Revision C 170 Series Monitor 7-23
2000947-004
Serviceable Assemblies: Tocotransducer Calibration
Calibration for Cat. No. (REF) 2264 GAX/HAX/JAX/KAX/LAX/MAX
Refer to Figure 7-6 during calibration.
1. Set the Gain (R11) and Offset (R6) potentiometers fully clockwise.
2. Connect the positive lead of the digital voltmeter to TP2 on the Main Board;
connect the negative lead to TP9.
3. Turn on the monitor.
4. Plug the CMR Test Jack into the monitor’s
UA connector.
5. Measure the voltage across the test points and record the value.
6. Replace the CMR Test Jack with the transducer to be calibrated.
7. Place the tocotransducer on a flat surface so that the button is face up, then
center the 52.5 gram weight on the pressure sensitive button.
8. Adjust the Offset (R6) potentiometer so that the voltage matches the reading
recorded in step 5 ± 0.04 V. This voltage is referred to as the “weight on”
voltage.
9. Remove the weight and observe the voltage reading; this voltage is referred
to as the “weight off” voltage. A correctly adjusted transducer will show a
voltage change of +0.115 V ± 0.015 V. If the change is less, adjust the Gain
(R11) potentiometer counterclockwise to increase the gain. If the change is
more, adjust the Gain (R11) potentiometer clockwise to decrease the gain.
10. Repeat step 7 through step 9 until the change in voltage between the “weight
on” and “weight off” conditions falls into specification.
11. Torque seal all potentiometers.
12. Follow the instructions for “Nautilus Transducer Reassembly” on page 7-32.
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