CEM DT-350H Digital Clamp Meter Instruction Manual

: June 12, 2024
: CEM

Table of Contents

Safety
Description
Specifications
Operation
Button
Battery Replacement
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**CEM DT-350H Digital Clamp Meter Instruction Manual

**

Safety

International Safety Symbols

This symbol, adjacent to another symbol or terminal, indicates the user must referto 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
Do not apply voltage to meter when resistance function is selected
Set the function switch OFF when the meter is not in use.

WARNINGS

Set function switch to the appropriate position before measuring.
When measuring volts do not switch to current/resistance modes.
When changing ranges using the selector switch always disconnect the test leads from the circuit under fest.
Do not exceed the maximum rated input limits.

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.
Inspect the condition of the test leads and the meter itself for any damage before operating the meter. Repair o replace any damage before use.
Use great care when making measurements if the voltages are greater than 25VAC rms or 3VOC. These voltages are considered a shock hazard.
Remove the battery if the meter is to be stored for long periods.
Always discharge capacitors and remove power from the device under test before performing Diode, Resistance or Continuity tests.
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”.
If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

Input Limits
Function :Maximum Input
AAC: 400A
VAC/DC: 600
V DC/AC:
Frequency: 400V DC/AC
Resistance, Diode, Continuity: ~ 250V DC/ AC
Capacitance Test, Temperature

Description

Meter Description

Current Clamp
Non-Contact AC Voltage Indicator Light
Clamp Trigger
Rotary Function Swith
LCD Display
Data Hold Button
MODE and Relative Button
MIN/MAX Button
RANGE Button
COM Input Jack
VQ2 CAP TEMP Hz Jack
Battery Cover

Symbols Used on LCD Display

0C (Direct Currrent)
AC (Atternating Current) 3-Minus Sign
Auto Power Off
Auto Range Mode
Diode Test Mode
Audible Continuity
Data Hold Mode
Relative Mode
Max Reading
Min Reading
Units of Measure List 13-Low Battery
4000 Count (0 to 3999) Measurement Reading

Specifications

Function	Range & Resolution	Accuracy +(% of reading)
AC Current	[40.00 AAC	+(2.5% + B digits)
(60/60Kz)	400.0 AAC	+(2.8% + b digits]

ALLAC Current ranges are specified from 5% of range to 100% of range.
DC Voltage| [400.0 mvDC| +(0.5% + B digits)
| 4.000 VDC
| 4.000 VDC
| 400.0VDC
| 600.0 VDC
ACVoltage (50-1000Hz)| 4.000 VAC|
| 40.00 VAC| +(1.2% + 3 digits)
| 400.0 VAC
| 600.0 VAC
ALAC voltage ranges are specified for 5% of range to 100% of range. AC voltage Bandwidth: 50 to 60Hz(ALL Wave): 50 to 1KHz(Sine Wave).
Resistance| 400.00|
| 4.000K| +(1.5% + B digits)
| A0.00K|
| 400.0
| 4.000M| +(1.5% + B digits)
| 40.00M|
Capacitance| [4.000nF
| 40.000F| [+[6.0% + 40 digits]
| 400.0nF| +(4.0% + 10 digits)
| 4.0005F|
| 40.00yF| +(3.5% + b digits]
| 400.0pF|
| 4.000mF|
Temp (type k)| -20.0 to 760.c|
| 4010 T400.0°F| +-(1.5%+9F
Frequency (Auto-Ranging)| 10Hz| |(1.2% + b digits]
Sensitivity: >15V AC rms| |

General Specifications

Clamp Size :Opening 1.18″ (30mm) approx
Diode Test : Test current of TmA typical; Open circuit voltage 2V DC typical.
Continuity Test : Audible signal if the resistance is <50
Low Battery Indication: is displayed
Over Range Indication : “0L” s displayed
Polarity: Minus symbol ™” is displayed for negative polarity
Measurements Rate: 3 readings per second, nominal
Input Impedance: >10M Q) (VDC and VAC)
Display: 4000 counts LCD
AC Current : 50-60Hz (AAC)
AC Voltage Bandwidth : 50-1000Hz (VAC)
Operating Environmen t: 0t0 40°C (32 to 104°F) at 70% Relative Humidity
Storage Environment: -10t0 50°C (14 to 122°F) at 80% Relative Humidity
Operating Altitude : 2000meters
Safety: Category IIl 600V
Battery: To “AA 1.5V Batteries
Auto Off: Approx. 15 minutes

Operation

NOTICES: Read and understand all warning and precaution statements listed in the safety section of this operation manual prior to using this meter. Set the function select switch to the OFF position when the meter is not in use.

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

Set the Function switch to the 40A or 400A range.
If the range of the measured is not known, select the higher range first then move to the lower range if necessary
Press the trigger to open jaw. Fully enclose one conductor to be measured.
The clamp meter LCD will display the reading.

DC/AC Voltage(Frequency) Measurements
WARNING: Observe all safety precautions when working on live voltages.

Insert the black test lead into the negative COM terminal and the red test lead into the positive Vterminal.
Set the function switch to the VDC/AC position.
Select AC or DC with the MODE button,
Connect the test leads in parallel to the circuit under test.
Read the voltage measurement on the LCD display.
Press the button to indicate “Hz”MODE,
Read the frequency in the display.

Resistance Measurements

Insert the black test lead into the negative COM terminal and the red test lead into the positive terminal
Set the function switch to the Q-+« position.
Press the MODE button until the * 2 ™ symbol appears on the LCD display.
Touch the test lead probes to the component under test. If the component is installed in circuit, it s best to disconnect one side before testing to eliminate interference with other devices.
For Resistance tests, read the resistance on the LCD display.

Diode and Continuity Measurements
WARNING: Never test diodes in a live circuit.

Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive diode jack.
Set the rotary switch to the (2> position.
Press the MODE button until “+ appears in the display.
Touch the test lead probes to the diode under test.
Forward voltage will indicate 0.4V to 0.7V. Reverse voltage will indicate “0L”. Shorted devices will indicate near 0mV and an open device will indicate “OL” in both polarities.
Press the MODE button until “+ appears in the display.
For Continuity tests, a beeper will sound if the resistance is approx 50 ohms or less and the resistance reading will be shown on the LCD display.

Capacitance Measurements
WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any capacitance measurements. Remove the batteries and unplug the line cords.

Set the rotary function switch to the CAP position.
Insert the black test lead banana plug into the negative COM jack.Insert the red test lead banana plug into the positive V’ jack.
Touch the test leads to the capacitor to be tested.
Read the capacitance value in the display

Temperature Measurements
‘WARNING: To avoid electric shock, disconnect both test probes from any source of voltage before making a temperature measurement

Set the function switch to °C or °F.
Insert the Temperature Probe into the negative COM and the V/ jacks, making sure to bserve the correct polarity.
Touch the Temperature Probe head to the part whose temperature you wish to measure. Keep the probe touching the part under test until the reading stabilizes (about 30 seconds).
Read the temperature in the isplay. The digital reading will ndicate the proper decimal point and value.

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

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

Set the rotary function switch to the NCV position
Hold the detector close to the AC voltage being tested.
1f no signal is detected, the LCD will show “EF”, NCV indicator light doesn’t flashes and the buzzer is no sound According to the detected signal strength, LCD displays different horizontal lines.When the signal is strongest, LCD displays three horizontal lines, when the signal is weakest,only one line .Meanwhile, NCV indicator light flashes, buzzer make different sound.

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 s designed with high sensitivity. Static electricity or other sources of energy may randomly trip the sensor. This is normal operation.

Auto Power Off
The auto off feature will turn the meter off after 15 minutes. To disable the auto power off feature, hold down the MODE button and turn the meter on.

Low Battery Indication
The B icon will appear in the left corer of the display when the battery voltage becomes low. Replace the battery when this appears.

Button

MODE and REL Button

Press the MODE key to select AC/OC Voltage, AC Current ,0hms, Diode Test, Continuity or Capacitance and Temperature,
The RELATIVE function zeros out the reading on the display and stores it as a reference. Subsequent readings will be displayed as the relative difference between the actual measurement and the stored reference value. To activate, press the REL button, The “REL” indicator will appear on the LCD display along with the relative reading. Press the REL button again to return to normal operation

NOTE: REL does not work on Frequency, Diode Test, Continuity,

Data Hold Button

To freeze the LCD meter reading, press the data hold button.
The data hold button s located on the left side of the meter (top button)
While data hold is active, the HOLD display icon appears on the LCD.
Press the data hold button again to return to normal operation.

RANGE Button
When the meter is first turned on, it automatically goes into Auto Ranging. This automatically selects the best range for the measurements being mad e and is generally the best mode for most measurements. For measurement situations requiring that a range be manually selected, perform the following;

Press the RANGE button. The “Auto Range™ display indicator will turn off, The “Manual Range™ display indicator will tur on.
Press the RANGE button to step through the available ranges until you select the range you want.
Press and hold the RANGE button for 2 seconds to exit the Manual Ranging mode and return to Auto Ranging.

MAX/MIN Button

Momentarily press the button MAX/MIN o activate the MAX/MIN made. The “MAX indicator will appear on the LCD display. The meter will display and hold the maximum reading and will update when a higher” max” occurs.
Momentarily press the button again to view the lowest reading. The”MIN indicator MAX/MIN meter will appear on the LCD display. The meter will display and hold the minimum reading and will update when a lower “min” occurs.
Press and hold the MAX/MIN button to end MAX/MIN and return to normal operation.

NOTE: The meter does not auto range when the MAX/MIN mode is active, the display will read “0L” if the range is exceeded. When this occurs, exit MIN/NIN and use the RANGE button to select a high range. MAX/MIN does not work on Frequency, Duty Cycle, Diode Test, Continuity and Capacitance.