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- Mar 25, 2008
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Well, I purchased an old Coherent Laser Power/Energy Meter on ebay for a pretty good deal. It even came with the thermopile sensor, which I must say, was bigger and much better quality than I expected. The only problem is, the two parts did not come wired together. I have several pictures and I tried inquiring Coherent about the product, but they don't have records going back to 1987. Mainly, I am wondering how thermopile sensors work, since I may end up using the sensor and either making a display or else purchasing a compatible meter display. The sensor has 4 wires it looks like - two for BNC connection, and another set of white and black. I understand the concept of a thermopile sensor (it produces a certain mV per mW, correct?) but my question is does it PRODUCE it, or does it let through? Basically, I metered the wires for voltage coming out when shining a laser or powerful flashlight on it, and I didn't get any readings. Do the sensors need to be powered, and if so, by what voltage?
Additionally, I know it may be hard to see the traces on the circuit board, so I may upload a bigger picture or else forget about salvaging it. However; I found two wires going to the AC-DC transformer built in, and I think I found where the power comes in, but who knows for sure since the one LED on the object did not light up. If anyone has any info on how power meter heads work, it would be greatly appreciated.
Thanks in advance.
Alex
If you can see in these last two pictures, it looks like there are two traces going to the AC-DC module. It appears those two wires are wrapped in white tubing, different than all the other wires. Tracing back to the front, those two wires are right next to the big green one which is obviously ground. Thus, I assume those are the power input wires, and I am assuming it runs off 110AC since the serial number ends in a "/110", but again, all these are assumptions of a topic I don't know much about, so if anyone thinks otherwise, it is appreciated.
Additionally, I know it may be hard to see the traces on the circuit board, so I may upload a bigger picture or else forget about salvaging it. However; I found two wires going to the AC-DC transformer built in, and I think I found where the power comes in, but who knows for sure since the one LED on the object did not light up. If anyone has any info on how power meter heads work, it would be greatly appreciated.
Thanks in advance.
Alex
If you can see in these last two pictures, it looks like there are two traces going to the AC-DC module. It appears those two wires are wrapped in white tubing, different than all the other wires. Tracing back to the front, those two wires are right next to the big green one which is obviously ground. Thus, I assume those are the power input wires, and I am assuming it runs off 110AC since the serial number ends in a "/110", but again, all these are assumptions of a topic I don't know much about, so if anyone thinks otherwise, it is appreciated.
, looks like I'll be needing to do a bit more research now, perhaps I'll be back later when I get more info.