Extech Instruments 38070, User Manual

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Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451
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
Ω
input jack
7. COM input jack
Specifications
Function Range Accuracy
500V
250V
50V
DC Voltage
10V
± 4% of full scale
500V
250V
50V
AC Voltage
(50/60Hz)
10V
± 5% of full scale
250mA
50Ma
DC Current
0.5mA
± 4% of full scale
Rx10 (10,000 Ω) Resistance
Rx1k (1,000,000
Ω)
± 5% of full scale
Decibels -10 to +56 dB (4 ranges)
0dB=1mW in 600
Ω
Max input voltage
500V AC/DC
Input Sensitivity,
2k
Ω/
V
Frequency Range
50/60Hz
Battery
0ne (1) 1.5V AA battery
Fuse
500mA/250 fast blow (5mmx20mm)
Operating Temperature
41
o
F to 104
o
F (5
o
C to 40
o
C)
Storage Temperature
14
o
F to 122
o
F (-10
o
C to 50
o
C)
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