Operation Overview
3.7 Measurements
Each module measures current and voltage of a UUT. The sampling rate is about 12 mS.
Voltage and current measurements are performed with a 15-bit resolution of full scale ratings.
3.8 Slew Rate & Minimum Transient Time
Slew rate is defined by the change in current over time. A programmable slew rate allows a
controlled transition from one load setting to another to minimize the induced voltage drops
on inductive power wiring, or control the induced transients on a test device. If the transient
from one setting to another is large, the actual transient time can be calculated by dividing the
current transition by the slew rate. The actual transition time is defined as the time required
for the change of input from 10% to 90% or from 90% to 10% of the programmed excursion.
If the transition from one setting to another is small, the small signal bandwidth of Load will
limit the minimum transition time for all programmable slew rates. Because of the limit, the
actual transition time is longer than the expected time based on the slew rate. Therefore,
both minimum transition time and slew rate must be considered when determining the actual
transition time. The minimum transition time is from 24 μS to 6 mS that depends on the
slew rate setting.
3.9 Start/Stop Sink Current
To simulate the transient characteristics of load to UUT, the critical problems are when and
how the Load starts sinking current to UUT. You may set the conducting voltage Von to
solve the problems. The Load will start or stop sinking current when the UUT output
voltage reaches the Von voltage. You can start sinking current when the load is ON and the
input voltage of the module is over Von voltage, but stop sinking when load is OFF or the
input voltage is below Von voltage. See Figure 3-7 and 3-8 for start/stop sinking current.
There are two operation modes for Von control, latch and non-latch. Latch means that when
voltage is over Von voltage, Load will start sinking current continuously in spite of input
voltage drop is below Von voltage. Non-latch means that when input voltage is below Von
voltage, Load will stop sinking current. The Von voltage and its operation mode are set in
configuration.
3-9
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