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4 Using the Regenerative Power System
When the unit is in current priority mode, you can specify a positive or negative output current level,
which will be maintained as long as the output voltage remains within its programmed limit.
Front Panel Menu Reference
Press the Current key.
Enter a positive or negative value.
Then press Select.
Set the Slew Rate
The voltage slew rate determines the rate at which the voltage changes to a new setting. This only
applies to voltage settings while operating in voltage priority mode. When set to MAXimum, INFinity,
or to a very large value, the slew rate will be limited by the unit's listed programming speed and
bandwidth. This setting can be used to prevent crossover into current limit while up- and down-
programming capacitive loads, or to limit programming response to a controlled rate. Use the
following equation to calculate the maximum slew rate limit to ensure smooth and linear up- and
down-programming performance.
Max slew rate (V⁄s) = (Current limit setting (A) – Load current (A))/(Load capacitance (F))
The current slew rate determines the rate at which the current changes to a new programmed setting.
This only applies to current settings while operating in current priority mode. When set to MAXimum,
INFinity, or to a very large value, the slew rate will be limited by the unit's listed programming speed
and bandwidth.
Front Panel Menu Reference
Select Output\Advanced\Slew
Then select Voltage or Current
Enter the voltage or current slew rate in the Slew Rate
field.
Check Max slew rate to program the fastest slew rate.
Set the Output Resistance
Output resistance programming is mainly used in battery testing applications and only applies in
voltage priority mode. It is used to emulate the internal resistance of a non-ideal voltage source such
as a battery. Values are programmed in ohms. Refer to the
model-specific resistance programming ranges.
Front Panel Menu Reference
Select Output\Advanced\Resistance.
Specify an Output Resistance value. Then check the
Enable box. Then press Select.
100
SCPI Command
To set the current to +5 amperes:
To set the current to –5 amperes:
SCPI Command
To set the voltage slew rate to 5 V/s
VOLT:SLEW 5
To set the current slew rate to 1 A/s
CURR:SLEW 1
To set the fastest slew rate:
VOLT:SLEW MAX
Supplemental characteristics
SCPI Command
To select a resistance of 0.5 ohms:
VOLT:RES 0.5
To enable output resistance:
VOLT:RES:STAT ON
Keysight RP7970 & RP7980 Series Operating and Service Guide
CURR 5
CURR –5
table for the
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