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General Information
Description
Description
The noise source produces noise output (power-on) when +28 V is
applied. When it is off, there is residual noise due to thermal agitation in
the noise source (power-off). These two noise levels are used to measure
the gain and added noise of the device under test, and consequently, its
noise figure.
The Excess Noise Ratio (ENR) for each noise source has been measured
at major frequencies and recorded on a label attached to the noise source
(see Figure 1-2). ENR references power-on to the noise power that exists
at 290 Kelvin (17 °C). In addition, a separate calibration sheet showing
the complex reflection coefficient in both the on and off states is included
with each instrument.
All three models are provided with a BNC female connector for power
input. The output connector is a male APC-3.5 on the standard noise
sources. Type-N and APC-7 connectors are available as options for the
Agilent 346A and 346B Noise Sources. In addition to these general
characteristics, certain characteristics apply to the specific models.
These characteristics are listed in Table 1-4.
Figure 1-2
A Partial View of Typical Calibration Label
10
Chapter 1
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