
What is the HP 3048A Used For ?
The HP 3048A is designed to reduce the difficulty of making accurate
phase noise measurements. The HP 3048A allows you to make phase
noise measurements using a phase detector in a phase lock loop con-
figuration, a phase detector without a phase lock loop, or with an FM
discriminator.
Each method allows the measurement results to be plotted as phase noise
{£(/) or S$(f)), or frequency noise (S
y
(f) or S
v
(f)) over an offset range
of 1 mHz to 100 kHz (or to 40 MHz with a supported RF Analyzer).
Using an external crystal detector, the HP 3048A system can automat-
ically quantify the level of AM noise that could affect a phase noise
measurement.
The HP 3048A allows you to measure and plot the results of Noise Voltage
measurements.
A real-time measurement mode (Noise Monitor) is available for monitor-
ing single frequency points, or changes in the level of phase noise and
discrete spurs as changes are made to the device-under-test.
The system also allows you to plot measured data (Computed Outputs) as:
• Integrated Noise,
• Sigma vs Tau (Allan Variance),
• Various Normalized Bandwidths,
• 2 or 3 Oscillator Comparisons,
• Spur Listings.
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