Model Q 1074A - OPERATION MANUAL
5
pressing the button always. Press
MAX/MIN
more than 2 seconds button again to exit this mode and
“ MAX ” / ” MIN ” symbol disappear on display. This button do not effect on diode and continuity test
function, capacitance measurement, frequency measurement.
2.2 Check the 9-volt battery.
If the battery is weak, a “
" symbol will appear on the left of the display. It means that the
battery should be replaced.
2.3 DC and AC Voltage measurement
1) Connect the black test lead to "
COM
" socket and red test leads to the
“V
/
Ω/
/Hz
"
socket.
2)
Set the selector switch to “
V
” or or "
mV
position, and press
SELECT
to select DCV or
ACV measuring mode.
3) Connect the probes across the source or load under measurement.
2.4 DC and AC Current measurement
1) Connect the black test lead to "
COM
" socket and red test leads to the
“uA
/
mA
"socket.
2) For measurement up to 6000uA. Set the selector switch to
“
uA
” position and press
SELECT
button to select DC or AC current measuring mode.
3) For current measurement from 6mA to 600mA. Set the selector switch to
“
mA
” position
and press
SELECT
button to select DC or AC current measuring mode.
4) For current measurement from 600mA to 10A, connect the red test lead to "
10A
" socket. Set
selector switch to “
AC/DC 10A
” position and press
SELECT
button to select DC or ACA
measuring mode.
5) Connect the probes across the source or load under measurement.
Note1: Not to measure a current in a circuit with voltage more than 600V at uA/mA/10A.
2.5 Resistance measurement
1) Connect the black test lead to "
COM
" socket and red test leads to the
“
V
/
Ω/
/Hz
"
socket.
2) Set the selector switch to "
" position
3) Connect the probes across circuit to be tested.
Caution: Ensure that the circuit to be tested is "dead". Max. input over-load: 250V RMS and
<10sec.
2.6 Diode, continuity test
1) Connect the black test lead to "
COM
" socket and red test leads to the "
V/
Ω/
/Hz
"
socket.
2) Set the selector switch
to “
”
position and press
SELECT
button to select Diode
or continuity
test mode.
3) Connect the black and red test probe to the cathode (-) and anode (+) ends of diode to be
tested respectively.
4) Read the forward voltage drop (junction) value from the display. If reverse connected the
probes to diode, display shows over-load.
5) In Continuity test, the beeper sounds continuously if the resistance is less than 120
approximately.
Caution: Ensure that the circuit to be tested is "dead". Max. input over-load: 250V RMS and
<10sec.
