Interactive SourceMeter® Instrument Reference Manual Section 2: Ge
2461-901-01 A/November 2015 2-131
You can increase the amount of delay time by either setting a fixed amount of time or setting the
instrument to include an automatic delay. The delay can be from 0 to 10,000 seconds.
If you select an automatic source delay, the delay time depends on the selected range. Values for the
delay times for each range are shown in the following table.
Current range Voltage source
autodelay (ms)
With high
capacitance
(ms)
Current source
autodelay (ms)
With high
capacitance
(ms)
1 µA
10 µA
100 µA
1 10 1 10
1 mA 1 10 1 10
10 mA 1 5 1 5
100 mA 1 5 1 5
1 A 1 5 2 5
4 A 1 5 2 5
5 A 1 5 2 5
For high impedance and high capacitive loads, more settling time is required for the source. The
actual delay period you need can be calculated or determined by trial and error. For purely resistive
loads and at higher current levels, the programmable delay can be set to 0 ms.
The measure time depends on the selected measurement speed. For example, if the speed is set at
0.01 PLC, the measure time would be 167 ms for 60 Hz operation (0.01/60).
Setting the source delay
Using the front panel:
1. Press FUNCTION and set the source and measurement function.
2. Press the MENU key.
3. Under Source, select Settings.
4. Select the button next to Source Delay and enter a value.
5. Click OK.
Using a remote interface:
• SCPI commands: Refer to :SOURce[1]:<function>:DELay (on page 6-89).
• TSP commands: Refer to smu.source.delay (on page 8-183).
Graphing
The graphing features of the Model 2461 allow you to view your measurement data graphically. You
can compare up to four traces on the front panel of the instrument. You can manipulate the graph to
view minimums and maximums, view averages, determine deltas, and view the values of specific
data points.
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