A-6 Return to Section Topics 2600AS-900-01 Rev. B / September 2008
Appendix A: Frequently Asked Questions Series 2600A System SourceMeter
®
Instruments User’s Manual
For the above printbuffer function, 1 is the starting index for values to output, rb1.n is the
ending index (
n = the number of readings in the buffer, which in this case is 3), rb1 includes the
measured readings,
rb1.timestamps includes the timestamps, and rb1.sourcevalues
includes the source values.
Example output:
1.234567e-03, 5.555555e-02, 1.000000e+00, 2.362360e-03, 8.888888e-02,
1.000000e+00, 2.362368e-03, 1.111111e-01, 1.000000e+00
The above output is returned in the following order:
reading1, timestamp1, sourcevalue1, reading2, timestamp2, sourcevalue2, reading3, timestamp3,
sourcevalue3
See Step 3 of Running a factory script for more examples on reading the buffer.
Step 4: Save the data
After the measurements are complete, you can save the reading buffer data to the nonvolatile
memory in the instrument.
To save the reading buffer data:
1. From the front panel, press STORE and then choose SAVE.
2. Select INTERNAL to save to internal nonvolatile memory.
3. Select one of the following:
• SMUA-BUFFER1
• SMUA-BUFFER2
• SMUB-BUFFER1
• SMUB-BUFFER2
4. The front panel displays Saving... This may take awhile.
5. Press the EXIT key to return to the main menu.
How do I stack channels to output higher voltage?
The maximum output voltage of a Model 2601A or Model 2602A channel is 40.4, and the
maximum output voltage of a Model 2611A/2612A or 2635A/2636A channel is 202V. Higher
voltage can be output by stacking (connecting in series) channels.
Stacking channels requires that all SMU channels (except one) float off earth ground. Figure A-3
shows two Model 2602As configured with the four channels connected in series to output up to
161.6V (40.4V per channel). Additional channels can be added (stacked), but the LO terminal of
any SMU channel in the stack must never exceed 250V with respect to earth ground.
WARNING The maximum floating (common mode) voltage for a SMU is ±250V.
Exceeding this level may cause damage to the instrument and
create a shock hazard.
Whenever hazardous voltage (>30 V RMS, 42 V peak) will be output, a safety shield must
completely surround the DUT test circuit. When using a metal safety shield, it must be connected
to a known safety earth ground and chassis ground.
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