Chauvin Arnoux C.A 43 FILEDMETER Mode D'emploi page 86

This figure corresponds to 80 measurements of 250µs. To get the 250µs measurement,
you must therefore divide the figure obtained by 80.
The measurement becomes 316352/80 = 2802.4
The measurement thus calculated must be linearised according to the following formula to get
the true measurement:
The coefficients a and b are given in the table below, they depend on the type of probe used,
which can be found from the probe code given by reading the state of the instrument.
In the example used above, if the coefficient a is 1.893 x 10
is 7.300, the real measurement becomes :
2802.4 x 0.001893 + 7.300 = 12.60V/m
Each probe code contains 6 linearisation slopes whose coefficients depend on the measurement.
The table below indicates the number of the linearisation table allocated to each of the 17
probe codes.
Probe code
from 255 to 251
from 250 to 237
from 236 to 223
from 222 to 209
from 208 to 195
from 194 to 181
from 180 to 167
from 166 to 153
from 152 to 139
from 138 to 125
from 124 to 111
from 110 to 97
from 96 to 83
from 82 to 69
from 68 to 55
from 54 to 41
from 40 to 27
from 26 to 0
Measurement = Xa + b
Linearisation table number
Measurement blocked
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
84
-3 i.e. 0.00163 and coefficient b
Measurement unit
Display ANT
V/m
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