GE H48651KR, Service Manual

Page: 504 / 516

GE V
OLUSON
i / V
OLUSON
e
D
IRECTION
KTI106052, R
EVISION
10 S
ERVICE
M
ANUAL
10-20 Section 10-7 - Electrical Safety Tests
10-7-8
Isolated Patient Lead (Source) Leakage–Lead to Ground
10-7-8-1 Definition
This test measures the current which would flow to ground from any of the isolated ECG leads.
The meter simulates a patient who is connected to the monitoring equipment and is grounded by
touching some other grounded surface.
Measurements should be made under the test conditions specified in:
• Table 10-10 on page 10-13 , or:
• Table 10-11 on page 10-13 , as applicable.
For each combination the operating controls, such as the lead switch, should be operated to find the
worst case condition.
10-7-8-2 Generic Procedure
Measurements should be made under the test conditions specified in:
• Table 10-10 on page 10-13 , or:
• Table 10-11 on page 10-13 , as applicable.
For each combination, the operating controls such as the lead switch should be operated to find the
worst case condition.
CAUTION
Equipment damage possibility. Never switch the Polarity when the unit is powered ON.
Be sure to turn the unit power OFF before switching the polarity using the POLARITY switch.
Otherwise, the unit may be damaged.
Figure 10-6 Test Circuit for Measuring Patient Lead Leakage
POWER
OUTLET
H (Black)
N (White)
G (Green)
Internal
circuitry
Insulating surface
Polarity reversing switch
(use both positions)
Appliance power switch
(use both "off" and "on" positions)
Patient connected leads
The connection is at service entrance
or on the supply side of a separately
derived system
Building
ground
Grounding contact switch (use in both
"open" and "closed" positions)
Current meter
H = Hot
N = Neutral (grounded)
G = Grounding conductor
H
N
G
Patient lead selector switch (if any)
(activated as required)
Appliance
Between each patient
lead and ground