Elenco Compact Multimeter User Manual

Elenco®Electronics, Inc.
150 Carpenter Avenue
Wheeling, IL 60090
(847) 541-3800
Website: www.elenco.com
e-mail: elenco@elenco.com
INSTRUCTION MANUAL
DIGITAL MULTIMETER
M-1000D
Copyright © 2008 Elenco®Electronics, 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 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.
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.
6-2. Fuse Replacement
8
This meter is provided with a 250mA/250V fuse to protect 2000µA, 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
• 250mA/250V Bussman Fuse #GMA 250
• 250mA/250V Little Fuse #235-250
• 250mA/250V Elenco Fuse #533002
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6. Maintenance
Before attempting battery & fuse removal or replacement, disconnect the test leads from any energized circuits to avoid hazard.
6-1. Battery Replacement
Replace the battery when “BAT” appears on the display.
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.
Fuse
3. Close the case cover and secure it with the screws.
WARNING
+
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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.
FUNCTION INPUT JACK INPUT LIMITS
VDC V/& COM 1000VDC or 750Vrms AC VAC
/ / V/& COM 250Vrms @ 15 sec.
µA, mA DC
10A DC
• This digital multimeter is designed for indoor use only.
Refer to Section 4-2 on page 6 for complete specifications.
V/& COM 600VDC or 750Vrms AC
mA & COM 10A & COM
250mA DC
10A DC
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Safety Symbols
This marking adjacent to another marking, terminal, or operating device indicates that the operator must refer to the explanation in the
!
WARNING
CAUTION
500V max.
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/AC current, resistance, transistor, diode, audible continuity measurement and test signal. It is designed for technicians and students.
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Transistor hFE Measurement
1. Set the RANGE switch to the hFE position.
2. Determine whether the transistor is an NPN or
PNP-type and locate the Emitter, Base and Collector leads. Insert the leads into the proper holes of the h
FE socket on the front panel.
3. The meter will display the approximate hFE value at
the condition of base current 10µA and VCE 3V.
Audible Continuity Test
1. Plug the red test lead into the “V mA” jack and
the black test lead into the “COM” jack.
2. Set the RANGE switch to the position.
3. Connect the test leads to two points of the circuit to
be tested. If the resistance is lower than 100, the buzzer will sound.
Test Signal Use
1. Set the RANGE switch to the position.
2. A test signal of 50Hz appears between the “V
mA” and “COM” jacks. The output voltage is approximately 5Vpp with 50kimpedance.
Resistance Measurement
1. Plug the red test lead into the “V mA” jack and the black test lead into the “COM” jack.
2. Set the RANGE switch to the desired 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 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.
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3. Features
• 7 Functions / 17 Measuring Ranges
• 0.25% Basic Accuracy
• 1MInput Impedance
• Overload Protection
• Transistor Test
• Pocket Size
• Audible Continuity Test
• Test Signal Generator
4. Specifications
4-1. General Specifications
Display Polarity Overrange Indication “1” on LCD is displayed. Low Battery Indication Operation Temperature 32OF to 122OF Power 9V Alkaline or Carbon
Battery Life (typical)
Dimensions Weight Approximately 0.30 lb. Accessories Test Leads - 1 pair
3 1/2 LCD 1999 count display. Automatic “ ” is displayed.
BAT” sign on LCD readout.
Zinc battery (NEDA 1604) 100 hours w/ carbon zinc cells
200 hours w/ alkaline cells 5” (H) x 2 3/4” (W) x 7/8” (D)
Operator’s Manual
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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 + [number of least significant digits]).
DC Voltage
Range Resolution Accuracy
200mV 100µV+(0.25% of rdg+2dgt)
2000mV 1mV +
20V 10mV +(0.5% of rdg+2dgt)
200V 100mV +(0.5% of rdg+2dgt)
1000V 1V +(0.8% of rdg+2dgt)
OVERLOAD PROTECTION: 250Vrms AC for 200mV range and 1000VDC or 750Vrms AC for other ranges.
AC Voltage
Range Resolution Accuracy
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
Range Resolution Accuracy
2000µA1µA+(1% of rdg+2dgt)
20mA 10µA+
200mA 100µA+
10A 10mA +
OVERLOAD PROTECTION: 250mA 250V fuse (10A range unfused). MEASURING VOLTAGE DROP: 200mV.
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([% of reading] +
(0.5% of rdg+2dgt)
(1% of rdg+2dgt) (1.5% of rdg+2dgt) (3% of rdg+2dgt)
AC Voltage Measurement
1. Plug the red test lead into the “V 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 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.
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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 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.
Resistance
Range Resolution Accuracy
200 0.1 +(0.8% of rdg+2dgt)
2k 1 +
20k 10 +
200k 100 +
2000k 1k +
OVERLOAD PROTECTION: 15 seconds maximum 250Vrms on all ranges.
MAXIMUM OPEN CIRCUIT VOLTAGE: 3.2V.
(0.8% of rdg+2dgt) (0.8% of rdg+2dgt) (0.8% of rdg+2dgt) (1% of rdg+2dgt)
Audible Continuity
Range Description
Built-in buzzer sounds if resistance is
OVERLOAD PROTECTION: 250Vrms for a maximum of 15 seconds.
less than 100.
TR hFE
Range Test Condition Base Current
NPN 10µA DC @3.0V DC PNP 10µA DC @3.0V DC
DIODE TEST
Measures forward resistance of a semiconductor junction in kat max. test current of 1.5mA.
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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.
1
2
3
hFE Test Socket
4
5
6
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