Rohde & Schwarz 1164.4391.03, Service Manual

Page: 182 / 254

Troubleshooting R&S FSP
1164.4556.82 3.78 E-1
Normal action Error and error cause
Upon successful reading of the module header
from the EEPROM the contents of the module
header is entered into the array for storing the
module information. The module header read
from the EEPROM is compared with the module
header of the associated binary file. If the module
header can be read from the file and agrees with
the header read from the EEPROM it is assumed
that the contents of the module EEPROM has
already been mapped in the binary file. The
calibration data can thus be written from the file to
the RAM.
If however the associated file cannot be found or
if the module header of the EEPROM differs from
that of the file, the total EEPROM contents must
be written to the RAM and then saved in the
binary file.
Error finding file of IF Filter
After loading the calibration data from the
EEPROMs, the calibration data are loaded from
the calibration data files (e.g. DDC settings for
various filters). First the relevant calibration data
file is written to the calibration data memory.
If an error occurs upon loading the file into the
memory, an error message is output:
Error reading file of DDC Filter
Upon successful loading of the calibration data file
the latter is compared with its backup copy on the
hard disk.
After loading the calibration data from the
EEPROMs and files, the data collected during the
last calibration are loaded from the ‘rdf_cal.bin’ file
into the calibration data memory. This process
takes only place if valid calibration data (and the
‘rdf_cal.bin’ file) are available.
If there are no valid calibration data, the status
message "UNCAL " is output informing the user
that the instrument is uncalibrated.