Tektronix VM700T инструкция обслуживания

VM700 T (turbo) V ideo Measurement Set Option 11 P AL V ideo Measurements M any capabilities in one instrument – Digitizing waveform monitor – Digitizing vectorscope – Picture Display – Group delay and frequency response – Noise measurement set – Automatic measurement set Auto mode – Unattended monitoring of P AL video signals from st[...]

modem to report measurement r esults or control a signal router . A relative to reference mode allows normalizing to a signal source or eliminate signal path errors from the desired measurement. Up to 2 video references can be stored in NVRAM. Additionally , a f te r downloading to a PC through the V M700T FTP driver , the video reference can be up[...]

Vertical interval test signals can be seen very clearly for additional analysis of the signal. These can be printed as support documentation for automatic measurement results. E ven a single horizontal synchronization pulse can be displayed at a high intensity . 0.5 0.0 Volts Sound-In-Sync Off Sound-In-Sync Off Precision Mode On Precision Mode On L[...]

Bar Line Time measurement. Chrominance to Luminance Gain and Delay measurement. MEASURE MODE 1,2 BAR LINE TIME A bsolute Relative M easurement Range Mode Mode Accuracy Accuracy B ar Level (b1 or Back Porch) 300 mV to 1.4 V ± 0.5% ± 0.2% S ync Level 50 mV to 600 mV ± 0.5% ± 0.2% S ync to Bar T op 350 mV to 2 V ± 0.5% ± 0.2% S ync/Bar Ratio 10%[...]

Chrominance Non-Linearity measurement. Color Bar measurement. Luminance Level (mV ) Luminance Level (mV ) Chrominance Level (mV ) Chrominance Level (mV ) Chrominance Phase (deg) Chrominance Phase (deg) Gray Gray Yellow Yellow Cyan Cyan Green Green Magenta Magenta Red Red Blue Blue Black Black 0.0 500.0 1000.0 0.0 500.0 1000.0 0.0 500.0 1000.0 0.0 5[...]

Frequency Response and Group Delay measurement using Sin X/X. Horizontal Timing measurement. M EASURE MODE (continued) FREQUENCY RESPONSE AND GROUP DELA Y A bsolute Relative M easurement Range Mode Mode A ccuracy Accuracy F requency Response to 5 MHz ± 40 dB ± 1.0 dB ± 0.3 dB to 6 MHz ± 40 dB ± 2.0 dB ± 0.6 dB Group Delay to 5 MHz ± 1.0 µs [...]

LINE FREQUENCY M easurement Range Accuracy L ine Frequency ± 3% ± 0.1% F ield Frequency ± 3% ± 0.1% LUMINANCE NON-LINEARITY Absolute Relative M easurement Range Mode Mode A ccuracy Accuracy L uminance Non-Linearity 0 to 100% ± 0.4% ± 0.2% K-factor measurement. Luminance Non-Linearity measurement. Luminance Non Linearity (%) Luminance Non Line[...]

VERTICAL BLANKING M easurement Range Absolute Mode Accuracy E qualizing Pulse Width 80 ns to 1 µs ± 10 ns B road Pulse Width 80 ns to 1 µs ± 10 ns V ertical Blanking Field 1 19 to 30 lines NA Vertical Blanking Field 2 19 to 30 lines NA Noise Spectrum measurement. V e rtical Blanking display . M EASURE MODE (continued) NOISE SPECTRUM M easuremen[...]

AMPLITUDE AND PHASE MEASUREMENTS (continued) M easurement Range Accuracy ITS Element Standard D ifferential Gain 0 to +100% ± 0.3% D2 CCIR Rec. 569 ( Peak and p-p) (0% nominal) D ifferential Phase 0 to 360 deg ± 0.3 deg D2 CCIR Rec. 569 (Peak and p-p) (0 deg nominal) FREQUENCY RESPONSE MEASUREMENTS M easurement Range Accuracy ITS Element Standard[...]

Unified Unweighted filter response curve per CCIR Recommendation 567. 0 –5 5 08 M Hz d BV –5 – 10 – 15 –2 0 –2 5 –3 0 –3 5 –4 0 – 45 –5 0 1 234 5 67 U nified Luminance weighted filter response curve per CCIR Recommendation 567. 0 – 14 05 MHz dBV .5 1 1.5 2 3 4 –12 – 10 –8 – 6 –4 – 2 2.5 3.5 4.5 Chrominance Weight[...]

Measur ement r esults are displayed in an easy-to-read format indicating the time, signal source, measurement, and whether the measured value exceeded caution (*) or alarm (**) limits. 11 VM700T Video Measurement Set C hannel A System Def ault 07-A ug-96 19:06:58 VM700T Video Measurement Set System Default Violated Limits Lower Upper Source ID ----[...]

Measurement methods The following paragraphs specify the methods for each Option 11 measurement. Where appropriate, reference is made to the relevant CCIR recommendation. Line blanking timing measurements Color Burst Duration: Measured between the half-amplitude points of the burst chrominance envelope. Result expressed as the number of cycles betw[...]

Other timing measurements B ar Rise T ime: M easured between the 10% and 90% points on the leading edge of bar . See element B2. A mplitude and phase measurements Sync Amplitude Error: Measured as the difference b etween the sampled sync pulse amplitude and a nominal 300 mV amplitude. Result expressed as a % of the nominal 3 00 mV . Sign is positiv[...]

C/L Gain Inequality: Measured as the difference between the sampled peak-to-peak ampli- tude of the 700 mV (nominal) chrominance packet (G1 or G2) and the sampled amplitude of the luminance bar (also nomi- nally 700 mV). Result expressed as a % of sampled bar amplitude. Sign is positive if the chromi- nance amplitude is greater than the luminance a[...]

Frequency response measurements M ultiburst Flag Amplitude: Measured from the center point of the flag top to the ensuing bottom of the flag. Result e xpressed as % of sampled bar a mplitude. See element C1 and CCIR Recommendation 567. M ultiburst Amplitude (five packets): Measured as the peak-to-peak amplitude of each of the first five multiburst [...]

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