Table 6-3
Digits commands
Command
1
Description
display.smuX.digits = display.DIGITS_4_5
display.smuX.digits = display.DIGITS_5_5
display.smuX.digits = display.DIGITS_6_5
Set display to 4.5 digits.
Set display to 5.5 digits.
Set display to 6.5 digits.
1. smuX = smua for the Model 2601/2611; smuX = smua (Channel A) or smub (Channel B) for the
Model 2602/2612.
6-8
Range, Digits, Speed, Rel, and Filters
Series 2600 System SourceMeters Reference Manual
2600S-901-01 Rev. A / May 2006
Return to
Digits programming example
smua.reset()
--Restore Series 2600
defaults.
display.smua.digits = display.DIGITS_5_5
--Select 5.5 digits.
Speed
The SPEED key is used to set the integration time, or measurement aperture, of
the A/D converter (period of time the input signal is measured). The integration
time affects the usable digits, the amount of reading noise, and the ultimate
reading rate of the instrument. The integration time is specified in parameters
based on the Number of Power Line Cycles (NPLC), where 1 PLC for 60Hz is
16.67msec (1/60) and 1 PLC for 50Hz is 20msec (1/50).
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).
Summary of Contents for SourceMeter 2600 Series
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