Chauvin Arnoux C.A 6470, User Manual, Page: 49 / 140

47
4.4.3 MEASUREMENT & RESULTS
Each measurement result must be saved by pressing the
MEM
MR
MEM MEM
MR
key ; the results of the last 3
measurements are stored in the last OBJ:TEST number defined on the first measurement, with
extensions 1, 2 3 and 4.
Notes :
→ → → →
The OBJ:TEST number cannot be modified after the first measurement ;
→ → → →
once the first measurement has been triggered by pressing the « START/STOP »
pushbutton, no parameters (voltage, frequency) can be changed so long as the 3
measurements have not been completed. It is however possible, for the third measurement, to
use the cord compensation function (see below §4.2.2.2.) ;
→ → → →
the H and S electrodes must not be moved during the measurements.
Once the three measurements have been completed, the instrument calculates the coupling
coefficients and automatically stores them in the OBJ:TEST location in which the results of the three
measurements have been stored, with extension 4.
At the start of the measurement:
- the instrument measures U
S-E
and U
H-E
(and associated frequencies) : if U
S-E
and U
H-E
are
greater than 60V
peak
, the measurement is refused,
- the instrument checks the connections : if incorrect, the measurement is refused and the
faulty connection symbols flash,
- the instrument possibly measures, before the 3rd measurement, the cord compensation
resistance = R
∆
0.
- If a spurious voltage affects the accuracy of the measurement to be performed, the “NOISE”
symbol flashes.
During the measurement,
- if a voltage > 60 V
peak
is detected, the measurement is stopped.
Note :
If the measurement is unstable or the measurement results are inconsistent, trigger the measurement
to check that the problem is not a faulty connection.
On completion of measurements 1 and 2, the following quantities can be displayed using
the
DISPLAY
SMOOTH
DISPLAY DISPLAY
SMOOTH
key, and saved using the
MEM
MR
MEM MEM
MR
key.
If measurement is triggered by briefly
pressing START pushbutton
If measurement is triggered by pressing and
holding START pushbutton
R
1
or R
2
,
U
OUT
, f
measurement
U
S-E
, I
H-E
U
S-E
"NOISE"
(1)
and f , U
H-E
"NOISE"
(1)
and f
U
S-E
(2)
and f , U
H-E
(2)
and f
R
1
or R
2
, R
H
, R
S
U
OUT
, f
measurement
U
S-E
, I
H-E
U
S-E
"NOISE"
(1)
and f , U
H-E
"NOISE"
(1)
and f
U
S-E
(2)
and f , U
H-E
(2)
and f
(1)
Accessible only if spurious voltages are present which have affected the accuracy of the
measurement (“NOISE” symbol on steady).
(2)
possible voltage present (post-measurement) across terminals.
!
!
!