| Electronics > Repair |
| Keithley 2000 TF-245 version / year question |
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| Overspeed:
Hello Following a doc locate on this forum ( see linked pic ) there is several version of the TF-245 My question : does there is equivalent , different design but pin to pin alternative ? I plan to make a patch base on 0603 component Regards OS |
| Kleinstein:
I don't think the diagram of the A version makes much sense. it could be more like showing the measured resistance, not counting indirect paths. The verion B should be the right one. The resistor array should be rather stable. So a circuit from separate 0603 size resistors could be tricky. A final solution may want at least some resistor arrays for parts of the job. One may not have to replace the whole array. There are different sections: 1) ref. amplification can get the auxiliary 13.3 V for the ohm part. 2) an auxiliary voltage for pin 14 for the fine slope of the ADC (not that critical) 3) the 3 resistors ~ 30 K for the integrator input (could likely be 3 equal values) 4) the gain part (1K+9K+90K) |
| Overspeed:
Hello Dear Kleinstein Thanks Thanks I work on a patch base on a modified SAMTEC header and a PCB on the top to allow 0603 resistor , I can solder easily 0603 perhaps 0402 Just make a mock-up right now , TF-245 is real source of problem and as 2000 / 2700 and other Keithley are now quite old that avaibility problem Regards OS |
| coromonadalix:
other thread who talk about it https://www.eevblog.com/forum/repair/keithley-tf-245-replacement-options-(k2000-models)/ |
| marcumr:
HELLO. Some time ago one could order from Keithley-Tektronix (U.S.A.)the famous and sought-after TF-245. I never managed it. |
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