Dc And Ac Voltages (V Dc And Ac); Decibels (Db) - Chauvin Arnoux C.A 5003 Manual De Empleo

3 - DC AND AC VOLTAGES
Connect the leads to the multimeter and connect in parallel to the
circuit to be tested.
When the order of magnitude is not known, place the switch on the
highest range then progressively lower to the appropriate range.
To get the voltage in V, multiply the value read on the appropriate
scale by the reading coefficient shown in the table.
V DC 100 mV
Scale
Reading
x1
coefficient
Internal
2 kW
(3)
resistance
(4)
Accuracy 2,5 %
Permitted
overload
(1) Common to the 50 mA DC range
(3) Specific R: 20 kW /V, except range 1000 V-R = 6.32 kW /V
(4) In % of the end of scale
V AC
Scale
Reading
coefficient
Internal
(1)
resistance
(2)
Accuracy
(3)
Bandwidth
Permitted
overload
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 is the reference voltage of 0.775 V AC for a power P
o
on a load of 600 W .
Use. Zero level of the red scale in dB corresponds to U
the 10 V AC range. The reading is direct in dB for the 10 V AC range
from 0 to +22 dB. For the other ranges, it is possible to read in dB (near
value) by adding respectively:
+10dB on the 30 V AC range
+30dB on the 300 V AC range
(1)
1 V
100 100
(2)
x0,01
20 kW 63,2 kW 200 kW 632 kW
440 V
10 V 30 V
100 30
x0,1 x1
63,2 kW 200 kW 632 kW
3 %
100 kHz 50 kHz 25 kHz
1000 V
4 - DECIBELS
N dB) (
3 V 10 V
30 100
x0,1 x0,1
(2) Direct reading in mV DC
(5) For 15 seconds
100 V 300 V
100 30
x1 x10
2 MW
2,5 %
(4)
(
= 20 log U U
10
+20dB on the 100 V AC range
+40dB on the 1000 V AC range
30 V 100 V 300 V 1000 V
30 100
x1 x1
2 MW 6,32 MW 6,32 MW
1,5 %
(5)
1000 V
1000 V
100
(1) Specific R:
x10
(2) In % of
6,32 MW
(3) From 10 Hz to ...
1 kHz
(4) For 15 seconds
(4)
1500 V
)
0
30 100
x10 x10
(5)
1500 V
6.32 kW /V
the end of scale
of 1 mW
o
= 0.775 for
o
1 3