Extech 38073 Manual

Extech Multimeter 38073

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User’s Guide

Mini Analog

MultiMeter

Model 38073

Introduction

Congratulations on your purchase of the Extech model 38073 Analog Multimeter.

This device measures AC/DC Voltage, DC Current, Resistance, dB, and has battery

test, displaying measurements in analog format. Properly used, this meter will

provide many years of reliable service.

Safety

International 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

WARNINGS

1. When measuring voltage, ensure that the function switch is not in the current or

resistance positions. Before taking any measurement ensure that the function

switch is set to the appropriate position.

2. Use great care taking measurements when the voltages are greater than 25VAC

rms or 35VDC. These voltages are considered a shock hazard.

3. When taking current measurements ensure that the circuit under test is not "live".

Remove power to the circuit, apply the test leads, and then power the circuit.

4. For resistance measurements, ensure that the circuit or component is de-

energized.

5. Use care when measuring current transformers, high voltage may result at the

meter's terminals if an open circuit exists.

6. Ensure that the test leads are in good repair before each use. Have the meter

serviced if it appears that the test leads are damaged.

7. Do not exceed the measurement range limits specified by the manufacturer.

8. Replace fuse with fuse of the same rating only.

9. Before opening the case to replace battery or fuse, disconnect the test leads from

any circuit or component under test and turn the function switch to the OFF

position.

A UL mark does not indicate that this product has been evaluated for the accuracy of

its readings.

Specifications

Range Accuracy Sensitivity

DC Voltage 2.5, 10, 50, 250, 300V ± 5% of full scale 2KΩ / Volt sensitivity

AC Voltage 10, 50, 300V ± 5% of full scale 2KΩ / Volt sensitivity

DC Current 0.5, 10, 250mA ± 5% of full scale

Resistance Rx10, Rx1000 (Rx1k) ± 5% of full scale

Decibels -10 to 56 dB (0dB = 1mW

dissipated in 600Ω)

1.5V ± 10% of full scale Load current: 125mA Battery Test

9V ± 10% of full scale Load current: 10mA

Display type Analog Continuous

Operating Temp. 41 to 104oF (5 to 40oC)

Storage Temp 41 to 104oF (5 to 40oC)

Battery One 1.5V AA battery

Battery life 10 hours (continuous)

Fuses 500mA, 250V fast acting

Dimensions/Weight 3.5x6.1x1.9" (88x155x49mm) / 10.2 oz. (288g) approx.

Safety For indoor use and in accordance with Overvoltage

Category II, Pollution Degree 2. Category II includes local

level, appliance, portable equipment, etc., with transient

overvoltages less than Overvoltage Category III.

Meter Description

1. Analog Display

2. Display zero adjust

3. 0Ω adjust

4. Function select switch

5. Test Leads

Operation

NOTICE: Read and understand all warning statements listed in the safety

section of this operation manual prior to using this meter.

AC/DC Voltage Measurements

1. Set the function switch to the desired voltage range position. If the range of the

measurement is not known beforehand, select the highest range first and then

work down range by range.

2. Connect the test leads in parallel to the circuit under test.

3. Read the voltage measurement on the analog display.

DC mA Current Measurements

1. For mA current measurements set the function switch to the desired current range

position and insert the red test lead into the mA terminal. If the range of the

measurement is not known beforehand, select the highest range first and work

down range by range as needed.

2. Remove power from the circuit under test and open the circuit at the point where

you wish to measure current.

3. Touch the black test probe tip to the negative side of the circuit and touch the red

test probe tip to the positive side of the circuit.

4. Apply power to the circuit.

5. Read the current on the analog display. If the analog pointer fails to move during

current measurements, check the meter’s internal fuse.

Resistance Measurements

1. Set the function switch to the desired resistance range position.

2. Touch the test probe tips across the circuit or component under test. It is best to

disconnect one side of the resistor under test so the rest of the circuit will not

interfere with the resistance reading.

3. Read the resistance on the analog display.

Battery Test

1. Select the 1.5V or 9V BAT position using the function select switch.

2. Connect the red test lead to the positive side of the 1.5V or 9V battery and the

black test lead to the negative side of the 1.5V or 9V battery.

3. Read the analog display. The red display region indicates a weak (bad) battery,

the green display region indicates a good battery, and the ? region indicates that

the battery is on the verge of weakening.

Decibel (dB) Measurements

1. Set the function switch to the desired AC Voltage position.

2. Connect the test leads across the circuit under test.

3. For the 10V AC range, read dB directly from the analog scale.

4. For other ranges, calculate the measurement using the table below:

5. Circuits with dc component, require a capacitor between test leads and circuit.

dB Range -10 to 22dB 4 to 36 dB 24 to 56 dB

AC Range 10V 50V 500V

Add value to reading 0 14 34

Maintenance

WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove

the test leads from the input terminals and turn OFF the meter before opening the

case. Do not operate with open case. Install only the same type of fuse or equivalent

Cleaning and Storage

Periodically wipe the case with a damp cloth and mild detergent; do not use

abrasives or solvents. If the meter is not to be used for periods of longer than 60

days, remove the battery and store it separately

Battery and Fuse replacement

1. Remove the meter's protective holster

2. Remove the three rear Phillips head screws and open the meter case.

3. Replace the AA battery and/or fuse (500mA @250V, fast acting)

4. Re-assemble the meter

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of

defects in parts and workmanship for one year from date of shipment (a six month

limited warranty applies on sensors and cables). If it should become necessary to

return the instrument for service during or beyond the warranty period, contact the

Customer Service Department at (781) 890-7440 ext. 210 for authorization. A Return

Authorization (RA) number must be issued before any product is returned to

Extech. The sender is responsible for shipping charges, freight, insurance and

proper packaging to prevent damage in transit. This warranty does not apply to

defects resulting from action of the user such as misuse, improper wiring, operation

outside of specification, improper maintenance or repair, or unauthorized

modification. Extech specifically disclaims any implied warranties or merchantability

or fitness for a specific purpose and will not be liable for any direct, indirect, incidental

or consequential damages. Extech's total liability is limited to repair or replacement of

the product. The warranty set forth above is inclusive and no other warranty, whether

written or oral, is expressed or implied.

Repair and Calibration Services

Extech offers complete repair and calibration services for all Extech products.

For periodic calibration, NIST certification or repair of any Extech product, call

customer service for details on services available. Extech recommends that

calibration be performed on an annual basis to insure calibration integrity.

including the right of reproduction in whole or in part in any form.

38073 V1.3 9/00

Produkt Specifikationer

Mærke:	Extech
Kategori:	Multimeter
Model:	38073

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