Quick Results Guide 19
Settings to optimize performance
Range
To achieve best accuracy, the SourceMeter should be on the lowest possible measurement
range. In most situations, auto range can be used to automatically select the best range.
Auto range is controlled (enabled/disabled) by the AUTO range key (AUTO annunciator
indicates auto range is enabled).
RANGE and keys are used for manual range selection. Note that pressing either of
these keys disables auto range.
NOTE Basic ranging information (including the SCPI commands for remote operation) is
covered in “Fundamental source-measure operations.”
Speed
Measurement speed is set by setting the integration time of the A/D converter (period of
time the input signal is measured). Integration time affects the usable digits, reading noise,
and the ultimate reading rate of the instrument. It 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 and 400Hz is 20msec (1/50).
In general, the fastest speed setting (FAST; 0.01 PLC) results in increased noise and fewer
usable display digits. The slowest speed (HI ACCURACY; 10 PLC) provides the best
common-mode and normal-mode noise rejection. In between settings are a compromise
between speed and noise.
Press SPEED and select one of the following speed setting options:
NOTE After setting speed, display resolution can be changed using the DIGITS key.
FAST Sets speed to 0.01 PLC and display resolution to 3H-digits.
MED Sets speed to 0.10 PLC and display resolution to 4H-digits.
NORMAL Sets speed to 1.00 PLC and display resolution to 5H-digits.
HI ACCURACY Sets speed to 10.0 PLC and display resolution to 6H-digits.
OTHER Use to set speed to any PLC value from 0.01 to 10. Display resolution is
not changed after speed is set with this option.
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