HP 8642A Operation And Calibration Manual

Model 8642A/B
Description
Procedures
REL ZERO
Operation
RELATIVE RF FREQUENCY
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 - 2115 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 fUllction 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.
Note Put the instrument in its initialized state by selecting ( INSTR PRESET I
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
( FREQ ) REL ZERO ( [ SHIFT I (AMPTQJ)
ExampJe
Configure the front-panel display to read each subsequent frequency relative to a
current frequency of 500 MHz.
First select ( INSTR PRESET I and set the RF frequency to 500 MHz, then perform the
following steps.
ENTRY
ENTRY
LOCAL
-------_ .. -
. __ .,-
(keys)
8
8
REl ZERO
(M1PTO 1
-
...
(program
FRRZ
codes)
3-45

HP 8642A Specifications

General

Brand	HP
Model	8642A
Category	Inverter
Language	English