for forward voltage drop. When the
resistance under tested is less than
30
Ω
±10
Ω
, buzzer sounds and display the
approx. value. The open circuit voltage is
approx. 3V.
approx.
1mA,
backward DCV is
less than 3V.
Overload protection: 250V DC and AC peak value.
4. OPERATION
4-1. PANEL DESCRIPTION
HOLD
AC+DC
GROUNDING CONDUCTOR IN POWER CORD
MUST BE CONNECTED TO ENSURE
PROTECTION FROM ELECTRICAL SHOCK.
WARNING
CAUTION
FOR FIRE PROTECTION REPLACE ONLY WITH:
200mA SLOW FUSE,100/120V
100mA SLOW FUSE,220/240V
1. LCD 2. Power switch 3. Function knob 4. V
Ω
Hz input terminal
5. COM 6. Current (<2A) input terminal and 2A fuse socket 7. 20A current input terminal
8. Backlight switch 9. Hold switch 10. AC+DC measuring switch 11. hFE plug
12. Capacitance measuring plug 13. Bracket
14. 110V/220V selector switch 15. Fuse 16. Power plug
The meter is driven by 220V or 110V AC voltage. The voltage is set on 220V when leave factory. If the local line
voltage is 110V, please set the line voltage to 110V by the selector switch on rear panel.
When operating, first connect the power line to power plug, then turn on the power.
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N
OTE:
Before connecting the circuit under measured, be sure that the measured value should not exceed the limit
specified in front panel.
4-2 DCV measurement
Connect the black test lead to “COM” terminal and the red one to “V
Ω
Hz” terminal.
Set the function knob to
range, connect the test leads across to the circuit under measured, the polarity will
be displayed with the voltage reading value.
NOTE:
If the voltage under measured is unknown beforehand, start from the highest range and work down.
If only MSD displays “1”, it means over range, should set to a higher range.
Do not input a voltage over 1000V
，
otherwise, the circuit might be damaged.
Be careful when measuring high voltage circuit.
4-3 ACV measurement
Connect the black test lead to “COM” terminal and the red one to “V
Ω
Hz” terminal.
Set the function knob to
range, connect the test leads across to the circuit under measured.
NOTE:
If the voltage under measured is unknown beforehand, start from the highest range and work down.
If only MSD displays “1”
，
it means over range, should set to a higher range.
To get more accuracy, it’s better to select the range which the reading is more than 10% of full range.
Do not input a voltage over 1000Vrms
，
otherwise, the circuit might be damaged.
Be careful when measuring high voltage circuit.
4-4. DCA measurement
Connect the black test lead to “COM” terminal and the red one to "mA" terminal
（
max.2A
）
or “20A” terminal
(max. 20A).
Set the function knob to
range, connect the test leads across to the circuit under measured, the polarity will
be displayed with the voltage reading value.
NOTE:
If the current under measure is unknown beforehand, start from the highest range and work down.
If only the MSD displays“1”, it means over range, should set to a higher 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.
4-5. ACA measurement
Connect the black test lead to “COM” terminal and the red one to "mA" terminal
（
max. 2A
）
or “20A” terminal
(max.20A).
Set the knob to
range, connect the test leads across to the circuit under measured.
NOTE:
If the current under measure is unknown beforehand, start from the highest range and work down.
If only the MSD displays“1”, it means over range, should set to a higher range.
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
