Morris 57074 Bedienungsanleitung
C
¡£
C
¡£
RS232
uAmA
OFF
ON
RANGE
10A
mV
V
V
DC
AC
SELECT
AUTO
OFF
1000V
Hz
V
COM
1000V
700V
uA
mA
A
RS232
Hz
F
°
LIGHT
DUTY
ON
%
Hz
mF
V
A
u
n
Mk
HOLD
Hz
°C
REL
CAT III
3 3/4 Digit Multimeter
Model 57074
Users Manual
Table of Content
Introduction ………………………………………………………………………………………….. 1
Unpacking and Inspection ………………………………………………………….………….… 2
Safety Precautions …………………………………………………………………….……………. 2
A Quick Tour …………………………………………………………………………….………….… 2
Symbol Explanation …….…………………………………………………………………….… 6
Instrument Layout ……………………………………………………….………….…………… 7
Functions of Keys ……………………………………………………………….…….………… 9
Others …………………………………………………………………………………..……….. 11
Making Measurements ……………………………………………………………………………. 13
Measuring AC or DC Volts …………………………………………………………..……….. 13
Measuring DC or AC Current …………………………………………………………….… 14
Measuring Resistance ………………………………………………………………………… 16
Measuring Capacitance …………………………………………………………………..…… 18
Measuring Frequency and Duty ……………………………………………………………. 19
Measuring Temperature ……………………………………………………………..………… 20
Testing Diode ……………………………………………………………….………………… 21
Testing Continuity ………………………………………………………………….………… 22
Specifications ………………………………………………………..……..…………………… 23
General Specifications ……………………………………………………………...………… 23
Accuracy and Resolution ……………………………………………………………………… 24
Maintenance …………………………………………………………………..…………………… 28
Replacing the battery ………………………………………………………….……………… 28
Replacing the Fuse ……………………………………………………………..…………… 29
Others …………………………………………………………………………………………… 30
RS232C serial data output ……………………………………………….……………………… 30
3 3/4 Digit Multimeter
Users Manual
- 1 -
Introduction
This is a high performance, low power consumption and 3 3/4 digits (4000 Counts)
mutimeter. The meter is made with a large integrated circuit. Includes manual and auto range
and all functions and ranges are protected for overload. Measures AC/DC voltage, AC/DC
current, resistance, diode, continuity, capacitance, frequency, duty and temperature.
Unpacking and Inspection
Unpacking and removing the meter. If parts are missing or damaged, please contact the
distributor.
Multimeter 1
User manual 1
Test leads 1
Thermocouple 1
RS232C interface 1
Software CD 1
3 3/4 Digit Multimeter
Users Manual
- 4 -
Safety Information
The meter has been designed according to IEC1010-1 concerning safety requirements for
electrical measuring instruments with an over voltage category (1000V CAT.Ⅲ) & pollution 2.
WARNING:
READ “SAFETY INFORMATION” AND “WARNING
INFORMATION” BEFORE USING THIS MULTIMETER!
3 3/4 Digit Multimeter
Users Manual
- 4 -
Safety Precautions
Injury or death can occur even with low voltages and low current. It is extremely important
that you read this safety information before using your multimeter. Follow all safety practices
and proper operating procedures for equipment being tested.
Exercise extreme caution: Measuring voltage above 20V, measuring current greater that
10mA, measuring AC power line with inductive loads, measuring AC power line during
electrical storms.
Always inspect your multimeter test leads for signs of damage or abnormality before
every use. If any abnormal conditions exist (i.e.: broken or damaged test leads, cracked
case, display not reading, etc.), do not attempt to take measurements.
Never ground yourself when taking electrical measurements. Do not touch exposed metal
pipes, outlets, fixtures, etc., which might be at ground potential. Keep your body isolated
from ground by using dry clothing; rubber shoes, rubber mats, or any approved insulating
material.
Never touch exposed wiring, connections, test probe tips, or any live circuit conductors
when attempting to make measurements.
Never replace the protective fuse inside the multimeter with a fuse other than the
specified or approved equal fuse. Replace only with same type of fuses. To avoid
electrical shock, disconnect the test leads and any input signals before replacing the
fuses.
Replace only with same type of battery. To avoid electrical shock, disconnect the test
3 3/4 Digit Multimeter
Users Manual
- 4 -
leads and any input signals before replacing the battery.
Do not operate this multimeter in an explosive atmosphere (i.e., in the presence of
flammable gases or fumes, vapor or dust.).
Measuring voltage that exceeds the limits of the multimeter may damage the meter and
expose the operator to a shock hazard. Always recognize the multimeter voltage limits on
the front of meter.
Never apply more than 1000 DCV or 700ACV between the COM jack and earth ground.
Never touch a voltage source when the test leads are plugged into a current jack.
When testing for the presence of voltage or current, make sure the voltage or current
ranges are functioning correctly. Take a reading of a known voltage or current before
assuming a zero reading indicates no current or voltage.
Do not attempt calibration or service unless trained and another person capable of
rendering first aid and resuscitation is present.
3 3/4 Digit Multimeter
Users Manual
- 5 -
A Quick Tour
1. Symbol Explanation
Attention! Low Battery
Dangerous Voltage! Fuse
Ground European union
directives
AC Double Insulation
DC
A Quick Tour
Instrument Layout
- 6 -
2. Instrument Layout
①.LCD
②.Keys: select measuring function
③.Function/Range selector rotary switch
④.10A input terminal: This is positive input terminal
for measuring 10A current, which connect with the
red test lead.
⑤.μA/mA/°C input terminal: This is the positive
input terminal for measuring 400mA current and
temperature, which connect with the red test lead.
⑥. COM input terminal: This is the negative input
terminal for all measurement modes, which connect
with the black test lead.
⑦.Hz/V/Ωinput terminal: This is the positive input
terminal for voltage, resistance, duty, frequency,
capacitance, diode and continuity, which connect with the
red test lead.
700V
1000V
1000V
CAT II
ON
OFF
COM
C
¡£
VHz
uAmA10A
RS232
ON
OFF
V
V
mV
Hz
C
¡£
uA
mA
A
DUTY LIGHT
SELECT Hz HOLD
RANGE
AUTO
AC
DC
RS232
kM
n
u
AV
F
m
Hz
REL
%
¡ã
F
C
¡ã
3 3/4 Digit Multimeter
Users Manual
- 7 -
3. Keys Function
SELECT (Function Switch): Select is the function selecting key that acts with trigger. Use
the key as measuring functions select.
RANGE (Auto/Manual Range): This key is the auto/manual key. Power on default is auto
measurement, and press one time to switch to the manual measurement. In manual
measurement mode, the system will jump up one mode for each press until the highest
mode, then return to the lowest mode as a loop. If you press the key over 2 seconds, the
system will switch back to auto measurement status. Frequency and capacitance
measurement cannot use manual measurement.
REL (Relative Value Measurement): Rel key is the relative value measurement key.
Except Hz/Duty, Diode and Continuity, other functions can do the relative value
measurement.
Hz/DUTY (Frequency/Duty Cycle): Hz/Duty is the frequency/Duty Cycle select key. In
frequency measurement mode, press the key can select frequency or duty cycle
measurement mode; in AC/DC voltage or AC/DC current mode, press the key can
proceed to voltage, Frequency, Duty cycle or Current, Frequency, Duty cycle
measurement mode select.
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