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4 Using the Regenerative Power System
When the unit is in current or power 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 Output Power
In power priority mode, you can specify a positive or negative output power level, which will be
maintained as long as the output voltage and current remain within their programmed limits.
Front Panel Menu Reference
Select Output\Settings\Power.
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.
The power slew rate setting affects programmed power priority changes, including those due to the
output state turning on or off. 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 Current, Power, or Voltage
Enter the current, power, or voltage slew rate in the Slew
Rate field.
Check Max slew rate to program the fastest slew rate.
108
SCPI Command
To set the current to +5 A:
CURR 5
To set the current to –5 A:
CURR –5
SCPI Command
To set the power to +15 kW:
To set the power to –15 kW:
SCPI Command
To set the current slew rate to 1 A/s
CURR:SLEW 1
To set the power slew rate to 100 W/s
POW:SLEW 1
To set the voltage slew rate to 5 V/s
VOLT:SLEW 5
Keysight RP7970 & RP7980 Series Operating and Service Guide
POW 15000
POW -15000
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