The [CAL] Key
Chapter Four: Functional Overview
60
The [CAL] Key
The [
CAL
] key presents the calibration information and performs the calibration functions.
The message “
CALIBRATING
” appears on the screen and the channel selector lights extinguish
while the 670 instrument performs a calibration procedure. The current value of the entry is
listed in the top portion of the screen.
The Null and Full Scale calibrations are performed independently of the pressure transducer.
Perform the Null calibration procedure any time the value changes from 0.0000 Volts. Perform
the Full Scale calibration procedure whenever the full scale value drifts from 10.000 Volts.
Note
When the 670 instrument requires recalibration, run the Null procedure
first, followed by the Full Scale procedure, if necessary. Both the Null
and Full Scale values effect the output signal voltage.
Null
NULL
-0.0001 Volts
Press ENTER to cal
This screen displays the null calibration value. The null calibration procedure eliminates any
zero errors inherent in the 670 instrument. Press the [
ENTER
] key to perform the null
calibration. The front panel will flash the message “
CALIBRATING
” while the instrument
performs the calibration procedure. Press either of the arrow keys to change to another screen
and avoid the calibration procedure.
The pressure transducer does not have to be connected to the 670 instrument for this procedure.
Full Scale
FS:
9.99998 Volts
Press ENTER to cal
This screen displays the current full scale voltage value. This procedure eliminates any gain
errors in the 670 instrument by calibrating the output span to an internal standard. To perform
the full scale calibration, press the [
ENTER
] key. The front panel will flash the message
“
CALIBRATING
” during the full scale calibration procedure. Press either of the arrow keys to
change to another screen and avoid the calibration procedure.
The pressure transducer does not have to be connected to the 670 instrument to perform this
procedure.
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