Extech Instruments 380950 User Manual

380950 V1.0 6/07 8
Jaw size 0.5" (12.7mm) approx.
Display 4000 count LCD
Continuity Audible tone < 150Ω approx.
Diode Test Open circuit voltage < 1.5VDC; Test current <1mA (typical)
AC V bandwidth 50Hz to 400Hz
AC A bandwidth 50/60Hz
Low battery indication “ ” is displayed
Overrange indication “OL” is displayed
Auto Power OFF After 25 minutes
Measurement rate 2 per second, nominal
Input Impedance 7.8MΩ (V DC and V AC)
Operating Temperature 14ºF to 122ºF (-10ºC to 50ºC)
Storage Temperature -22
o
F to 140
o
F (-30
o
C to 60
o
C)
Operating Humidity Max 80% up to 87ºF (31ºC) decreasing linearly to 50% at
113ºF(45ºC)
Storage Humidity <80%
Operating Altitude 6560ft. (2000meters) operating
Batteries (2) 1.5V AAA batteries
Weight 0.44lb (200g)
Size 7.87” x 1.97” x 1.38” (200x50x35mm)
Safety For indoor use and in accordance with the requirements for
double insulation to IEC1010-1 (1995): EN61010-1 (1995)
Overvoltage Category III, Pollution Degree 2.
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORIES
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in
which measures are taken to limit the transient overvoltages to an appropriate low level.
Note – Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be
supplied from the fixed installation.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for
industrial use with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.
Note – Examples include electricity meters and primary over-current protection equipment

Extech Instruments 380950 Specifications

General

Model	380950
Frequency Response (Sound Level)	31.5Hz to 8kHz
Battery	9V
Display	LCD
Max Voltage	600V
Max Current	400A
Weighting Networks	A & C
Time Weighting	Fast/Slow

Summary

Safety

International Safety Symbols

Indicates user must refer to manual for further information or hazardous voltages may be present.

Safety Notes

Important precautions such as not exceeding input ranges or switching off the meter when not in use.

Warnings

Crucial warnings regarding function switch use, voltage limits, and test lead disconnection.

Cautions

Precautions for preventing damage, shock, injury, or death, including care with high voltages.

Operation

DC/AC Current Measurements

Instructions for measuring AC/DC current using the clamp meter, including zeroing the display.

DC/AC Voltage Measurements

Steps for measuring AC/DC voltage, including connecting test leads and selecting AC/DC mode.

Resistance Measurements

Procedure for measuring resistance, involving test probes and circuit disconnection for accuracy.

Continuity Check

How to perform a continuity check using the meter, noting the audible signal for low resistance.

Diode Test

Procedure for testing diodes, including forward and reverse voltage readings.

Capacitance Measurements

Steps for measuring capacitance, emphasizing safety by discharging capacitors first.

Frequency or % Duty Cycle Measurements

How to measure frequency and duty cycle using the Hz/% function.

Analog Signal Output

Details on using the analog signal output for DCA and ACA ranges with external devices.

Auto/Manual Ranging

Explanation of how to switch between autoranging and manual ranging modes.

Data Hold

Instructions on how to freeze the displayed reading using the HOLD button.

Backlight

How to turn the LCD backlight on and off using the HOLD button.

Zero Button

Information on using the ZERO button for Capacitance and DC Current measurements.

Specifications

PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORIES

OVERVOLTAGE CATEGORY I

Equipment connected to circuits with transient overvoltages limited to low levels.

OVERVOLTAGE CATEGORY II

Energy-consuming equipment supplied from fixed installations.

OVERVOLTAGE CATEGORY III

Equipment in fixed installations, like switches and industrial devices.

OVERVOLTAGE CATEGORY IV

Equipment used at the origin of an installation, like electricity meters.

Maintenance

Cleaning and Storage

Guidelines for cleaning the meter with mild detergent and storing it properly.

Battery Replacement

Step-by-step instructions for replacing the meter's batteries.

Warranty

Calibration and Repair Services