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SCPI Commands for Digital Interfaces
TM-XDOP-01XN 4–41
Slew Rate
The slew rate is calculated as a function of change in the output voltage and a
given time interval. The maximum slew rate is 1% V rating/150us. The slew rate
is saved upon power off and restored at power on. Output ON/OFF and shutdown
are not affected by the programmable slew rate. These functions have a slew rate
of 1%/20ms. For more information on setting slew rates, see “Slew Rate” on
page 3–49.
The SCPI commands for changing the voltage slew rate are:
:VOLT:SLEW:STEP {<slewrate-voltage> | MAX | MIN | DEF}
where voltage-step has the units V, mV, etc.
and the range is 0.1% to 5% of rated voltage.
default step is 0.1% of rated output voltage.
:VOLT:SLEW:INTerval {<slewrate-interval> | MAX | MIN | DEF}
where time interval has the units s, ms, or us
and the range is 150 us to 1.5s
default interval is 150us.
The combination must not exceed 1% V rating/150us. Though the software will
attempt to achieve higher slew rates, it is limited to this value by hardware
constraints. Manufacturer's recommendation is to keep the slew rate at or below
the default value.
Example:
Set a slew rate of 100V/10s for a 100V-60A power supply.
This slew rate is 1V/0.1s, which is within the acceptable range.
Send the commands:
":VOLT:SLEW:STEP 1",
and
":VOLT:SLEW:INT 100ms"
CAUTION
Check both the voltage step and the interval to ensure you get the required slew rate.
TM-XDOP-01XN.book Page 41 Monday, July 17, 2006 11:19 AM