« on: October 11, 2019, 09:53:59 am »
I have an 8568B Spectrum analyzer that seems to work displaying frequency.
However when using marker to find that frequency I get an erroneous number.
Example: 760MHz signal is measured as 440MHz.
What circuitry controls these measurements?

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Tektronix TDS7104, DMM4050, HP 3561A, HP 35665, Tek 2465A, HP8903B, DSA602A, Tek 7854, 7834, HP3457A, Tek 575, 576, 577 Curve Tracers, Datron 4000, Datron 4000A, DOS4EVER uTracer, HP5335A, EIP534B 20GHz Frequency Counter, TrueTime Rubidium, Sencore LC102, Tek TG506, TG501, SG503, HP 8568B