Two-Mainframe System - Keithley 7021 Instruction Manual

Card Connections and Installation
Figure 4-14 shows how external connections can be made for
the multi-pin connector cards. In this example, a single Mod-
el 7011-MTC-2 round cable assembly is cut in half to pro-
vide two cables, each of which is unterminated at one end.
The unterminated ends of the two cables are hard-wired to
instrumentation and DUT as shown in the drawing. The other
ends of these cables mate directly to the Model 7021 cards.

Two-mainframe system

Figure 4-15 shows a system using three multiplexer cards in-
stalled in two Model 7001/7002 mainframes to configure a
single 1 × 90 multiplexer system. Each card is configured as
a single 1 × 30 multiplexer. To accomplish this, bank-to-bank
jumpers of all three cards must be installed to connect banks
A and B together.
By leaving the backplane jumpers of the cards in mainframe
1 installed, the banks of card 1 are connected to the banks of
card 2 through the analog backplane of the Model 7001/7002
mainframe resulting in a 1 × 60 configuration. External bank
connections from the instrument to the card in the second
mainframe connect the banks of all three cards together to
form the 1 × 90 multiplexer system. This system is similar to
the two-card system (see previous paragraph) except that a
third card (installed in a second mainframe) is added.
4-12
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