Conrad VC 350E Mode D'emploi page 16

5. Power up the circuit to be measured (circuit, power, etc.) and
read the measured current. Whenever a "-"appears in front of
the measured value, this indicates a direct current or the mea-
sured value is negative or the test leads reversed.
Attention!
Do not measure any currents in circuits in which voltages greater
than 250 VDC or VAC rms can occur, so that the measuring device
is not damaged and your life is not endangered as a result. Under
no circumstances should currents over 20 A be measured. Measu-
rements should only be made in 16 A-fused current circuits or
those in which powers greater than 4000 VA cannot occur.
Measurements of currents equal to 20 A must only be measured
for a maximum of 10 s duration and must only be performed in
intervals of 15 minutes (cooling down phase for the shunt).
Current
source
6.3 Continuity checking and diode test
With this function voltage-free leads, fuses, circuits etc. can be
acoustically checked for continuity. This measurement is per-for-
med as follows:
1. Connect the red instrument lead with the V/Ω socket and the
black instrument lead with the COM socket.
2. Position the rotary switch to
30
DMM
A
Consuming
device,
load, circuit
/ . As a result the following
symbols appear in the display: "OL", "
symbols not appear, press the blue button once.
3. Then connect the test probes with the absolutely voltage-free
test points.
Depending on the circuit resistance present, the following acou-
stic signals are heard:
————————— (continuous tone) with 30 Ohm or less
— — — — — — — ("quickly"-interrupted tone) with more than
30 Ohm and less than 106 Ohm
————- ———- ("slowly"-interrupted tone) with more than
106 Ohm and less than 1700 Ohm
Attention!
Do not measure charged capacitors, as a possible discharge may
damage your measuring device.
The indicated measured value is not the "true" resistance value.
To establish this, a resistance measurement must be carried out
(as follows).
6.4 Resistance measurement
Attention!
Ensure that all circuitry components, circuits and structural ele-
ments to be measured, as well as other test objects, are comple-
tely voltage-free.
For measurement of voltage-free resistance up to max. 40 MOhm
proceed as follows:
" and "Ω". Should the
31