Hello,
We currently run shock and vibration testing to specific standards on electrical connectors (Dsub, Rectangular, Circular). Our requirement is that we send 5volts @ 100ma and monitor for discontinuity lasting 1microsecond or longer. We use a keithley 2231A-30-3 and Tektronics DPO2002B. They are both plugged in to an isolation transformer (recommended previously). We have since switched buildings and are experiencing noise on our accelerometers (resolved low noise cable) and oscilloscopes (unresolved). Really trying to get a consultant in to evaluate everything but I can only do so what I am allowed.
In the same room running the Amplifier PAS106 when the system powers on there is no noticeable noise being picked up. When the gain on the amplifier is turned up the waveforms pickup by several magnitudes on the oscilloscopes.
The two main things I am really needing help with are:
1) It has been suggested that we switch to a shielded twisted pair wire for our electrical hookups. If we chose this option I am unsure of a few things. Would it be best to ground the shield on one side and leave it open or connect both sides? With the isolation transformer in play would grounding to the chassis of the power supply even work? Would it be smarter to not float the d/c power supply and ground the shield to the chassis?
2) Is there any one piece of equipment that would meet our requirements? Be able to send 5VDC @ 100ma and monitor for Discontinuity for 1microsecond or longer? I currently have the most experience on this system and am leaving at the end of the month. I would like to get the process as pain free as possible and if I could avoid teaching everyone our current setup would be ideal.
Thank you for any assistance or advice you can provide. I have spent countless hours(days total) searching this subject and am unable to find a for sure answer. Everything from ground the shield on one side to both sides to not at all.
We currently run shock and vibration testing to specific standards on electrical connectors (Dsub, Rectangular, Circular). Our requirement is that we send 5volts @ 100ma and monitor for discontinuity lasting 1microsecond or longer. We use a keithley 2231A-30-3 and Tektronics DPO2002B. They are both plugged in to an isolation transformer (recommended previously). We have since switched buildings and are experiencing noise on our accelerometers (resolved low noise cable) and oscilloscopes (unresolved). Really trying to get a consultant in to evaluate everything but I can only do so what I am allowed.
In the same room running the Amplifier PAS106 when the system powers on there is no noticeable noise being picked up. When the gain on the amplifier is turned up the waveforms pickup by several magnitudes on the oscilloscopes.
The two main things I am really needing help with are:
1) It has been suggested that we switch to a shielded twisted pair wire for our electrical hookups. If we chose this option I am unsure of a few things. Would it be best to ground the shield on one side and leave it open or connect both sides? With the isolation transformer in play would grounding to the chassis of the power supply even work? Would it be smarter to not float the d/c power supply and ground the shield to the chassis?
2) Is there any one piece of equipment that would meet our requirements? Be able to send 5VDC @ 100ma and monitor for Discontinuity for 1microsecond or longer? I currently have the most experience on this system and am leaving at the end of the month. I would like to get the process as pain free as possible and if I could avoid teaching everyone our current setup would be ideal.
Thank you for any assistance or advice you can provide. I have spent countless hours(days total) searching this subject and am unable to find a for sure answer. Everything from ground the shield on one side to both sides to not at all.