Tenma 72-7730A, Руководство по эксплуатации, Страница: 36 / 69

35
D. Testing for Continuity
Warning
Do not apply voltage to the test leads while the
meter is in the Continuity measurement mode.
To test for continuity, set up the Meter as Figure 3-4
and do the following:
Insert the red test lead into the terminal and the
black test lead into the
COM terminal.
Set the rotary switch to ; press BLUE button
to select measurement mode and connet the
test leads across with the object being tested.
The beeper comes on continuously for open
conditions, The beeper will sound for conditions of
less than
50 .
1.
2.
3.
The BLUE button cycles among resistance, continuity,
and diode.
To avoid possible damages to the Meter or to the
devices under test, disconnect circuit power and
discharge all the high-voltage capacitors before
measuring continuity.
Note
When measuring low resistance, the test leads can
add 0.1 to 0.2 of error to resistance measurement.
To test the leads, touch the probe tips together and
read the resistance of the leads. If necessary, you
can press REL to automatically subtract this value.
For high-resistance measurement (>1 ), it normally
requires several seconds to obtain a stable reading.
In order to obtain precision readings, use the test
lead as short as possible.
The LCD displays OL indicating open-circuit or the
tested resistor value is higher than the maximum
range of the Meter.
When testing the resistance signal from the calibrator,
it is necessary to press and hold the RANGE while
turning on the Meter to change the maximum display
to 4000 counts but the accuracy remains unchanged.
When resistance measurement has been completed,
disconnect the connection between the test leads
and the circuit under test and remove test leads from
the input terminals of the Meter.
Model 72-7730A/72-7732A: OPERATING MANUAL