155 lines
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<strong>APAZMINO//NET</strong>
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<fort-nav><nav class="fort-nav" data-fort="nav"><a href="/">Alan Pazmino</a><a href="/principles.html">Principles</a><a href="/signals.html" class="active" aria-current="page">Signal Measurement Reference</a></nav></fort-nav>
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<a href="index.html">home</a>
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<a href="principles.html">principles</a>
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<a href="signals.html">signals</a>
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<header>
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<h1>Signal Measurement Reference</h1>
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<div class="subtitle">Instrument Calibration & Acceptance Criteria</div>
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</header>
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<section>
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<span class="section-label">REF — Bench Instruments</span>
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<h2>Instrument Suite</h2>
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<p>My bench is set up for independent verification across three measurement domains. Each instrument provides an independent path to validate the signal characteristics I care about.</p>
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<div class="ref-card">
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<h4>HP 8753E — Network Analyzer</h4>
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<p>Frequency range: 300 kHz – 40 GHz. Measures S-parameters (S11 return loss, S21 insertion loss). This is my primary tool for characterizing cable plants, connectors, and passive components.</p>
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<p>Calibration: Full SOLT (Short-Open-Load-Through) before every measurement session. Calibration verification kit (CVK) run after calibration to confirm the standard is holding.</p>
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<p>Acceptance: S11 > 15dB across operating band. S21 within channel loss budget per <a href="https://4ort.xyz/entity/signal-integrity" target="_blank">signal integrity standards (Q4503810)</a>.</p>
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</div>
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<div class="ref-card">
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<h4>Fluke DSX-5800 — Cable Certifier</h4>
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<p>Certifies copper cabling to TIA/EIA-568-C.2 and ISO/IEC 11801 Class EA / Cat 6A. Measures all channel parameters: insertion loss, NEXT, FEXT, PSNEXT, PSACR, return loss, propagation delay, skew.</p>
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<p>Acceptance: Must pass "Margin" criterion—measured values must exceed the standard's limits by a sufficient margin to account for test equipment uncertainty and cable degradation over time.</p>
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</div>
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<div class="ref-card">
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<h4>Keysight DSOX4000MS — Oscilloscope</h4>
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<p>4-channel, 400 MHz bandwidth. Used for protocol-level validation: eye diagram analysis, jitter decomposition, rise/fall time measurement. This is where I catch timing issues that a network analyzer can't see.</p>
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<p>Acceptance: Eye opening must meet BER < 10⁻¹² for the target data rate. Random jitter + deterministic jitter must fall within the receiver's tolerance budget.</p>
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</div>
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</section>
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<section>
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<span class="section-label">REF — Acceptance Criteria</span>
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<h2>Cable Plant Acceptance Standards</h2>
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<p>These are the thresholds I apply when certifying a cable plant for production use. Every run must pass all criteria before it's accepted.</p>
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<table class="principle-table">
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<thead>
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<tr><th>Parameter</th><th>Cat 6 (250 MHz)</th><th>Cat 6A (500 MHz)</th><th>Fiber OM4 (850nm)</th></tr>
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</thead>
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<tbody>
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<tr><td>Insertion Loss (max)</td><td>20.8 dB @ 100m</td><td>27.9 dB @ 100m</td><td>3.8 dB @ 100m</td></tr>
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<tr><td>Return Loss (min)</td><td>14.0 dB @ 250MHz</td><td>14.0 dB @ 500MHz</td><td>25.0 dB</td></tr>
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<tr><td>NEXT (min)</td><td>23.5 dB @ 250MHz</td><td>27.9 dB @ 500MHz</td><td>N/A</td></tr>
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<tr><td>PSNEXT (min)</td><td>20.5 dB @ 250MHz</td><td>24.9 dB @ 500MHz</td><td>N/A</td></tr>
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<tr><td>Propagation Delay (max)</td><td>496 ns/100m</td><td>496 ns/100m</td><td>4.8 ns/m</td></tr>
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<tr><td>Delay Skew (max)</td><td>45 ns</td><td>45 ns</td><td>9 ns (100m)</td></tr>
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</tbody>
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</table>
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<p>Source values derived from <a href="https://www.iso.org/standard/27001" target="_blank">ISO/IEC 11801</a> channel specifications and <a href="https://4ort.xyz/entity/signal-integrity" target="_blank">signal integrity (Q4503810)</a> reference data. These are working numbers from actual field certifications, not theoretical limits.</p>
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</section>
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<section>
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<span class="section-label">REF — Calibration Schedule</span>
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<h2>Maintenance & Calibration</h2>
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<p>Instrument accuracy decays over time. My schedule:</p>
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<table class="principle-table">
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<thead>
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<tr><th>Instrument</th><th>Frequency</th><th>Procedure</th><th>Record</th></tr>
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</thead>
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<tbody>
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<tr><td>HP 8753E</td><td>Annual (NIST-traceable lab)</td><td>Full factory recalibration with certificate</td><td>Log: /bench/cert/8753e</td></tr>
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<tr><td>Fluke DSX-5800</td><td>Semi-annual</td><td>Calibration verification + adjustment if drift > 1%</td><td>Log: /bench/cert/dsx5800</td></tr>
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<tr><td>Keysight DSOX4000MS</td><td>Annual</td><td>Internal self-cal + external verification</td><td>Log: /bench/cert/dsox4000</td></tr>
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<tr><td>All instruments</td><td>Weekly (bench check)</td><td>CVK verification against known reference standards</td><td>Log: /bench/weekly/</td></tr>
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</tbody>
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</table>
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</section>
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<section>
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<span class="section-label">REF — Signal Integrity Knowledge</span>
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<h2>Grounded References</h2>
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<fort-kg query="signal integrity" limit="3"><ul class="fort-kg" data-fort="kg" data-query="signal integrity"><li>signal integrity — electronic circuit tools and techniques that ensure electrical signals are of sufficient quality</li><li>integrity — concept of consistency of actions, values, methods, measures, principles, expectations, and outcomes</li><li>Integrity — episode of Modern Family</li></ul></fort-kg>
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<footer>
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<p>← back to <a href="index.html">home</a> · <a href="principles.html">principles</a></p>
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<p>alan-pazmino.4ort.net — signal measurement reference, maintained by Alan Pazmino</p>
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