Overcurrent Conditions With External Supplies; Command Execution Times - Agilent Technologies 34945A User Manual

5
Additional Operating Information
Overcurrent conditions can often be avoided with an activation pulse duty
cycle of 25%. This allows the power supply to recover before the next actuation
pulse is sent. An example of pulse width and recovery time values that achieve
a 25% duty cycle is:
ROUT:CHANnel:DRIVe:PULSe:Width 0.015, (@1101)
ROUTE:CHANnel:DRIVe:TIME:RECovery 0.045, (@1101)
Because switching speeds vary between switches, it may be necessary to vary
the pulse width and recovery time settings to achieve values that prevent
overcurrent conditions, yet still achieve the desired system performance.
Using switches with current interrupt options can also increase performance
as less power is consumed by the switch.

Overcurrent Conditions with External Supplies

Overcurrent conditions can occur using an external supply if the supported 2A
limit of the 34945EXT is momentarily exceeded. The duty cycle of the
externally supplied actuation pulse is regulated using the same commands as
used with the internal supply.

Command Execution Times

Setting pulse widths and/or power supply recovery times at, or close to their
maximum values results in longer command (open/close) execution times. For
example, setting a channel pulse width of 255 ms and a recovery time of
255 ms requires 510 ms for the command to complete. Setting these values for
all channels on the 34945EXT could result in an execution time of over 30
seconds.
108
Figure 5-7. Actuation Pulse Duty Cycle: Pulse Width + Recovery Time.
Agilent 34945A Microwave Switch/Attenuator Driver Module User's Guide