Section 9
Frequently asked questions (FAQs)
In this section:
How do I optimize performance? .............................................. 9-1
How do I upgrade the firmw
are? .............................................. 9-2
How do I use the Digital I/O port? ............................................ 9-2
How do I trigger other instruments? ......................................... 9-2
How do I generate a service request? ...................................... 9-3
How do I store measurements in nonv
olatile memory? ............ 9-4
When should I change the output off state? ............................. 9-5
How do I make contact check measurements? ........................ 9-5
How do I optimize performance?
There are three primary factors that affect measurement accuracy and speed:
• Warm-up: For rated measurement accuracy, allow the Model 2651A to warm up for at least two
hours before use.
• Speed setting: The Speed setting affects both speed and accuracy (see Setting speed (on page
9-1)).
• Autozero: Autozero can be disabled to increase speed at the expense of accuracy (see
Disabling autozero to increase speed
(on page 9-1)).
Setting speed
To set speed from the front panel:
Press the SPEED key, and then choose the setting based on your requirements:
• Choose the FAST setting for the fastest measurements (note that measurement accuracy will be
reduced).
• For best accuracy, use the HI-ACCURACY setting (note that speed will be reduced).
• To balance accuracy and speed, use the MED or NORMAL setting.
For additional information, including the OTHER setting and remote configuration, refer to Setting
speed (on page 2-72).
Disabling autozero to increase speed
In certain measuring situations, disabling autozero (setting it to OFF) can increase measurement
speed. If autozero is disabled, accuracy will drift with time and temperature.
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