.

Relative/Backlight Button

In order to conserve battery life, the meter will automatically turn off after approximately 15minutes.
To turn the meter on again, turn the function switch to the OFF position and then to the desired function position.
To press and hold the MODE/VFD Button to turn the system on, the auto power-off function will be canceled.

Maintenance

WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove the test leads from the input terminals, and turn OFF the meter before opening the case. Do not operate the meter with an open case.
Cleaning and Storage
Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or solvents. If the meter is not to be used for 60 days or more, remove the battery and store it separately.
Battery Replacement

Remove the Phillips head screw that secures the rear battery door
Open the battery compartment.
Replace the 1.5V x 3 “AAA” batteries.
Secure the battery compartment.

Type K Temperature Probe Replacement
Note: To use a Type K thermocouple probe that is terminated by a subminiature (Flat blade) connector, a subminiature-to-banana plug adaptor is required.

Specifications

Note: Accuracy is given as ±(% of reading + counts of least significant digit) at 23 , with relative humidity less than 80%RH.C /±5

Function	Range	Resolution	Accuracy ±(% of reading+digits)

AC True RMS

Current

| 40.00A| 10mA| ±2.0% of rdg ± 8 digits
400.0A| 100mA| ±2.5% of rdg ± 8 digits
Over rang protection: Maximum input 400A;
Accuracy specified from 5% to 100% of the measuring range;
Frequency Response: 50Hz to 60Hz True RMS;
Inrush current Maximum Input: 400A; Inrush current Sensitivity: >2A.
AC True RMS

Voltage (with

VFD)

| 4.000V| 1mV| ±1.2% of rdg ± 5 digits
40.00V| 10mV
400.0V| 100mV
1000V| 1V| ±1.5% of rdg ± 5 digits
Variable frequency drive test AC voltage rang: 100V-600V.
AC voltage bandwidth:50 to 1000Hz(Sine); 50/60(All wave).
Accuracy specified from 5% to 100% of the measuring range.
Maximum Input: 1000V ac rms. PEAK Maximum Input: 1000V.
DC Voltage| 4.000V| 1mV| ±1.0% of rdg ± 3 digits
40.00V| 10mV
400.0V| 100mV
1000V| 1V| ±1.2% of rdg ± 3 digits
Maximum Input: 1000V dc
Resistance| 400.0Ω| 0.1Ω| ±1% of rdg ± 4 digits
4.000kΩ| 1Ω| ±1.5% of rdg ± 2 digits
40.00kΩ| 10Ω
400.0kΩ| 100Ω
4.000MΩ| 1kΩ| ±2.0% of rdg ± 5 digits
40.00MΩ| 10kΩ| ±3% of rdg ± 8 digits
Input Protection: 300V dc or 300V ac rms.
Capacitance

(Auto-Ranging)

(AC Current)

General Specifications

Clamp Jaw Opening	1.2” (30mm) approx
Display	3-3/4 digits (4000 Counts) backlit LCD
Low Battery Indication	is displayed
Over-Range Indication	“OL” display
Measurement Rate	3 readings per second, nominal
Temperature Sensor	Type K thermocouple
Input Impedance	10MΩ(VDC and VAC)
AC Response	True rms (AAC and
ACV Bandwidth	VAC) 2KHz
Operating Temperature	5 to 40°C (41 to 104°F)
Storage Temperature	-20 to 60°C (-4 to 140°F)
Operating Humidity	Max 80% up to 31°C(87°F) decreasing linearly to 50% at

40°C(104°F)
Storage Humidity| <80%
Operating Altitude| 7000ft. (2000meters) maximum.
Battery| 3 x 1.5V “AAA” Batteries
Battery Life| ~30h (Backlight ON), ~100h (Backlight OFF)
Auto Power Off| After approx. 15 minutes
Safety| For indoor use and in accordance
with the requirements for double insulation to
EN 61010-1:2010+A1:2019,
EN 61010-2-032:2012, EN 61010-2-033:2012 Low Voltage
Directive 2014/35/EU
Overvoltage Category III 600V, Pollution
Degree 2
Weight| 9.5oz (268.3g)
Dimensions| 8.8 x 3.0 x1.5” (223.8 x76.5 x 39.4 mm)

Warranty Information

Triplett / Jewell Instruments extends the following warranty to the original purchaser of these goods for use. Triplett warrants to the original purchaser for use that the products sold by it will be free from defects in workmanship and material for a period of (1) one year from the date of purchase. This warranty does not apply to any of our products that have been repaired or altered by unauthorized persons in any way or purchased from unauthorized distributors so as, in our sole judgment, to injure their stability or reliability, or which have been subject to misuse, abuse, misapplication, negligence, accident or which have had the serial numbers altered, defaced, or removed. Accessories, including batteries, are not covered by this warranty.
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