| Item |
Name |
Function |
| 1 |
Polarity switch |
Used to reverse the polarity of the output
power to the EUT (line and neutral are
swapped). EUT should comply with the required
leakage current limits in Normal and Reverse
polarity. |
| 2 |
Neutral switch |
Used to disconnect the Neutral of the incoming
power (before the polarity switch). Leakage
currents are generally higher with the Neutral
open; many standards and requirements specify
that the Leakage measurement be made with
the Neutral open as a single-fault condition
(higher leakage limits apply). In normal
conditions this switch is left in the Neutral
Connected position. |
| 3 |
Earth-Chassis switch |
In the Open position, used to disconnect the
incoming ground from the output ground in
order to make leakage current measurements.
In the Closed position, the incoming ground and
the output ground are connected together. |
| 4 |
Measurement point switch |
Used to select where the leakage measurement
is being made. In the Chassis position, the
leakage measurement is made from the output
ground to the incoming ground. In the Floating
position, the leakage measurement is made
from where the floating measurement point is
connected by the operator (to the EUT), to the
incoming ground. |
| 5 |
Leakage measurement
connection point |
Your external calibrated meter is connected to
terminals 5 and 6 . Set the meter to read
"millivolts AC" The displayed reading will be 1
millivolt for each milliamp of leakage current. |
| 6 |
Input Ground (circuit common) |
Used as the common point for leakage
measurements.
To measure the resistance from any point to
the incoming (building) ground, turn switch 3 to
"Open", and connect a resistance meter to this
jack, and the other end of the resistance meter
to the point to be measured. |
| 7 |
Output Ground |
To measure the resistance from the ground
wire of the EUT to any other point, turn switch
3 to "Open", and connect a resistance meter to
this jack, and the other end of the resistance
meter to the point to be measured. |
| 8 |
Floating measurement point |
Used to measure the leakage from any point on
the EUT when switch 4 is in the "Floating"
position. This is typically used to measure
leakage from ungrounded parts or patient-
contact parts. |