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5
Using Load Cards and Loads
Figure 5-20 16-Channel Load Card - Flyback Circuit Detail
l
Protection Devices
* The card was tested using a General Electric GE MOV II, MA series MOV
5-30
The flyback protection devices should be installed with the
positive side towards the UUT. On each of the 16 channels the
high (+) side should be located as shown in the component
locator diagram,
Figure
back-to-back zener diodes are recommended for flyback voltage
*
protection.
Zener Diodes, MOVs (Metal-Oxide Varistor) or Transzorbs
devices mounted at RTx or RTy (2 required per load - 1 at NC
and 1 at NO) provide current path for the inductive load
flyback. Select the protection device so that it conducts at a
voltage higher than the UUT's internal protection. If the device's
internal protection fails, then the added external protection
conducts to protect the UUT and the load card.
5-41. MOV (Metal Oxide Varistor), or
E6198B Switch/Load Unit User Manual
®
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