Relative Rf Frequency 3 - 4; Rel Zero 3 - 4 - HP 8642A Operating Manual

Model 8642A/B Operation
RELATIVE RF FREQUENCY
Description Relative Frequency mode enables you to display the output frequency relative to a
reference frequency. This function could be useful, for example, in setting a current
frequency to be displayed as an offset from an IF frequency.
Settings for the relative frequency mode range from - 2 1 1 5 to 2115 MHz.
The Reference Set function sets the current display to read as an offset from a specific
frequency reference. (The Reference Set function can also be used to display the current
frequency reference.) The Relative Zero function sets the current frequency setting to
be the frequency reference.
Once a frequency reference is selected, all subsequent frequency entries are displayed as
relative frequencies in terms of MHz above or below the frequency reference. This
condition exists until the Relative Frequency mode is turned off.
The output frequency is equal to the displayed frequency plus the reference frequency.
Procedures Note: Put the instrument in its initialized state by selecting [ INSTR PRESET!.
REL ZERO
How to Set the Current Output Frequency Setting to Be the Frequency Reference
Setting the current output frequency as the frequency reference causes the frequency
setting display to become 0.000000 MHz relative:
r T H K T I REL ZERO (I SHIFT I fAMPTDH ).
Example
Configure the front-panel display to read each subsequent frequency relative to a
current frequency of 500 MHz.
First select fiNSTR P R E S E T ! and set the RF frequency to 500 MHz, then perform the
following steps.
LOCAL
(keys)
ENTRY
JFREQ] 1 SHIFT 1
ENTRY
REL ZERO
[AMPTD]
F R R Z
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