Probe Leakage Current Test; Definition; Generic Procedure; General Procedure - GE LOGIQ 180 Basic Service Manual

GE M S
EDICAL YSTEMS
D 2317229, R
IRECTION EVISION
10-7-6

Probe Leakage Current Test

10-7-6-1

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.
10-7-6-2

Generic Procedure

Measurements should be made with the ground open and closed, with power line polarity normal and
reversed, and with the unit Off and On. For each combination, the probe must be active to find the worst
case condition.
H (BLACK)
N (WHITE)
POWER
OUTLET
G (GREEN)
NOTE:
Each probe will have some amount of leakage current, dependent 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.
10-7-6-3

General procedure

Follow these steps to test each transducer for leakage current.
1.) Turn the LOGIQ™ 180 unit OFF.
2.) Plug the unit into the test meter, and the meter into the tested AC wall outlet.
3.) Plug the external probe into the meter's "EXTERNAL" connector.
4.) Set the meter's "FUNCTION" switch to EXTERNAL position.
5.) Connect the probe for test with the connector of the console.
6.) Add the saline probe and the imaging area of the probe into the saline bath.
7.) Have unit power ON for the first part; turn it OFF for the second half.
8.) Depress the ISO TEST rocker switch and record the highest current reading.
9.) Follow the test conditions described in
10.)Keep a record of the results with other hand copies of PM data.
3
POLARITY REVERSING SWITCH
MOMENTARY
SWITCH
Figure 10-68 Set Up for Probe Leakage Current
Chapter 10 Quality Assurance
LOGIQ™ 180 B
CONSOLE
LEAKAGE TEST
METER
Table 10-49 for every transducer.
S M
ASIC ERVICE ANUAL
PROBE
10 - 17