HP 8642A - Page 129

Operation
Model 8642A/B
Modulation, AM (cont'd)
HP-IB. Sequence Dependency
AM settings are sometimes coupled with Attenuator Range Hold (Special Function 9)
or amplitude settings. Therefore, HP-IB codes may need to be entered in a particular
sequence when accessing combinations of these functions. Refer to the discussion
about Sequence Dependency, which begins on page 3-12 in the HP-IB portion of this
Section HI.
Maximum Combinations of Amplitude and AM
When amplitude settings exceed +14.0 dBm (1.12V, 121.0 dBuV, 2.25 EMF V, and
127.0 dB EMF uV), the AM depth setting is limited to those settings listed below in
Table 3-18.
Table 3-18. Limitations on AM Settings with Amplitude (1 of 2)
Maximum
AM Depth
(%)
99.9
97.2
95.0
92.8
90.5
88.4
86.2
84.1
82.0
79.9
77.8
75.8
73.8
71.8
69.8
67.9
66.0
64.1
62.2
60.3
58.5
56.7
54.9
53.1
dBm
-140.0 to 14.0
14.1
14.2
14.3
14.4
14.5
14.6
14.7
14.8
14.9
15.0
15.1
15.2
15.3
15.4
15.5
15.6
15.7
15.8
15.9
16.0
16.1
16.2
16.3
V
0.000023 to 1.12
1.14
1.15
1.16
1.18
1.19
1.20
1.22
1.23
1.25
1.26
1.27
1.29
1.30
1.32
1.33
1.35
1.37
1.38
1.40
1.41
1.43
1.45
1.46
Amplitude
dB u\l
-33.0 to 121.0
121.1
121.2
121.3
121.4
121.5
121.6
121.7
121.8
121.9
122.0
122.1
122.2
122.3
122.4
122.5
122.6
122.7
122.8
122.9
123.0
123.1
123.2
123.3
EMFV
0.000046 to 2.25
2.29
2.31
2.33
2.37
2.39
2.41
2.45
2.47
2.51
2.53
2.55
2.59
2.61
2.65
2.67
2.71
2.75
2.77
2.81
2.83
2.87
2.91
2.93
dB EMF nM
-27.0 to 127.0
127.1
127.2
127.3
127.4
127.5
127.6
127.7
127.8
127.9
128.0
128.1
128.2
128.3
128.4
128.5
128.6
128.7
128.8
128.9
129.0
129.1
129.2
129.3