Sub-Harmonic Noise Ratio (Shnr) - Agilent Technologies E5022A Operation Manual

Sub-Harmonic Noise Ratio (SHNR)

Overview This section describes the SHNR measurement. This test is used to detect baseline popping
of MR/GMR heads by measuring the sub-harmonics noise ratio.
Measurement
1. To open the SHNR menu, click on the [SHNR] button from the Parameter Sweep frame
Procedure
of the Measure menu.
Figure 3-95 SHNR Menu
NOTE
Before you execute this measurement, you should set an appropriate input range or execute
the Auto Configuration to set the input range automatically.
2. Set the parameters, click on each button to enter a new value.
Channel Bit Rate
Write Current
Data Pattern
Center Freq.
Average
Chapter 3
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VEE Measurement Program Operation
Specifies the speed at which data bits are
written on the media in bits per second [bps].
Specifies the current applied to the write head.
Specifies the data pattern to be written on the
test track. To set the data pattern, click on the
[Configuration] > [Setup] > [Pattern Config]
buttons to open the data pattern menu.
Specifies the measurement frequency of the
spectrum analyzer.
Specifies the number of revolutions to get the
average results.
Measurement
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