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  1. S

    Watlow Process Controller Help

    If you can't find someone who can identify this by sight: Open the instrument, and look for a tag inside (or affixed to the back of the unit). There's gotta be SOME kind of identifying information on or in that instrument. (If you've tried all that. Look at the motherboard inside, and get a...
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    HELP Please

    The data sheet is your friend.
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    Needing Tektronix 516 Oscilloscope Troubleshooting Assistance

    Hope you get a manual. My guess would be a bad CRT itself, or bad High Voltage supply to CRT (big electrolytic caps the ususal suspect). Did you look at the CRT yoke when the power is on? Do the filaments light when the power is on? Do you HAVE voltage to the CRT filaments? If you've got...
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    Philips multimeter PM2412A

    I don't have a schematic, but I have a suggestion. Get inside of the meter, and look for the fuses.
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    Embaressingly simple: 120v power relay,

    Do you have a DVM to check the 12V, I wouldn't assume it's DC (sure, the LEDs run DC, but it's getting rectified to DC somewhere in there). You'll need to pick off the 12vdc after the rectifier circuit (which will lead to the LED assy). Sounds like you have a 'meter'. If you're on the DC scale...
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    Weller EC1002 station displays EEE

    I checked with the other techs I work with. No one familiar with your error code. I checked the manual for the Weller I'm using now (WD 1), and it's useless for error codes, ...so I imagine any manual you got for yours would be as useless. Repairing Wellers with their parts has become VERY...
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    Weller EC1002 station displays EEE

    Not familiar with your problem, if I find out anything I'll repost a reply. My experience with the Wellers in the past, is that there is a temperature sensor in the iron handle that often fails. So you MAY be right, that it might not be the base. Good luck
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    Needing Tektronix 516 Oscilloscope Troubleshooting Assistance

    I assume you mean a Tektronix 516. I don't have a manual on that. Are there any other lights in the face display, any way to see if the instrument is getting power, and not just the CRT? Typically in old scopes, the power supply is the problem, usually the big electrolytic capacitors dry out...
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    Embaressingly simple: 120v power relay,

    The concept sounds fine. You should find plenty of information on the internet on relays and wiring them. You'll have to trigger the relay with the low voltage LED circuit, and use the CONTACTS of the relay to run your high voltage (independently to run the halogen lamp). That will entail...
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    Nodal analysis

    http://www.allaboutcircuits.com Volume 1 Chapter 10 Page 4
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    How Do I Clean the Green Corrosion on the Contacts?

    I haven't used any of the three contact cleaners you took the picture of. Read the labels, and find the one that meets your requirement. I specifically look for ones that say they're 'Safe For Most Plastics'. I had a friend who used a contact cleaner spray can on a clock/radio, and the...
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    How Do I Clean the Green Corrosion on the Contacts?

    I don't know what CAUSED the green corrosion, but copper turns green as it oxidizes. I use isopropyl (spelling?) alcohol to clean off the boards. Is maybe the caliper being stored in some atmosphere that might promote corrosion? Or exposed to moisture which might hasten corrosion? Just...
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    What switch do I need?

    Well, think the circuit through. I thought you wanted the momentary contact to engage at the same time as the full-closed contact (Third position). If you can USE the three position switch, to engage the momentary contact, and THEN continue travel to the third position closed contact. It...
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    "House" numbered parts

    Bad news. I'm racking my brains looking through the ON data books I've got. First, I have Revision 7, May 2000 Thyristors. There's a really nice note in the front of the book saying THIS revision, has dropped data sheets ('from Rev. 6 Data Books') for the S2800 series. So my bet is, your...
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    PTFE covered wire - how to strip off the PTFE?

    It may seem like a pain, but I use an Exacto-knife. Make a complete cut, all the way around the wire. It's the only thing I've found that works consistently. I have one of the hand-held multi-sized wire strippers (Ideal Stripmaster). If you have a LOT of stripping to do, I'd consider one...
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    Treadmill troubles

    Manufacturer? Model Number?
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    "House" numbered parts

    Do you know WHO the devices were manufactured for? Maybe you might get lucky if we know what company the parts were made for. I know it's a long-shot, but I've got the last PRINTED set of ON Semiconductor data books at home (where I'm not AT, right now). The ON Semiconductor numbering system...
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    What switch do I need?

    I don't remember ever seeing a switch like you describe. The three position switch, with second (momentary contact through switch travel to third positon), doesn't seem to meet your requirement (but only you would know that for sure). Have you thought about adding a relay to your switch...
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    coil test

    We probably need more information on your circuit. The coil will be measured in micro-henries, the capacitor is measured in micro-farads. I'm thinking you have a specific calculation in mind, about measurements or losses in the tank (L/C) circuit. And we can only guess what that specifically...
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    coil resistance of an inductor

    If this is a basic question, the basic answer is: It depends on your operating frequency.
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