Rohde & Schwarz R&S SMU200A, Руководство по обслуживанию

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R&S SMU200A Troubleshooting
1007.9845.82 3.35 E-6
Error Message - DACIF: PLL unlocked (100 MHz)
Error Error correction
This error message indicates that the
100 MHz PLL on the DACIF board
module is unlocked. The reference
signal for this PLL is supplied by the
SSYN A module. The error also
occurs if this reference signal is
missing. Connect spectrum analyzer to SSYN A X248.
Check that frequency is 12.8 MHz and level is > 6 dBm.
Values correct: Defective connecting cable or continue
troubleshooting on DACIF board.
Values incorrect: Change SSYN A
Frequency Error < 2*10
-6
, Reference Oscillator adjustment
Error Error correction
Internal reference frequency:
Frequency error < 2*10
-6
The frequency accuracy of the synthesizer is determined
(set to internal reference) by a highly stable 10 MHz
quartz oscillator which is adjusted to a calibrated frequency
standard at the R&S factory. This oscillator is subject to
ageing and mostly can be recalibrated, please contact your
R&S representative.
Note : The internal reference can be impaired by up to approx.
±
10
-6
under the menu RF/A Mod - Reference
Oscillator - Adjustment . This setting does not affect
the factory adjustment and can be reset at any time by
means of deactivation. Path B is always synchronized
to Path A.