Alarm Button - Chauvin Arnoux C.A 6541 Notice De Fonctionnement

Note : If during DAR or PI measurement (automatic or not), a high external interference voltage
becomes present, or the insulation resistance goes off the device's measurement range, then
the DAR or PI measurements are interrupted and the screen indicates:
Note : The 10 min/ 1 min measurement durations for PI calculation can be modified in the SET-
UP menu (see § 4.7), allowing adaptation to possible changes in standards or to suit a particular
application.
I I I I I Second function R (t)
The R(t) button is used to access the interval insulation resistance values as a function of time, after a
measurement in "Time-controlled test" mode
The time between each saved sample is programmed in the SET-UP menu.
This function is also available on model C.A 6541 which has neither a read-write memory for saving
measured data, nor an interface for data retrieval from the instrument by a PC.
On the C.A 6541, up to 20 samples can be recorded by the instrument during
sampling at the rate chosen in SET-UP (the default value is 30 seconds).
It is possible to save more than 20 samples, available processing memory space permitting.
On the C.A 6543, the number of samples that can be saved is only limited by the read-write memory
space available.
After pressing the R(t) button, the instrument is in display mode:
- the small display indicates the time 00:30 (if the sampling frequency is 30 s)
- the main display shows the corresponding R value.
Using the V-TIME button it is possible to alternate between the time and voltage (on the small display),
associated with the R value on the main display.
L
The button is used to scroll down through the all the samples saved during measurement. This makes
M
it possible to read off the information in order to draw out R(t) and an V(t) graphs.
This makes it possible to carry out R(t) analysis on-site, without a printer or a PC.
Pressing the R(t) or the R-DAR-PI again exits from this function
6 6 6 6 6
4.4

/ ALARM Button

6
I I I I I First function
This function allows the display back-light to be turned on or off.
I I I I I Second function ALARM
Activates/deactivates the ALARM function. The corresponding symbol is displayed when activated.
If this function is activated and the high or low threshold value programmed in the SET-UP menu is
crossed, the ALARM symbol flashes and the buzzer (if activated) sounds continually.
It is possible to program a different limit in each function and these limits will be stored in memory after
the device is switched off.
DAR MΩ
or
PI MΩ
(see § 4.2).
43
measurement when