2600S-901-01 Rev. C / January 2008 Return to Section Topics 6-7
Series 2600 System SourceMeter® Instruments Reference Manual Section 6: Range, Digits, Speed, Rel, and Filters
In general, the fastest integration time (FAST; 0.01 PLC) results in the fastest reading rate, but at
the expense of increased reading noise and fewer usable digits. The slowest integration time (25
PLC) provides the best common-mode and normal-mode noise rejection, but has the slowest
reading rate. In-between settings are a compromise between speed and noise. The default power-
on speed setting is NORMAL (1 PLC).
Setting speed
Speed is set from the SPEED configuration menu and is structured as follows.
SPEED configuration menu
Press SPEED (or use the CONFIG menu) to display the menu:
• FAST — Sets speed to 0.01 PLC and sets display resolution to 4-1/2 digits.
• MED — Sets speed to 0.10 PLC and sets display resolution to 5-1/2 digits.
• NORMAL — Sets speed to 1.00 PLC and sets display resolution to 5-1/2 digits.
• HI ACCURACY — Sets speed to 10.00 PLC and sets display resolution to 6-1/2 digits.
• OTHER — Used to set speed to any PLC value from 0.001 to 25. Display resolution is not
changed when speed is set with this option.
NOTE The SPEED setting affects all measurement functions. After setting
speed, display resolution can be changed using the DIGITS key. For
the Model 2602/2612 single-channel display mode, pressing the
SPEED key for the channel not being displayed will result in a display
message to change to the other channel before setting speed.
Remote speed programming
Speed command
Table 6-4 summarizes commands to control speed. See Section 12 for more information.
Table 6-4
Speed command
Command
1
Description
smuX.measure.nplc = nplc Set speed (nplc = 0.001 to 25).
2
1. smuX = smua for the Model 2601/2611/2635; smuX = smua (Channel A)
or smub (Channel B) for the Model 2602/2612/2636.
2. The speed setting is global and affects all measurement functions.
Speed programming example
Use the NPLC command to set the speed. For example, send the following parameter to set the
speed to 10 PLC:
smua.reset()
--Restore Series 2600 defaults.
smua.measure.nplc = 10
--Set NPLC to 10.
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