Using Load Cards and Loads 5
E6198B Switch/Load Unit User Manual 5-29
The Agilent E6176A Load Card comes with provisions for
user-installed flyback voltage protection. Figure 5-40 is a detail
of the first two channels on the component locator diagram of
the 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 when they are installed. This pattern
is repeated for the other fourteen channels.
The flyback protection devices function exactly the same as for
the 8-Channel Load Card; one flyback protection from the
output to the normally open side of the power switch, and one
flyback protection from the output to the normally closed side
of the power switch.
In Figure 5-41, Channel 1 has two input lines connected to the
input Form C switch. RT1 connects input line J4-J7, and RT2
connects alternate input line J8-J11, 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
devices predetermined value. The flyback protection is installed
similarly on each input line.
The load cards are designed for a maximum of 500 V
peak
flyback voltage. Operating the load cards without flyback
protection installed on the appropriate channels, or with
flyback voltages in excess of 500 V
peak
, may results in
damage to the load card or SLU.
Figure 5-19 16-Channel Load Card - Flyback Device Polarity Orientation
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