Measurements With Contact; Measurements With External Input - Chauvin Arnoux C.A 25 Mode D'emploi

MEASUREMENTS WITH CONTACT

The mechanical adaptor is an accessory which is placed in front of the sighting
window of the optical sensor. It transforms the optical measurement without
contact into a measurement with contact on the moving part.
There are three different accessories available :
- a rubber cone with a tip allowing measurements at the end of shafts on axles
down to 5 mm diameter.
- a rubber cylinder for measurement at the end of a flat shaft or with axles less than
5 mm diameter due to hollowing.
- a rubber wheel for measurement of the linear speed
(1 revolution of the wheel = 0.1 m).

MEASUREMENTS WITH EXTERNAL INPUT

The instrument has a 4 contact plug for connection to an alternative external source
for measurement of the speed, frequency, periodicity, duty %...
In order to inform the tachometer that the measurement is being made at the
external input it is necesary to short circuit pins 1 and 4.
Operation on external input is indicated on the display by the suppression of the
emission symbol
Wiring
2
3
FRB mâle conne-
ctor of the tacho-
meter seen from
the contact side.
and the display of EXT.
. . . .
1
4
1- Ground
2- Measurement positive (max 20 V)
3- See next page
4- Short circuit with pin n°1
55