HP 8903B Audio Analyzer
HP 8903E Distortion Analyzer
20 Hz to 100 kHz
Technical Specifications
The Versatile Choice for
Audio Analysis
Features / Measurements
Audio Source
50/600 W Output Impedance
Fully Programmable
Balanced Input
Frequency Counter
Distortion
SINAD
AC Volts
DC Volts
RMS/Average/Quasi-Peak
Detection
Plug-in Filters
Distortion Level
Signal-To-Noise
Sweep
HP 8903B
HP 8903E
HP 8903B Audio Analyzer
Special function 47 switches source
OUTPUT IMPEDANCE- (50 or 600 ohms) to
provide higher output into lower impedance
loads (+17 dBm into 600 ohms in 50 ohm
position).
Audio source output level from
0.6 mV to 6 V open circuit,
20 Hz to 100 kHz.
Log SWEEP allows measurement of
frequency response and swept
distortion automatically.
LOG/LIN key allows results to be
displayed in linear or log units.
Log mode displays readings in
dBm into 600 ohms when
measuring AC level.
Special functions
control detector
response: rms,
average (rms
calibrated), and
quasi-peak responses
are available.
Plug-in filters add
measurement flexibility
to the HP 8903B and
HP 8903E. Both
instruments have two
slots which can be filled
with any combination of
six optional filters.
RATIO key permits display in dB
or percent relative to an entered
or measured value.
Analog meter for
SINAD mode provides
easier reading when
measuring noisy.
signals.
Balanced (full-differential) input
allows testing of bridged
amplifiers and other devices
with floating outputs. Maximum
input voltage is a full 300 volts,
differential or applied to either
the high or low input
Low-noise input
amplifier provides
superior analyzer
performance.
HP 8903E Distortion Analyzer
Front panel MONITOR output
provides a scaled output of
the input signal. In SINAD and
distortion modes, the
fundamental is removed.
NOTCH TUNE key allows
the user to lock the notch
filter at any measured
input frequency. This is
useful when measuring
very noisy signals in
distortion and SINAD
modes.
LOG/LIN key allows results to be
displayed in linear or log units. Log mode
displays readings in dBm into 600 ohms
when measuring ac level.
Plug-in filters add
measurement flexibility to
the HP 8903B and
HP 8903E. Both
instruments have two slots
which can be filled with any
combination of six optional
filters.
RATIO key permits display in dB
or percent relative to an entered
or measured value.
Front panel key allows selection of
rms or average (rms calibrated)
detector response. Quasi-peak
detector response available via HP-IB
programming.
HP-IB Not just IEEE-488, but the hardware, documentation and
support that delivers the shortest path to a measurement s ystem.
Low-noise input amplifier
provides superior analyzer
performance.
Balanced (full-differential) input has a
maximum input voltage of 300 volts
differentially or applied from the high
input to ground, and 30 volts applied from
the low input to ground.
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Transceiver Tests
Both the HP 8903B and HP 8903E have been optimized for receiver testing. For SINAD measurements, extra
filtering and smoothing circuits yield more accurate and repeatable results. With its built-in source, the HP 8903B
makes signal-to-noise measurements on AM receivers using similar smoothing techniques. Transmitter testing is
also easy. In conjunction with the HP 8901A , HP 8901B , or HP 8902A modulation analyzers you can measure
transmitter distortion, frequency response, and count squelch tones. The HP 8903B also provides the audio tones
to modulate the transmitter.
Audio Applications
The HP 8903B Audio Analyzer and HP 8903E Distortion Analyzer make your audio measurements fast and easy.
The analyzers automatically tune and autorange for maximum accuracy and resolution. Distortion, frequency
response, ac and dc voltage measurements are only a single keystroke away. With a built-in low distortion audio
source, the HP 8903B is ideally suited to stimulus-response applications. Microprocessor control of source and
analyzer allows the HP 8903B to perform swept measurements. For applications where a separate source is
used, the HP 8903E is an ideal lower-cost solution.
ATE Systems
HP-IB control of all measurement functions makes analyzers valuable tools for ATE applications. These analyzers
combine the power of a digital voltmeter, frequency counter, and distortion analyzer into one instrument. Since
these functions are all available at one input connector, interfacing requirements, hardware costs, and
software development time are reduced. The HP 8903B also includes a low-distortion programmable audio source.
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Versatile
The HP 8903B Audio Analyzer and HP 8903D Distortion Analyzer provide unparalleled versatility and performance
for audio measurements from 20 Hz to 100 kHz. Both instruments combine the functionality of a
high-performance distortion analyzer, frequency counter, ac voltmeter, dc voltmeter, and SINAD meter into one
compact package. In addition, the HP 8903B has a low-distortion audio source which allows it to perform
stimulus-response measurements, such as signal-to-noise ratio, automatically with no additional equipment.
Simple
For ease of use, most measurements are made with one or two keystrokes. Both analyzers automatically tune and
autorange for maximum accuracy and resolution. For quick identification of input signals, the analyzers count and
display the input frequency in all ac measurement modes. The HP 8903B can also measure distortion of one signal
while generating another frequency, because analyzer tuning and source frequency are independent.
Accurate
For accurate measurement of complex waveforms and noise, the analyzers use true-rms detection. Average (rms
calibrated) and quasi-peak detection are also available via front panel control, Accurate distortion measurements
can typically be made down to less than –90 dB (0.003%) between 20 Hz and 20 kHz. Over the same frequency
range, flatness measurements are possible to 0.05 dB (0.5%). The analyzers, precision reciprocal counters give
you fast, accurate characterizations of audio frequencies. For example, when counting a 1 kHz signal, the analyzers will be accurate within ±.14 Hz.
Audio Application
The analyzers have many features which make difficult
audio measurements easy. These include flexible data
display formats, balanced analyzer input, plug-in filters,
fully-automatic notch filter tuning, and for the
HP 8903B, convenient audio source control and swept
measurements. Complete control over display formatting gives you a choice between volts, millivolts, dBm
into 600 ohms, and watts for ac level measurements or
percent and dB for distortion measurements. Using the
ratio key, you can establish a reference in percent or dB
and directly make frequency response and 3 dB bandwidth measurements without computation.
Balanced Analyzer lnput
In the quest for higher output power, many audio amplifiers use bridged output stages. Such amplifiers can be
difficult to characterize because their outputs cannot
be grounded. To test these devices, the usual approach
has to been to use a balanced, calibrated isolation
transformer connected to an analyzer with an unbalanced input. Balanced inputs on the HP 8903B and HP
8903E make transformers unnecessary. Simply float the
analyzer input and connect the bridged device directly
and you are ready to make measurements.
Balanced analyzer inputs make testing bridged amplifiers
easy and fast
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