Model 8642A/B
Operation
Modulation, FM (cont'd)
Procedures Note: Put the instrument in its initialized state by selecting [ INSTR PRESET ).
FM can be configured to use either the Signal Generator's internal modulation oscillator,
an external source, or combinations of the two sources.
INT
How to Set FM with the Internal Source (Using the Modulation Oscillator)
Source
rFMi mm
Rate
rMOD FRECT1 and the desired value of modulation frequency (in kHz or Hz).
Deviation
[ FM
J
and the desired value of FM deviation (in MHz, kHz, or Hz).
Example
Frequency modulate the RF output using the internal modulation oscillator, at a 12 kHz
rate,
with 80 kHz FM deviation.
LOCAL
(keys)
(program
codes)
ENTRY
H
MODULATION SOURCE
P^T|
ENTRY
(
MOO I
\
FREO
]
DATA
m en i»i
ENTRY
H
DATA
QD QD RT)
FMNT MF 12 KZ FM 80 KZ*
* These codes are not independent and might need to follow a specific sequence for
entry. Refer to the discussion about Sequence Dependency, which begins on page 3-12 in
the HP-IB portion of this Section III.
Display
IDDH.FR I2.BBHZ B0.0WZ -IH0.0JJII?
The RF output is being internally frequency modulated (as indicated by the FM and INT
annunciators). FM deviation is 80.0 kHz. Modulation frequency is set to 12.00 kHz.
The cursor above the FM setting indicates that FM is the active function.
3-107
To Next Page
