Extech Instruments 38073A User manual

USER MANUAL
Mini Analog MultiMeter
Model 38073A
Please visit www.extech.com for user manual translations
Shop for Extech products at: 1.888.610.7664
ShopExtech.com

38073A-en-GB_v1.0 9/16
2
Introduction
Thank you for selecting the Model 38073A Mini Analog
MultiMeter. The 38073A measures AC/DC Voltage, DC mA
Current, Resistance, dB, and 1.5V/9V batteries. This device is
shipped fully tested and calibrated and, with proper use, will
provide years of reliable service. Please visit our website
(www.extech.com) to check for the latest version of this User
Manual, Translations, Product Updates, Product Registration,
and Customer Support.
Features
Easy to read, color coded display
Analog meter with battery test
Lightweight, rugged construction
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed
installations. Examples include switches in the fixed installation and some
equipment for industrial use with permanent connection to the fixed
installation.
Safety Information
To ensure the safe operation and service of the meter, follow these instructions
closely. Failure to observe warnings can result in severe injury.
WARNINGS
WARNINGS identify hazardous conditions and actions that could cause BODILY HARM
or DEATH
Keep hands and fingers behind the finger guards at all times.
Remove test leads before opening the meter.
Use the meter only as specified in this User Manual.
Use the proper terminals when taking measurements.
Verify the meter’s operation by measuring a known voltage.
Do not apply more than the rated voltage between terminals or between any
terminal and earth ground.
Replace blown fuses with fuses of the same type and rating.
Voltages above 30 VAC RMS, 42 VAC peak, or 60 VDC pose a shock hazard.
Do not measure voltage above 300V in CAT III installations.
Shop for Extech products at: 1.888.610.7664
ShopExtech.com

38073A-en-GB_v1.0 9/16
3
To avoid electric shock, replace batteries when necessary.
Disconnect power to the circuit under test and discharge all capacitors before
testing resistance.
Do not use the meter in the presence of explosive gas or vapor.
To reduce risk of fire or electric shock, do not use the meter if it is wet.
Individual protective equipment should be used if HAZARDOUS LIVE parts in the
installation where measurements are to be carried out could be accessible.
CAUTIONS
CAUTIONS identify conditions and actions that could cause DAMAGE to the meter or
equipment under test.
Disconnect test leads before changing the position of the rotary switch.
Do not expose the meter to extremes in temperature or humidity.
Safety Symbols
This symbol, adjacent to another symbol, indicates the user must
refer to the manual or user guide for further information.
Risk of electrical shock
Equipment protected by double or reinforced insulation
Description
Meter Description
1. Analog scale
2. Mechanical zero
3. Rotary switch
4. V-mA-Ω positive input jack
5. COM negative input jack
6. Zero Ω adjustment dial
7. Pointer needle
Shop for Extech products at: 1.888.610.7664
ShopExtech.com

38073A-en-GB_v1.0 9/16
4
Display Description
1. Resistance Ohms (Ω) measurement scale
2. Voltage / DC mA measurement scale
3. 10V AC measurement scale
4. Battery Test measurement scale
5. Decibel (dB) measurement scale
6. dB conversion chart
Operating Instructions
WARNING: Risk of electrocution. High-voltage circuits are
extremely dangerous and should be measured with care.
Getting Started
Before taking any measurements, use a flat head screwdriver to
turn the mechanical zero adjustment screw (2) until the pointer
needle (7) points to the zeros at the left end of the scale. For
greater accuracy, lay the meter on a flat, non-metallic surface
when testing.
Shop for Extech products at: 1.888.610.7664
ShopExtech.com

38073A-en-GB_v1.0 9/16
5
AC/DC Voltage Measurements
CAUTION: Do not measure voltages higher than 300V. Damage
may occur to the meter.
1. Set the function switch to the correct AC/DC voltage range.
2. Insert the black test lead into the COM input and the red
test lead into the VmAΩ input.
3. For DC, touch the black test lead to the negative side of the
circuit under test and touch the red test lead to the positive
side. For AC, the test lead polarity is not a factor.
4. For DC only, if the pointer needle deflects to the left side of
the scale, reverse the test leads.
5. Use the chart below to read AC/DC voltage measurements.
ACV Range
DCV Range
Scale
Multiply reading by
N/A
2.5
0-250
0.01
10
10
0-10
1
50
50
0-50
1
250
250
0-250
1
300
300
0-300
1
DC mA Current Measurements
1. Set the function switch to the correct mA DC range.
2. Remove power to the circuit under test and open the circuit
at the point to be measured.
3. Insert black test lead into the COM input and red test lead
into the VmAΩ input.
4. Touch the black test lead to the negative side of the circuit
and the red test lead to the positive side.
5. Apply power to the circuit.
6. If the needle deflects to the left, reverse the test leads.
7. Use the chart below to read DC mA measurements.
DCmA Range Setting
Scale
Multiply reading by
10
0-10
1
250
0-250
1
Shop for Extech products at: 1.888.610.7664
ShopExtech.com

38073A-en-GB_v1.0 9/16
6
Resistance Measurements
WARNING: To avoid electric shock, disconnect power to the unit
under test and discharge all capacitors before taking resistance
measurements.
1. Before testing resistance, test the condition of the battery:
a. Set the function switch to ΩX1K or ΩX10 position.
b. Short the test leads. The needle deflects to the right side.
c. Keep the test leads shorted. Turn the 0 Ω adjustment
dial (6) until the needle reads zero Ω.
d. If the needle will not zero, replace the battery.
2. Set the function switch to the X1K or X10 range.
3. Insert the black test lead into the COM input and the red
test lead into the VmAΩ input.
4. Touch the test leads across the circuit. Disconnect one side
of the part under test so the rest of the circuit will not
interfere with the resistance reading.
5. Read the measured resistance on the green Ωscale and
multiply the reading by 10 or 1000 (see step 2).
6. When switching between functions, always zero the needle
again (step 1) to avoid inaccurate readings.
Battery (1.5V and 9V) Testing
1. Set the function switch to the 1.5V or 9V position.
2. Insert the black test lead into the COM input and the red
test lead into the VmAΩ input.
3. Touch the black test lead to the negative side of the battery
and the red test lead to the positive side of the battery.
4. Use the display scale labeled BAT to determine the quality
of the battery.
Green=Good
?=Replace Soon
Red=Replace Immediately
Shop for Extech products at: 1.888.610.7664
ShopExtech.com

38073A-en-GB_v1.0 9/16
7
Decibel (dB) Measurements
The decibel scale measures the milliwatt power dissipation on a
600Ωload by measuring the voltage across the load. An AC
voltage of 0.775Vrms across 600Ωis equal to 1mW or “0” dB.
1. Insert the black test lead into the COM input and the red
test lead into the VmAΩ input.
2. Set the function switch to the desired AC voltage range and
read the decibel measurement on the bottom (red) scale.
3. Use the decibel conversion chart located on the meter to
calculate the measurement for the AC voltage range.
Maintenance
WARNING: To avoid electrical shock, turn meter off, remove test leads, and
disconnect meter from any circuit before opening the case.
Battery Replacement
1. Turn meter off and disconnect test leads from the meter and circuit under test.
2. Remove the (1) Phillips head screw on the back of the meter.
3. Open battery compartment, replace (1) 1.5V ‘AA’ battery observing correct
polarity. Re-assemble the meter before use.
Safety: Never dispose of batteries in a fire. If the meter is not to be used for 60 days
or more, remove the battery and store separately.
Never dispose of used batteries or rechargeable batteries in household
waste. As consumers, users are legally required to take used batteries to
appropriate collection sites, the retail store where the batteries were
purchased, or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is
obligated to take end-of-life devices to a designated collection point for the
disposal of electrical and electronic equipment.
Fuse Replacement
1. Turn the meter off and remove the test leads from the meter.
2. Remove the Phillips head screw from the back of the meter and lift off cover.
3. Replace the fuse with one of the same type and rating. Re-assemble the meter.
Shop for Extech products at: 1.888.610.7664
ShopExtech.com

38073A-en-GB_v1.0 9/16
8
Specifications
Specifications stated for ambient conditions 23oC ±2oC (73.4oF
±3.6oF); Relative Humidity < 60%
Function
Range
Accuracy
AC Voltage
10 / 50 / 250 / 300 VAC
± 5% of Full Scale
DC Voltage
2.5 / 10 / 50 / 250 / 300 VDC
± 4% of Full Scale
DC Current
10 / 250 mA
± 4% of Full Scale
Resistance
Rx10 / Rx1K
± 4% of Full Scale
Battery Test
1.5V / 9V
Decibels
-20dB to +22dB (AC Voltage range 10V)
Sensitivity
10kΩ per 1VDC / 4.5kΩ per 1VAC
General Specifications
Display Analog with Zero Adjustment
Operating Temp./Humidity 18 - 25°C (64 - 77°F); <75% RH
Operating Altitude 2000m (7000 ft.) maximum.
Battery One (1) 1.5V ‘AA’ Battery
Fuse 500 mA / 500V fast blow
Dimensions 116 x 68 x 34 mm (4.6 x 2.7 x 1.3”)
Weight 120g (4.2 oz.)
Safety Compliance EN61010-1: CATIII 300V; Pollution Degree 2
Ingress Protection Rating IP20
Standards CE and ETL
Copyright ©2016 FLIR Systems, Inc.
All rights reserved including the right of reproduction in whole or in part in any form
www.extech.com
Shop for Extech products at: 1.888.610.7664
ShopExtech.com