CHAUVIN ARNOUX CA-5003 [13/44] N db u u log 20

CHAUVIN ARNOUX CA-5003 [13/44] N db u u log 20
13
AC VOLTAGES
Presence of direct component give false measurement.
DECIBELS
Reminder. The measurement of an AC voltage can be expressed
in decibels (symbol dB). The decibel is the ratio of two quantities or
levels. Level N, in dB, of a voltage U has the mathematical expression:
U
o
is the reference voltage of 0.775 V AC for a power P
o
of 1mW
on a load of 600.
Use. Zero level of the red scale in dB corresponds to U
o
= 0.775 for
the 10V AC range. The reading is direct in dB for the 10V AC range
from 0 to +22dB. For the other ranges, it is possible to read in dB (near
value) by adding respectively:
+10dB on the 30V AC range +20dB on the 100V AC range
+30dB on the 300V AC range +40dB on the 1000V AC range
DC AND AC CURRENTS
Always switch off the circuit to test before connecting the
multimeter to the circuit. If the “Fus.” light comes on, change the
faulty fuse(s) (Reminder: minimum voltage of 110V).
Connect the leads to the multimeter and connect in series to the
circuit with:
- the red lead in the “µmA” terminal, up to 1.5mA
- the red lead in the “15A” terminal, from 1.5A to 15A
Switch off the power supply to the circuit before changing range.
To get the current in µA, mA or A, multiply the value read on the
appropriate scale by the reading coefficient shown in the table.
(1) Specific R:
6.32 k/V
(2) In % of
the end of scale
(3) See § 4
(4) For 15 seconds
(
)
N dB) U U( log= 20
10 0
V
~
10 V 30 V 100 V 300 V 1000 V
Scale 100 30 100 30 100
Reading
coefficient
x0.1 x1 x1 x10 x10
Internal
resistance
(1)
63.2 k 200 k 632 k 2 M 6.32 M
Accuracy
(2)
2.5% 2%
10Hz.. 10Hz.. 10Hz.. 10Hz..
Bandwidht
(3)
100 kHz 50 kHz 25 kHz 1 kHz
Permitted
overload 420V 1000 V
(4)
1500 V
(4)

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