HA7000

The modified Holzworth noise analyzers are designed to perform a measurement quickly and efficiently without unnecessary trouble.

External LO mode feature
Fast measurement of quartz oscillators
Precise noise floor reduction
Acceleration of R&D and production measurements

The HA7000 is a series of Holzworth Instrumentation phase noise analyzers using real-time cross-correlation. A design based on a pair of independent, low-noise LO synthesizers and a dual-core correlation engine makes it possible to measure sources with a noise level better than the local oscillators of the measurement system itself. The distinguishing feature of the series is the External LO Mode, which shortens the measurement of the best oscillators — e.g. high-end OCXOs — from minutes or hours to just a few seconds. The fanless design limits the effect of microphonics on the measurement result.

Applications

Characterization of OCXO, TCXO, CRO, DRO and SAW oscillators
Phase noise measurements of synthesizers and signal generators in R&D
Fast production testing of high-end oscillators
Time and frequency metrology
Radar and communication systems with high spectral purity requirements

Key parameters

Parameter	Value
Model / feature	Description
HA7062C	Phase noise analyzer 10 MHz – 6 GHz (optionally above 20 GHz); operation with internal or external LOs
HA7062D	Range 10 MHz – 26 GHz (option up to 40 GHz); offsets 0.1 Hz – 100 MHz; 1U rack enclosure, fanless design
HA7402C	Cross-correlation measurement engine operating exclusively with the user’s external LOs
Measurement method	Real-time cross-correlation (10×, 100× and more correlations to lower the intrinsic noise floor)
External LO Mode	Connection of two non-coherent user sources as LOs — measurement of objects with noise better than the analyzer’s internal synthesizers

External LO Mode — measuring the best oscillators

The optimal measurement situation is one in which the system’s local oscillators have noise equal to or better than the object under test. When the tested oscillator outperforms the analyzer’s internal synthesizers, multiple correlations are required, which extends the measurement time. The External LO Mode solves this problem: the user connects two non-coherent, high-end sources (e.g. voltage-tuned reference oscillators) that take over the role of the measurement path LOs. In practice, this makes it possible to measure the phase noise of a high-end OCXO within seconds. The HA7062C offers this mode alongside operation with internal LOs, while the HA7402C works exclusively with external sources. An application note dedicated to OCXO measurements is available in the downloads section.

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