Adjustment Procedures
2715 Spectrum Analyzer Service Manual 5-61
This section measures the instrument’sflatness response over the input frequency
range and downloads that response to the instrument. This data is used by certain
CATV measurements to correct for frequency related amplitude errors.
Allow the instrument to warm up for atleast one hour before performing this
procedure.
NOTE. Do not press the help or interrupt keys duri ng the test. Once a test is
interrupted, it cannot be resumedat the point of interruption; it must be
restarted.
Run the Flatness Program. Type the following on the personal computerto begin
the flatness program.
271X<Return>
The 271X program is menu driven andrequires entry of test conditions. You will
be prompted to enter the followingduring the test sequence.
1. Enter your name or your calibration lab’sname.
2. Verifythe date and time.
3. Select the CAL sequence from the Select Sequence menu.
4. Select the type of communicationinterface used by the 2715 (RS--232 or
GPIB).
5. Select “y”if the 2715 has Option 15 installed (EXT LO output on the rear
panel).
6. Enter the 2715 serial number and press <Return>.You will be asked to
verify the serial number.
Flatness Measurement. Complete the following steps to perform the flatness
measurement.
1. Select Flatness Test.
After the flatness test is initiated, the 2715 normalization routine will be
performed. Normalizationrequires approximately 15 minutes to complete.
2. Youwill be prompted to make the connections shown in Figure 5--28(75 Ω)
or Figure 5--29 (50 Ω).
Flatness Measurement