R&S SMB Troubleshooting
1407.0806.82 3.31 E-6
Error Messages Concerning the Reference Oscillator Module
Error message Error correction
" OCXO 10 MHz oven cold If this message does not disappear after 10 minutes,
OCXO is defective, change the module.
"Synchronization error on internal
reference"
Switch the R&S SMB to external Reference and
supply a 10 MHz 10 dBm signal to the Reference
Input of the RF BOARD. If the error disappears and
the R&S SMB is working correct the OCXO is
defective, change the module.
"OCXO: cannot read EEPROM data"
"OCXO: cannot store adjustment data"
This indicates problems concerning the data transfer
from and to the EEPROM of the module. If changing
the module does not help, change the RF Board
module.
Frequency Error,
Reference Oscillator Adjustment
Error Error correction
Internal reference frequency:
Frequency error greater than limit
given in datasheet
The frequency accuracy of the synthesizer is determined
(set to internal reference) by a highly stable oven controlled
10 MHz quartz oscillator that is set to a calibrated frequency
standard at the R&S factory. This oscillator is subject to
ageing and hence its output frequency can be adjusted (see
chapter 2 “Internal Counter Reference Oscillator
Adjustment”).
Note: The internal reference can be tuned by up to approx.
±
10
-6
under the menu Setup - Reference Oscillator -
Adjustment. This setting does not affect the factory
adjustment and can be reset at any time by means of
deactivation.
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