Operating the Power System 4
Keysight N6700 User’s Guide 89
Factors that influence how long the settings change or output load
change may last include: difference between old output value and new
output value, the current limit setting, and the load capacitance in CV
mode or load inductance in CC mode. The delay required must be
determined empirically; the power module programming-response time
characteristics may be used as guidelines.
Note that the time it takes the output to go into CC mode varies -
depending on the magnitude of the over-current condition compared to
the current limit setting. For example, if the over-current is only slightly
greater than the current limit setting, it may take several tens of
milliseconds, depending on the power module type, for the output to set
the CC status bit. If the over-current is significantly greater than the
current limit setting, it may only take a few milliseconds or less,
depending on power module type, for the output to set the CC status bit.
To determine when the output will shut down, you must add the time it
takes for the CC status bit to the over-current protection delay time. If
the over-current persists beyond the sum of these two time intervals, the
output will shut down.
Protection coupling lets you disable all output channels when a
protection condition occurs on a single output channel. To couple output
protection:
Select
.
Check the Enable Coupling box
and press Select.
To enable output protection
coupling:
The output watchdog timer causes all outputs to go into protection
mode if there is no SCPI I/O activity on the remote interfaces (USB, LAN,
GPIB) within the user-specified time period. Note that the watchdog
timer function is NOT reset by activity on the front panel or when using
the Web server – the outputs will still shut down after the time period
has elapsed..
After the time period has expired, the outputs will be disabled, but the
programmed output state is not changed. The PROT bit in the status
questionable register as well as the PROT indicator on the front panel
will be set.
The watchdog delay can be programmed from 1 to 3600 seconds in 1
second increments. As shipped from the factory, the watchdog timer is
set to disable the outputs 60 seconds after all IO activity has ceased.
The watchdog state and delay settings are volatile, but can be saved and
recalled as part of the instrument state. A watchdog protect can be
cleared as described under “Clear Output Protection Functions”.
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