User manual

Using Load Cards and Loads 5
E6198B Switch/Load Unit User Manual 5-35
External Load Mounting Options
Loads typically consist of “real” devices (injectors, actuators,
etc.) that cannot be mounted on the load card. If cable
resistance is a significant factor (such as for low form-factor or
low-value resistive loads), one solution is to mount the loads on
a metal plate that fits into the SLU slots adjacent to the load
card (Figure 5-25). Follow these guidelines if you choose to
mount the loads externally:
• Mount the loads as close to the load card as possible.
• The dimensions of the load plate for the 16-channel card are:
Height- 23.32 cm (9.18 in.)
Length (Max)- 34.00 cm (13.386 in.)
Thickness- 1.59 mm (1/16 in.).
• Arrange the loads so that the lowest impedances have the
shortest cable runs.
• Route cable runs to the externally mounted loads so that you
can remove other cards without having to disconnect any
wiring.
• Clearly identify all cables to externally mounted loads,
including those on a load plate. Use labels, numbers, color
coding, or some combination of these methods. Cabling to
polarity sensitive devices should be labeled appropriately.