HP 8642A Operation And Calibration Manual

Operation Model 8642A/B
Modulation, AM (cont'd)
HP-lB
Codes
3-100
NOTE
With simultaneous internal and external modulation, the external
signals should not cause the AM depth to exceed 99.9%. If this
limit is exceeded, the Signal Generator could go out of lock which
causes queued up Hardware Error messages. Also, the external
AM/PULSE INPUT does not respond linearly to inputs greater
than approximately 1.2 Vpk.
Example
Amplitude modulate the RF output with an external, I Vpk, dc-coupled source, 80'1,
AM depth, at a rate determined by the external source's frequency.
ENTRY
MODULATION SOURCE
ENTRY
LOCAL
(keys)
G
(FDDC)
~
~
(program
AMXD AM 80 PC
codes)
Display
I 171 171 171 171 171 171 171 171 m 7
I U U."-.J U U U U t.J If L
~AEa
.....
80.0PC
LO
AM
DATA
OJ OJ
l ';,' J
_ / U 171 171 T/ ITI
11U.U..JJIII
EXT OC AM~TO
The RF output is being externally amplitude modulated with an external dc-coupled
source (as indicated by the AM, EXT, and DC annunciators). AM depth setting is
80.0% per volt. Modulation frequency is not monitored by the Signal Generator when
an externa I modula tion source is used. The cursor above the A\1 setting indicates AM
is the active function. The LO annunciator may be indicating that the external
modulation source is at a de level (all inputs appear as "LO") or that there is a sinewave
input less than 1 volt.
Keys Codes Keys
Codes
AM AM
INH (EXT DC) AMBO
MOD FREQ MF OFF ON
AMOF, AMON
INT AMNT
0/0
PC
EXT AC
AMXA
kHz
KZ
EXT DC AMXD
Hz HZ
INT + (EXT AC) AMBA SPCL
SP

HP 8642A Specifications

General

Brand	HP
Model	8642A
Category	Inverter
Language	English