Vibration Measurement with Trig-tek Reader 203G8

Well, I'm not sure what you mean by "reader", but I just looked up the Trig-Tek 203G8 and it appears to be a standard charge amplifier. I noted that it has two types of inputs -- one in mV/g and one in pC/g. Using the correct mode for the accelerometer in question is vital. I also see that there are two levels of integration; each one has a low-pass function that rolls off at 6 dB/octave, yielding, with one integration, velocity, and, with two, displacement outputs from an acceleration input. These integrating circuits can be switched in and out at will, dependeing upon what type of data you need. There are also controls to set the accelerometer sensitivity and output levels. Most likely you will find that you can have output levels of 10 mV/g and 100 mV/g.

I would like to see the entire signal path; I could quickly find the trouble then. I hope that this is enough information to get you going; if not, feel free to contact me at ed_watts@verizon.net, and I will help as much as I can. Good luck.

Thank you very much for your attention.

Actually, after two days checking all the settings and making sure my probe was OK and the charge amplifier adjusted to it, during one removal of one amplifier from its rack, I noted that one selector switch that selects speed or acceleration input, was a little bit out of place. I cycled the switch, positioned again in acceleration, turned all on again, and the two amplifiers worked very well, for the first time.

This is one of those things that are never resolved in a friday afternoon, but are always easily and quickly solved in the monday morning, making you feel a stupid.

(Murphy's laws...)

Hi. I am a new member. It is a pleasure for my to great them to all.

I have a question, I need to know what is the Part Number of the connector that have intalled the Charge Ampiflier Trig-Tek model 208.

I need to know it to connect an Accelerometer Bruel & Kjaer 4382.

Thanks and Best Regards.

Guillermo.

Hi. Welcome there.

Well, I dont know whats your accelerator model, if it comes with cabling or not. But, in my case, I have some of this accelerators (actually three) and they came along with coaxial cables with miniature threaded connectors that just fit the accelerometer body connector. The other point of the cable has the same connector, but we were able to find, from another Bruel & Kjaer set, three connectors that have threaded miniature connectors in one side, and standard BNC bayonet type connectors in the other. So, from there point on until the amplifier, we use standard size bayonet type BNC connectors and coaxial cables.

The Trig-tek amplifier itself needs to be installed in a proprietary Trig-tek rack (in our model, at least) that goes inside a standard 19" rack. From the back side of this rack, the signal and output connections are - guess what? - standard BNC bayonet type. So, everything works just beautifully, thanks to those threaded miniature to BNC connectors.

I have no idea about its part number, model... but I'm quite sure you'll find some in a hardware shop near you. Take a picture of the accelerometer or itself with you and have some fun shopping... you may find a number of other things you need and dont know already.

Rgds.

Hi Bhrescobar, thanks for your response. I made the cable to connect de input signal with a BNC connector and it worked perfect.

Now, I have other problem, I need to configure the LP and HP filters to flitering out frequencies above 2000 Hz and below of 300 Hz. How I must to set the switches to make it.?

Thanks in advance, and Best Regards.

Cordially, from Argentina.

Guillermo.