Section 7: Theory of operation Model 2601B-PULSE System SourceMeter Instrument Reference Manual
7-26 2601B-PULSE-901-01A April 2020
Figure 124: Guarded measurements
Measurement settling time considerations
This information applies when the pulser is disabled.
Several outside factors can influence measurement settling times. Effects such as dielectric
absorption, cable leakages, and noise can all extend the times required to make stable
measurements. Be sure to use appropriate shielding, guarding, and aperture selections when making
low-current measurements.
Each current measurement range has a combination of a range resistor and a compensating
capacitor that must settle out to allow a stable measurement. By default (when power is turned on or
after a smua.reset() command), delays are enforced to account for approximately 6 or 6 time
constants of a given range (to reach 0.1 percent of the final value, assuming 2.3 per decade). The
table below lists the current ranges and associated default delays.
Current measure settling time after a voltage step
Time required to reach 0.1% of final value after source level command is processed on a fixed range with a
delay factor set to 1 and compliance set to 100 mA.
Values below for V
OUT
= 2 V unless otherwise noted.
<120 μs (typical) (R
LOAD
>6 Ω)
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