SHIMPO 921A - Manual (Page 23)

TRICOR Systems Inc.
4.2
If the configuration uses resistance, then the Generic Nest Assembly (or
equivalent) must be connected to the DF for calibration. If the four-clip
version, PN 921-140-102 is used, the Red clips (I+ and S+) must be
connected together and the black clips (I - and S -) must be connected
together for the purpose of calibration. The red and black clips cannot be
shorting together or to a metal surface. Failure to properly setup the Generic
Nest (or equivalent) will result in a calibration failure message when
calibration is attempted. The calibration process corrects out all system
offsets and hardware deviations so that the device to be tested is the only
unknown.
Install the block or tighten the vice clamp together. Position the sensor
approximately 1/2-inch above the block or vice clamp and press READY.
The message CALIBRATION IN PROCESS will be displayed.
The sensor will move in to the block or vice clamp and back out twice. This
process provides the exact positioning, force, and resistance data required to
accurately test a device.
When the calibration cycle is complete, the READY indicator will illuminate,
the CAL indicator will extinguish, and the message INSTALL DEVICE, THEN
PRESS READY will be displayed. This message indicates that the
calibration cycle is complete. All references have been obtained, and the
921A is ready to test the selected device.
The calibration cycle can be run whenever desired by pressing the MODE
switch. This is useful if the operator suspects the original calibration has
changed. For example, if the sensor has been moved by more than 1 inch,
the original calibration will be invalid and a new calibration cycle will be
necessary to reestablish calibration.
After the MODE switch has been pressed, the message INSTALL
DISTANCE REFERENCE GAUGE (or ENSURE PEDESTAL SETUP for
CAL), PRESS READY WHEN INSTALLED. PRESS CAL TO ABORT will be
displayed.