7
D.
Alternating current (A V scale)
1.
Set knob Sk
2
to position "~".
2.
Set knob Sk
1
to position "3 A" (highest current range, to
prevent damage to the meter) and connect the measuring
leads to the s and -.
3.
Now connect the measuring leads to the current circuit to
be measured and then set knob Sk
1
that measuring
position that is most suitable to provide an accurate
reading of the current in question.
E.
Resistance (Ω scale)
1.
Select the appropriate resistance range with knob Sk
2
(x 1
Ω, x 100 Ω or x 10 kΩ); knob Sk
1
may be in any position.
2.
Connect the measuring leads to the sockets + and - and
short-circuit the free ends of these leads.
3.
Check the zero setting of the indicator (to the right on the
scale) and, if necessary, correct with knob R. if it is found
impossible to adjust the indicator to 0 Ω, this means that
the batteries are runned down and have to be replaced (see
under REPLACEMENT OF BATTERIES).
4.
Now connect the ends of the measuring leads to the
resistor to be measured.
5.
After switching over to another resistance range the
measuring leads must always be short-circuited and the
indicator set to exactly 0 Ω.
Note:
When measuring a resistor within an apparatus, make sure that the
resistor is disconnected from impedances or voltages.
dB SCALE
The dB scale is based on the use of the measuring. range 0
- 3 V. The zero level is fixed at 0.775 V, which corresponds to 1 mW across
600 Ω. In the case of a greater measuring range, the dB value can be
determined if the value read from the dB scale is increased by 12 dB for the
range 0 - 12 V, 20 dB for 0 - 30 V, 32 db for 0 - 120 V, 40 db for 0-300 V
and 52 db for 0 - 1200 V.
