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  • PWM Frequency for DC Motor Control | Eng-Tips
    As a practical matter, 15 to 20 kHz is the usual switching frequency for motor drives This is so that audable noise is not a problem The ripple current will also be low for common values of motor inductances (current ripple increases the motor heating)
  • Plastic material which is permeable for IR (infra red) signals
    seems that you are confusing IR with ultrasonic when you talk about 30 to 56 kHz IR is in the THz range and ultrasonic is above about 20 kHz
  • how to interface a differential op-amp to a single ended output
    I would like to have a regular op-amp (single ended) input driven via differential outputs from a differential op-amp I assume this will be better than going to a single ended configuration right after the diff op-amp (typical configuration) The question is how to best interface the ad8137 in
  • Vibration conversion | Eng-Tips
    Most manufacturers provide a certificate of calibration from 0-10 KHz, etc for accelerometers as well as comparison to a NIST reference accelerometer
  • Harmonics in Grid - How to measure | Eng-Tips
    It depends how high of frequencies you want to measure accurately For CTs, they're generally pretty good up to 25th to 32nd harmonic For VTs, oil-filled VTs are normally decent up to about 1 kHz
  • Required contact area for electrical connection - Eng-Tips
    Looking for some sparky knowledge here I'm designing some test equipment and need to make sure I have enough contact area to prevent heating a threaded connection beyond the point where it can be reused We will be running 1000V and 1000A through the connection The real trick is the duration
  • Meausing voltage across a shunt resistor with an oscilloscope
    Hi, I am trying to measure the voltage across a shunt resistor with an oscilloscope (actually, one of Yokogawa's 'ScopeCorders') Since a DC current flows through this resistor in two directions, neither end is at ground potential Can this voltage be measured with a single voltage probe
  • Uncontrollable Shaker Table Resonance | Eng-Tips
    Hello, I am trying to conduct random vibration testing using a electrodynamic shaker table In testing there is a resonance (~1975 Hz), caused by the shaker assembly itself, within the the desired spectrum (10-2000 Hz) This resonance cannot be controlled and is preventing our response PSD from
  • full-bridge PFC | Eng-Tips
    The above shown full-bridge PFC could also be switched at 10's of KHz and use IGBT's which are more robust than MOSFETS, and can handle higher voltage spikes, and should last longer in off line applications
  • High Power High Frequency Supply | Eng-Tips
    Low-frequency power transmitters are used for special heating applications, and even the (obsolete and dismantled) Loran system used high-power tube transmitters at around 88 kHz





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