Phasemetrics DFHT Dynamic Flying Height Tester

Phasemetrics DFHT Dynamic Flying Height Tester
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Phasemetrics DFHT
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Microscope Specifications:

Objective Lenses -  10 x (N.A. 0.25) and 20 x (N.A. 0.35)

Working Distance - > 0.5 inch

 

Resolution -
  • 60 microinches ( 20x objective)
  • 80 microinches ( 10x objective)

 

Depth of Focus -
  • 40 microinches ( 20x objective)
  • 80 microinches ( 10x objective)
 

Glass Disk Specifications:

Diameter - 3.740 inches

Thickness - 0.100 inches


Microscope Translation Stages Specs:

Motion - X-Y motion

Range - 2 x 2 inches

Resolution - 5 microinch step size

Dynamic Flying Height Tester
  • Capable of measuring head/media spacings of zero (contact) to 40 microinches.
  • Capable of taking up to 2,000 spacing measurements per revolution at 7200 RPM ( a sampling frequency of 240 kHz).
  • Detect airbearing resonant frequencies of up to 100 kHz.

 

Measurement Specifications:

Measurement Range - less than 1 microinch to 40 microinches

Data Acquisition Time - 3 microseconds

Sampling Rate - up to 2000 measurements per revolution at 7200 RPM (240 kHz sampling rate)

Single Point Test Time - less than 1 second

Measurement Spot Size -

  • .001 inch diameter (with 20x lens)
  • .002 inch diameter (with 10x lens)

Throughput - greater than 60 heads per hour

 

Spindle Drive Specifications:

Rotational Speed Range -  50 RPM to 7200 RPM (bi-directional)

Rotational Speed Stability - +/- 0.1% (for speeds > than 100 RPM)

 

Spindle Translation Stage Specifications:

Motion - X-Y Motion

Range - 4 x 6 inches

Resolution - 10 microinch step size