Ultrasound Modulator - GE Medical Systems Corometrics 340 Service Manual

Ultrasound Modulator

Revision A
Calibration: Receiver Calibration
1. Connect a 3 Vp-p 2.3 MHz sine wave signal source into J201 pin 1.
Connect J201 pin 8 to ground. Feed a 300 Hz, 1 Vp-p sine wave into
J6 pin 2, and set R146 to its mid-position. Adjust L1 for maximum
output at TP13. L1 should go through a peak and drop off in
amplitude on either side of the peak setting.
2. Remove the 300 Hz source, adjust R146 for minimum output at
TP13. R146 should go through a null setting with the amplitude
rising at either side.
3. Remove the ground on J201 pin 8 and reconnect the 300 Hz signal
source. Change the frequency of the signal source on J201 pin-1 to
1.151 MHz and adjust L2 for maximum output at TP13. L2 should
go through a peak and drop off in amplitude on either side of the
peak setting.
Model 340 Telemetry System
2006920-001
5-11