Extech 38394 Operating Manual
User Guide
Digital AC/DC Clamp Meter
Model 38394
Introduction
Congratulations on your purchase of Extech’s 38394 AC/DC Clamp Meter. This clamp
meter measures AC/DC Current to 600A, DC/AC Voltage, Resistance, Frequency,
Diode, and Continuity. This meter is shipped fully tested and calibrated and, with proper
use, will provide years of reliable service.
Safety
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
WARNING: This indicates that a potentially hazardous condition which, if not avoided,
CAUTION: This indicates that a potentially hazardous condition which, if not avoided,
Safety Precautions
WARNING: Improper use of this meter can cause damage, shock, injury or death. Read and
1. Always remove the test leads before making current measurements
2. Always remove the test leads before replacing the batteries
3. Inspect the condition of the clamp jaw, test leads and the meter for any damage
4. Do not exceed the maximum rated input limits
5. Use great care when making measurements, especially when the voltages are
6. Always discharge capacitors and remove power from the DUT (device under test)
7. Remove the batteries from the meter if the meter is to be stored for long periods
8. Ensure that the selected meter function matches the measurement to be taken
9. If the measured current is higher than the range selected for long periods,
10. To avoid discharge risks and erroneous readings, do not measure current on high
could result in death or serious injury.
could result in injury or damage to the meter.
understand this User Guide before operating the meter.
before operating the meter. Repair any damage or replace meter before use
greater than 25VAC rms or 35VDC. These voltages are considered a shock hazard
before performing Resistance or Continuity tests
overheating may occur compromising the safety and the operation of the meter’s
internal circuits
voltage conductors (>600V)
2
Model 38394 Version 3.0 11/07
Specifications
Function Range Accuracy
AC/DC Current
AC Voltage 4.000V, 40.00V, 400.0V, 600.0V ±(1.2% rdg + 5d)
Resistance
Frequency (≥ 5V)
Continuity
Input Limits
Conductor Size 1.18" (30mm) maximum
Battery type Two (2) 1.5V AA batteries
Range Selection Automatic ranging
Display 5000 Count LCD
Overload Indication "1" or “-1”
Low Battery Indication Battery icon
Environmental conditions Installation Category III (clamp); Category II (DMM),
Operating Temperature/Humidity 32º to 122ºF (0
Storage Temperature/Humidity 14º to 140ºF (-10
Dimensions 7.0 x 4.2 x 1.3” (178 x 64 x 33mm)
Weight 8.3 oz. (230g)
Zero Adjust REL (Relative) push button
Diode Short/Open, Good/Defect Test
Sample Time 0.35 sec approx.
Input Impedance 10MΩ for ACV & DCV
400.0A (AC Amps 0.5 to 400.0A) ±(2% rdg + 5d)
600A ±(2% rdg + 8d)
400.0mV ±(0.5% rdg +2d) DC Voltage
4.000V, 40.00V, 400.0V, 600V ±(1.0% rdg + 2d)
400.0Ω, 4.000kΩ, 40.00kΩ, 400.0kΩ
4.00MΩ
40.00MΩ
5.00Hz, 50.0Hz, .500kHz, 5.00kHz,
50.0kHz, 100.0kHz
Audible tone <10Ω approximately
Function
V DC/AC 600V DC or
A DC/AC 600A DC/AC,
Maximum
Input
AC Peak
fused
Pollution degree 2; Altitude: 2000 meters, Indoor use
only
Function
Frequency 250V DC or AC peak
Resistance 400V DC or AC peak
o
C to 50oC) / <80% RH
o
(AC @ 50/60Hz)
(AC @ 50/60Hz)
±(1% rdg + 5d)
±(2% rdg + 2d)
±(3.5% rdg + 5d)
±(1% rdg + 5d)
Maximum
Input
(<10 seconds)
C to 60oC) / <80% RH
3
Model 38394 Version 3.0 11/07
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