Fluke Oscilloscope Calibration Manual

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Oscilloscope Calibration Techniques

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Summary of Contents for Fluke Oscilloscope Calibration

Page 1 Teleconference: US & Canada Toll Free Dial-In Number: 1-(866) 230-5936 International Dial-In Number:+1-720-2395774 Conference Code: 1010759559 Oscilloscope Calibration Techniques...
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Page 4 Fluke’s Precision Measurement Business Unit and Jack Somppi Electrical Calibration Instruments Product Line Manager jack.somppi@fluke.com Oscilloscope Calibration Techniques...
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Page 9 Simplify oscilloscope calibration – Allow for full automation – All signals should be through single output – Make procedures available Reduce calibration times Reduce cost of ownership All functions integrated in a single unit – Allow for upgradeability – (workloadkeeps changing) Simplify calibrator support –...
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Page 12 Installed Base (% Units) >250MHz <250MHz <100MHz Cal’ Workload (% of Base) Oscilloscope Calibration Techniques...
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Page 14 V/cm AC/DC Y-Pos ALT/CHOP switch Delay Trigger Mode Line Level sec/cm X-Pos Timebase with sawtooth generator Oscilloscope Calibration Techniques...
Page 15 Memory µP CRT/Display Channel 2 Trigger control One A/D for each vertical channel Digital Sampling Scopes use fast Oscillator- sample and hold with slower A/D. Timebase - no ALT/CHOP mode - channel skew is a common test Oscilloscope Calibration Techniques...
Page 16 Digital Phosphor Acquisition Display Display Rasterizer Memory µP Oscilloscope Calibration Techniques...
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Page 18 Insure the voltage amplitude is measured & displayed properly Voltage Peak-to- Peak Voltage Applied Applied Voltage Pulse Oscilloscope Calibration Techniques...
Page 19 Number of measurements for averaging measurement function V typical frequency 1kHz analog & DSO Input coupling DC Any internal 50Ω Ω Ω Ω setting also calibrated Trigger level 50% Oscilloscope Calibration Techniques...
Page 20 Insure all measurable 100% frequencies respond properly 100% Oscilloscope Calibration Techniques...
Page 21 100% 3 dB Point 70.7% Bandwidth B BwFreq − Definition of -3dB Point: Oscilloscope Calibration Techniques...
Page 22 50Ω Ω Ω Ω termination calibrated for bandwidth using 50Ω Ω Ω Ω setting and a 50Ω Ω Ω Ω signal source. Good matching is important. High bandwidth scopes can have selectable or fixed internal 50Ω Ω Ω Ω termination Oscilloscope Calibration Techniques...
Page 23 ≅ ≅ ≅ ≅ 4.2 Divisions = 70.7% of Reference level at 50kHz Oscilloscope Calibration Techniques...
Page 24 Verify vertical channel Overshoot risetime, abberation Undershoot distortion, and additionally the maximum bandwidth Rise Time Generally: Rise Time (ns) = 350/BW(MHz Oscilloscope Calibration Techniques...
Page 25 ∆ ∆ ∆ ∆ V 100% = risetime ∆ ∆ ∆ ∆ V/V = overshoot/undershoot Oscilloscope Calibration Techniques...
Page 26 100% DSOs can display histogram to determine 0% and 100% points Distribution of values Oscilloscope Calibration Techniques...
Page 27 Scopes with selectable internal 50Ω Ω Ω Ω termination r, Display calibrated for bandwidth using 50Ω Ω Ω Ω setting and a Scope risetime depends on V/div setting. 50Ω Ω Ω Ω signal source. Good matching is important. Oscilloscope Calibration Techniques...
Page 28 Input signal reconstructed Signals Rise-Time t min: 0.8 t max: 1.6 t Sampling Points Oscilloscope Calibration Techniques...
Page 29 Some overlap in the Calibration Application but both required Cross Correlation Timing Effective Throughput Marker Bits IEEE Pulse Params Trigger Established Phase Sensitivity Traceable Sensitive Long Term 3dB BW Sampler Settle Eval Flatness Alignment Linearity VSWR Insensitive SINE EDGE Oscilloscope Calibration Techniques...
Page 30 Evaluate accuracy of the horizontal time scale Comb or triangle waveforms are usually used with analog oscilloscopes Oscilloscope Calibration Techniques...
Page 31 10 graticule line shows error: -1% Scopes with dual (delayed) timebases require calibration of both timebases and delay function Triangle waveform signals used for analog scopes. Square and pulse waveforms avoid edge sampling problems on DSOs. Oscilloscope Calibration Techniques...
Page 32 10 rising edges aligned with according graticule lines Period = 500ns; Error : 0% Oscilloscope Calibration Techniques...
Page 33 – External trigger for all functions – Built-in pulse generator with pulse width control – Video trigger in NTSC, SECAM, PAL and PAL-M formats with selectable line marker – Measure input impedance (resistance & capacitance) – Input Overload testing Oscilloscope Calibration Techniques...
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Page 40 • Time Mark Generator • DC Calibrator • AF Signal Generator • Fast Pulse Generator RF Signal Generator & Power • Meter • Multiplexers • Frequency Standard • Multimeter • Video Generator, Power Supply and more !!! Oscilloscope Calibration Techniques...
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Page 42 Multi-Product Dedicated Platforms Scope Cal Platforms BW < 1.1 GHz BW < 14 GHz >300 ps > 25 ps Oscilloscope Calibration Techniques...
Page 43 Multi-Product Platforms BW < 1.1 GHz >300 ps Oscilloscope Calibration Techniques...
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Page 49 Traceability via RF Power Measurement – High Sine Purity (> -35dBc) necessary 50Ω Ω Ω Ω 50Ω Ω Ω Ω 50Ω Ω Ω Ω 50Ω Ω Ω Ω 100Ω Ω Ω Ω GaAs Schottky Beam Lead Diode ( 0.05pF) Oscilloscope Calibration Techniques...
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Page 58 Members of the MET/SUPPORT Gold and Priority Gold CarePlan support programs receive a 20 % discount off any Fluke calibration training course Oscilloscope Calibration Techniques...
Page 59 AC/DC Calibration and Metrology – Metrology for Cal Lab Personnel (A CCT prep course) • Self-Paced Training Tools – MET/CAL-CBT7 Computer Based Training MET/CAL-CBT/PW Computer-Based Training (new in 2007) – More information: – Cal-Book: Philosophy in Practice textbook www.fluke.com/fluketraining Oscilloscope Calibration Techniques...
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