Chapter 3
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VEE Measurement Program Operation
Measurement
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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
Procedure
1. To open the SHNR menu, click on the [SHNR] button from the Parameter Sweep frame
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
Specifies the speed at which data bits are
written on the media in bits per second [bps].
Write Current
Specifies the current applied to the write head.
Data Pattern
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.
Center Freq.
Specifies the measurement frequency of the
spectrum analyzer.
Average
Specifies the number of revolutions to get the
average results.
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