Measurement Computing PML 1000 Operating Instructions Manual page 11

PML 1000 Operating Instructions
CALIBRATION AND SCALING
Introduction
Your PML 1000 is designed to operate with a wide range of different LVDT types and in most commonly used
measurement modes. Before your LVDT can be used it must first be calibrated to the PML 1000. This is
performed very easily with the FAST CAL facility.
Calibration [CAL]
From the main Configuration menu select the CAL menu. The unit will display L-iP. Set the LVDT to its zero or
null position and press Enter. The unit will now calibrate to the zero input position of the LVDT. While this is in
progress, the unit will display Wait (VAIT). Once the zero (low) position has be calibrated the unit will display H-
IP. Set the LVDT to its maximum displacement position (normally full scale), and press enter. The unit will now
calibrate for this position. Wait will be displayed while this operation is in progress. At the end of the calibration
process the unit will return to the main menu and display CAL.
NOTE: For best results power the system for 30 minutes before calibrating.
Scaling (SCLE)
The PML 1000 is now calibrated to your LVDT. The default scaling is set to 100.0 units. To allow the unit to
display the correct displacement for your LVDT the low and high display values need to be defined. To set the
display scaling use the scaling menu, SCLE, and set the low display LDSP to the minimum displacement
calibration point value, (usually zero), and set the high display value to correspond to the maximum
displacement calibration point value, (usually full scale). Having defined the display scaling the PML 1000 will
now display displacement in the correct units of measurement and will be calibrated to the attached LVDT. In
some cases, it may be necessary to adjust the number of decimal places to give the best resolution. The
decimal point position may be changed from the display menu.
Low (Zero) Display Value [LdSP]
This is the 0% or minimum displacement display value, which corresponds to the Low calibration point (L-iP).
This value is entered directly but may be changed to any value within the display range of the PML 1000. The
default value is set to 0.0.
High Display Value [HdSP]
This is the 100% or maximum (span) displacement display value, which corresponds to the HiGH calibration
point (H-iP). This value is entered directly but may be changed to any value within the display range of the PML
1000. The default 100.0.
[CAL]
Main menu Calibration option. Press Enter to select.
[L¬P]
Unit is now waiting for the LVDT to be set to its zero (null) position. When ready press the Enter key to continue.
[VAit]
The Indicator will now measure the output from the LVDT. The indicator is now waiting for the LVDT to be set to
its full-scale position. When ready press the Enter key to continue.
[H¬P]
Unit will now measure the output from your LVDT and will determine the appropriate Gain.
[CAL]
Calibration is finished and has been completed successfully with no errors detected by the PML 1000. The PML
1000 returns to the menu.
APP-01025, Rev A
PML 1000 Operating Instructions www.meas-spec.com 1109
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