High-End Pressure Controller
CPC8000
76
Operating Instructions - CPC8000
sponding point in the “Reference” or “Actual” columns and a data entry keypad will appear on the side
bar. Enter and accept the point using the key pad and check [
]. Pressing the [Save] button linearizes
the internal sensor based on the “As Found” data entered.
Linearization can also be accomplished for each transducer in a “live Calibration” by pressing the
[Linearize] / [Live Cal] button. The Live Cal allows the calibration technician to perform the calibration and
linearization for each sensor in a more direct way. In the Live Cal, the reference standard is connected
to the Measure/Control port and the CPC8000 is placed in Measure mode. Choose the transducer
to be tested by pressing the [Primary], [Secondary], [Tertiary], or [Barometer] button. The reference
pressure generated by the standard is recorded in the “Reference” column for each point. The reading
of the internal transducer for each pressure point can be seen directly in the “Reading” window. Pressing
the corresponding point under the “Actual” column will accept that reading into that point. Subsequent
pressure points generated by the pressure standard are accepted and recorded in the same way. After all
points are entered, press the [Save] button to linearize the internal sensor based on the “Live Cal” data.
Figure 7.5.2.5.3b - Live Cal
At any time the [Factory Cal] button can be pressed to revert back to the factory calibration.
The Reference points and Actual points can also be sent over the remote bus for automated sensor
linearizations. First ensure the instrument is not in Autorange by sending “Sensor <n>” where <n> is the
sensor you wish to linearize, or by bringing up the Linearization screen from the Applications menu (this
automatically takes the CPC8000 out of autorange). Set each reference pressure with the command
“Desiredpress <n>,<pressure>” where <n> is the 0th based index. “Desiredpress 0,0” will set the 1st
Reference point’s value to 0. “Desiredpress 1,1.5” will set the 2nd reference point to 1.5, etc. Each subse-
quent reference point must be greater in value than the previous point. It is advised to send all of your
Reference points frst before proceeding. Use your reference (e.g. CPB6000) to control the pressure on
the measure port to the Reference/desired pressure. Then send the pressure reading over the bus with
the command “Actualpress <n>,<reading>” where <n> is the 0th based index. This reading should be
/- 1%FS of the Reference point. Using Figure 7.5.2.5.3a for example, if you have sent “Desired-
press 3,1209.0”, you would send “Actualpress 3,<reading>” where <reading> must be between 1168.70
and 1249.30. Send each of the 11 readings with the “Actualpress” command and then send “Calculate_
as_found_linearity” and then “Save_linearity”. Your active sensor linearization is now complete.
Summary of Contents for CPC8000
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