Extech 380974 Operating Manual
User's Manual
AC Clamp Meter + Phase Rotation Tester
Model 380974
Introduction
Congratulations on your purchase of the Extech 380974 AC Clamp Meter + Phase
Rotation Tester. This professional 1000A Clamp meter also provides phase rotation
testing where motor direction (clockwise or counter-clockwise) and phase sequences
(L1, L2, & L3) can be displayed. Careful use of this meter will provide years of reliable
service.
Hz
CAT III
CAT III
600V
600V
Specifications
Clamp jaw size 1.6” (40mm)
Battery type 9V
Range Selection Manual
Display 3 ¾ digit (4000 count) multi-function LCD with 40-
Overload Indication ‘OL’ displays on LCD
Power 9V battery (200 hour life typical)
Low Battery Indication Battery icon displays on LCD
Auto Power Off After 30 minutes (feature can be disabled)
Display update rate 1.3 updates/second (digital display); 13.3
Operating Temperature / RH 32 to 122
Storage Temperature / RH 14 to 140
Dimensions/Weight 9 x 3 x 1.5” (228 x 76 x 39mm) / 13 oz. (370g)
Function Range Resolution Accuracy
AC Current
40A 0.01
400A 0.1A
1000A 1A
400V 0.1V ±(1.2% + 5d) (40 to 400Hz) AC Voltage
3-Phase
600V 1V ±(3.0% + 5d) (40 to 400Hz)
80V to 480V Frequency Response 40Hz to 400Hz
sequence
Resistance
40KΩ 10Ω
Frequency 4KHz 1Hz ±(0.5%rdg + 5d)
Capacitance 400uF 1uF ±(3% + 5d)
Continuity Audible alert <40 ohms
(open circuit < 3V, short circuit: 0.8mA)
PEAK HOLD
(Capture
time:
100ms)
AC Voltage Resolution Accuracy (of reading)
400V 0.1
600V 1V
AC Current
40A 0.01A
400A 0.1A
1000A 1A
Overload Protection
AC Current, Frequency (clamp) 1100A
AC Voltage, Sequence, Resistance, Capacitance, Frequency (leads) 600V rms
segment bargraph indication
updates/second (bargraph)
o
F (0oC to 50oC) / <80%
o
F (-10oC to 60oC) / <70%
(% of reading + digits)
±(2.0% + 5d)
Freq. range: 40 to 400Hz
±(1.0% + 5d)
Sensitivity: 10A (clamp), 30V (leads)
±(2.5% + 10d)
±(2.5% + 10d)
Specification notes: Accuracy is % of reading + number of digits at 64 to 82oF (18 to
o
C) <80% RH. The accuracy specs apply to measurements taken in the largest circle
28
inside the clamp jaw (see diagram).
Circle inside clamp jaws
2
Model 380974 V1.8 Sept 2003
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