HP 8642A Operation And Calibration Manual

Operation
Model 8642A/B
Modulation, FM (cont'd)
HP-IB
Codes
Comments
3-110
Example
Frequency modulate the RF output with an external, I Vpk, dc-coupled source, 80 kHz.
per volt FM deviation, at a rate determined by the external source's frequency.
ENTRY
MOOULATION SOURCE ENTRY DATA
LOCAL
(keys)
0
(moe]
0
OJ OJ
W
mV
~
(program
FMXD FM 80 KZ·
codes)
* 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
I 0 0.0 0 0 0 0 0 m z
FREQ
FM
_ j U f"il f"il T/ m
I 1 lU.lU.lJ 1/
DC AMPTD
The RF output is being externally frequency modulated with an external dc-coupled
source (as indicated by the FM, EXT, and DC annunciators). FM deviation setting is 80.0
kHz.
per volt. Modulation frequency is not monitored by the Signal Generator when an
external modulation source is used. The cursor above the FM setting indicates FM is the
active function.
Keys
Codes
Keys
Codes
FM FM
INT + (EXT DC) FMBD
MOD FREQ MF
OFF ON
FMOF, FMON
INT
FMNT
MHz
MZ
EXT AC FMXA kHz KZ
EXT DC
FMXD
Hz HZ
INH (EXT AC) FMBA
SPCL SP
External Modulation
External modulation frequency is not monitored by the Signal Generator. Therefore, if
the external FM source violates the maximum deviation relationships shown in Table
3-20 on page 3-112, the Signal Generator will be operating beyond its specified limits
and could lose phase lock which causes queued up Hardware Error messages.
Modulation Types Not Possible During RF Frequency Sweep
During Stepped Frequency Sweep, FM and q,;\1 are allowed in manual or single sweep
mode only.
During Phase Continuous Frequency Sweep (Special Function 123), all
modula tion types are possible.

HP 8642A Specifications

General

Brand	HP
Model	8642A
Category	Inverter
Language	English