Safety Interlock The Analog Buses o

Safety Interlock The Analog Buses of the 34980A are capable of
carrying 300V signals. The MUX and matrix modules have a
hardware Safety Interlock feature that automatically opens the
Analog Bus relays when the associated interlock pins on the D-sub
connectors (faceplate) lose continuity. This prevents signals on the
Analog Buses from being present on the D-sub connector pins.
Optional terminal blocks available from Agilent automatically
provide continuity for these interlock pins. If cables are used,
you must provide continuity for the interlock pins in your DUT
assembly. See the pinout information later in this chapter for the
location of interlock pins on each module.
The MUX modules have Analog Bus relays on each of their two
banks. Therefore, the interlock pins are present on both the Bank 1
and Bank 2 D-sub connectors on the MUX modules.
Normally, if you attempt to connect to the Analog Buses without
a terminal block or cable connected, an error is generated.
The SYSTem:ABUS:INTerlock:SIMulate command
allows you to temporarily disable errors generated by the Safety
Interlock feature and enables the simulation mode. Although Safety
Interlock errors are suppressed in this mode, the actual Analog Bus
relays affected by the Safety Interlock are disabled as long as no
terminal block or cable is connected to the module.