Extech 380973 Instruction Manual

INSTRUCTION MANUAL

Model 380973

True RMS AC Clamp-on DMM

• True RMS AC measurements enable

precision distorted or non-sinusoidal
waveform measurements

• Peak Hold and Data Hold

• Selectable temperature measurement units

• Frequency measurements using the current

jaws or using the test leads.

1. INTRODUCTION

Congratulations on your purchase of Extech’s 380973 True RMS AC Clamp-on DMM. This
professional meter, with proper care, will provide years of safe reliable service.

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2. SPECIFICATIONS

2.1 General Specifications

Clamp jaw opening diameter 1.6” (40mm)
Battery type 9V
Range Selection Manual
Display 3 ¾ digit (4000 count) LCD
Overload Indication ‘OL’ displays on LCD
Low Battery Indication ‘BT’ displays on LCD
Sampling rate 2.5 readings/sec
Operating Temp. / RH 32 to 104oF (0oC to 40oC); <80%
Storage Temp. / RH 14 to 140oF (-10oC to 60oC); <70%
Dimensions 9 x 3 x 1.5” (228 x 76 x 39mm)
Weight 12.4 oz. (385g)

2.2 Electrical Specifications

Resolution Accuracy

Overload Protect

(% of reading + digits))

AC Current (True RMS)

400A 0.1A

±(2.0% + 5d) (40 to 450Hz) 800A rms

600A 1A

AC Voltage (True RMS)

400V 0.1V
600V 1V

±(1.2% + 5d) (40 to 450Hz) 660V rms

input imp. 1MΩ

DC Voltage

600V 1V ±(0.75% + 2d) 660V rms

input imp. 1MΩ

Resistance

4KΩ 0.001kΩ

±(1.0% + 5d) 660V rms

< 3.2VDC open cir

Frequency

4KHz (clamp test) 1Hz ±(0.5%rdg + 5d) 800A (sensitiv.5A)

4KHz (lead test) 1Hz ±(0.5%rdg + 5d) 660V (sensitiv.1V)

Capacitance

2000uF 1uF ±(3% + 5d) 250V rms

Type-K Therm.

-20 to 300oC 1oC ±(2% + 3oC)

660 Vrms

300 to 1200oC 1oC ±(3.5% + 2oC)

-4 to 2192oF 1oF ±(3% + 8oF)

Continuity Buzzer <40 ohms (oc V=3V, sc A=0.8mA) 660 V rms
Diode Test

3V 0.001V ±(1%rdg + 2d) 660V rms

2.3 100mS PEAK HOLD (True RMS) Specifications

AC Voltage Resolution Accuracy (of reading) Overload

400V 0.1V

±(1.5% + 10d) 50 to 60Hz 660V rms
600V 1V
AC Current
400A 0.1A

±(2.0% + 10d) 50 to 60Hz 800A rms
600A 1A

SPECIFICATION NOTE: Accuracy is tested in a 64 to 82oF (18 to 28oC) <80% Relative
Humidity environment. The accuracy specs apply to measurements taken in the largest
circle inside the clamp jaw (refer to the diagram in Section 3).

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3. FRONT PANEL DESCRIPTION

1 Clamp jaw
2 Clamp measurement area
3 Jaw trigger – Press to open transformer jaw
4 LCD Display – Displays data, units, polarity,

decimal, peak/data hold icons, overload and low
battery indication.

5 Peak Hold key – Press to activate, press again to

deactivate.

6 Data Hold key - Press to activate, press again to

deactivate.

7 Rotary selector switch – Powers meter while

selecting function and range.

8 Negative input terminal – Black test lead

connection (COM).

9 Positive input terminal – Red test lead connection

for voltage, resistance, frequency, capacitance,
temperature, diode, and continuity tests.

10 Temperature units select key – Press to select

desired units

4. INTERNATIONAL SAFETY SYMBOLS

CAUTION:

Refer to

documentation

CAUTION:

Risk of
Electrical

Double

Insulation

Shock

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