Keysight RP7970 Serie Manuel D'utilisation page 131

Front Panel Menu Reference
Select Output\Sequence\Delay.
Specify the Turn-off delay in seconds.
Repeat for each additional unit.
Specify the Common Delay Offset
There is no need to specify a common delay offset when outputs turn off. Outputs
start executing their turn-off delays as soon as an Output Off command is received
(and any user-programmed turn-off delay has expired).
Specifying a common delay offset lets you accurately synchronize the user-programmed turn-on
delays when sequencing power supplies with different internal delay offsets.
In the figure on the left, you can see how the internal delay offsets are appended to the user-
programmed delay times. The internal delay offsets vary based on priority mode.
Although you cannot eliminate the internal delay offset times, you can specify a common delay offset
to accurately synchronize the user-programmed turn on delays with each other. If in the figure on the
left, you were to program a common delay offset of 10 ms as shown in the figure on the right, that
common delay offset would then supersede the different internal delay times of the coupled units. The
10 ms common offset would in effect synchronize the internal delay of the coupled units.
The common delay offset assures that the user-programmed turn-on delays will be synchronized to
start at the completion of the common delay offset. Query the delay offset of each unit and use the
slowest delay as the common delay offset.
Front Panel Menu Reference
Select Output\Sequence\Couple.
The Max delay offset for this frame field displays the delay
offset of the unit. Enter the delay offset value of the slowest
unit in the Delay offset field in milliseconds. Then press
Select.
Output Turn-On Turn-Off Behavior
The turn-on and turn-off sequences are primarily controlled by three factors: the user-programmed
turn-on/turn-off delays, and the voltage and current priority mode settings.
Keysight RP7970 & RP7980 Series Operating and Service Guide
4 Using the Regenerative Power System
SCPI Command
Program a turn-off delay:
OUTP:DEL:FALL .01
Repeat for each instrument.
SCPI Command
To query the delay offset of the slowest unit:
OUTP:COUP:MAX:DOFF?
Use the delay offset of the slowest unit to specify
the common delay offset
OUTP:COUP:DOFF <value>
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