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Re: OT Resistor identification
Does it look like the device on the Newark Canada website? Don Bitters
By Don Bitters <donbitters@...> · #175754 ·
Re: A question from the unwashed relative to: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
If you remember the initial problem, and I think I do, one problem is that the transistors had either broken or missing insulators.? Considering what people can do to "fix" things, some sort of
By Harvey White · #175753 ·
Re: A question from the unwashed relative to: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
I think I did hear that this happened to someone.? However, a phasing test is simple to do amongst other tests. Harvey
By Harvey White · #175752 ·
Re: A question from the unwashed relative to: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
For the scopes... probably not... unless you had a frame... and needed a relatively rough source source of +_ 15V, or +5 volts, for an active probe... so probably not. For the why of the
By Roy Thistle · #175751 ·
Re: OT Resistor identification
Thanks for the help. I had not seen that coding before. A very good day. I learned something. Glenn
By Glenn Little · #175750 ·
Re: A question from the unwashed relative to: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
Yes... but, do they have to be "tested" by incorporating a "fuse tester" in the tester. Seems inelegant to me.
By Roy Thistle · #175749 ·
Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
Add me to the list. I'd like one as a project in the bin.
By nonIonizing EMF · #175748 ·
Re: A question from the unwashed relative to: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
But why? (Surely, frames didn't leave the factory, with miswired phasing [it's been mentioned plug-in were non-disposable back in the day!] ) And as to all the gremlins, re-arranging the wiring,
By Roy Thistle · #175747 ·
Re: Crystals - was(Re: Spectrum analyzer Tektronix 7L13 on mainframe Tektronix 7603)
Yes, ?I once bought some crystals for an HP3456A from krystaly ¨C I found them helpful and easy to deal with. Regards Kerry From: <[email protected]> on behalf of Tam Hanna <tamhan@...>
By Kerry Burns · #175746 ·
Re: OT Resistor identification
It's using the RKM code convention (and IEC thing, IIRC). Your guesses were pretty good. 4L0 means 4 milliohms. --Cheers Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford
By Tom Lee · #175745 ·
Re: OT Resistor identification
It could be a 4mR resistor. ROHM makes SMD shunt resistors in that range. "4L0" would indicate a 4mR resistor, 5% tolerance in the PMR Series. See the datasheet here:
By Chris Wilkson · #175744 ·
Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
Please add me to the list of participants.
By radeng · #175743 ·
OT Resistor identification
I have a battery BMS that I am reverse engineering. I have a resistor with a code that I have never seen and cannot find any information on. The resistor is a SMT device marked 4L0. The L appears to
By Glenn Little · #175742 ·
Re: A question from the unwashed relative to: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
My perspective being an electronics, amateur radio and RF engineering born again newbie with more from a chemist, with a chemometrics, programming, lab qualification/validations and leadership
By nonIonizing EMF · #175741 ·
Re: A question from the unwashed relative to: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
I should mention one other thing.? To make the inboard power supplies more possible, and to remove heat from the module, TEK put in a general purpose PNP power transistor and a general purpose NPN
By Harvey White · #175740 ·
Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
I'm also very interested, but pulling the trigger does depend on the approximate price. Dave S.
By Dave Seiter · #175739 ·
Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
Larry With the greatest respect, you're putting the cart before the horse. You have ten committed purchasers, and I am sure many more like me who are waiting to see the price. So why not get a price
By EJP · #175738 ·
Re: A question from the unwashed relative to: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
Thank you very much, Harvey, for that great historical summary! ¡ª Happy New Year Tom Sent from my iThing, so please forgive typos and brevity.
By Tom Lee · #175737 ·
Re: A question from the unwashed relative to: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
Ok, perhaps I can clear up a bit of this. Remember that in the 70's to 90's (roughly) there were no (to speak of) FPGA IC's so digital design was lots of 14, 16, 20, and maybe 40 pin chips, depending
By Harvey White · #175736 ·
Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
I have one of the originals, and it is almost certainly "Tek" built as opposed to built from the plans. For one thing, it has a Tek serial number label and silkscreened front panel. Dave Casey
By Dave Casey · #175735 ·