Chapter 2 103
Making Adjustments
15. Frequency Response of the 8590L, 8591C, and 8591E
28.To initialize the area of memory where the flatness correction data is
stored, press the following keys.
INIT FLT
PRESET
FREQUENCY, −2001, Hz
75 Ω input only: AMPLITUDE, More 1 of 2, AMPTD UNITS, dBm
CAL, More 1 of 4, More 2 of 4
SERVICE CAL
FLATNESS DATA
29.To enter flatness corrections, press EDIT FLATNESS.
30.The frequency of the first data point, 4.00 MHz, will be displayed in
the active function block of the analyzer display.
31.Use the data keys on the analyzer to enter the amplitude value for
4 MHz from Column 2 of Table 2-6 (75 Ω input: Column 5),
Frequency Response Errors. Terminate the entry with the
dB key.
When entering negative amplitude values, precede the numeric
entry with the
− and dB keys or the −dB key.
The
BK SP (backspace) key may be used to correct any entry if the
terminator,
dB or −dB key has not been pressed. Re-enter the data if
the terminator has been pressed.
32.Press ⇑ (step-up key) and enter the data from Table 2-6, Column 2
(75 Ω input: Column 5) for the next data point as described in
step 30.
33.Repeat step 30 for the remaining flatness correction data points
listed in Table 2-6.
At each point, verify that the frequency listed in the active function
block corresponds to the frequency at which the data was taken. If
these two frequencies do not correspond, press
⇑ (step up) or ⇓ (step
down) until the proper frequency is displayed in the active function
block.
If some data is incorrect after entering all of the data from Table 2-6,
select the incorrect data point using
⇑ (step up) or ⇓ (step down) and
re-enter the proper data.
34.After all corrections have been input, press the STORE FLATNESS
softkey to store the correction data in nonvolatile memory. The
instrument will automatically preset and display CAL: DONE in the
active function block of the analyzer.
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