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UNISource Corporation DM-1140B Operation Manual page 5

Bench type digital multimeter

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To get more accuracy, it's better to select the range which the reading is more than 10% of full range.
The max. input current is 2A or 20A (It decided by the COM of red test lead insert into), large current will
blow the fuse. Be careful when measuring 20A range, running large current will make the circuit heat, even
make the circuit damaged.
4-6. Resistance measurement
Connect the black one to "COM" terminal, the red test lead to VΩHz terminal.
Set the knob to Ω range; connect the test leads across to the resistance under measured.
NOTE:
If the resistance is larger than the value of selected range, "1" displays. Set the function knob to a higher
range. When the resistance is larger than 1MΩ, it will take a few seconds to be stable, it's normal in high
resistance measuring.
When the input terminal is in open circuit, OL displays.
When measuring resistance in-line, be sure that power of the circuit under measured is turned off and all
capacitors are released completely.
If big error occurs, perhaps it effected by other elements in –line or there resist voltage on the ends of this
resistance.
Do not input voltage at the resistance range!
4-7. Capacitance measurement
Set the knob to "F"range. Insert the capacitor under tested to "Cx" terminal according to the polarity,and turn on
the AC+DC measurement switch.
Connect test leads across to the two capacitors. It be careful the polarity.
NOTE:
Set the knob to a higher range when the LCD only displays "1" if the capacitance under tested exceeds the
max. value of selected ranges.
When pressing AC+DC switch before testing, the LCD will not display "0", which resulted in the higher
input value displaying. If AC+DC switch is at the state of jumping, LCD display the remnant data, which is
normal, won't affect the test result.
The LCD will not display stable data if it resists creep age badly or destroy the capacitance when measuring
at the higher capacitance range.
Release the capacitor completely to avoid damaging the meter before measuring.
4-8. hFE
Set the function knob to hFE range.
Be sure the transistor is NPN style or PNP style,insert the transmit polarity ,basic polarity, collector to the correct
COM.
4.9. Diode and continuity test
Connect the black one to "COM" terminal and the red test lead to VΩHz terminal(note: the polarity of the red
lead is +).
Set the function knob to
range, connect the test leads across to the diode (the red one connect anode
polarity), the reading is the value of forward voltage drop.
When measuring diode, if making continuity test, buzzer sounds when the resistance between the test leads is less
- 6 -
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
Range
200Ω
20kΩ
200kΩ
2MΩ
20MΩ
Open circuit voltage: less than 3V
Over load protection: 250V DC or AC peak value;
NOTE: At range 200 Ω, short-circuit the test leads to measure the wire resistance and then subtracts it from the
real measurement.
Capacitance (C)
Range
20nF
200uF
Measuring frequency: approx. 400Hz
Measuring voltage: approx. 40mV,
Overload protection: 36V DC or AC peak value
Frequency (FREQ.)
Range
20kHz
200kHz
Input sensitivity: 500mV rms
Overload protection: 250V DC or AC peak value(within 15s)
hFE measuring
Range
hFE NPN or PNP
Diode and continuity test
Range
TestEquipmentDepot.com
Accuracy
±(0.1%reading+20)
2kΩ
±(0.1%reading+5)
±(0.5%reading+5)
Accuracy
±(3.5%+20)
2uF
±(5%+30)
Accuracy
±(1.0%reading+20)
Displaying
Test condition
Base current is approx. 10μA,Vce is approx.
0~1000.0
3V.
Description
The measuring value is the approx. value Forward
- 3 -
Resolution
0.01Ω
0.1Ω
1Ω
10Ω
100Ω
1kΩ
Resolution
1pF
100pF
10nF
Resolution
1Hz
10Hz
Test condition
DCA
is

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