GE LOGIQ P9, Руководство по обслуживанию

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GE DRAFT LOGIQ P9/P7
D
IRECTION
5604324 , R
EVISION
11 DRAFT (J
ANUARY
24, 2019) S
ERVICE
M
ANUAL
Chapter 10 - Care & Maintenance 10-29
10-8-7 Type BF Patient Leakage Current Test - Probe
10-8-7-1 Definition
This test measures the current that would flow to ground from any of the probes through a patient who
is being scanned and becomes grounded by touching some other grounded surface.
NOTE: Some leakage current is expected on each probe, depending on its design. Small variations in probe
leakage currents are normal from probe to probe. Other variations will result from differences in line
voltage and test lead placement. It is abnormal if no leakage current is measured. If no leakage current
is detected, check the configuration of the test equipment.
10-8-7-2 Generic Procedure on Leakage Current
Measurements should be made with the ground open and closed, with power line polarity normal and
reversed, and with neutral open and closed. For each combination, the probe must be active to find the
worst case condition.
Figure 10-20 Set Up for Probe Leakage Current
NOTE: Saline water pod should be insulated from floor and earth ground
CAUTION
!! CAUTION:
Equipment damage possibility. Never switch the Polarity and the status of Neutral when the unit
is powered ON. Be sure to turn the unit power OFF before switching them using the POLARITY
switch and/or the NEUTRAL switch. Otherwise, the unit may be damaged.
Table 10-18 Typical Data Sheet for Type BF Patient Leakage Current Test
Tester Neutral Tester Polarity Switch Ground Switch Measured leakage current
Closed Normal Closed
Closed Normal Open
Closed Reversed Closed
Closed Reversed Open