Martel Electronics 235 - Manual (Page 21)

When READY is being displayed, the applied pressure is within
tolerance. You should wait until the actual pressure readings stabilize
and then press the ENT key. The calibrator will then store the readings
and step to the next calibration point.
Manual Calibration using
Calibration System
If the instrument being calibrated requires an input that cannot be
generated by the calibrator or if the output of the instrument cannot be
read by the calibrator, then the Calibration Database will indicate that
the instrument has a Manual input or output.
If the output of the instrument cannot be read by the calibrator, the
calibrator will be configured for Manual input. An example would be a
digital recorder with a mV input and a chart display as an output. The
calibrator will set its output to the required value, pause for the
number of seconds specified in the Calibration Database, and then
prompt the user to enter the indicated value in the engineering units
requested.
The display above is shown while the calibrator is setting its output and
waiting for the instrument to stabilize.
The display shown above is the calibrator prompting the user to enter
the value shown on the instrument’s digital indicator.
The three characters following Man_ (GPM, in this example) are the
engineering units expected as configured in the Calibration Database.
Operation
230/235 16
Man_GPM mV
+10.000
Testing Calpt 01
As Found
Man_GPM mV
??????? +10.000
Enter Input Value