User`s guide

Chapter 3 93
Operation
Using 8561A/62A/62B Spectrum Analyzers
Operation
Amplitude Calibration
Enter the conversion loss table at the preset frequencies from either the calibration label
on the bottom of the 11974 or the supplied calibration sheet, by using the following key
sequence. (Note: the analyzer automatically interpolates between the preset frequencies.)
EXT
AMPTD CORRECT
CNV LOSS VS FREQ
Enter the conversion loss value of the indicated preset frequency, then terminate the
entry with
dB.
Advance to the next preset frequency by pressing
⇑ and enter the conversion loss of the
indicated frequency. Continue until the highest frequency is reached, then use the
⇑ and
⇓ keys to scan through the frequencies to verify or edit the conversion-loss values
entered.
NOTE For V band, it may be necessary to first use the following key sequence to
initialize the average of the conversion loss versus frequency table near the
values for this band.
EXT
AMPTD CORRECT
AVERAGE CNV LOSS
Enter 47 and terminate with dB.
Preselector Peaking
There is no
PRESEL AUTO PK or PRESEL MAN ADJ softkey function for the 8561A/62A/62B,
when in the external mixing mode. Therefore, to maximize the amplitude of the desired
signal, use an adjustment tool to vary the corresponding low-frequency potentiometer
located on the rear panel. The low-frequency potentiometer for mixer bands are listed
below:
for an 11974A: “26.5 GHz SET”
for an 11974Q: “33.0 GHz SET”
for an 11974U: “40.0 GHz SET”
for an 11974V: “50.0 GHz SET”