B-2 Return to Section Topics 2600S-900-01 Rev. C / January 2008
Appendix B: Frequently Asked Questions Series 2600 System SourceMeter
®
Instruments User’s Manual
How do I optimize performance?
Reference See “Operation considerations” in Section 4 and “Speed” in Section 6 of the Series
2600 Reference Manual for detailed information on performance factors that affect
measurement speed and accuracy.
There are three primary factors that affect measurement accuracy and speed:
• Warm-up – For rated measurement accuracy, allow the Series 2600 to warm up for at least
one hour before use.
• Speed setting – The Speed setting affects both speed and accuracy.
• Auto zero – Auto zero can be disabled to increase speed at the expense of accuracy.
Setting speed
Press the SPEED key, then choose the setting based on your requirements:
• Choose the FAST setting for the fastest measurements, but measurement accuracy will be
reduced.
• For best accuracy, use the HI ACCURACY setting, but speed will be reduced.
• To compromise between accuracy and speed, use the MED or NORMAL setting.
Disabling auto zero to increase speed
In certain measuring situations, disabling auto zero can increase measurement speed, but
accuracy will drift with time. To disable auto zero, select CONFIG > MEAS > AUTO-ZERO, then
set to OFF. To minimize drift with auto zero disabled, use the ONCE selection just before
measuring.
How do I use the Digital I/O port?
Reference See Section 10 of the Series 2600 Reference Manual for complete details on the
Digital I/O port.
Digital I/O port terminals
The Digital I/O port, located on the rear panel (Figure 1-2 on page 1-6), provides 14 digital I/O lines
(Figure B-1). Each output can be set high (+5V) or low (0V), read high or low logic levels, and can
be set up for triggering. Make connections using a cable with a Male DB-25 connector (Keithley
Instruments part number CA-126-1).
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