96 Chapter2
Making Adjustments
15. Frequency Response of the 8590L, 8591C, and 8591E
15. Frequency Response of
the 8590L, 8591C, and 8591E
This adjustment applies to:
8590L spectrum analyzers
8591E spectrum analyzers
8591C cable TV analyzers
The frequency response (flatness) of the analyzer is measured with the
corrections off. The source is adjusted to place the displayed signal at
the analyzer center horizontal graticule line.
The flatness data is then entered into the analyzer using the
SERVICE
CAL functions. The error corrections are stored in battery backed RAM
on the A16 processor/video assembly.
For analyzers equipped with 75 Ω inputs, the 50 Ω system is
characterized before starting the “Frequency Response” adjustment
procedure.
Equipment Required
Synthesized sweeper
Measuring receiver (used as a power meter)
Frequency synthesizer
Power sensor, 1 MHz to 1.8 GHz
Power splitter
Adapter, Type N (f) to APC 3.5 (m)
Adapter, Type N (m) to Type N (m)
Cable, BNC, 122 cm (48 in.)
Cable, Type N, 183 cm (72 in.)
Additional Equipment for 75 Ω Inputs
Power meter
Power sensor, 75 Ω
Cable, BNC, 120 cm (48 in) 75 Ω
Adapter, Type N (f) 75 Ω to Type N (m) 50 Ω
Adapter, Type N (m) to BNC (m), 75 Ω
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