Performance
Tests
Model
8901B
Performance
Test
3
QM
TESTS
Specification
Characteristic
PHASE MODULATION
Rates
Accuracy('
12)
Demodulated Output
Distortion
Performance
Limits
200
Hz to
10
kHz
200
Hz to
20
kHz
f4%
of reading
fl
digit
f3%
of reading
fl
digit
<0.1%
THD
~~ ~~
Conditions
150
kHz to
10
MHz carrier
10
to
1300
MHz carrier
150
kHz to
10
MHz carrier
10
to
1300
MHz carrier
150 kHzlf,<lO MHz
0.1
Radian
v)
5
100
.-
n
5
40
E.
r
20
lo
0"
4.0
2
2.0
c
1.0
n
m
.4
p"
.2
0
>
.-
.-
m
Y
.1
100
200
/
400
lk
2k
4k
10k
20k
rms
detector
only
Modulation
Rate
(Hz)
O.OOO1
Radian
Resolution
Phase Modulation Deviation and
Maximum
Resolution
~~~
(l)
Peak residuals must be accounted for in peak readings. (Refer to
Residual Noise Effects
in
Detailed
Operating lnstructions
in Section
3.)
(2)
For
rms detector, add
f3%
of reading.
Description
A
signal with a known amount of phase modulation
is
generated
by
frequency modulating a carrier
at a
known
peak deviation
(as
measured by the previously-calibrated Modulation Analyz'er) and rate.
The relationship between the peak phase deviation and peak frequency deviation
is:
peak frequency deviation
peak phase deviation
=
modulation
rate
.
The measured deviation is compared with the calculated deviation for several combinations of FM
deviation and rate. The distortion
is
also
measured.
A
special
AM/FM
test
source
is
required for these
tests to assure that the FM source has adequate bandwidth, low-distortion, and low residual FM.
4-14
Performance Test
3
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