OPERATING INSTRUCTIONS SAFETY INFORMATION SPECIFICATIONS

Display: 3 3/4 digit liquid crystal display (LCD) with a

ELENCO LCM-1950 The following safety information must be observed to insure
maximum personal safety during the operation of this meter: maximum reading of 3999.

DIGITAL MULTIMETER Polarity: Automatic, positive implied, negative polarity

1. Do not use the meter if the meter or test leads look damaged, indication.
or if you suspect that the meter is not operating properly.
Overrange: (OL) or (–OL) is displayed.
2. This meter is not recommended for high voltage industrial
Zero: Automatic.
use; for example, not for measurements of 440VAC or
600VAC industrial power mains. The unit is intended for Low Battery Indication: The “ + ” is displayed when the
use with low energy circuits to 1000VDC or 750VAC or high battery voltage drops below the
energy circuits to 250VAC or DC. Accidental misuse by operating level.
connection across a high voltage, high energy power source Measurement Rate: 2.5 times per second, nominal.
when the meter is set up for mA measurement may be very Operating Environment: 0OC to 50OC at <70% relative
hazardous. humidity.
3. Turn off power to the circuit under test before cutting, Storage Temperature: –20OC to 60OC, 0 to 80% R.H. with
unsoldering, or breaking the circuit. Small amounts of battery removed from meter.
current can be dangerous.
Accuracy: Stated accuracy at 23OC +5OC, <75% relative
4. Use caution when working above 60VDC or 30VAC rms. humidity.
Such voltages pose a shock hazard.
Power: Single standard 9-volt battery, NEDA 1604, JIS 006P,
5. When using the probes, keep your fingers behind the finger IEC 6F22.
guards on the probes.
Battery Life: 150 hours typical with carbon-zinc.
6. Measuring voltage which exceeds the limits of the
Dimensions: 200mm (H) x 90mm (W) x 40mm (D).
multimeter may damage the meter and expose the operator
to a shock hazard. Always recognize the meter voltage Weight: Approx. 14 oz. (400g.) including battery.
limits as stated on the front of the meter. Accessories: One pair test leads, one spare fuse (installed), 9V
battery (installed) and operating instructions.

DC VOLTS RESISTANCE
Ranges: 400mV, 4V, 40V, 400V, 1000V Ranges: 400W, 4kW, 40kW, 400kW, 4MW, 40MW, 4000MW
Resolution: 100mV Accuracy: +(1.0% rdg + 4 dgts) on 400W range
Accuracy: +(0.5% rdg + 1 dgt) +(0.8% rdg + 2 dgts) on 4kW to 4MW ranges
+(3.0% rdg + 4 dgts) on 40MW range
Input Impedance: 10MW
+[(5.0% rdg + 10 dgts) + 10 dgts] on 4000MW range
Overload Protection: 1000VDC or 750VAC rms
Open Circuit Volts: 0.6VDC (3.0VDC on 400W and
4000MW ranges)
AC VOLTS (50Hz - 500Hz)
Overload Protection: 500VDC or AC rms
Ranges: 400mV, 4V, 40V, 400V, 750V
Resolution: 100mV CONTINUITY
Accuracy: +(1.5% rdg + 4 dgts) on 400mV to 400V ranges Audible Indication: Less than 40W +20W
+(2.0% rdg + 4 dgts) on 750V ranges
Overload Protection: 500VDC or AC rms
Input Impedance: 10MW
Overload Protection: 1000VDC or 750VAC rms DIODE TEST
Test Current: 1.0mA +0.6mA
DC CURRENT
Accuracy: +(3.0% rdg + 3dgt)
Ranges: 40mA, 400mA, 10A
Open Circuit Volts: 3.0VDC typical
Accuracy: +(1.5% rdg + 1 dgt) on mA range
Overload Protection: 500VDC or AC rms
+(3.0% rdg + 1 dgt) on 10A range
Input Protection: 0.5A / 250V fast blow fuse CAPACITANCE
10A / 600V fast blow ceramic fuse
Ranges: 4nF, 40nF, 400nF, 4mF, 200mF
AC CURRENT (50Hz - 500Hz) Accuracy: +(5.0% rdg + 10dgts) on all ranges
+(8.0% rdg + 10dgts) above 100mF
Ranges: 40mA, 400mA, 10A
Test Frequency: 200Hz
Accuracy: +(2.0% rdg + 4 dgts) on mA range
+(3.5% rdg + 4 dgts) on 10A range
Input Protection: 0.5A / 250V fast blow fuse
10A / 600V fast blow ceramic fuse
INDUCTANCE OPERATION Voltage Measurements Resistance and Continuity Measurements
Ranges: 4mH, 40mH, 400mH, 4H, 40H Before taking any measurements, read the Safety Information
1. Connect the red test lead to the “VW” jack and the black test 1. Set the Function/Range switch to the desired resistance
lead to the “COM” jack. range or continuity position.
Accuracy: +(5.0% rdg + 20 dgts) on 4mH Section. Always examine the instrument for damage,
+(5.0% rdg + 10 dgts) on other ranges contamination (excessive dirt, grease, etc.) and defects. 2. Set the Function/Range switch to the desired range and press 2. Remove power from the equipment under test.
Examine the test leads for cracked or frayed insulation. If any the “ /~” switch to toggle between the desired voltage type.
Test Frequency: 200Hz 3. Connect the red test lead to the “VW” jack and the black test
abnormal conditions exist, do not attempt to make any If the magnitude of the voltage is not known, set the switch lead to the “COM” jack.
FREQUENCY (Autoranging) measurements. to the highest range and reduce until a satisfactory reading is
4. Touch the probes to the test points. In ohms, the value
obtained.
Ranges: 4kHz, 40kHz, 400kHz, 1000kHz indicated in the display is the measured value of resistance.
Max. Hold Feature 3. Connect the test leads to the device or circuit being In continuity test, the beeper sounds continuously, if the
Accuracy: +(0.5% rdg + 1 dgt) on all ranges Press “MAX” to toggle in and out of the Maximum Hold mode measured. resistance is less than 100W.
Sensitivity: 0.2V rms min. (holding the highest reading). In the MAX mode, the MAX 4. For DC, a (–) sign is displayed for negative polarity; positive
Overload Protection: 500VDC or AC rms annunciator is displayed and maximum reading is stored in polarity is implied. Transistor Gain Measurements
display register. If the new reading is higher than the reading
1. Set the Function/Range switch to the desired hFE range (PNP
LOGIC TEST being displayed, the higher reading is transferred to the display Current Measurements
register. A “higher” reading is defined as the reading with the or NPN type transistor).
Threshold: Logic Hi (2.8 +0.8V) 1. Set the Function/Range switch to the desired current range and
higher absolute value. 2. Never apply an external voltage to the hFE socket. Damage
Logic Lo (0.8 +0.5V) press the “ /~” selector switch to the desired current type. to the meter may result.
Indication: 40 msec beep at logic low The MAX hold function is also available in the frequency count
2. For current measurements less than 400mA, connect the red 3. Plug the transistor directly into the hFE socket. The sockets
mode. The counter autoranging feature is disabled when the
Frequency Response: 20MHz test lead to the “mA” jack and the black test lead to the are labeled E, B, and C for emitter, base and collector.
MAX hold function is selected.
“COM” jack.
Detectable Pulse Width: 25nS. 4. Read the transistor hFE (DC gain) directly from the display.
3. For current measurements over 400mA or greater, connect
Pulse Limits: >30% & <70% duty
the red test lead to the “10A” jack and the black test lead to
Overload Protection: 500VDC or AC rms the “COM” jack.
TRANSISTOR hFE 4. Remove power from the circuit under test and open the
normal circuit path where the measurement is to be taken.
Ranges: 0 - 1000 Connect the meter in series with the circuit.
Base Current: 10mADC approx. (Vce = 3.3VDC)

Capacitance & Inductance Measurements Diode Tests MAINTENANCE

1. Set the Function/Range switch to the desired Cx 1. Connect the red test lead to the “VW” jack and the black test
(capacitance) or Lx (inductance) range. lead to the “COM” jack. WARNING
2. Never apply an external voltage to the Cx/Lx sockets. 2. Set the Function/Range switch to the “ ” position. Remove test leads before changing battery or
Damage to the meter may result. performing any servicing.
3. Turn off the power to the circuit under test.
3. Insert the capacitor or inductance leads directly into the 4. Touch the probes to the diode. A forward-voltage drop is Battery Replacement
Cx/Lx sockets. about 0.6V (typical for a silicon diode).
Power is supplied by a 9 volt “transistor” battery (NEDA 1604,
4. Read the capacitance or inductance directly from the display. 5. Reverse the probes. If the diode is good, the display will be IEC 6F22). The “ + ” appears on the LCD display when
between 2.800V and 3.200V. If the diode is shorted, “.000” replacement is needed. To replace the battery, remove the two
Frequency Measurements of another number is displayed. screws from the back of the meter and lift off the battery cover.
1. Set the Function/Range switch to the KHz position. 6. If the diode is open, the display will be between 2.800V and Remove the battery from the battery snap.
2. Connect the red test lead to the “VW” jack and the black test 3.200V in both directions.
lead to the “COM” jack. 7. If the junction is measured in a circuit and a low reading is Fuse Replacement
3. Connect the test leads to the point of measurement and read obtained with both lead connections, the junction may be If no current measurements are possible, check for a blown
the frequency from the display. shunted by a resistance of less than 1kW. In this case, the overload protection fuse. There are two fuses; F1 for the “mA”
diode must be disconnected from the circuit for accurate jack and F2 for the “10A” jack. For access to fuses, remove the
Logic Measurements testing. two screws from the back of the meter and lift off the battery
cover. Replace F1 only with the original type 0.5A/250V, fast
1. Set the Function/Range switch to the LOGIC position.
acting fuse. Replace F2 only with the original type 10A/600V,
2. Connect the red test lead to the “VW” jack and the black test fast acting ceramic fuse.
lead to the “COM” jack.
3. Connect the red test lead to the test point and the black lead
to the common buss of the logic circuit.
4. A “ ” on the display indicates TTL logic high and a “ ”
indicates a TTL logic low. Both indicators are on when the
point of measurement is toggling high and low.