5-62 E6198B Switch/Load Unit User Manual
5 Using Load Cards and Loads
Using the Agilent N9377A 16-Channel Dual-Load Load Card
The Agilent N9377A 16-channel dual-load load card with
current sensing is intended to be used with high power loads
mounted outside the Switch/Load Unit. The dual-load feature
permits testing for some common test scenarios:
• An engine control unit smart driver may need to check for
shorts to ground and Vbatt.
• Some tests require one load (such as a pure resistance) for
part of the test and a second load (such as a real inductive
load) for another part of the same test.
Figure 5-43 shows a block diagram of the N9377A. Figure 5-44
shows the load card layout. Other features include:
• The card is one slot wide. “Card Location Recommendations"
• The card type is 07
h
. “Load Card Type and Configuration ID"
• Each channel is capable of up to 7.5 amp continuous carry
into a resistive load, 15 amp peak. The factory default
configuration is explained in “Selecting a Power Supply
Configuration".
• The factory default is to load a 0.05Ω, 0.1% Isense resistor in
each channel. “Selecting a Current-Sense Resistor Value"
• The flyback protection is connected from both the normally
open (NO) and normally closed (NC) power switch
connections. “Selecting and Loading Flyback Protection"
• Loads are mounted externally and interface to the card using
two load connectors, J1 and J2. “Connecting Loads"
It is possible to close more than one channel at a time. The power
supply connections to the load card and individual channels are
rated for 7.5 amps maximum continuous. Do not exceed these
specifications.
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