Elenco Electronics M-2625 Assembly instructions

OPERATOR’S
NSTRUCT ON MANUAL
M-2625
AUTO RANG NG
D G TAL MULT METER
with Temperature Probe
Copyright © 2007 Elenco®Electronics, Inc.

Contents
1. Safety Information 3,4
2. Safety Symbols 5
3. ront Plate of the Meter 5
Input Terminal 6
unction Rotary Switch 7
unction Press Button 8,9
LCD Display 10
4. Power On Option 11
5. Auto Power Off 11
6. Measurement Range 11
7. Making Measurements 12
Preparation 12
Measuring Voltage 12
Measuring DC Voltage 13
Measuring AC Voltage 14,15
Measuring Current 16
Measuring DC Current 17-19
Measuring AC Current 19-21
Measuring Resistance 21,22
Testing Diodes 23
Testing for Continuity 24
Measuring for Capacitance 25,26
Measuring requency 27
Measuring Duty Cycle 28,29
Measuring Temperature 29,30
8. Maintenance 31
Battery Replacement 31
use Replacement 32
9. General Specifications 33-35
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ntroduction
This series LCD auto ranging and auto power-off digital multimeter
is a portable, compact, 3¾ digit multimeter. It is ideally suited for
field, lab, shop, car, and home.
CAUT ON: Read, understand and follow all Safety Rules and
Operating Instructions in this manual before using this product.
1. Safety nformation
Use the meter only as specified in this manual. Otherwise, the
protection provided by the meter may be impaired. Refer to safety
information in Table 1.
Table 1. Safety nformation
Warning
To avoid possible electric shock or personal injury, follow these
guidelines:
• Do not use the meter if it is damaged. Before you use the meter,
inspect the case. Look for cracks or missing plastic. Pay particular
attention to the insulation surrounding the connectors.
• Inspect the test leads for damaged insulation or exposed metal.
Check the test leads for continuity. Replace damaged test leads
before you use the meter.
• The RESPONSIBLE BODY shall be made aware that, if the
equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
• Do not use the meter if it operates abnormally. Protection may be
impaired. When in doubt, have the meter serviced.
• Do not operate the meter around explosive gas, vapor, or dust.
• Do not apply more than the rated voltage, as marked on the meter,
between terminals or between any terminal and earth ground.
• Before use, verify the meter’s operation by measuring a known
voltage.
• When measuring current, turn off circuit power before connecting
the meter in the circuit. Remember to place the meter in series with
the circuit.
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!

Table 1. Safety nformation (continued)
Warning
• When servicing the meter, use only specified replacement parts.
• Use caution when working above 30VAC rms, 42V peak, or 60VDC.
Such voltages pose a shock hazard.
• Avoid working alone.
• When using the probes, keep your fingers behind the finger guards
on the probes.
• Connect the common test lead before you connect the live test lead.
When you disconnect test leads, disconnect the live test lead first.
• Remove test leads from the meter with the battery door or portions
of the cover removed or loosened.
• To avoid false readings which could lead to possible electric shock
or personal injury, replace the batteries as soon as the low battery
indicator ( ) appears.
• Use only type “AA” batteries or equivalent, properly installed in the
meter case, to power the meter.
• To avoid the potential for fire or electrical shock, do not connect the
thermocouples to electrically live circuits.
Caution
To avoid possible electric shock or personal injury, follow these
guidelines:
• Disconnect circuit power and discharge all high-voltage capacitors
before testing resistance, continuity, diodes, or capacitance.
• Use the proper terminals, function, and range for your
measurements.
• Before measuring current, check the meter’s fuses and turn power
O to the circuit before connecting the meter to the circuit.
-4-
!
+

2. Safety Symbols
Symbols used on the meter and in this manual are explained in
Table 2.
Table 2. nternational Electrical and Relative Symbols
3. Front Plate of Meter
Figure 1. Front plate of the meter
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~AC (Alternating Current) Important Information
~DC and AC
Caution, risk of electric shock
DC (Direct Current) Earth Ground
Equipment Safety Standard
Low Battery Indicator
Double Insulated
!
+
LCD Display
unction Press
Button
unction
Rotary Switch Input Terminal

nput Terminal
About terminal function refer to Table 3 and igure 2.
Figure 2. nput Terminal
Table 3. nput Terminal
Function Rotary Switch
About function rotary switch refer to Table 4 and igure 3.
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Terminal Function Description
/ / )/OF
V / ΩΩ/ Hz
Volts, ohm, diode, frequency, DUTY, temperature and
capacitance measurement, and testing for continuity terminal
mA Milliampere current, microampere current measurement terminal
COM Common terminal for all measurements
10A Ampere current measurement terminal

Figure 3. Function Rotary Switch
Table 4. Function Rotary Switch Symbols
-7-
Position of Switch Function
~VDC/AC voltage measurement
ΩΩResistance measurement, diode test, testing for continuity
)Capacitance measurement
Hz requency measurement / Duty cycle measurement

Table 4. Function Rotary Switch Symbols (continued)
Function Press Button
About press function button refer to igure 4.
Figure 4. Function Press Button
1. SELECT (state choice)
There are several functions at one rotary switch position; press the
SELECT button to select the desired function: ~V, ΩΩ , µµA~, mA~,
A~ range for AC or DC voltage, AC or DC current, resistance,
diode, or audible continuity measurement.
2. RANGE (range selection)
With the power on and the meter on the auto range mode, press the
RANGE button to select the desired measurement range manually.
The range goes from minimum to maximum by pressing the
RANGE button multiple times, and returns to minimum after
reaching the maximum range. Pressing and holding the RANGE
button for over two seconds returns the meter to auto range. This
button does not affect the frequency, capacitance, diode or
continuity range.
-8-
Position of Switch Function
OFTemperature measurement
µµA~DC/AC microampere current measurement
mA~DC/AC milliampere current measurement
A~DC/AC ampere current measurement
OFF Power off position

3. REL∆∆(relative measurement)
Press the REL∆∆button to use the relative measuring function and
a “REL∆” symbol appears on the LCD. The result of the relative
measurement is the difference between the measuring value and
the reference value. The reference value is produced the same as
the momentary value by press the REL∆∆button. Press the REL∆∆
button again to exit this function and the “REL∆” symbol disappears
from the display. This button does not affect the frequency, duty
cycle, diode and continuity test functions.
4. HOLD (data hold)
Pressing the HOLD button enables the data hold function and an
“ H ” symbol appears on the display. The momentary value appears
on the display. Press the HOLD button again to exit this function
and the “ H ” symbol disappears from the display. This button does
not affect the frequency measurement function.
5. Hz/DUTY
(frequency and duty cycle measurement switch button)
When making a frequency, DC or AC voltage measurement, press
this button to switch between the Hz or duty cycle test mode.
6. RESET (reset button)
Press this button to clear all values and to restart the meter.
LCD Display
About function rotary switch refer to Table 5 and igure 5.
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Figure 5. LCD Display
Table 5. LCD Display Symbols
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Sequ. No. Symbol Description
18.8.8.8 The display digit group
2–Negative symbol
3AC AC (alternating current) indicator
4Battery power is weakening
5RS232
Serial transmission (not used on this meter)
6Auto Auto range indicator
7REL∆∆Relative measurement
8Data hold
9Diode symbol
10 Audible continuity function indicator
11 hFE Transistor gain indicator (not used)
12 ΩΩ/ kΩΩ/ MΩΩ
Hz / kHz / MHz
Resistance units
requency units
+
H