Extech 38073 Bedienungsanleitung
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.
Copyright © 2000 Extech Instruments Corporation. All rights reserved
including the right of reproduction in whole or in part in any form.
38073 V1.3 9/00
Produktspezifikationen
| Marke: | Extech |
| Kategorie: | Multimeter |
| Modell: | 38073 |
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