Circuit-test DMR-1000 Manuel Du Propriétaire page 4

NOTE: If you short the test leads together you will notice a small resistance value. This
is due to the meter and test leads internal resistance. When measuring a small
resistance subtract this value to obtain a more precise value.
4 DC CURRENT MEASUREMENT
WARNING: Remove all power from the circuit being tested when checking
current. When using 10A Scale, do not connect to circuit for more than 10 seconds.
4-1 Plug the red test lead into the mA jack and the black test lead into the COM jack.
Insert the red test lead into the 10A jack if current being measured is between 200mA
and 10A.
4-2 Set the range switch to one of the DCA current ranges. If you are unsure of the
amount of current being measured set switch to the highest reading and reduce until
a satisfactory reading is obtained.
4-3 Remove power from the circuit that is to be measured. Open up the circuit and
connect the black lead to the negative side and the red lead to the positive side of
the circuit so that the test leads are in series with the load to be measured.
4-4 Apply power to the circuit.
4-5 Read the displayed current.
NOTE: If changing range switch to or from the 10A position first disconnect power and
test leads from the circuit being tested. Repeat the above steps using the correct
input jack and range switch position.
5 TRANSISTOR HFE MEASUREMENT
5-1 Set the function switch to 'HFE'.
5-2 Insert the leads of the Emitter, Base and Collector of the transistor into the 'NPN' or
'PNP' socket.
5-3 Read the displayed transistor gain (HFE).
NOTE: The HFE reading is limited to the test current of the meter circuit. This may be
different than the published transistor data but will provide information as to whether
the transistor is functional.
6 DIODE TEST
WARNING: Remove all power from the circuit being tested when using the
diode check. Discharge any charged capacitors. Never connect the probes to any
voltage while the selector is set to
6-1 Plug the red test lead into the V jack and the black test lead into the COM jack.
6-2 Set the function switch to
6-3 Connect the probes to the device you want to test. Note the meter reading.
6-4 Reverse the probes and note this reading.
6-5 If both values are overrange 1, the device is open. If both values are very small the
device is shorted. If one reading indicates a small reading and the other is overrange
1, then the device is good.
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