Keithley System SourceMeter 2601B, Справочное руководство

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Series 2600B System SourceMeter® Instrument Reference Manual Section 3: Functions and features
2600BS-901-01 Rev. B / May 2013 3-67
Understanding source settling times
Each Series 2600B source-measure unit (SMU) can drive up to 50
µ
F of a capacitance in
high-capacitance mode. In order to accomplish this, the speed of the Series 2600B SMU is reduced.
Source settling times increase when high-capacitance mode is enabled. The following tables
compare the source settling times in normal and high-capacitance modes.
Model 2601B/2602B/2604B source settling times
Range Normal mode High capacitance mode
100 mV
50
µ
s 200
µ
s
1 V
50
µ
s 200
µ
s
6 V
100
µ
s 200
µ
s
40 V
150
µ
s
7 ms
Model 2611B/2612B/2614B/2634B/2635B/2636B source
settling times
Range Normal mode High capacitance mode
200 mV
50
µ
s 600
µ
s
2 V
50
µ
s 600
µ
s
20 V
110
µ
s
1.5 ms
200 V
700
µ
s
20 ms
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.
Current measure and source settling times
Current measure range Normal mode
(typical)
High capacitance mode (typical)
1 A - 1.5 A
(2611B/2612B/2614B/2634B/2635B/2636B)
120
µ
s 120
µ
s (Rload > 6
Ω
)
1 A - 3 A (2601B/2602B/2604B)
80
µ
s 120
µ
s (Rload > 2
Ω
)
100 mA
100
µ
s 100
µ
s
10 mA
80
µ
s 100
µ
s
1 mA
100
µ
s
3 ms
100
µ
A 150
µ
s
3 ms
10
µ
A 500
µ
s
230 ms
1
µ
A
2 ms 230 ms
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.