Chauvin Arnoux C.A 852 Notice De Fonctionnement page 13

„ Record the calibration point by pressing the "REC" button. "SA" appears on the screen after 2 seconds.
The pressure gauge then switches automatically to adjustment of the negative pressure.
„ Follow the same calibration procedure for the negative pressure.
„ Record the calibration point again. After 2 seconds, "END" and "CA" appear on the screen and the
pressure gauge then returns to the measurement mode.
If you cannot record the calibration point using the "REC" button, the "SA" symbol is not displayed;
check that:
- the pressure calibration source is between 1.5 and 1.7 psi
- you have connected the correct input: positive or negative
If you want to go directly to calibration of the negative input, press the "UNIT" button.
4.5. «STANDBY» MODE
The instrument is switched off automatically after approximately 20 minutes without any activity.
For long monitoring periods, you can deactivate the "standby" mode by pressing the "power" and
"HOLD" buttons simultaneously when the instrument is switched off. An "n" is displayed on the screen:
"standby" mode is deactivated. The next time you switch on the pressure gauge, the "standby" mode
will be reactivated.
4.6. ERRORS: CAUSES AND ACTION
No display:
Check that the battery is connected correctly and that it's charge is sufficient.
If the screen display disappears, check that "standby" mode is not activated.
BAT display:
There may be measurement errors. Replace the battery.
Err. 1 :
When the pressure is greater than the upper limit of the measurement range, "Err. 1" is displayed on
the screen.
Err. 2 :
When the pressure is less than the lower limit of the measurement range, "Err. 2" appears on the screen.
Err. 3 :
When you are in "differential measurement mode", "Err. 3" is displayed if the differential pressure value
is larger than the maximum display.
Err. 4 :
When you set the zero, make sure that no pressure is applied. Otherwise, "Err. 4" appears on the screen.
If "Err. 4" appears on the screen even when no pressure is applied, it means that the sensor is damaged
(see § 6 Repairs).
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