Series 2600B System SourceMeter® instrument Reference Manual Section 2: Sourcing and measuring
2600BS-901-01 Rev. F/August 2021 2-71
Model 2611B, 2612B, 2614B, 2634B, 2635B, and 2636B source setting times
In high-capacitance mode, the frequency compensation capacitance across the measure range
resistors increases. This increase leads to longer settling times on some current measure ranges.
The same range elements that are used to measure current are used to source current. Therefore,
the current limit response times respond in a similar manner.
Current measure and source settling times
High capacitance mode (typical)
1 A to 1.5 A (2611B, 2612B, 2614B, 2634B,
2635B, 2636B)
1 A to 3 A (2601B, 2602B, 2604B)
When high-capacitance mode is enabled, the amount of time to change the current measure range
increases for each SMU. The current measure range and the current limit range are locked together.
Setting the current limit automatically updates the measure range.
Adjusting the voltage source
When driving large capacitive loads with high-capacitance mode enabled, the response time may be
lengthened by the current limit. For example, see the table titled "Current measure and source settling
times" in Understanding source settling times (on page 2-70). If a 1 μF capacitor charges to 10 V in
10 μs with a 1 A limit and the limit is set to 100 nA, the charging time is 100 seconds, as shown in the
following equation.
The total response times while in high-capacitance mode are a combination of the time spent
charging the capacitor (current limit) or the response time, whichever is greater. There is a direct
relationship between the current limit and the charging time. As the current limit decreases, the
amount of time required to charge the capacitor increases.
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