Read-Write Analyzers-2550 – Obsolete

800Mbit/s PRML Channel Analyzer 550MHz Analog Bandwidth Dual Peak Detector Servo Mode (with Guzik spin stands)

  • Significantly increased throughput
  • PRML chip integration with data rates 800Mbit/s
  • Fast PRML channel optimization
  • 800 Mflux/s programmable Pattern Generator
  • Bit precompensation with 5 ps resolution
  • 400 MHz bandwidth Spectrum Analyzer
  • Supports UP7/UI7 SP
  • Supports TSA-Compatible Cartridges
  • Supports Guzik Head Amplifiers
  • Optional Differentiates

The Guzik RWA-2550++ Revision A Read/Write Analyzer provides a wide range of parametric and PRML measurements (refer to WITE32 brochure). Dual peak detector improves accuracy of sector amplitude stability tests. PRML tests are formed with integrated PRML chips. Write and read parameters of any PRML chip can be optimized in a few seconds to achieve lower error rates. All tests are implemented under WITE32 software, suitable for both engineering and production applications. Software is run on a Pentium-based PC under Windows 95 or Windows 98.

Maximum Data Rates

  • PRML: 800 Mbit/s
  • Error rate analyzer: 800 Mbit/s (limited by PRML chip capability)


PRML Chip Integration

Plug-in chip adapter module

Data rate: 800M bit/s (PRML chip limited)

PRML chips: from Cirrus Logic, DataPath, GEC Plessey, IBM, Lucent Technology, Marvell, NEC, SSI, and others.

New PRML chips integrated on request.


  • Based on channel quality monitor
  • Based on error rate measurements
  • Customized optimization algorithms

Wide range PRML Tests including

  • Bit error rate measurements
  • Off-track channel performance


Analog Channel 971++ A

Bandwidth: 0.1 to 500 MHz at – 3 dB

Flatness: 0.3 to 400 MHz ± 0.2 dB

Group delay: flatness 200 ps, up to 400 MHz

Programmable attenuator: 36 dB in 2 dB steps

Typical non-linear distortion: better than 1% (400 MHz, output level 300mV p/p single-ended)


    • 4 low pass or programmable filters (custom cutoff frequencies for low pass filters up to 400 MHz)
    • high/band pass filters available for popcorn noise measurement


Built-in Spectrum Analyzer

Supports frequency domain tests

  • Overwrite
  • Spectrum analysis
  • NLTS measurements
  • Signal to noise ratio (including transitional noise)
  • Partial erasure
  • Frequency range: from 0.5 to 400 MHz
  • Frequency resolution: 10 Hz
  • Accuracy: ±0.2 dB within 70 dB dynamic range
  • Selectivity: Switchable – 100 kHz at -3 dB; 500 kHz at -60 dB 140 kHz at -3 dB, 850 kHz at -60 dB
  • Video bandwidth: 100 kHz
  • Noise floor level: better than – 80 dB


Guzik MR Head Amplifier

(refer to separate brochure for detailed specification)

  • Write data speed: more than 1Gflux/s
  • Rise/fall time of write current: < 800 ps
  • Write current: programmable 0 to 80 mA
  • Write to read recovery time: < 1.0 µs (typ.)
  • Differential voltage sense amplifier
  • Bandwidth: >400 MHz
  • MR Bias current: programmable -8 to 8 mA (+/-12 optional)


Head Amplifiers

  • More than 100 types available
  • Amplifiers with separate read and write chips
  • Parallel/serial control of head amplifier chip
  • TSA & CAM style cartridge designs
  • Available in variety of wire and TSA terminations.
  • Write current: programmable 0 to 80 mA in 0.02 mA steps.
  • MR read bias: programmable up to ± 20 mA (the range of the bias current depends upon the type of head amplifier) in 0.01mA steps or serial control of bias current.


Write Channel

  • Frequency Synthesizer: up to 2 GHz with better than 1 Hz resolution
  • Frequency stability: ± 2.5 ppm up to 75° C,
    ± 1 ppm/year
  • Pattern generator: Higher than 800 Mflux/s, programmable pattern up to a maximum of 32 Kbytes of encoded data and hierarchical pattern structure
  • Pre-compensation: three precompensation values with a 5 ps resolution can be assigned to any bit in a pattern, or an unlimited number of precompensation values at 20 ps resolution can be assigned to any bit in a pattern
  • Jitter: 10 ps RMS (typical) for a random pattern



RWA-2550++ Revision A:

  • Size: 21.6″ x 17.6″ x 7.3″
  • Weight: 35 lbs.
  • Power: 100-240 VAC (±10%, 50/60 Hz)

ANA-971 Revision A:

  • Size: 19.0″ x 17.6″ x 3.3″
  • Weight: 14 lbs