The old ird box used to have a little calibration block. You plugged it into the cable and the data collector read a signal like .39 in/s at a frequency. Is there anything out there like that now for todays collectors, that might plug into a 2 pin collector cable? Or does someone know how to buld this i.e. circuit board that takes 20 volts dc and returns ~10 vdc with ac riding along.

Want to do this with a Datapac 1500

That was a good idea, it should be possible. I will look at that, aiming on simulating 1g 10mm/s at 159.2 Hz preferably RMS and 100mV/g accel....... Olov

PCB/IMI makes (made?) a "simulator" that uses a BNC connection. I have some back at the shop. I'll dig one up and try it out when I get back home.

Perhaps Rusty was referring to this PCB ICP Circuit Simulator:

http://www.pcb.com/spec_sheet.asp?model=401A04&item_id=

A Function Generator (Sine Wave) is needed for the AC calibration signal. You could possibly find one on Ebay, make one from a kit (under $50.00), or use PC software and generate signal a signal with sound card (free or low cost). A voltmeter is needed to verify claibration signal level.

Walt

Which IRD box had this? We've got some old stuff out in storage. I could go look if I knew which one to look at.

quote:

Originally posted by Robert U.:
Which IRD box had this? We've got some old stuff out in storage. I could go look if I knew which one to look at.

They were for the 890 and Fast Track. They have a 4 pin mil connector. The top looks like this.

The inside looks like this. I wonder if you had an external power supply, and made up a cable, if you could turn off ICP power on DataPac and get something out of this rascal?

For what it's worth, the other side looks like this

The inside is a little more complex than I imagined. Interesting.

No Walt, it's an honest-to-goodness 'simulator'... says so on the outside I believe. Tomorrow I'll post a pic.

Dymac in the 1980's also made a similar device for checking racks. As I recall the device was primarily for proximity probes. You hooked up the three conductors from the rack (-24 vdc, COM, SIG) to the device and it simulated an output. It alos had multiple frequencies and output levels. This of course took the "normal" proximitor, cable and transducer out of the system so it was strictly a check of the rack. Small and convenient, I doubt it weighed more than 6-8 ounces.

John from PA