S535 Wafer Acceptance Test System Administrative Guide
Section 4: Maintenance
S535-924-01 Rev. B / January 2019
4-13
Editing the icconfig_<QMO>.ini file
The
$KIHOME/IC/icconfig_<QMO>.ini
file is a system configuration file that defines the types of
instruments installed in the S535 system, matrix and terminal configuration, and default system
settings. Your Keithley field service engineer (FSE) configures this file when your system is installed.
The FSE can edit this file to reflect changes in system hardware or to set different default system
settings.
When editing the
icconfig_<QMO>.ini
file (where
<QMO>
is the system QMO number), follow the
guidelines below:
Make a backup copy of the file before making edits.
Use only upper case characters.
Do not use space or tab characters.
Lines should be terminated with newline characters only (\n).
Avoid duplicate entries and assignments.
Using NPLCs to adjust speed and accuracy
You can adjust the amount of time that the input signal is measured. Adjustments to the amount of
time affect the usable measurement resolution, the amount of reading noise, and the reading rate of
the instrument.
The amount of time is specified in parameters that are based on the number of power line cycles
(NPLCs). Each power line cycle for 60 Hz is 16.67 ms (1/60); for 50 Hz, it is 20 ms (1/50).
The shortest amount of time results in the fastest reading rate, but increases the reading noise and
decreases the number of usable digits.
The longest amount of time provides the lowest reading noise and more usable digits, but has the
slowest reading rate.
Settings between the fastest and slowest number of PLCs are a compromise between speed and
noise.
