72 Keysight 34921A-34925A User’s Guide
Overvoltage Protection
This module also features high voltage detection (< 100 V) and current limiting
circuitry to protect the FET relays. This circuitry senses current flows from input
overvoltages. These overvoltages may come from either the MUX input or from
the Analog Buses. In addition, each channel is also protected from input
overvoltages with a resistor.
When overvoltage is detected, all relays (Analog Bus and FET) are opened. While
in the overvoltage state, any attempts to close any Analog Bus or FET switch,
results in an error status response from the module.
Once in the overvoltage state, you must restore normal module operation with
one of these actions:
– using the SYSTem:CPON <slot> command. This affects only the module
specified.
– using the *RST command. This command resets the mainframe and all
installed modules to the Factory configuration. This affects all installed
modules.
– cycling system power. This affects all installed modules.
If the overvoltage situation is not resolved, clearing the overvoltage will result in a
new overvoltage event occurring immediately.
Further FET protection is assured only as one channel in each bank is closed at
any time. Thus this module will operate as only a 1:N MUX module. For more
information about FET channel closures, refer to page 21.
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