Use; On/Off Function; Special Functions; Operation - Chauvin Arnoux C.A 41 Mode D'emploi

The rotary switch controls switching ON the C.A 41 and measurement with or without alarm.
It has three positions: OFF, V/m and V/m (AL).

ON/OFF FUNCTION

The OFF position of the rotary switch mechanically cuts off the power supply of the instrument.
Turning the switch to one of the two ON positions (V/m (AL) or V/m) applies the battery voltage
to the circuits of the instrument, for a duration of 10 minutes.
When switched ON with the rotary switch, all the segments of the display light up for 1 second.
The digital display (11), for three seconds also displays the remaining service life of the battery,
as a percentage of its maximum capacity.
A system for saving battery power switches the instrument OFF after 10 minutes, if :
. no buttons have been pressed,
. the rotary switched has not been turned.
Before this automatic switching OFF, the field meter emits a beep at 2 kHz for 65 ms, the
measurement display flashes for 1 minute then it switches OFF.
To switch ON again, either press any of the buttons, or turn the rotary switch to one of the
positions next to its OFF position. The display will light up again and the instrument will start
taking measurements again without taking into account the function of the button which was
pressed to switch it ON.

SPECIAL FUNCTIONS

There are special functions which can only be accessed when the field meter is switched ON
from the OFF position.
These functions are summarized in the table below.
If several buttons are pressed, none of the functions of these buttons are validated.
BUTTON
No button pressed Switched ON for 10 minutes
ON permanently
HOLD
Switched ON without buzzer
MIN MAX
(The
The alarm threshold can be accessed via the battery compartment.
PEAK
Press and hold throughout the adjustment procedure.

USE

FUNCTION
is shown on the display
P
symbol is not shown).
28

OPERATION

The C.A 41 has four buttons which provide access to specific functions for recording, filtering
or holding the measurement value.
Each press on a button sets off a beep at 2 kHz for 65 ms. In all cases, the response time for
one press is less than 50 ms.
RECORDING OF MIN, MAX and AVG:
The MIN MAX button allows recording of the minimum, maximum and average values of
the measurement. A brief press (less than 2 seconds) on this button places the instrument in
record mode (the RECORD symbol lights up).
The RECORD and P symbols on the display mean that the instrument is in permanent
recording mode (the AUTO OFF function is not in operation).
MIN value
When is pressed the displayed value is memorised in the MIN register.
MIN MAX
Each time that a measurement is less than that contained in the register, it is transferred
into the MIN register and a 1 kHz beep is emitted for 125 ms.
MAX value
A measurement value greater than that contained in the memory will update it.
At each modification of the MAX memory, a 2 kHz beep is emitted for 125 ms.
AVG value*
Initially, the memorised value is zero. The instrument inputs the digital value every
second, then it takes the sum of all the values input since the start of the record
instruction and divides the total by the number of seconds that have passed.
The result (the average value) is stored in memory.
Thus the contents of the AVG memory are reset every second.
Readout of the MAX, MIN and AVG memories
The display of the values contained in the MIN, MAX and AVG registers is produced
by successive presses on
MIN MAX
The circular display successively indicates the maximum value reached (MAX symbol),
the minimum value reached (MIN symbol), the average value (AVG symbol) then the
current value of the measurement.
Switching OFF the MIN, MAX and AVG functions
The MIN, MAX and AVG recording functions are switched OFF by pressing the
button for more than 2 seconds (1 kHz beep for 250 ms).
MIN MAX
*AVG : AVERAGE
.
29