Model
8642A/B
Description
Procedures
Operation
MODULA
TION,
AM
The
Signal
Generator
can
amplitude
modulate its
RF
output
either
with
a
variable
internal
modulation
oscillator
and/or
with
an
ac-
or
dc-coupled
external
source
applied
to
the
AM/PULSE
INPUT.
When
amplitude
settings exceed +14.0 dBm
(l.12V,
121.0 dBuV, 2.25 EMF
V,
and
127.0
dB
EMF
uV),
the
AM
depth
setting
is
limited. (Refer
to
Table 3
-18
on page
3-102.)
Table
3-17.
AM
Operating
Characteristics
Electrical
Performance
Limits
Conditions
Characteristics
AM
Depth
0%
to
99.9%
Output Amplitude
~+10
dBrn
1
(707 mV, 1.41 EMF
V,
117.0 dBI'V,
123
dB
EMF
IN)
Resolution 0.1%
AM
Indicator
Accuracy
:!:(3.5%
of
setting
1·1%
AM) 8642A
bands
3
1-8, HET;
(1
kHz rate,
up
to
90% AM)
8642B
bands
1-9, HET
:!:(5%
of
setting ± 1% AM)
8642A bandS
9,
8642B band 10
AM
Distortion at 1 kHz rate 8642A
Bands
1-8;
8642B
Bands
1-9
<1%
0%
to
30% AM
<2%
30%
to
70%
AM
<4%
70%
to
90%
AM
8642A Band
9,
HET;
8642B Band 10, HET
<2%
0%
to
30% AM
<4%
30%
to
70%
AM
<6%
70% to
90%
AM
AM
3
dB
BandWidth
de
to
100 kHz
External dc, bands
2
1. 5
thru
10
(Depttl
~90%)
20 Hz
to
100 kHz External
ac
and internal,
bands
3
1. 5 thru 10
de to 20 kHz
External dc, bands
2
•
s
2,
3,
4
20 Hz
to
20 kHz External ac and internal,
bands
2
.
3
2. 3, 4
Incidental
<PM
<0.2
radians peak
(1
kHz rate and
30%
AM)
1lt
is possible
to
set AM with an
output
amplitude above this limit However, its modulation characteristics are
root
specified
2Specific band information
is
available in Table 3-11
SAM
bandwidths
up
to
100 kHz can be obtained by selecting Special Func:ion 8 (Prefer Heterodyne Sand)
Note:
Put
the
instrument
in
its
initialized
state
by
selecting (
INSTR
PRESm.
AM
can
be
configured
to
use
either
the Signal
Generator's
internal
modulation
oscilla tor,
an
external
source,
or
combinations
of
the
two
sources.
3-97
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