GE MEDICAL SYSTEMS LOGIQ A1 BASIC SERVICE MANUAL
REV 2 5176463-100
20
2-3-4 Probe Leakage Current Test
Description
This test measures the current that would flow to the ground from any of the probes
through a patient who is being scanned when he comes into contact with the ground
surfaces.
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.
Illustration 2-6 SET UP for Probe Leakage Current
Note:
Each probe will have some amount of leakage current, dependant on its design.
Small variations in probe leakage currents are normal from probe to probe. Other
variation will result from differences in line voltage and test lead placement.
Meter Procedure using Probe Adapter and Saline Bath
The dale 600/600E provides a method for testing probes independently from the system.
The meter utilizes a probe adapter to apply common test potential to all connector pins.
The probe’s imaging area is immersed in a saline solution along with a grounding probe
from the meter to complete the current path. Saline solution is a mixture of water and
salt. The salt adds a free ion to the water, making it conductive. Normal saline solution is
0.9% salt or 1/2 gram salt per 1 liter of water. If saline is not available, a mixture of 1
quart water with one or more grams of table sale, mixed thoroughly, will substitute.
CAUTION:
To avoid probe damaged and possible electric shock, do not immerse
probes into any liquid beyond the level indicated in the operator’s manual. Do not touch
To Next Page
Loading...
Need help?
General
