Re: Tektronix 577 curve tracer not working properly
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One thing to note that is really important on the 577/177 is there is a calibration routine for the 177. This needs to be completed FIRST before the frame (577) calibration will converge. If you are seeing really weird things This could mean that the calibration is out of alignment. ? In terms of the concave ness of the trace when pushing the 577 to its most sensitive current settings looping capacitance becomes a huge struggle. Especially at the nA ranges. The reading is taken on an ¡°average¡± line through the looping trace. So this might be normal might not. ? Also check the 22 Ohm resisters in the 177. These can be abused and might be burned out or over heated. They are critically important in the vertical amp path as these are what enables kelvin sencing (4 wire) measurements in the 177. They are also in used when 2 wire measurements are being made If I recall correctly though it has been a while since I did that calibrations in my units. ? Zen ?
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From: [email protected] <[email protected]> On Behalf Of Marco Lazzarato via groups.io
Sent: Sunday, October 13, 2024 6:18 AM
To: [email protected]
Subject: Re: [TekScopes2] Tektronix 577 curve tracer not working properly? I have a major update, today when i switch throught all the minor vertical/div settings the yellow light of overrange doesn¡¯t light up, when switching by the 50 to 20 and 10 mA i¡¯ve noticed a lot of noise on the trace, on the 5 (50 mA , 5mA and so on) scale seems better while the noise gets higher reaching the 1 (10mA,1 mA) scale, it gets so bad that the trace becomes a concave curve.Reaching the uA and nA side you can see a part of a vertical trace appear on the very top of the screen.
Seems that changing the Max peak or the series resistors doesn¡¯t affect it.
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