GE H
EALTHCARE
DRAFT
V
OLUSON
E8 / V
OLUSON
E6
D
IRECTION
KTD102576, R
EVISION
7
DRAFT (A
UGUST
23, 2012)
S
ERVICE
M
ANUAL
Chapter 10 - Care & Maintenance
10-19
10-7-6
Isolated Patient Lead (Source) Leakage–Lead to Ground
10-7-6-1
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:
•
•
, as applicable.
For each combination the operating controls, such as the lead switch, should be operated to find the
worst case condition.
10-7-6-2
Generic Procedure
Measurements should be made under the test conditions specified in:
•
•
, as applicable.
For each combination, the operating controls such as the lead switch should be operated to find the
worst case condition.
CAUTION
!! CAUTION:
Equipment damage possibility. Never switch the Polarity when the system is powered ON.
Be sure to turn the system power OFF before switching the polarity using the POLARITY switch.
Otherwise, the system may be damaged.
Figure 10-3 Test Circuit for Measuring Patient Lead Leakage
Table 10-16 Testing Power Conditions
ECG Power
Meter’s Polarity Switch
Meter’s Neutral Switch
ON
NORM
CLOSED
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
