Atec Agilent-8901B - Manual

HP 8901B Modulation Analyzer
Options 030/037
10 MHz - 1.3 GHz
Selective Power Measurements
Technical Specifications
Adjacent Channel Power
Measurements
The HP 8901B Modulation Analyzer’s easy-to-use se-
lective power measurement option saves you time
and money, speeding adjacent-channel power testing
on your RF communications transmitters. These se-
lective measurements meet the stringent CEPT stan-
dards for adjacent-channel power with superb accu-
racy: ±0.5 dB; dynamic range >115 dB; and selectivity
>90 dB. The HP 8901B also performs RF power, fre-
quency, modulation and audio measurements, plus
selective RF power measurements, fully characteriz-
ing your transmitter in seconds.
Making an adjacent channel power measurement is
simple. You first select the appropriate filter
(12.5, 25 or 30 kHz channel spacing) and measure the
transmitter carrier power. Then, tune the analyzer to
any offset desired, and measure the channel power.
The analyzer displays the results in dBc (dB relative
to the carrier power).
To meet the CEPT noise-floor requirements at fre-
quencies greater than 300 MHz, the HP 8901B re-
quires an external local oscillator (LO) such as the
HP 8656B Synthesized Signal Generator. Selecting
an external LO with fine frequency resolution also
improves the analyzer’s tuning resolution, which can
be as coarse as 2 kHz at 1300 MHz. Using an
HP 8656B signal generator gives you 10 Hz resolution
up to 990 MHz. Dedicating a signal generator as the
external LO is not necessary. When not being used as
the LO, a built-in RF switch in the HP 8901B routes
the signal generator’s output to the rear panel of the
analyzer.
Direct-Spectrum Carrier Noise
Measurements
The HP 8901B Modulation Analyzer, with a low noise
external LO, performs fast, accurate single- sideband
(SSB) carrier noise measurements to 1.3 GHz. To
make a carrier noise (AM noise and phase noise)
measurement, you select the noise filter
(2.5 kHz noise bandwidth), measure the source un-
der test’s carrier power, tune the analyzer to the fre-
quency offset desired (5 kHz to 1300 MHz) and mea-
sure the noise. The data is displayed in real time,
either as dBc in a 1 Hz bandwidth or as total power
in the 2.5 kHz filter bandwidth.
HP-IB: Not just IEEE-488, but the hardware
documentation and support that delivers the
shortest path to a measurement system.
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