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380926-NIST
User manual
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Extech Instruments 380926-NIST, 380926 User manual

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User's Manual
2000A Auto Ranging True RMS Clamp + DMM
MODEL 380926
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INTRODUCTION
Congratulations on your purchase of Extech’s 380926 Clamp meter + Digital MultiMeter. This meter can measure to 2000A through the clamp and also measure to 400mA through the test leads. With Capacitance, Diode and Duty Cycle measurements, this meter provides the user with a full featured multimeter combined with the high amperage current clamp. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
SAFETY
Safety Symbols
WARNING: This indicates that a potentially hazardous condition which, if not avoided, could result
CAUTION: This indicates that a potentially hazardous condition which, if not avoided, could result
Safety Precautions
1. WARNING: Improper use of this meter can cause damage, shock, injury or death. Read and
2. Make sure any covers or battery doors are properly closed and secured.
3. Always remove the test leads before replacing the battery or fuses.
4. Inspect the condition of the test leads and the meter itself for any damage before operating the
5. Do not exceed the maximum rated input limits.
6. Use great care when making measurements if the voltages are greater than 25VAC rms or
7. Always discharge capacitors and remove power from the device under test before performing
8. Remove the battery from the meter if the meter is to be stored for long periods.
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
in death or serious injury.
in injury or damage to the meter Reply to request.
understand this user’s manual before operating the meter.
meter. Repair or replace any damage before use.
35VDC. These voltages are considered a shock hazard.
Capacitance, Diode, Resistance or Continuity tests.
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METER DESCRIPTION
Front panel
1. Current Sense Jaws
2. Function switch
3. Keypad
4. LCD display
5. Input jacks
Note: The tilt stand and battery compartment door are
located on the rear of the meter.
Symbols
AC current or Voltage
DC current or Voltage
Continuity
H Display hold
REL Relative
AUTO Auto range
Diode
Display Backlight
Units
mV, V millivolt, volt (voltage)
Ω, kΩ, MΩ ohm, kilohm, megohm (resistance) % percent (duty cycle)
μA, mA, A microamps, milliamps, amps (current) Hz, kHz hertz, kilohertz (frequency)
nF, μF nanofarad, microfarad (capacitance)
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OPERATING INSTRUCTIONS
Current Measurements using the Clamp, DC/AC
WARNING: Make sure that the test leads are disconnected from the meter’s terminals before
WARNING: For safety, use the rubber input terminal cover when measuring current using the
1. Set the Function switch to 2000A position.
2. Press the FUNC key to select AC or DC current
3. For DC current measurements, push & hold the DCA ZERO button until the reading indicates zero.
4. Press the trigger to open jaw. Fully enclose the conductor to be measured (see diagram).
5. The clamp meter will automatically select the proper range (Auto Range). To select the range manually, press the RANGE button before pressing DCA ZERO button.
6. Read the measured value from the LCD display.
NOTE: If the DCA zero button is used to zero the
Current Measurements using the Test Leads, DC/AC
1. Set the Function switch to the mA or µA position.
2. Press the FUNC key to select AC or DC.
3. Connect the black test lead to the COM terminal and the red test lead to the mA µA input jack.
4. Break the circuit under test (put the meter in series with circuit under test) refer to diagram.
5. Read the measured value from the LCD display.
NOTE: The maximum reading for direct input current is 240mA AC/DC.
making current measurements with the clamp jaw.
Clamp.
INCORRECT
meter, the clamp meter remains in the auto-range mode. If the REL button is used, the clamp meter will be placed in the manual range mode.
More than one
conductor in jaws
CORRECT
One conductor in jaws
µA and mA
Current
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Voltage Measurements, DC/AC
1. Set the Function Switch to the V position.
2. Press the FUNC key to select AC or DC.
3. Insert the black test lead to the COM input jack and the red test lead into the V input jack.
4. Connect the test leads in PARALLEL with the circuit to be measured (see diagrams).
5. Read the measured value from the LCD display.
Resistance Measurements
CAUTION: Before taking any in-circuit resistance measurements remove
power from the circuit under test and discharge all capacitors.
1. Set the Function switch to the Ω position.
2. Press the FUNC key until the ohms symbol appears on LCD.
3. Insert the black test lead to the COM input jack and the red test lead to the Ω input jack.
4. Connect test leads to the device under test (see diagram).
5. Read the measured value from the LCD display.
Continuity Test
1. Set the Function switch to the position.
2. Press the FUNC key until the "Ω" and " " symbols appear on the display.
3. Insert the black test lead to the COM input jack and the red test lead to the Ω input jack.
4. Connect the test lead tips to the device to be measured (refer to diagram for resistance measurements above).
5. Read the measured value from the LCD display.
6. If the resistance is < 10Ω approx. an audible signal will be heard.
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Diode Test
1. Set the Function switch to the diode position.
2. Press the FUNC key until the symbol appears on the LCD.
3. Insert the black test lead to the COM input jack and the red test lead to the input jack.
4. Connect the test lead tips to the diode. A typical diode forward voltage drop will indicate 0.3 to 0.7V. The reverse drop will indicate "OL", indicating high impedance. Proper diode check should include both forward and reverse tests.
RED REDBLACK BLACK
FORWARD TEST REVERSE TEST
Frequency Measurement
1. Set the Function switch to the Hz position.
2. Press the FUNC key until the "Hz" symbol appears on the LCD.
3. Insert the black test lead to the COM input jack and the red test lead to the Hz input jack.
4. Connect the tips of the test leads to the device to be measured (see diagram).
5. Read the frequency value in Hz on the LCD.
Duty Cycle Measurements
Follow the steps as for Frequency measurements with the following exception: Press the “Hz/%” key until the “%” symbol appears on the display.
Capacitance Measurement
1. Set the Function switch to the position.
2. Press the FUNC key until the "nF" symbol appears on the LCD.
3. Insert the black test lead to the COM input jack and the red test lead to the red input terminal.
4. Connect the tips of the test leads to the device to be measured (see diagram).
5. Read the capacitance value on the display.
NOTE: When making very low capacitance measurements, use the REL function
to zero any stray capacitance.
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Automatic / Manual Range Selections
The meter defaults to the autoranging mode when turned on. "AUTO" will appear in the display. To select manual ranging, press the RANGE key. Momentary presses of the RANGE key will step through the ranges. To return to the Auto Range mode, press and hold the RANGE key for 2 seconds.
Relative Reading Measurements
Press the REL key to enter the relative mode. "REL" will appear in the display. In the relative mode, the meter stores the reading that was on the display at the time of the REL key is pressed and displays the difference between the measured value and the stored value Press the REL key to return to normal mode.
Data Hold / Backlight key
Press the HOLD key momentarily to freeze the present reading on the LCD."H" will appear in the display. Press HOLD again to return to normal operation.
Backlight
Press and hold the Hold key for 2 seconds to activate the backlighting. The backlight will automatically turn off to conserve energy after approx 12 seconds.
MAINTENANCE
Battery Replacement
When the low battery symbol appears on the LCD, replace the meter’s 9V battery.
1. Remove power to the meter and remove test leads from meter
2. Remove the Phillips head screw (back of meter) and open the battery compartment.
3. Remove and replace the 9V battery.
4. Replace the compartment cover and rear screw.
You, as the end user, are legally bound (EU Battery ordinance) to return all used batteries, disposal in the household garbage is prohibited! You can hand over your used batteries / accumulators at collection points in your community or wherever batteries / accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle
Fuse Replacement
NOTE: Fuse Rating: 500mA (5mm x 20mm diameter)
1. The meter is provided with one overload protect 500mA fuse for current measurements (direct input NOT clamp measurements).
2. To replace the fuse, open the meter case by removing the battery cover and battery and then the four screws holding the rear case.
3. The fuse is located on the Main PCB.
4. Replace fuse and secure meter case.
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SPECIFICATIONS
Function Range Resolution Accuracy Remarks
(Clamp on) AC Voltage
True RMS
DC Voltage
Resistance
AC/DC Current (Direct Input)
Frequency
Capacitance
Duty Cycle 1 to 99% 0.1% ±(1% + 5d) Continuity Audible tone; <10 ohms approximately
400.0A 0.1A ±(2.0% + 5d) AC/DC Current 2000A 1A ±(2.0% + 8d)
4.000V 1mV
40.00V 10mV
400.0V 0.1V 1000V 1V
400.0mV 0.1mV ±(0.5% + 2d)
4.000V 1mV
40.00V 10mV
400.0V 0.1V 1000V 1V
400.0 Ω 0.1Ω
4.000 kΩ 1Ω
40.00 kΩ 10Ω
400.0 kΩ 100Ω
4.000 MΩ 1kΩ
40.00 MΩ 10kΩ
400.0µA 0.1µA 4000µA 1µA
40.00mA 0.01mA
400.0mA 0.1mA 5Hz 0.001Hz 50Hz 0.01Hz 500Hz 0.1Hz 5kHz 1Hz 50kHz 10Hz 100kHz 100Hz 50nF 10pF 500nF 100pF 5µF 0.001µF 50µF 0.01µF
Open circuit voltage; 0.5V approximately
±(1.2% + 5d) 45Hz to 1KHz
±(1.0% + 2d)
±(1.0% + 5d)
±(2.0% + 2d) ±(3.5% + 5d) ±(1.2% + 5d) 45Hz to 1KHz
±(1% + 5d)
±(3% + 5d) Accuracy stated
45Hz to 1KHz
Input Impedance: 10Mohms
Input Impedance: 10Mohms
after a relative "REL" zero performed
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Conductor Size 2.0”(50mm) maximum Measurement parameters ACA, DCA, ACV, DCV, Resistance, Diode, Frequency,
Current Sensor Hall Effect Zero adjust Automatic except for DCA (Push-button)
Diode Test Test current of 0.6mA typical;
Open circuit voltage <1.6V DC typical. Battery type 9V NEDA 1604 Range Selection Auto or manual Display 0.6” (15mm) 5000 Count Backlit LCD Overload Indication "OL" Power Consumption 5mA approx. Low Battery Indication Battery icon appears on LCD Sampling rate 1 reading every 0.35 seconds approx. Standards CE, IEC 1010-1 CAT III 1000V and CAT IV 600V Operating Temperature/Humidity 32 to 122 Dimensions 10 x 2.9 x 1.5” (255 x 73 x 38mm) Weight 0.85 lbs. (380g)
Maximum Rated Input Limits
Function Maximum Rated Input Limits
AC/DC Current 500mA AC/DC (fused)
AC Voltage 1000 VAC/DC
DC Voltage 1000 VAC/DC
Resistance 400 VAC/DC
Frequency 1000 VAC/DC
Capacitance 400 VAC/DC
Duty Cycle 1000 VAC/DC
Diode Test 400 VAC/DC
Capacitance, Duty Cycle, Continuity
o
F (0oC to 50oC) / <80%
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