Settings To Optimize Performance; Range; Speed - Keithley SourceMeter 2400 Series Quick Results Manual

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
these keys disables auto range.
NOTE

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:
FAST
MED
NORMAL
HI ACCURACY Sets speed to 1.00 PLC and display resolution to 5 -digits.
OTHER
NOTE
and keys are used for manual range selection. Note that pressing either of
Basic ranging information (including the SCPI commands for remote operation) is
covered in "Fundamental source-measure operations."
Sets speed to 0.01 PLC and display resolution to 3 -digits.
Sets speed to 0.10 PLC and display resolution to 4 -digits.
Sets speed to 1.00 PLC and display resolution to 5 -digits.
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.
After setting speed, display resolution can be changed using the DIGITS key.
Quick Results Guide 19