Isolated Patient Lead (Source) Leakage - Lead-To-Ground - GE Vivid 3N Pro Series Service Manual

Table of Contents

Isolated Patient Lead (Source) Leakage – Lead-to-Ground

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.

CAUTION: To avoid damaging the unit, never switch the polarity and the neutral status 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.

Generic Procedure

Measurements should be made with the Ground Open and Closed, with the Vivid 3N unit ON and OFF,

and with the power line polarity Normal and Reversed. Record the highest reading. For each

combination, the operating controls (such as, the lead switch) should be operated to find the worst case

The connection is at service entrance

or on the supply side of a separately

derived system

Grounding contact switch (use in both

"open" and "closed" positions)

Polarity reversing switch

(use both positions)

Figure 10-4 Test Circuit for Measuring Non-Isolated Patient Leads

Section 10-7 - Electrical Safety Tests

Appliance power switch

(use both "OFF" and "ON" positions)

Insulating surface

Current meter

Patient lead selector switch (if any)

(activated as required)

Patient connected leads

Between each patient

lead and Ground

N = Neutral (grounded)

G = Grounding conductor