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5
Using Load Cards and Loads
Selecting and Loading Flyback Protection
C A U T I O N
5-14
Coils used as loads may have large flyback voltages which have
the potential to damage other electronic components. Generally,
the UUTs are equipped with flyback protection, so flyback
protection on the load cards is redundant but provides
additional back-up protection in case a defective UUT is tested.
The system integrator is responsible for ensuring flyback
protection devices are installed on the load cards.
The load cards are designed to handle a maximum of 500
V
flyback voltage. Operating the load cards without
peak
flyback protection installed on the appropriate channels, or
with flyback voltages in excess of 500 V
damage to the load card or SLU.
The Agilent E6175A 8-Channel Load Card comes with
provisions for user-installed flyback voltage protection.
Figure 5-9
is a detail of the first channel pair, channels 1 and 2,
on the component locator diagram of the 8-Channel Load Card.
It shows the location and polarity orientation for channel 1's
(RT1 and RT2) and channel 2's (RT3 and RT4) flyback
protection devices. This pattern is repeated for the other three
channel pairs.
As an example, in
Figure 5-8
lines connected to the input Form C switch K11. RT1 connects
input line J4 and RT2 connects alternate input line J3, to the
output of Load1. When a voltage spike occurs on the UUT that
exceeds the rating on the flyback device, the device clamps the
surge voltage to the device's predetermined value.
, may results in
peak
Chan1 has two potential input
E6198B Switch/Load Unit User Manual
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