Rel Off; How To Turn Off The Frequency Relative Mode; Hp-Ib Codes; Comments - HP 8642A Operation And Calibration Manual

Model 8642A/B
Operation
Relative
RF
Frequency (cont'd)
REL OFF
How to Turn Off the Frequency Relative Mode
HP-IB
Codes
Comments
Related
Operating
Instructions
[ FREQ I REL OFF ([ SHIFT I (OFF ON I ), or
( FREQ I REF SET (( SHIFT) ( FREQ )) (r<O""' F """F----' O ""N-' - )
Keys Codes Keys Codes
REF SET FRRS GHz GZ
REL ZERO FRRZ MHz MZ
REL OFF FRRF kHz KZ
FREQ FR Hz
HZ
OFF ON FRRSOF, FRRSON
Range of Relative RF Frequency Settings
Allowable settings for the frequency reference when using either the 8642A or 8642B
range from -2115 to 2115 MHz.
(When the relative frequency display is less than or equal to -2000 MHz, the display is
shifted to the right and the I Hz (0.0000001 MHz) digit becomes "hidden" under the "M"
of the MZ terminator. Then, with the cursor over the I Hz digit, the display resembles a
Knob Hold condition because the cursor would be over the "M" of the MZ terminator
during Knob Hold also. Knob Hold is discussed on Page 3-143.)
RF Frequency Settings Interact with Other Instrument Settings
Some settings are limited by the interaction of coupled functions (for example, FM
deviation and RF frequency). Refer to the appropriate Detailed Operating Instruction
for setting limitations, and be aware that any restrictions are due to the absolute output
frequency, not the relative frequency setting.
Relative RF Frequency Sweep
It is not possible to set an RF frequency sweep in relative units.
Refer to RF Frequency (page 3-42) for additional comments that apply to relative
frequency. Also refer to page 3- 42 for information on changing RF frequency by 0.1 Hz
increments (Special Functions 240,241) and for information on incrementing or
decrementing RF output phase in I or 5 degree increments (Special Functions 242
through 245 and 250).
Refer to Knob (page 3-141) and Step, Increment Set (page 3-149) for information on
using these to modify settings.
Refer to Operating Messages (page 3-177) if the instrument displays a message you want
clarified.
Refer to Special Functions (page 3-165) for information about the way these are
accessed.
3-47