Section 3 MS2667C
3-22
(5) 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. (Press
keys “3”+“6”+“0”+“0”+“Enter”)
5) Adjust the variable resistor R27 on the 2nd CONVERTER (refer to Fig. 3-2-5) to make multimeter reading -3.600
±0.005 Volts.
6) Set YTF Pre-tuning value to 7600 by pushing “F2” key. (Press keys “7”+”6”+“0”+“0”+“Enter”)
7) Adjust the variable resistor R30 on the 2nd CONVERTER (refer to Fig. 3-2-5) 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.
(6) YTF tuning adjustment
1) Keep key “Preset” depressed while Switching ON the spectrum analyzer.
2) Wait till sweep of the spectrum analyzer starts and after that Switch OFF the power supply of the spectrum
analyzer.
3) Now once again keep key “0” depressed while switching on the spectrum analyzer.
4) Initialize the spectrum analyzer (Press key “preset”, followed by Key “F1”).
5) Set the spectrum analyzer to :
Center frequency : 3.2 GHz
Span : 200 MHz
6) Set 6769B Signal generator output to :
Frequency : 3.2 GHz
RF level : -10 dBm
7) Enter Cal menu by pushing “Shift” + “0” keys. Open the second page of Cal menu (press the key “more”), and
enter Maintenance menu with “F6” key.
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