2600AS-901-01 Rev. B / September 2008 Return to Section Topics 5-3
Series 2600A System SourceMeter® Instruments Reference Manual Section 5: High-Capacitance Mode
Table 5-1
Models 2601A and 2602A source settling times
Table 5-2
Models 2611A/2612A and 2635A/2636A source settling 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 will respond in a similar manner.
Table 5-3 displays the current measure and current limits in normal mode and high-capacitance
mode.
Table 5-3
Current measure and source settling times
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
Table 5-3. If a 1µF capacitor charges to 10v in
10µs with a 1A limit and the limit is set to 100nA, the charging time will be 100 seconds.
Range Normal mode
High
capacitance
mode
100 mV 50 µs 200 µs
1 V 50 µs 200 µs
6 V 100 µs 200 µs
40 V 150 µs 7 ms
Range Normal mode
High
capacitance
mode
200 mV 50 µs 600 µs
2 V 50 µs 600 µs
20 V 110 µs 1.5 ms
200 V 700 µs 20 ms
Current measure
range
Normal
mode
(typical)
High
capacitance
mode (typical)
1A - 1.5 A (2612A/2636A) 120 µs 120 µs (R
load
> 6Ω)
1A - 3 A (2602A) 80 µs 120 µs (R
load
> 2Ω)
100 mA 100 µs 100 µs
10 mA 80 µs 100 µs
1 mA 100 µs 3 ms
100 µA 150 µs 3 ms
10 µA 500 µs 230 ms
1 µA 2 ms 230 ms
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