二手示波器|TDS794D|Tektronix|数字示波器|泰克|2GHz|10GS/s|四通道
Full-bandwidth HDTV signalsareprimarilyfound within the TV studio, running between HDTVcameras,VTRs,switchers, and conversion products. These componentvideosignals areusually transmitted as serial digital signals oncoaxor fiber-opticcable. The characteristics of these serialsignalsare specified bySMPTE 292M.
This application note describes how to use aDigitalPhosphorOscilloscope (DPO) to perform physical layer testingof a1.485Gb/s serial digital HDTV signal. The TDS794D was chosenforthisapplication because of its 2 GHz analog bandwidth and250GS/sequivalent-time sample rate. The CommunicationSignalAnalyzeroption is also used (for mask testing). Themeasurementsdiscussedhighlight some of the oscilloscope'scapabilities fordesigndebugging, signal characterization, andverification ofcompliancewith industry standards.
Tektronix TDS794D Oscilloscope, Digital: 2GHz,4GSa/s,4ch (Stand alone)
The Tektronix TDS794D oscilloscope is a graph-displaying device – it draws a graph of an electrical signal. In most applications, the graph shows how signals change over time: the vertical (Y) axis represents voltage and the horizontal (X) axis represents time. The intensity or brightness of the display is sometimes called the Z axis.
The Tektronix TDS794D oscilloscope's simple graph can tell you many things about a signal, such as: the time and voltage values of a signal, the frequency of an oscillating signal, the “moving parts” of a circuit represented by the signal, the frequency with which a particular portion of the signal is occurring relative to, other portions, whether or not a malfunctioning component is distorting the signal, how much of a signal is direct current (DC) or alternating current (AC) and how much of the signal is noise and whether the noise is changing with time.
Performance Characteristics of the TDS794D
| Form Factor | Benchtop |
| Bandwidth | 2 GHz |
| Number of Channels | 4 ch |
| Simultaneous Channels | 4 ch |
| Simultaneous Maximum Sampling Rate/ch | 2 GSa/s |
| One ch. only max. sampling rate | 4 GSa/s |
| Max. Single Shot bandwidth | 2 GHz |
| Max. Record Length | 50000 pt/sec |
| Min. Vertical Sensitivity | 10 mV/div |
| Maximum Vertical Sensitivity | 1 V/div |
| Rise time | 175 ps |
| Number of Bits | 8 bits |
| Input Impedance | 50 Ohm |
| Input Coupling | DC,GND |
| Maximum Input Voltage | 5 Vrms |
| Main time base - lowest | 200 ps/div |
| Main time base - highest | 10 s/div |
| Timebase accuracy | 0.0025 % |
| Trigger Source | External,Internal |
| Trigger Modes | Auto,Edge,Logic,Normal,Pulse,Single |
| Minimum Trigger Holdoff | 16 ns |
| Minimum Glitch Trigger | 1 ns |
| Display Type | Color LCD |
| Display Size | 17.78 cm |
| Display modes | Dot,Persistence,Vector |
Programmability/Connectivity of the TDS794D
| User Interface | Proprietary |
| Ports to Peripheral Devices | Centronics,GPIB,RS232 |
| Test Pattern Storage | 10 Patterns |
| Novram data storage | Yes |
| Data Storage Type | FDD |
| Programming Language | Windows |
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