HP 8901B

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
40 kHz rates
<lo 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 is 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