Voltage Measurement; Current Measurement - Conrad VC 350E Bedienungsanleitung

6.1 Voltage measurement

Attention!
The maximum permitted input value must not be exceeded under
any circumstances. MAX. 1000 VDC or max. 750 VAC rms.
Do not touch any circuits or circuitry components when measu-
ring voltages higher than 25 VACrms or 35 VDC. The measuring
instrument may only be used in installations of Overvoltage cate-
gory II.
To measure direct or alternating voltages, the procedure is as fol-
lows:
1. Connect the red instrument lead with the V/Ω socket and the
black instrument lead with the COM socket.
2. Set the rotary switch to the desired position (V) or, only for DC
voltage measurements, also to "mVDC".
3. Press the blue button according to whether DC voltage or AC
voltage is to be measured (except for mV DC). As soon as "AC"
appears in the display, the instrument is in AC measurement
mode.
4. Connect the test probes with the test object (load, circuit, etc.).
Attention!
Because the metal inserts of the socket contacts sit relatively dee-
ply (on grounds of safety), it is imperative that the measuring
lead plugs are inserted into the respective sockets up to their
stops. Make sure that the test lead plugs are securely connected
to the measuring instrument before a supposedly "0V" measure-
ment has been performed and circuit components then touched.
Attention!! Life can
ages of more than 25 VAC rms or 35 VDC are touched.
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be endangered if
Each of the voltage ranges, whether AC or DC, possess an input
impedance of 10 MOhm in parallel with < 100 pF). The AC volta-
ge input is AC-coupled. As soon as a "-" appears in front of the
measured value in a direct voltage measurement, the measured
voltage is negative (or the instrument leads are switched).
Notes
- Due to the fact that the measurement input is very sensitive, it
may be that certain measured values are displayed even with
test leads unconnected (not connected to a circuit). This occur-
rence is normal and will disappear as soon as measurements are
performed.
- In the "mV DC" measurement range, no "Auto Range" (auto-
matic range selection) is available.

6.2 Current measurement

To measure direct or alternating currents, procedure is as follows:
1. Connect the red test lead to the A or uA/mA socket and the
black test lead to the COM socket.
2. Position the rotary switch to current measurement (uA, 4000 uA
max.; or mA, 400 mA max.; or A, 20 A max). In the current mea-
suring range both automatic ("Auto Range") and manual range
selection ("R-H") is possible.
3. Press the blue button according to whether DC or AC current is
now to be measured. As soon as "AC" appears in the display,
alternating current mode is selected.
4. Open the unpowered circuit to be measured (switch off circuit
to be measured) and connect the test lead(s) in series with the
volt
unpowered circuit to be measured (see following diagram).
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