Int; How To Set Cj>M With The Internal Source - HP 8642A Operation And Calibration Manual

Operation Model 8642A/B
Modulation, <PM (cont'd)
Procedu res
INT
200*
100
50
MAXIMUM
25
mM
DEVIATION
12.5
(Radians INT;
6.25
Radians per
volt EXT)
3.125
1.5625
o
78125
o
1
10ll
9
B
7
DIVIDE BANDS
4
8 16 33 65 132 264 528 1057 2115*
RF FREQUENCY (MHz)
Actual band boundaries are listed in Table 3-11
(~B542B
ONLY)
Figure 3-15.
~M
Deviation Limitations for each RF Frequency Band
YOll
can determine whether the Signal Generator will select a divide band or the
heterodyne band. Assume an
RF
frequency of
30
MHz, if you select a deviation of
3
radians, the Signal Generator will use divide band 4 since the maximum possible
deviation for band 4 is 3125 radians (unless Special Function
8,
Prefer Heterodyne Band,
is selected).
If you select a deviation of 25 radians, the Signal Genera
t or will
a utomatically select the heterodyne band. (Note that the maximum possible devia lion
for the heterodyne band is
100
radians.)
Note: Put
the
instrument in its initialized state by selecting
IINSTR PRESED.
<PM can be configured to use either the Signal Generator's internal modulation oscIllator,
an external source, or combinations of the two sources.
How to Set <liM with the Internal Source (lising the Modulation Oscillator)
Source
<PM ( [SHIFT]
COO ) rnIJ
Rate
[fv10DIffEIdJ
and the desired value of modulation frequency (in kHz or Hz).
Deviation
<PM (
[JililFT)
LIM] )
and the desired vallie of <i>fvl deviation in radians (
CEIAU1£J )
3-120