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Selecting a Current-Sense Resistor Value
C A U T I O N
Using the Power Switches as General Purpose Relays
E6198B Switch/Load Unit User Manual
and the NC pins are jumpered to power bus 1. The jumper
combs for J3-J8 and J10-Jl5 can be easily cut to provide bus or
pin isolation between the various input/power bus connections.
The card comes with a factory loaded with a three watt, 0.05 ,
0.1% sense resistor already installed. If lower value currents are
being measured, requiring a larger resistance value to make the
sense voltage readable, then replace the sense resistor with a
four-wire resistor of higher value.
Be sure to size the power dissipation of the sense resistor large
enough to handle the expected current of the load.
The U7177A has a special feature that is similar to E6177A load
card. It has both the high and low side of the load brought out to
the front panel. This allows the load switching relay to be
alternatively used as a general-purpose switching relay. For
instance, to use channel 1 of the load card as a general-purpose
switching relay, jumper across the LOAD 1 pins on the load
card. See
Figure
5-35.
Using Load Cards and Loads
5
5-49
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