MKS 651C - How to Calibrate Full Scale Span for the Analog Set Point

Chapter Five: Local Operation How To Set Lead and Gain Parameters
57
How To Calibrate Full Scale Span for the Analog Set Point
The 651 units are calibrated at the factory for 10 Volt full scale input; if the actual input applied
is 10 Volts, the analog set point display shows a value of 100%. To recalibrate the 651 unit to
operate at a full scale input on your system, for example, 9.5 Volts, apply 9.5 Volts to the I/O
connector on the rear panel and follow the steps below.
1. From the default display,
pressure
and
position
, press [
] and the [S
TOP
] key
simultaneously for about three seconds until the following display appears.
CAUTION
CALIBRATION MODE
2. Press the [Setpoint D] key. The following display appears.
ANLG SP: 99.90%
FULL SPAN: 20015
3. Use the Adjust knob to change the value of the analog set point to 100%. The 9.5 Volt
input to the I/O connector on the rear panel is now the full scale value.
Note
To ensure that the analog set point is adjusted correctly, turn the Adjust
knob until the reading flickers between 99.99% and 100.00%. The
display reads 100.00% for an overrange reading as well as a true 100%
reading.
4. Press any key to return to the default display,
pressure
and
position
.
Note
The maximum adjustment for full scale span is 15% of full scale.