HP 8559A Operation And Service Manual page 66

PERFORMANCE TESTS
FREQUENCY RESPONSE
4-19.
SPECIFICATION:
Frequency response measured with 0 or 10 dB of input attenuation includes input attenuator flatness, mixer
flatness, and band-to-band amplitude variation. Table 4-6 shows the frequency response specifications.
FREQUENCY BAND (GHz)
DESCRIPTION:
Frequency response is checked in each frequency band. With the spectrum analyzer set to full sweep, an RF
input signal is very slowly swept across the entire frequency band. The resulting display is a series of narrow
signals that vary in height across the CRT. Since the RF source is leveled and held flat across each frequency
band, variations in amplitude on the display represent variations in the frequency response of the spectrum
analyzer. Leveling within reasonable limits becomes difficult from 18 GHz to 21 GHz, so the RF output at the
power splitter is characterized and compensated for when making the measurement of this frequency range.
POWER
METER
O
o o
SENSOR
PERFORMANCE TESTS
TABLE 48. FREQUENCY RESPONSE SPEClFiCATiONS
SPECTRUM
ANALYZER
W E E P
OSCILLATOR
0 : = * ; ;
INPUT 50
ATTENUATOR
ADAPTER
SPL l TTER
(CONNECTS
D l RECTLY
TO 20 dB
ATTENUATORI
ADAPTER
FIGURE
FREQUENCY RESPONSE TEST SETUP
Frequency Response
RF
2 1
ADAPTER
MODEL 8559A
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