HP 8901B - Page 80

1-1 6 Audio Analyzer
-~
Audio Max. External
Frequency Input Voltage
20 Hz to 250 kHz
(usable to 600 kHz)
3 Vrms
Audio Frequency
Measurement Ranges
That’s all it takes to measure intemally-demodulated or external audio
frequencies throughout the
following ranges:
Audio Max. External
Frequency Input Voltage
400 Hz and 1 kHz 3 Vrms
Measuring
Audio Distortion
Display
Range
0.01% (-80.0 dB) to
100.Oo/o (0.00 dB)
Use the HP 8901B to measure distortion on either a 400 Hz or a 1 kHz
signal. Distortion measurements can be made on either the internally
demodulated signal or on an external audio signal connected to the
AUDIO INPUT port.
should remain lit). The instrument is now displaying the measured
distortion
of the 1 kHz demodulated signal. Notice that in the display,
the
1 kHz annunciator is lit. The true-RMS detector is used to make
this measurement.
2. Press the Blue Shift key and the 400 Hz DISTN (PEAK-) key (the 400 Hz
annunciator should be lit in the display). The instrument is now ready
to measure the distortion level
of a 400 Hz signal.
1. Press the gold S key and the AUDIO DISTN (FM) key (both keys
Audio Distortion
That’s all it takes to measure audio distortion throughout the following
Measurement Ranges measurement ranges:
I I
I I
Measuring Audio Level
The HP 8901B is able to measure the rms voltage level of external
audio signals applied directly to the AUDIO INPUT
port. (Audio level
measurements cannot
be made on internally demodulated signals.)
1. When you need to measure audio level, connect an audio source
to the AUDIO INPUT port.