Extech 38070 Bruksanvisning
Extech
Multimeter
38070
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User’s Guide
Analog Multimeter
Model 38070
Introduction
Congratulations on your purchase of the Extech model 38070 Analog
Multimeter. This device measures AC/DC Voltage, DC Current, Resistance,
and dB, displaying measurements in analog format. Properly used, this meter
will provide many years of reliable service.
WARNING: USE EXTREME CAUTION IN THE USE OF THIS DEVICE.
Improper use of this device can result in injury or death. Follow all safeguards
suggested in this manual in addition to the normal safety precautions used in
working with electrical circuits. DO NOT service this device if you are not
qualified to do so.
Safety Instructions
This meter has been designed for safe use, but must be operated with caution.
The rules listed below must be carefully followed for safe operation.
1. NEVER apply voltage or current to the meter that exceeds the specified
maximum:
Input Protection Limits
Function Maximum Input
V DC or V AC 500V AC and DC
mA DC 500mA DC
Resistance 50V DC/AC
2. USE EXTREME CAUTION when working with high voltages.
3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds
500V above earth ground.
4. NEVER connect the meter leads across a voltage source while the
function switch is in the current or resistance mode. Doing so can
damage the meter.
5. ALWAYS discharge filter capacitors in power supplies and disconnect the
power when making resistance tests.
6. ALWAYS turn off power and disconnect test leads before opening the
covers to replace the fuse or battery.
7. NEVER operate the meter unless the back cover and the battery and fuse
covers are in place and fastened securely.
8. If the equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
Safety Symbols
This symbol adjacent to another symbol, terminal or operating
device indicates that the operator must refer to an explanation
in the Operating Instructions to avoid personal injury or damage
to the meter.
This WARNING symbol indicates a potentially hazardous
situation, which if not avoided, could result in death or serious
injury.
This CAUTION symbol indicates a potentially hazardous
situation, which if not avoided, may result damage to the
product.
This symbol advises the user that the terminal(s) so marked
must not be connected to a circuit point at which the voltage
with respect to earth ground exceeds 500V.
This symbol adjacent to one or more terminals identifies them
as being associated with ranges that may, in normal use, be
subjected to particularly hazardous voltages. For maximum
safety, the meter and its test leads should not be handled when
these terminals are energized.
This symbol indicates that a device is protected throughout by
double insulation or reinforced insulation.
Controls and Jacks
1. Scale
2. Pointer
3. Scale zero adjust
4. Ohms zero adjust
5. Rotary function switch
6. Positive V, mA and input jack
7. COM input jack
Specifications
Function Range Accuracy
DC Voltage 500V
± 4% of full scale
250V
50V
10V
AC Voltage
(50/60Hz)
500V
± 5% of full scale
250V
50V
10V
DC Current
250mA
± 4% of full scale 50Ma
0.5mA
Resistance Rx10 (10,000 ± 5% of full scale
Rx1k (1,000,000
Decibels -10 to +56 dB (4 ranges) 0dB=1mW in 600
Max input voltage 500V AC/DC
Input Sensitivity, 2kV
Frequency Range 50/60Hz
Battery 0ne (1) 1.5V AA battery
Fuse 500mA/250 fast blow (5mmx20mm)
Operating Temperature 41 oF to 104oF (5oC to 40oC)
Storage Temperature 14 oF to 122oF (-10oC to 50oC)
Operating Humidity Max 80% up to 87ºF (31ºC) decreasing linearly to
50% at 104ºF (40ºC)
Storage Humidity <80%
Operating Altitude 7000ft. (2000meters) maximum.
Weight 3.88oz (110g)
Size 3.82x3.34x1.3” (97x65x33mm)
Safety For indoor use and in accordance with the
requirements for double insulation to IEC1010-1
(1995): EN61010-1 (1995) Overvoltage Category II
500V, Pollution Degree 2. UL, CE Approved
1
2
3
4
5
6
7
WARNING
CAUTION
MAX
500V
SupportLines:U.S.(877)439 (603) 324‐8324;International:+1 ‐7800
Technical ‐Support: Option 3; E mail: support@extech.com
Repair & Returns:Option4; ‐E mail: repair@extech.com
Productspecificationsare subject tochangewithoutnotice
Please ‐ ‐visit our website for the most up to date information
www.extech.com
FLIRCommercialSystems,Inc.,9 Townsend West, Nashua, NH 03063
USA
ISO9001Certified
Battery Installation
WARNING: To avoid electric shock, always turn off the power and
disconnect the test leads before opening the back to replace the fuse or
battery.
1. Remove the screws securing the rear cover using a Phillips head
screwdriver.
2. Lift the cover off and replace the battery observing the correct polarity.
3. Insert the new battery into the battery holder.
Replace the rear cover and secure with the screws. WARNING: To avoid
electric shock, do not operate the meter until the battery cover is in place
and fastened securely.
NOTE: If your meter does not work properly, check the fuses and battery to
make sure that they are still good and that they are properly inserted.
Operating Instructions
WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are
very dangerous and should be measured with great care.
1. ALWAYS turn the function switch to the OFF position when the meter is not
in use.
DC VOLTAGE MEASUREMENTS
CAUTION: Do not measure DC voltages if a motor on the circuit is being
switched ON or OFF. Large voltage surges may occur that can damage
the meter.
1. Set the function switch to the highest V DC position.
2. Insert the black test lead banana plug into the
negative (COM) jack.
Insert the red test lead banana plug into the positive
(V) jack.
3. Touch the black test probe tip to the negative side of
the circuit.
Touch the red test probe tip to the positive side of the
circuit.
4. Read the voltage in the display. Reset the function
switch to successively lower V DC positions to obtain
a higher scale reading.
DC CURRENT MEASUREMENTS
1. Insert the black test lead banana plug into the negative
(COM) jack.
2. Set the function switch to the 250mA DC position and
insert the red test lead banana plug into the (mA) jack.
3. Remove power from the circuit under test, then open up
the circuit at the point where you wish to measure
current.
4. Touch the black test probe tip to the negative side of
the circuit.
Touch the red test probe tip to the positive side of the
circuit.
5. Apply power to the circuit.
6. Read the current in the display. Reset the function
switch to successively lower mA positions to obtain a higher scale reading.
AC VOLTAGE MEASUREMENT
WARNING: Risk of Electrocution. The probe tips may not be long enough
to contact the live parts inside some 240V outlets for appliances because
the contacts are recessed deep in the outlets. As a result, the reading may
show 0 volts when the outlet actually has voltage on it. Make sure the
probe tips are touching the metal contacts inside the outlet before
assuming that no voltage is present.
CAUTION: Do not measure AC voltages if a motor on the circuit is being
switched ON or OFF. Large voltage surges may occur that can damage
the meter.
1. Set the function switch to the highest V AC position.
2. Insert the black test lead banana plug into the
negative (COM) jack.
Insert red test lead banana plug into the positive (V)
jack.
3. Touch the black test probe tip to the negative side
of the circuit.
Touch the red test probe tip to the positive side of
the circuit.
4. Read the voltage in the display. Reset the function
switch to successively lower V AC positions to
obtain a higher scale reading.
RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit under
test and discharge all capacitors before taking any resistance
measurements. Remove the batteries and unplug the line cords.
1. Set the function switch to the X10 or X1K position.
2. Insert the black test lead banana plug into the negative
(COM) jack
Insert the red test lead banana plug into the positive
jack.
3. Touch the test probe tips together and adjust the OHM
Zero Adjust knob for a “0” reading.
4. Touch the test probe tips across the circuit or part under
test. It is best to disconnect one side of the part under
test so the rest of the circuit will not interfere with the
resistance reading.
5. Read the resistance on the scale
dB MEASUREMENTS
The dB scale can be used to measure the milliwatt power dissipation on a
600Ω load by measuring the voltage across a 600 Ω load. An AC voltage of
0.775Vrms across 600Ω is equal to 1mW or “0”dB When converting an AC
Voltage measurement to dB take the dB reading from the lowest arc on the
scale plate and then add the appropriate dB correction found in the table
below.
ACV ADD dB
10 0 -10 ~ 22
50 14 4 ~ 36
250 28 18 ~ 50
500 34 24 ~ 56
Maintenance
WARNING: To avoid electric
source of voltage before rem
covers.
WARNING: To avoid electric
battery and fuse covers are
This MultiMeter is designed to
following care instructions are
1. KEEP THE METER DRY
2. USE AND STORE THE
Temperature extremes c
distort or melt plastic pa
3. HANDLE THE METER
damage the electronic p
4. KEEP THE METER CLE
cloth. DO NOT use chem
5. USE ONLY FRESH BAT
TYPE. Remove old or w
unit.
6. IF THE METER IS TO B
the batteries should be r
UL LISTED
The UL mark does not indicat
accuracy of its readings.
Warranty
FLIRSystems,Inc.warrantsthis
inpartsand workmanship for on
warranty sensorsappliesto and
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Service Department forauthoriza
information. Return AAuthoriza
returned.Thesenderisresponsib
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Calibration,Repair,a
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Copyright©
Allrightsreservedincludingthe
ww
Produktspecifikationer
| Varumärke: | Extech |
| Kategori: | Multimeter |
| Modell: | 38070 |
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