7-28 170 Series Monitor Revision C
2000947-004
Serviceable Assemblies: Tocotransducer Calibration
Large-Button Tocotransducer
The Corometrics Large-Button Tocotransducer must be calibrated using the
following procedure for use with the 170 Series Monitor.
Equipment Required
Digital voltmeter: DM501 or equivalent with x1 probe or leads
Common Mode Rejection (CMR) Test Jack (Refer to Figure 7-7 and Table
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.
Procedure
During this procedure, refer to Figure 7-9 for the location of potentiometers in the
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.
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