Anritsu MS2665C - Page 28

Section 2 MS2665C
2-20
(3) YTF tuning DAC adjustment
1) Turn the spectrum analyzer on, while pushing “0” key, and initialize the spectrum analyzer.
2) Set the spectrum analyzer to zero Span.
3) Enter Cal menu by pushing “Shift + 0” keys. Open the second page of the Cal menu, and enter Maintenance menu
with “F6” key. Enter RF/Micro converter maintenance menu with “F2” key, and open the 6th page of the menu
(Press “More” key 5 times).
4) Set YTF Pre-tuning value to 3600 by pushing “F2” key (assigned YTF Pre-tuning function) and data keys.
5) Adjust the variable resistor R60 on the A13 MICRO CONVERTER (refer to Fig. 2-2-6) to make multimeter
reading -3.600 ±0.005 Volts.
6) Set YTF Pre-tuning value to 7600 by pushing “F2” key.
7) Adjust the variable resistor R57 on the A13 MICRO CONVERTER (refer to Fig. 2-2-6) to make multimeter
reading -7.600 ±0.005 Volts.
8) Repeat the procedure 4), 5), 6), 7) until you get the required voltage corresponding to each YTF Pre-tuning value.
(4) YTF tuning adjustment
1) Initialize the spectrum analyzer (Press “Preset” key and press “F1” key).
2) After 5 seconds waiting, set the spectrum analyzer to :
Center frequency, 2.92 GHz
Zero Span
Set the 6769B output to :
Frequency, 2.92 GHz (CW)
RF LEVEL, -20 dBm
3) Enter Cal menu by pushing “Shift + 0” keys. Enter Pre-selector Tuning menu with “F6” key.
4) Press “F2” key and set Pre-selector bias value to 0, using the data keys or the knob on the front panel.
5) Adjust the variable resistor R22 on A13 MICRO CONVERTER (refer to Fig. 2-2-6) to make displayed signal
level maximum.
6) Set the spectrum analyzer to :
Center frequency, 6.4 GHz
Zero Span
Set the 6769B output to :
Frequency, 6.4 GHz (CW)
RF LEVEL, -20 dBm