Fig 1-7 Rise Time Transition Limitation - Prodigit 34000A Series Operation Manual

1.1.6. Slew Rate
Slew rate is defined as the change in current or voltage over time. A programmable slew rate
allows for a controlled transition from one load setting to another. It can be used to minimize
induced voltage drops on inductive power wiring, or to control induced transients on a test device
(such as would occur during power supply transient response testing).
In cases where the transition from one setting to another is large, the actual transition time can be
calculated by dividing the voltage or current transition by the slew rate. The actual transition time
is defined as the time required for the input to change from 10% to 90% or from 90% to 10% of
the programmed excursion.
In cases where the transition from one setting to another is small, the small signal bandwidth (of
the load) limits the minimum transition time for all programmable slew rates. Because of this
limitation, the actual transition time is longer than the expected time based on the slew rate, as
shown in Figure 1-7
Note ： 34105A ～ 34115A minimum transition time is 66.7μS,34120A ～ 34130A minimum
transition time is 24μS,34200A and 34300A minimum transition time is 20μS.

Fig 1-7 Rise Time Transition Limitation

Therefore, both minimum transition time and slew rate must be considered when determining the
actual transition time.
Following detail description is excluding in specification sheet.
The minimum transition time for a given slew rate as about a 30% or greater load change,
The slew rate increases from the minimum transition time to the Maximum transition time at a
100% load change. The actual transition time will be either the minimum transition time, or the
total slew time (transition divided by slew rate), whichever is longer.
EX: 34210A 600V/320A/10000W (CCH - CCL >320Ax 30%)
Use the following formula to calculate the minimum transition time for a given slew rate min
transition time=96A/slew rate (in amps/second).
6uS (96A/16) x 0.8(10%~90%) =4.8uS
Use the following formula to calculate the maximum transition time for a given slew rate max
transition time=320/slew rate (in amps/second).
20uS (320A/16) x 0.8(10~90%) = 16uS
EX. CCH=64A, CCL=0A Slew Rate =16A, the expected time is 3.2uS but the actual Transition Time
Will be limited to 4.8Us.
4uS (64/16 x 0.8(10%~90%) = 3.2uS
34000A Series Operation Manual 9