Anritsu S412E - Page 23

Chapter 3 — Spectrum Analyzer Verification 3-2 Frequency Accuracy Verification and Adjustment
S412E MM PN: 10580-00324 Rev. N 3-3
the measured value in Table A-7. Skip Step 17 through Step 19 and proceed to Step 20. If the marker
frequency is outside the specification, proceed to the next step for adjustment.
17. Perform Step 17 through Step 19 only if the previous step is out of specification. Press and hold the Shift
key while simultaneously pressing the 9-5-3 keys all at once. Three quick beeps sound and the Frequency
Calibration soft key is then displayed.
18. Press the Frequency Calibration soft key. The 10 MHz Ref DAC number will be shown and can be adjusted
to bring the marker frequency within specification. Larger DAC numbers decrease the measured
frequency and smaller DAC numbers increase the measured frequency.
19. Adjust the DAC number by entering a new DAC value and pressing the Decimal soft key. The instrument
will take a few seconds to update and then the peak can be remeasured using Marker, Peak Search. The
System menu returns the Frequency Calibration soft key if readjustment is necessary. Continue
adjusting the DAC value until the peak search marker value is within specification. After the
instrument is adjusted, turn the instrument power off and back on to remove the Frequency Calibration
soft key. Record the marker frequency in Table A-7, “Spectrum Analyzer Frequency Accuracy”
on page A-5.
20. If Option 6 is installed, adjust the center frequency of the S412E and the frequency on the MG3692x to
the frequencies in Table A-7, and record the measured results for the other frequencies in Table A-7.
Note
The following steps to adjust the frequency accuracy can be performed on instruments with
application package version 1.12 or greater. The application package version can be found in the
System > Status menu as “Package Version”.
Note
If the instrument fails this test, contact your local Anritsu Service Center
(http://www.anritsu.com/Contact.asp)