Spectrum Analyzer Internal Reference Frequency Adjustment - Anritsu Spectrum Master MS2723B Maintenance Manual

2-2 Spectrum Analyzer Function Verification

Spectrum Analyzer Internal Reference Frequency Adjustment

Use this procedure to adjust the internal reference frequency only if the instrument failed the preceding
Spectrum Analyzer Frequency Accuracy verification test. If the instrument still fails the Frequency Accuracy
test after this Internal Reference Frequency adjustment has been completed, then replace the Main/SPA PCB
assembly (refer to "Removal of the Spectrum Analyzer PCB" on page
Procedure:
1. Connect the external 10 MHz Reference to the Anritsu MG3692x Synthesized Signal Generator, as
shown in Figure
Note Do not connect the external 10 MHz Reference to the MS2723B or to the MS2724B.
2. Connect the MG3692x output to the Spectrum Analyzer RF In of the MS2723B or MS2724B.
3. Set the MS2723B or MS2724B to Spectrum Analyzer mode and then preset the instrument.
4. Set the MG3692x output to 7 GHz with an RF output level of –30 dBm.
5. On the MS2723B or MS2724B, press the Amplitude soft key and set the Reference Level to –10 dBm.
6. Set the Atten Lvl to 0 dB.
7. Press the Freq soft key and set the Center Freq to 7.0 GHz.
8. Press the Span soft key, enter 10 kHz.
9. Press the BW soft key and set the RBW to 100 Hz.
10. Press the VBW soft key and set to 30 Hz.
11. Press and hold the Shift key and press the 4th, 6th, and 8th (below Esc) soft keys together
(simultaneously) to enter into Service Mode on the MS2723B or MS2724B
MS272xB Service Mode
Figure 2-2.
12. Press the Service Menu soft key, then the APP Service soft key.
13. Press the Calibration soft key, then the 10 MHz Ref soft key.
14. Use the Up/Down arrow keys or the rotary knob to slowly adjust the displayed signal to the center of the
display. Allow the signal to stabilize between adjustments, and repeat as necessary.
15. Turn the MS2723B or MS2724B Off, and then back On to exit Service Mode.
2-4
2-1.
PN: 10580-00165 Rev. D
Performance Verification
3-5).
(Figure 2-2).
Shift Key
Soft Keys
4, 6, and 8
Models MS2723B and MS2724B MM