Trio™ Service Manual
0070-10-0591-01
2 - 11
Calibration/Maintenance
Calibration and System Checks
2.4.3
Safety Tests
Equipment: Safety Analyzer (Dempsey Model 431 or equivalent).
2.4.3.1
Leakage Current Tests
Case Leakage
1.
Plug the line cord of the unit into the safety analyzer.
2.
Connect the case ground lead of the analyzer to the equipotential lug of the monitor (at
rear of monitor).
3.
Perform the tests under the following conditions:
a.
Case Grounded:
Normal polarity
Polarity with open neutral
b.
Case Ungrounded
Normal polarity
Polarity with open neutral
Reverse polarity
4.
Verify the current reading of the test is <100µA under normal operating conditions;
<300µA under a single fault condition for 120 VAC and <500µA under a single fault
condition for 230 VAC.
Patient Leakage
1.
Perform the test under the following conditions:
a.
Lead to ground: Sink current patient circuit (Test V Model 431 Dempsey)
b.
Patient leakage with line voltage on leads
2.
Connect the ground wire from the safety analyzer to the equipotential lug of the monitor.
3.
Connect the ECG cable from the analyzer to the monitor.
4.
On the safety analyzer, depress the
APPLY 115 VAC
button and note the reading.
5.
Repeat the test for normal and open ground polarity combinations.
6.
Verify the current readings of the test are <50µA under a single fault condition.
