HP 8901B Operation And Calibration Manual page 358

Performance Tests Model 8901B
Performance Test 4
AUDIO FILTERS TEST
Specification
Characteristic
AUDIO FILTERS
50 Hz
High-Pa
(2
Pole)
3 dB Cutoff Frequency
Flatness
3 dB Cutoff Frequency
Flatness
3 dB Cutoff Frequency
Flatness
3
dB Cutoff Frequency
Flatness
Flatness
i
300 Hz
High-Pa
(2
Pole)
3
kHz
Low-Pa
(5
Pole)
15 kHz
Low-Pa
(5
Pole)
>20 kHz Low-Pa (9
Pole Bessel)(')
Performance
Limits
50 Hz
nominal
<1%
300 Hz
nominal
<1%
3 kHz
nominal
<1%
15 kHz
nominal
<
1
O / o
<
1%
~~
Ir minimum overshoot
sa
Conditions
>200 Hz rates
>1
kHz
rates
<1
kHz
rates
4 0 kHz
rates
< l o
kHz
rates
(l)
The >20
kHz
low-pass filter is intended
wewave modulation.
Description
A signal is frequency modulated by a source which
is known to have FM which is
flat with rate. The
flatness of the demodulated signal is then measured for various modulation filters.
NOTE
Flatness
of
the audio synthesizer i s critical for this test. If the audio
synthesizer
has
leveling capability, switch it on.
Equipment
AM/FM Test Source
.............................................................
H P 11715A
Audio Synthesizer.
................................................................
HP 3336C
Procedure
NOTE
In the following procedure the RF modulation source can be connected
either to a sensor module (which is connected to the Modulation Analyzer)
or
directly to the Modulation Analyzer's
INPUT
connector. The procedure
is written for the latter case.
4-18 Performance Test 4