GE Corometrics 170 Series Service Manual page 160

Large-Button Tocotransducer
Equipment Required
Procedure
7-28
Serviceable Assemblies: Tocotransducer Calibration
The Corometrics Large-Button Tocotransducer must be calibrated using the
following procedure for use with the 170 Series Monitor.
Digital voltmeter: DM501 or equivalent with x1 probe or leads
Common Mode Rejection (CMR) Test Jack (Refer to
7-8.)
Calibrated 170 Series Monitor
Screwdriver or potentiometer adjustment tool
52.5 gram weight (cat. no. 7825AA)
Sealing tape (cat. no. 7730AA)
Torque seal
IMPORTANT
WEIGHT TYPE—The weight (cat. no. 7825AA) is designed
specifically for testing large-button tocotransducers.
During this procedure, refer to
Trimline tocotransducer.
Figure 7-9. Large-Button Tocotransducer Potentiometer Locations
1. Remove the nameplate and sealing tape from the top cover of the
tocotransducer.
2. Set the ZERO TRIM and GAIN potentiometers in the tocotransducer fully
counterclockwise.
3. Locate TP2 and TP9 (ground) on the Main Board in the 170 Series Monitor.
170 Series Monitor
2000947-004
Figure 7-9 for the location of potentiometers in the
Figure 7-7 and Table
Revision C