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Category Archives: Test Sector
Bandwidth and Rise/Fall Time concerns
To be able to have a certain rise/fall time (10/90) perecent measurement a minimum bandwidth must be meet. The general rules: T(second)=0.35/BW(Hz) T=Rise / Fall Time BW=Bandwidth BW T MHz ns 10 35.000 20 17.500 30 11.667 40 8.750 50 … Continue reading
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Design Team effort will give you a leg up on your project.
Many time when you are assign a task in test equipment as the Test Engineer while the Design Team is working on the product that you will need to automate. This is a great time to find out what instruments they are using and which … Continue reading
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RF Attenuator – Protect DUT and Measuring Device
RF Attenuator reduce RF power. One purpose is to protect both the DUT and Measuring Device from exceeding input power max. Exceeding input power can damage expensive DUT and Measuring Device (ex Spectrum Analyzer). RF Attenuator come as Fixed,Manual (steps), … Continue reading
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Spectrum Analyzer — RBW and VBW settings
The effects of changing Resolution Bandwidth (RBW) and Video Bandwidth (VBW) setting on a spectrum analyzer. Small frequencies for RBW setting will lower noise floor. Small frequencies for VBW setting will lower noise amplitude. Small frequencies for RBW and VBW … Continue reading
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Optical Transceiver Testing
These are some of the instruments required for testing an Optical Transceiver. Instruments DCA (for eye diagram, mask Test, Jitter) Bert[Bit Error Rate tester] for testing Data Bit Error Rates vs time and Random Data Pattern Source, Clock Source. Optical … Continue reading
Hardware IO list important step for Software Programmer
Before a software can implement assignment for AD ,DA , DIO, DMM, Function Generator, etc. you need to know the Hardware IO List. assignment The Hardware Engineer(which may also be the Software Engineer) most likely will have created this list to … Continue reading
Load Resistor and Current Sensing Resistor wiring.
Load Resistor wiring must be must be in a correct order to maintain the best accuracy for monitoring the voltage across the Load Resistor. Sensing wires which are used to monitor the voltage across the resistor should be as close … Continue reading
Test Report – Typical Format
Below is a typical format used in test report. This can be txt or html. LabVIEW has report gen tools. Some Test reports can also in images (ex Scope captures images) If you are using TestStand to create the Test … Continue reading
Signal Quality with DCA , Eye Diagram, and Mask
One of the methods used for checking signal quality is overlapping DATA signal with respect to a clock (clk). Persistence must be ON for the overlapping of the DATA signal. Jitter is the variation of the timing in the signal relative to the trigger (clk) Jitter has many components … Continue reading
Rack Panel Power/Motor wiring
You did a great job of putting your high Power pins AWAY from your small signal (analog and digital). Also: Document on the schematic/assembly drawing where and what type wiring to use. Tell the technican/assembler to keep certain wires harnessed away from the … Continue reading
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