HP 8590 E-Series, Руководство по калибровке

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57. Non-Harmonic Spurious Outputs , HP 8593EM ,
HP 8594EM , HP 8595EM , HP 8596EM Option 010
Measuring Non-Harmonic Responses
11. On the EMC analyzer , set the center frequency to 9 kHz.
12. Set the microwave spectrum analyzer ST ART FREQ, STOP FREQ, and RES
BW as indicated in the rst row of T able 2-75.
13. Press SINGLE on the microwave spectrum analyzer and wait for the sweep
to nish. Press PEAK SEARCH. If the marker frequency is greater than 2.5
GHz, press PRESEL PEAK and wait for the PEAKING! message to disappear .
14. V erify that the marked signal is not the fundamental or a harmonic of the
fundamental by performing the following steps:
Note that the following steps are for an HP 8566A/B microwave spectrum
analyzer , the steps may be dierent if you are using another microwave
spectrum analyzer .
a. Divide the marker frequency by the fundamental frequency (the EMC
analyzer center frequency setting). F or example , if the marker frequency
is 26.5 kHz and the fundamental frequency is 9 kHz, dividing 26.5 kHz
by 9 kHz yields 2.944.
b. Round the number calculated in step a the nearest whole number . In the
example above , 2.944 should be rounded to 3.
c. Multiply the fundamental frequency by the number calculated in step b .
F ollowing the example , multiplying 9 kHz by 3 yields 27 kHz.
d. Calculate the dierence between the marker frequency and the
frequency calculated in step c above . Continuing the example , the
dierence would be 500 Hz.
e. Due to span accuracy uncertainties in the microwave spectrum analyzer ,
the marker frequency might not equal the actual frequency . Given the
marker frequency , check if the dierence calculated in step d is within
the appropriate tolerance:
F or marker frequencies <5 MHz, tolerance = 6200 kHz
F or marker frequencies <55 MHz, tolerance = 6750 kHz
F or marker frequencies >55 MHz, tolerance = 610 MHz
f. If the dierence in step d is within the indicated tolerance , the signal
in question is the fundamental signal (if the number in step b = 1) or a
harmonic of the fundamental (if the number in step b >1). This response
should be ignored.
2-364 P erformance V erication T ests