Service manual

Service Manual Calibration 41
11. Connect the oscilloscope reference lead to TP43 or TP1 on the Analog board.
12. Check for  15mV peak-to-peak noise.
13. Disconnect all patient inputs to the Encore’s left side panel.
EMI Null Adjustment
1. Touch the oscilloscope probe to TP45 on the Analog board (square metal pad).
2. Disconnect the oscilloscope reference lead.
3. Set the oscilloscope vertical sensitivity and horizontal timing to observe the ac mains
noise component.
4. Adjust RP4 to null the higher frequency (100kHz) noise over-riding the ac mains
component.
5. Move the oscilloscope probe to TP19 (upside down “L” shaped pad above J4). See
the figure on page 38.
6. Adjust RP1 on the Digital board (accessed through slot in Analog board) to null higher
frequency (100kHz) noise, over-riding the ac mains component.
7. Disconnect the scope probe.
Invasive Blood Pressure
Skip this part of the calibration procedure if your Encore does not support IBP
measurements.
1. Connect the IBP simulator to P1 on the Encore left side panel.
2. Set the patient simulator to 0mmHg.
3. Press ZERO P1 to zero the channel.
4. Set the patient simulator to 200mmHg.
5. Adjust RP5 for a numeric reading of 200mmHg on the Encore monitor screen.
6. Move the IBP cable to the P2 connector.
7. Set the simulator to 0mmHg.
8. Press ZERO P2 to zero the channel.
Note
Measure the low frequency noise (bounce) only. Make the peak-to-peak
measurement from the center-to-center of the trace to disregard the “fuzzy” high
frequency noise.
Caution Many blood pressure simulators are not intended for use as calibration
standards. Use only recommended simulators for calibrating the Encore.
Note
If your Propaq Encore does not include a second pressure channel, skip
Steps 6 - 10.