HP 8901B Operation And Calibration Manual page 354

Performance
Tests Model 8901B
Performance Test
3
Q M
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 f l digit
f3%
of reading
f l
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
l o
0"
4.0
2
2.0
c
1 . 0
n
m
.4
p"
.2
0
>
.-
.-
m
Y
.1
100
200
/
400
l k
2 k
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