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Adjustment Procedures
2715 Spectrum Analyzer Service Manual
5-61
This section measures the instrument’s flatness 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 at least one hour before performing this
procedure.
NOTE. Do not press the help or interrupt keys during the test. Once a test is
interrupted, it cannot be resumed at the point of interruption; it must be
restarted.
Run the Flatness Program. Type the following on the personal computer to begin
the flatness program.
271X<Return>
The 271X program is menu driven and requires entry of test conditions. You will
be prompted to enter the following during the test sequence.
1. Enter your name or your calibration lab’s name.
2. Verify the date and time.
3. Select the CAL sequence from the Select Sequence menu.
4. Select the type of communication interface 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. Normalization requires approximately 15 minutes to complete.
2. You will be prompted to make the connections shown in Figure 5--28 (75 Ω)
or Figure 5--29 (50 Ω).
Flatness Measurement