EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: ApertureScience on July 14, 2024, 07:04:01 pm
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I have another Keithley 2000 with a broken TF-245 resistor array (pin 4-14 30k). I wrote Tektronix Support, but I want to have a plan B. In my case only one path is broken, so im considering putting another low tempco resistor on top. Any recommendations? I was looking at WELWYN - PCF0805 5ppm surface mount or two NOS Alpha Electronics (20k+10k 5ppm) in series. Those seem to be readily available at 20 Euro for both options.
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Ideally one would like to have matching between the 3 x 30 K resistors. So 1 good external resistor may not be good enough. It is a bit unclear if the 3 resistors should have the same value of maybe a bit different.
For 3 matched resistors I would consider 2 x NOMCT 10 K (or 20 K) using 6 + 3 of the resistors.
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Thank you for the suggestion! I hope the spare part will be in stock, ill post once tektronix has replied back to me.
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there is a project to substitute it here on eevblog ....
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I got a quote from the german spare parts supplier, which is CALPLUS, for 48Euro not including tax and 3-4 weeks lead time. I will go that route.