Procedures after Module Replacement R&S SMB
1407.0806.82 2.4 E-5
Adjustment of internal Reference Frequency
The frequency accuracy of the synthesizer is determined (set to internal reference) by a 200 MHz
VTCXO or when the Option R&S SMB-B1 is fitted with a highly stable OCXO 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.
Adjustment
Important: Allow the DUT to warm up for at least 20 minutes before adjustment is executed
Test equipment
- External frequency counter (1 Hz to RF
m
ax
, resolution 0.1 Hz)
Test setup
Connect a calibrated external frequency counter to the reference
output at the rear panel.
Adjustment Setting on DUT:
PRESET
Setup Menu
Protection
Protection Level 2 = 147946 ENTER
Setting on spectrum analyzer (external frequency counter):
MKR SIGNAL COUNT
MKR / NEXT CNT RESOL 0.1 Hz
Adjust the TCXO/ OCXO Calibration Value (Setup -
Reference Oscillator - Calibration Value) for an external
frequency counter reading of 10 MHz, with minimal error.
Press Write value to Eeprom to store the DAC value.
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