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Autoranging
Downprogramming
CC Mode Delay
Model N6705 User's Guide
Autoranging only applies to Agilent N675xA and N676xA power modules.
NOTE
The following figure illustrates the autoranging output characteristic
of the Agilent N675xA and N676xA power modules. Point 3 shows a
situation in which the voltage and current settings are such that the
operating locus is limited by the maximum output power boundary of
the output. Depending on the power module, this may be greater than
the output power rating of the module. In this situation, the output is
not guaranteed to meet its operating specifications because it is
operating in an area that is outside its specified power rating.
Vmax
Vset
Downprogrammer
characteristic
As shown by the dashed line on the left in the figures, the DC Power
Analyzer is capable of sinking current over the output voltage range
from zero volts to the rated voltage. This negative current sinking
capability provides fast downprogramming of the output. The
negative current is not programmable.
The power supply may momentarily cross into constant-current (CC)
mode when it is turned on, when an output value is programmed, or
when the output load is connected. In most cases these temporary
conditions would not be considered an over-current protection fault,
and having an OCP condition disable the output when the CC status
bit is set would be a nuisance. Specifying an OCP delay will ignore
the CC status bit during the specified delay period. For example, if
the OCP delay is 100 ms, and the output goes into CC mode for 80 ms
and then back to CV mode, the output will not shut down, If the CC
mode persists for more than 100 ms, the output will shut down.
To program a delay time, press the Settings key to access the Source
Settings. Navigate to and select Protection. Then press Enter.
Advanced Source and Measurement Functions 6
Voltage
1
More load
resistance
Less load resistance
0
3
2
Current
Iset
Imax
155
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