Agilent Technologies ENA Series Guia do Utilizador Página 327

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Chapter 8 321
Frequency-Offset Measurement (Option 008)
Measurement of Mixers
8. Frequency Offset
Measurement
(Option 008)
NOTE The basic frequency is a frequency range set by the and keys in the
STIMULUS block.
Follow the steps below to set the external signal source frequency.
Step 1. Press -
Frequency Offset to display the “Frequency Offset Menu.”
Step 2. Press
External Source.
Step 3. Set a frequency for the external signal source by using the following softkeys:
NOTE You can use both the Multiplier/Divisor/Offset key and the Start/Stop key to set the
external signal source frequency. The use of the
Multiplier/Divisor/Offset key is
recommended as a rule. This allows you to automatically retain the offset value even if you
have changed the setting range of the basic frequency, since the external signal source
frequency is defined as a formula. Using the
Start/Stop key will set M and O, which can be
determined from the specified frequency and the normal frequency, while maintaining the
preset D.
Procedures for setting external signal source power level
Follow the steps below to set the external signal source power level.
Step 1. Press -
Frequency Offset to display the “Frequency Offset Menu.”
Step 2. Press
External Source to display the “External Source Menu.”
Step 3. Press
Power.
Step 4. Set the power level.
NOTE The mixers conversion loss and reflection coefficients are significantly affected by the
power level variation of the external signal source (LO signal). The
Slope provided in the
“External Source Menu” allows you to set a correction in dB/GHz for the power level
variation that may occur when you change the external signal source frequency.
Softkey Function
Multiplier Sets a multiplier for the basic frequency
Divisor Sets a divisor for the basic frequency
Offset Sets an offset frequency for the basic frequency
Start Sets a start frequency of the sweep range for the external
signal source
Stop Sets a stop frequency of the sweep range for the external
signal source
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