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SECTION 6 PREVENTIVE MAINTENANCE

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6-4

6.2.3 Patient Interface Cable (PIC) Checkout Procedure

The successful completion of this test will verify function of the BIS VISTA system from

the BISx circuits to the patient connector. Since the conductors used are located both in the

BISx and the PIC, use a swapping technique to isolate the faulty component.

Use a Sensor Simulator or make a Test Sensor for this test. See Section 10.3 “Test Sensor”

for details.

IF ANY FAILURES ARE NOTED, SEE SECTION 7.3, “BIS

VISTA System Messages And Corrective Actions”.

1. Using a known good BIS VISTA monitor (see section 6.2.1 “Monitor Checkout

Procedure) and a known good BISx (see section 6.2.2 “BISx Checkout Procedure)

connect the PIC that you are testing to the BISx, and connect the BISx to the BIS

VISTA monitor.

2. Press the monitor’s ON/Standby button to start up the monitor and BISx. At the

completion of the power up self-test, verify that the screen message “Connect sensor

or cable” displays.

3. Connect a Sensor Simulator (see Section 10.2) or Test Sensor (see Section 10.3) to

the PIC cable.

4. A sensor check is initiated automatically when the sensor and PIC are connected to

the BISx. (It may also be initiated by pressing the [SENSOR CHECK] touch key.)

The message, “Sensor Check in Progress” appears. When the sensor successfully

passes the test, the BIS Trend screen displays.

5. If the Sensor Check is not immediately successful, the Sensor Check Graphic

Screen displays automatically. This screen shows a sensor with each electrode

numbered. Colors indicate the status of each electrode.

• White hollow circle – No status is available (Lead is off).

• Green circle – The electrode impedance is within the acceptable range.

• Red blinking circle – The electrode impedance is not within the acceptable range.

The impedance value for each electrode, in kilo ohms, appears on the screen along

with its status:

• PASS - An electrode passes if the impedance for that electrode is less than 7.5

kilo ohms. The ground electrode (element #2) must be less than 30 kilo ohms to

pass.

• HIGH - An electrode is labeled “HIGH” if its impedance value is above 7.5 kilo

ohms. As long as the combined impedance of electrodes #1 and #3 and the

combined impedance of electrodes #1 and #4 are less than 15 kilo ohms, the

sensor check will be considered successful.

• NOISE - If the signal from the electrode goes beyond the measurable range, the

label “NOISE” displays.

• LEAD OFF - If the impedance check indicates that the electrode is not in

contact with the patient, the label “LEAD OFF” displays.

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