OPERATOR’S
INSTRUCTION MANUAL
DIGITAL MULTIMETER
M-1000B
Copyright © 2003 ElencoTMElectronics, Inc.
Contents
1. Safety Information 3
2. Introduction 4
3. Features 5
4. Specifications 5
4-1 General Specifications 5
4-2 Measurement Specifications 6, 7
5. Operation 8
5-1 Preparation and Caution before Measurement
8
5-2 Front Panel Description 8, 9
5-3 How to Make Measurements 10-13
6. Maintenance 14
6-1 Battery Replacement 14
6-2 Fuse Replacement 15
! WARNING !
PLEASE READ THIS INSTRUCTION
MANUAL CAREFULLY
Misuse and/or abuse of this instruction cannot be
prevented by any printed word and may cause
injury and/or equipment damage.
Please follow all these instructions and
measurement procedures faithfully, and adhere to
all standard industrial safety rules and practices.
-2-
1. Safety Information
To ensure that the meter is used safely, follow all of
the safety and operation instructions in this manual. If
the meter is not used as described in the manual, the
safety features of the meter might be impaired.
• Do not use the meter if the meter or the test leads look
damaged, or if you suspect that the meter is not operating
properly.
• Turn off the power to the circuit under test before cutting,
unsoldering, or breaking the circuit. Small amounts of current
can be dangerous.
• Use caution when working above 60VDC or 30VAC rms.
Such voltages pose a shock hazard.
• When using the test lead, keep your fingers behind the
guards on the test lead.
• Disconnect the live test lead before disconnecting the
common test lead.
• To avoid damage to the meter, do not exceed the input limits
shown below.
• This digital multimeter is designed for indoor use only.
Refer to Section 4-2 on page 6 for complete specifications.
FUNCTION INPUT JACK INPUT LIMITS
VDC V/W & COM 1000VDC or 750Vrms AC
VAC
V/W & COM 1000VDC or 750Vrms AC
W / V/W & COM 220Vrms @ 15 sec.
mA, mA DC
10A DC
mA & COM
10A & COM
200mA DC
10A DC
-3-
Safety Symbols
This marking adjacent to another marking, terminal,
or operating device indicates that the operator must
refer to the explanation in the operating instructions
to avoid damage to the equipment and/or to avoid
personal injury.
This WARNING sign denotes a hazard. It calls
attention to a procedure, practice or the like, which if
not correctly performed or adhered to, could result in
personal injury.
This CAUTION sign denotes a hazard. It calls
attention to a procedure, practice or the like, which, if
not correctly adhered to, could result in damage to or
destruction of part or all of the instrument.
This marking 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 (in this case) 500 volts.
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 instrument and its test leads
should not be handled when these terminals are
energized.
This marking indicates that equipment is protected
completely be the double insulation.
2. Introduction
This meter is a 3 1/2 digit digital multimeter that is rugged,
reliable and convenient to use, while providing all of the
accuracy and features needed for any application. It
performs DC/AC voltage, DC current, resistance,
transistor, and diode. It is designed for technicians and
students.
!
WARNING
CAUTION
500V max.
-4-
3. Features
• 6 Functions / 19 Measuring Ranges
• 0.25% Basic Accuracy
• 1MW Input Impedance
• Overload Protection
• Transistor Test
• Pocket Size
4. Specifications
4-1. General Specifications
Display
3 1/2 LCD 1999 count display.
Polarity Automatic “ ” is displayed.
Overrange Indication “1” on LCD is displayed.
Operation Temperature 32
O
F to 122OF
Power 9V Alkaline or Carbon Zinc
battery (NEDA 1604)
Battery Life (typical)
100 hours w/ carbon zinc cells
200 hours w/ alkaline cells
Dimensions 5” (H) x 2 3/4” (W) x 7/8” (D)
Weight Approximately 6 oz.
Accessories Test Leads - 1 pair
Operator’s Manual
-5-
4-2. Measurement Specifications
Accuracy of specifications apply for 1 year after purchase when
operated in a temperature of 18OC to 28OC (64OF to 82OF) and a
relative humidity of less than 75%.
Basic electrical specifications are given as +([% of reading] +
[number of least significant digits]).
DC Voltage
200mV 100mV+(0.5% of rdg+2dgt)
2000mV 1mV +
(0.5% of rdg+2dgt)
20V 10mV +(0.5% of rdg+2dgt)
200V 100mV +(0.5% of rdg+2dgt)
1000V 1V +(0.8% of rdg+2dgt)
OVERLOAD PROTECTION: 220Vrms AC for 200mV range and
1000VDC or 750Vrms AC for other ranges.
AC Voltage
200V 100mV +(1.2% of rdg+10dgt)
750V 1V +(1.2% of rdg+10dgt)
OVERLOAD PROTECTION: 1000VDC for 750Vrms for all ranges.
RESPONSE: Average responding, calibrated in rms of a sine wave.
FREQUENCY RANGE: 45Hz - 450Hz
DC Current
200mA.1mA+(1% of rdg+2dgt)
2000mA1mA+
(1% of rdg+2dgt)
20mA 10mA+
(1% of rdg+2dgt)
200mA 100mA+
(1.2% of rdg+2dgt)
10A 10mA +
(2% of rdg+2dgt)
OVERLOAD PROTECTION: 200mA 250V fuse (10A range unfused).
M
EASURING VOLTAGE DROP: 250mV.
Range Resolution Accuracy
Range Resolution Accuracy
Range Resolution Accuracy
-6-
Resistance
200W 0.1W +(0.8% of rdg+2dgt)
2kW 1W +
(1% of rdg+2dgt)
20kW 10W +
(1% of rdg+2dgt)
200kW 100W +
(1% of rdg+2dgt)
2000kW 1kW +
(1% of rdg+2dgt)
OVERLOAD PROTECTION: 15 seconds maximum 220Vrms on
all ranges.
MAXIMUM OPEN CIRCUIT VOLTAGE: 2.8V.
TR hFE
NPN 10mA DC @3.0V DC
PNP 10mA DC @3.0V DC
DIODE TEST
Measures forward resistance of a semiconductor
junction in kW at max. test current of 1.5mA.
-7-
Range Resolution Accuracy
Range Test Condition Base Current
5. Operation
5-1. Preparation & Caution Before
Measurement
1. The function switch should be set to the range to be
measured before operation.
If the function must be switched during a
measurement, always remove the test leads from
the circuit being measured.
2. If the unit is used near noise-generating equipment,
be aware that the display may become unstable or
indicate large errors.
3. Avoid using the unit in places with rapid temperature
variations.
4. In order to prevent damage or injury to the unit,
never fail to keep the maximum tolerable voltage and
current, especially for the 10A current range.
5. Carefully inspect the test leads. If damaged, discard
and replace.
6. Be sure to check the annunciator on the display for
safety indicator.
5-2. Front Panel Description
1. Liquid Crystal Display
2. Function/Rotary Switch
3. TR hFE Test Socket
4. 10A Input Jack
5. Plug-in Connector for Red (positive) Test Lead.
6. Plug-in Connector for Black (negative) Test Lead.
-8-
1
2
6
3
5
4
-9-
5-3. How to Make Measurements
WARNING
1. To avoid electrical shock hazard and/or damage to
the meter, do not measure voltages that might
exceed 500V above earth ground.
2. Before using the instrument, inspect the test leads,
connectors, and probes for cracks, breaks, or grazes
in the insulation.
DC Voltage Measurement
1. Plug the red test lead into the “V W mA” jack and the
black test lead into the “COM” jack.
2. Set the RANGE switch to the desired DCV position.
If the voltage to be measured is not known
beforehand, set the switch to the highest range and
reduce it until a satisfactory reading is obtained.
3. Connect the test leads to the device or circuit being
measured.
4. Turn on the power of the device or circuit being
measured. The voltage value will appear on the
digital display along with the voltage polarity.
-10-
AC Voltage Measurement
1. Plug the red test lead into the “V W mA” jack and the
black lead into the “COM” jack.
2. Set the RANGE switch to the desired ACV position.
3. Connect the test leads to the device or circuit being
measured.
4. Turn on the power of the device or circuit being
measured. The voltage value will appear on the
digital display.
DC Current Measurement
1. Plug the red test lead into the “V W mA” jack and the
black test lead into the “COM” jack (for
measurements between 200mA and 10A, connect
the red test lead to the “10A” jack. Make sure that
the test leads are pushed all the way into the jack).
2. Set the RANGE switch to the desired DCA position.
3. Open the circuit to be measured and connect the
test leads IN SERIES with the load in which current
is to be measured.
4. Read the current value on the digital display.
-11-
Resistance Measurement
1. Plug the red test lead into the “V W mA” jack and the
black test lead into the “COM” jack.
2. Set the RANGE switch to the desired W position.
3. If the resistance being measured is connected to a
circuit, turn off the power and discharge all
capacitors before measuring.
4. Connect the test leads to the circuit to be measured.
5. Read the resistance value on the digital display.
Diode Measurement
1. Plug the red test lead into the “V W mA” jack and the
black test lead into the “COM” jack.
2. Set the RANGE switch to the position.
3. Connect the red test lead to the anode of the diode
to be measured and the black test lead to the
cathode.
4. The forward voltage drop in mV will be displayed. If
the diode is reversed, the number “1” will be
displayed.
-12-
Transistor hFE Measurement
1. Set the RANGE switch to the hFE position.
2. Determine whether the transistor is an NPN or PNPtype and locate the Emitter, Base and Collector
leads. Insert the leads into the proper holes of the
hFE socket on the front panel.
3. The meter will display the approximate hFE value at
the condition of base current 10mA and VCE 2.8V.
-13-
6. Maintenance
6-1. Battery Replacement
1. Remove the two screws on the case cover. Then,
detach it from the top case.
2. Unsnap the battery from the connector and replace
it with a new 9 volt battery.
3. Close the case cover and secure it with the
screws.
-14-
WARNING
Before attempting battery & fuse removal or
replacement, disconnect the test leads from any
energized circuits to avoid hazard.
+
–
6-2. Fuse Replacement
This meter is provided with a 200mA/250V fuse to
protect 200mA, 2000mA, 20mA, 200mA ranges.
NOTE: The 10A circuit is not fused.
1. Turn off the power.
2. Remove the two screws from the back of the case.
3. Remove the fuse from the holder and replace it with
a new fuse of the specified value.
Fuse Numbers
• 200mA/250V Bussman Fuse #GMA 2/10
• 200mA/250V Little Fuse #235-200
• 200mA/250V Elenco Fuse #530020
-15-
CAUTION
Failure to turn off the DMM before installing
the battery could result in damage to the
meter if the battery is connected to the
battery terminal incorrectly.
Elenco
TM
Electronics, Inc.
150 W. Carpenter Avenue
Wheeling, IL 60090
(847) 541-3800
http://www.elenco.com
e-mail: elenco@elenco.com
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