Dc And Ac Currents - Chauvin Arnoux C.A 5003 Manual De Empleo

AC VOLTAGES
~
V
10 V 30 V
Scale 100 30
Reading
x0.1 x1
coefficient
Internal
63.2 kΩ 200 kΩ 632 kΩ
(1)
resistance
(2)
Accuracy 2.5%
10Hz.. 10Hz.. 10Hz..
Bandwidht (3) 100 kHz 50 kHz 25 kHz
Permitted
overload 420V
Presence of direct component give false measurement.
DECIBELS
I 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:
N dB) (
U is the reference voltage of 0.775 V AC for a power P
o
on a load of 600Ω.
I Use. Zero level of the red scale in dB corresponds to U
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
+30dB on the 300V 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.
I 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.
100 V 300 V 1000 V
100 30 100
x1 x10 x10
2 MΩ 6.32 MΩ
2%
10Hz..
1 kHz
(4) (4)
1000 V 1500 V
( )
= 20 log U U
10 0
+20dB on the 100V AC range
+40dB on the 1000V AC range
(1) Specific R:
6.32 kΩ/V
(2) In % of
the end of scale
(3) See § 4
(4) For 15 seconds
of 1mW
o
= 0.775 for
o
13