Conrad VC333 Bedienungsanleitung Seite 8

B AC voltage measurements
The maximum permitted input value of 600 VDC or
VAC rms max. electrically isolated from AC mains in
overvoltage category I or 300 VDC/AC rms max. in
overvoltage category II must not be exceeded un-
der any circumstances. Do not touch any circuits or
circuitry components when measuring voltages hig-
her than 25 VAC rms or 35 VDC.
For the measurement of AC currents proceed as follows:
1. Connect the red test lead with the V/Ohm socket and the black
test lead with the COM socket .
2. Set the required voltage measurement range with the rotary
switch. With AC voltage measurements (V~), 2 measurement
ranges are available: 200V and 600V.
3. Connect the test probes with the object to be measured (load,
circuit, etc.).
4. The measured value is shown in the display.
Both AC voltage measurement ranges offer an input impedance of
10 MOhm in parallel with < 20 pF (AC coupled).
Notes!
Because the measuring input is very sensitive, it may be that
with unconnected test leads (not connected with an object to
be measured) meaningless measured values can be displayed.
This "manifestation" is normal and disappears as soon as a
measurement is performed.
C Current measurement:
To measure DC current, proceed as follows:
1. Connect the black test lead to the COM socket and the red test
lead either to the mA socket if currents up to 200 mA max. are to
14
be measured, or to the 10A socket if currents between 200 mA
and 10A max. are to be measured.
2. Set the rotary switch to the required measurement range (200 µA
, 2000 µA, 20 mA, 200 mA or 10 A).
3. Connect the test leads in series with the test object (see figure
below).
Sicherung
– –
...
Strom-
quelle
Do not measure any currents in circuits in which
voltages greater than 35 V DC can occur. Never
measure currents greater than 10 A. Measure only
in circuits themselves fused at 10 A and in which
powers greater than 350 VA cannot occur.
Measurements of currents at 10 A may be for 10 s
duration max. and be carried out only at intervals of
15 minutes (shunt cooling phase).
D Resistance measurement
Ensure that all circuit components, circuits and as-
semblies and other objects to be measured are
completely voltage-free.
To perform a resistance measurement, proceed as follows:
1. Connect the black instrument lead with the COM socket and the
red instrument lead with the V/ohms socket.
Amperemeter/
Meßgerät
A
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