User`s guide

5 Operation and Connections Tutorial
98 Model N6705A User’s Guide
Operating Modes
The DC Power Analyzer can operate in either constant voltage (CV)
or constant current (CC) over the rated output voltage and current.
Constant voltage mode is defined as an operating mode in which the
dc source maintains its output voltage at the programmed voltage
setting in spite of changes in load, line, or temperature. Thus, when
the load resistance changes, the output voltage remains constant
while the output current changes to accommodate the change in load.
Constant current mode is defined as an operating mode in which the
dc source maintains its output current at the programmed current
limit in spite of changes in load, line, or temperature. Thus, when the
load resistance changes, the output current remains constant while
the output voltage changes to accommodate the change in load.
Although the DC Power Analyzer can operate in either mode, it is
designed as a constant voltage source. This means that the
specifications and operating characteristics are optimized for
constant voltage mode operation. Note that the unit cannot be
programmed to operate in a specific mode. At turn-on, the operating
mode of the unit will be determined by the voltage setting, current
setting, and the load resistance. In the following figure, operating
point 1 is defined by a fixed load line traversing the positive
operating quadrant in the constant voltage region. Operating point 2
is defined by a fixed load line traversing the positive operating
quadrant in the constant current region.
CC Mode Delay
The power supply may momentarily cross into CC mode when it is
first turned on, when a new output value is programmed, or if a load
is connected. In most cases this temporary condition would not be
considered an over-current protection fault, and having an OCP
condition disable the output would be a nuisance. Delay prevents a
CC condition from being detected for a specific time period.
To program a delay, press the Settings key to access the Source
Settings. Navigate to and select Protection. Then press Enter.
Voltage
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Less load resistance
More load
resistance
Downprogrammer
characteristic