Keysight 34934A - Operating and Environmental Considerations

Overview of the 34934A 1
Keysight 34934A User’s Guide 13
Operating Considerations
Connection to Voltage Sources
Although flexible, it is possible to connect more than one source at the same time
with the 34934A. Make sure that dangerous or unwanted conditions are not
created by these connections.
Safety Interlock
The 34934A module has a hardware Safety Interlock feature that automatically
opens all 512 of the module’s relays when the associated interlock pins on the
high-density D-Sub connectors (faceplate) or extension headers (terminal block
or configuration block) lose continuity. This prevents signals from your field wiring
from being present on exposed pins on the opposite D-sub connector or extension
header.
If you connect to the D-Subs with custom cabling, you must provide continuity for
the interlock pins as part of your field wiring / DUT assembly. Specific instructions
for providing safety interlock continuity at the D-Sub connectors are provided for
each configuration.
If you connect your field wiring using the optional terminal blocks or configuration
blocks (available from Keysight) you must also provide continuity for the interlock
pins. This can be accomplished by installing the supplied terminators in the
extension headers. Specific instructions for providing safety interlock continuity at
the extension headers are provided for each configuration.
Electrical Considerations
See the Introduction to the Plug In Modules chapter of the 34980A Mainframe
User’s Guide for detailed environmental operating conditions for the 34980A
mainframe and its installed modules. That guidance sets maximum per channel
current and power ratings at rated voltage for pollution degree 2 (possible
condensation) condition, for the 34934A matrix module.
Thermal Considerations
Because of mainframe thermal and power-supply restrictions, you can close no
more than 64 channels (crosspoint relays) on the 34934A at one time. If you try to
close a 65th channel, an error will be generated from the 34980A, and the
channel will remain open.