Model VC940: OPERATING MANUAL
11
z
When the measured current is between 5A-10A, continuous measurement
≤
10 seconds and interval more than 15 minutes.
z
When current measurement has been completed, disconnect the connection between the testing leads and the circuit under test and remove testing leads away from the
input terminals of the Meter.
C.
Measuring Resistance
Black
Red
Figure 3-3. Resistance Measurement
Warning
To avoid harms to you, please do not attempt to input voltage higher than 60V DC or 30V rms AC.
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
resistance.
To measure resistance, set up the Meter as shown in Figure 3-3 and follow the following procedure:
1. Insert the red test lead into the
Ω
terminal and the black test lead into the
COM
terminal.
2. Set the rotary switch to
Ω
; press
BLUE
button to select
Ω
measurement mode.
3. Connect the test leads across with the object being measured.
The measured value shows on the display.
The
BLUE
button cycles among resistance, continuity, and diode.
Note:
z
When measuring low resistance, the test leads can add 0.1
Ω
to 0.2
Ω
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.
z
For high-resistance measurement (>1M
Ω
), it is normal taking several seconds to obtain a stable reading. In order to obtain precision readings, use the test lead as short
as possible.
z
If
Ω
reading with shorted test leads is not
≤
0.5
Ω
, check for loose test leads, wrong function selected or other causes.
z
The LCD displays
OL
indicating open-circuit or the tested resistor value is higher than the maximum range of the Meter.
z
When resistance measurement has been completed, disconnect the connection between the testing leads and the circuit under test and remove testing leads away from
the input terminals.
D.
Testing for Continuity
Black
Red
Figure 3-4. Continuity Test
Warning
To avoid harms to you, please do not attempt to input voltage higher than 60V DC or 30V rms AC.
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.
To test for continuity, set up the Meter as Figure 3-4 and do the following:
1.
Insert the red test lead into the
Ω
terminal and the black test lead into the
COM
terminal.
2.
Set the rotary switch to
Ω
; press
BLUE
button to select
measurement mode and connet the test leads across with the object being tested.
3.
The beeper comes on continuously for open conditions, that is test resistance
≤
50
Ω
.
The
BLUE
button cycles among resistance, continuity, and diode.
Note
z
Open circuit voltage around –1.2V and range is 400
Ω
measurement range.
z
When continuity testing has been completed, disconnect the connection between the testing leads and the circuit under test and remove the test leads away from the
input terminals
.
E.
Testing Diodes
Содержание VC940
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