Chauvin Arnoux CA850 Manual De Instrucciones página 13

By default, the CA 850 uses 80 psi as the calibration point. However, it can be set
between 78 and 82 psi. If the calibration source is not at 80 psi, adjust the calibration
point with the "DIF" button to increase and with the "back-lighting" button to reduce.
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 78 and 82 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 maximum display.
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