HP 8642A Operating Manual page 146

Operation Model 8642A/B
Modulation, $M (cont'd)
MAXIMUM
$M
DEVIATION 12.5
(Radians INT;
B 2 5
Radians per
v o l t EXT)
DIVIDE BANDS
10X
0.1 4 B IB 33 66 132 2B4 528 1057 2115*
RF FREQUENCY (MHz)
Actual band boundaries are listed in Table 3-11
[KB642B ONLY)
Figure 3-15. 4>M Deviation Limitations for each RF Frequency Band
You 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 3.1 25 radians (unless Special Function 8, Prefer Heterodyne Band,
is selected). If you select a deviation of 2 5 radians, the Signal Generator will
automatically select the heterodyne band. (Note that the maximum possible deviation
for the heterodyne band is 1 00 radians.)
Procedures
Note: Put the instrument in its initialized state by selecting
$ M 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 $M with the Internal Source (Using the Modulation Oscillator)
Source
$M (rsHim rHvn) rwn
Rate
{~rvfOUTRF"QTJ and the desired value of modulation frequency (in kHz or Hz).
Deviation
*
M
( rSHFT~) r n V D ) and the desired value of < * > M deviation in radians ( fTrATJ"%l ).
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