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When units are connected in parallel, the maximum output resistance is reduced.
The programmable resistance for a single unit must be divided by the total number
of paralleled units.
Set the Output Bandwidth
Voltage compensation
Voltage compensation modes let you optimize output response time with capacitive loads. The
Capacitive Load Boundary
function of DUT capacitance to allow for stable operation. The
effect that the compensation modes have on the small-signal output impedance.
0 Fast (high speed/small capacitive load) – provides the fastest programming speed and transient
response time. Best suited for resistive DUTs with low capacitance. Default frequency = 5000 Hz.
1 Medium (medium speed/medium capacitive load) – provides intermediate programming speed and
transient response time. Best suited for DUTs with higher capacitance with some trade-off in
programming speed and transient response. Default frequency = 450 Hz.
2 Slow (slow speed/large capacitive load) – is best suited for DUTs with high capacitance/low ESR
with the trade-off of slower programming speed and transient response. Default frequency = 12 Hz.
<frequency> specifies the low-pass corner frequency of a filter applied to the programming signal. The
programmed voltage is a digitized signal which passes through a first-order low pass filter where the
pole is specified in Hertz. This filter has the effect of slowing down the output with respect to changes
in the programmed voltage or current.
Specifying the low-pass corner frequency of the filter, in combination with the configurable slew
setting, allows for a trade-off between programming speed and output voltage or current overshoot.
For example, raising the filter frequency increases the programming speed and decreases the settling
time, which may result in output overshoot. Lowering the filter frequency will decrease the
programming speed and increase the settling time, which reduces any output overshoot. The effect of
adjusting the filter frequency also depends on the compensation setting and the load impedance. The
filter frequency setting does not affect the unit's transient response to a load change.
The following table summarizes the effect that the compensation settings have on the CV
Programming Speed Characteristics for all models.
Setting
0 Fast
no load, 0.1%-100% of rating
1 Medium
no load, 0.1%-100% of rating
2 Slow
no load, 0.1%-100% of rating
The following table describes the CV small signal bandwidth characteristics for all models
Keysight RP7970 & RP7980 Series Operating and Service Guide
graphs in the Characteristics section illustrate the minimum ESR as a
Step Conditions
Frequency
100 kHz
100 kHz
100 kHz
4 Using the Regenerative Power System
Output Impedance
graphs illustrate the
Rise/fall time
Settling time
10%-90% of step
to 0.1% of step
0.2 ms
0.5 ms
33 ms
1 ms
2.5 ms
110 ms
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