| Products > Test Equipment |
| Help needed - Siglent TPA10 / Tektronix TekProbe offset not working |
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| FlexibleMammoth:
The p6247 is working with tape over pin5 as if the scope was set to 0v offset, so my probe is good. |
| FlexibleMammoth:
--- Quote from: tautech on February 09, 2022, 11:57:22 pm ---Yet we don't fully understand how the 1V offset feedback pin works. When the probe Offset control is ON does the scope sense the probes offset setting ? IDK. Attached is a pic of the probes preamp. --- End quote --- Just tested the ADA400A with taped over pin5, no difference. Offset off = no one controls offset, offset on = probe only controls offset. So it appears that ADA does not care about pin5 and uses traditional offset? My sds5000x does not actively respond to anything I do on the ADA. |
| alm:
--- Quote from: FlexibleMammoth on February 10, 2022, 12:08:27 am ---Yep, they could have put a nice vernier knob like on the old 7000 series to provide a mechanical readout… if I am annoyed enough I might actually make a project from that idea. --- End quote --- The ADA400A was a modernized version of the 7A22/5A22N/AM502/3A9. All of these had a simple concentric pot for course / fine without any scale. Clearly the customers for this plugin didn't mind this. The 7A22 (but not the other ones) did have a Vc out so you could hook up an external voltmeter to measure the offset voltage. The 7A13 was a different product available at the same time that was marketed as a "differential comparator" and had the 0.1% accurate 4 digit vernier for very precise offsets. I don't believe Tektronix ever made a modern version of the 7A13 (except maybe in the 11000 series), but Preamble Labs, and later Lecroy, did with the DA1855. --- Quote from: FlexibleMammoth on February 10, 2022, 12:23:30 am ---The p6247 is working with tape over pin5 as if the scope was set to 0v offset, so my probe is good. --- End quote --- That's good to know! So the problem is that the Siglent adapter is incompatible with this probe, and probably with any probe that relies on the TekprobeII interface to set the offset. --- Quote from: FlexibleMammoth on February 10, 2022, 12:29:49 am ---Just tested the ADA400A with taped over pin5, no difference. Offset off = no one controls offset, offset on = probe only controls offset. So it appears that ADA does not care about pin5 and uses traditional offset? --- End quote --- I'd say the ADA400A is designed to be used with only the offset knobs on the ADA400A. |
| FlexibleMammoth:
--- Quote from: alm on February 10, 2022, 12:35:51 am ---The ADA400A was a modernized version… --- End quote --- I do have a 7000 series mainframe, and was thinking about getting a 7a13, as the da1855 is unobtainium… the only „cheap“ one I saw went for €700 in combination with a scope. --- Quote from: alm on February 10, 2022, 12:35:51 am ---That's good to know! So the problem is that the Siglent adapter is incompatible with this probe, and probably with any probe that relies on the TekprobeII interface to set the offset. --- End quote --- I’d say the Adapter is defective. 2.5V should not be at a pin specified for +/-1V by tek. EDIT: Also the specs of the adapter list the offset as +/- 1.2V, which makes a 2.5V offset voltage even more unlikely... --- Quote from: alm on February 10, 2022, 12:35:51 am ---I'd say the ADA400A is designed to be used with only the offset knobs on the ADA400A. --- End quote --- Very likely. I would still like to have working passive-style offset for other probes that do not support pin 5 :( |
| tautech:
--- Quote from: alm on February 10, 2022, 12:35:51 am --- --- Quote from: FlexibleMammoth on February 10, 2022, 12:23:30 am ---The p6247 is working with tape over pin5 as if the scope was set to 0v offset, so my probe is good. --- End quote --- That's good to know! So the problem is that the Siglent adapter is incompatible with this probe, and probably with any probe that relies on the TekprobeII interface to set the offset. --- End quote --- From investigations it does seem TPA10 is a TekProbe2 device. however there is no mention of this in documentation or on websites. Should TPA10 also be TekProbe backwards compatible ? Can anyone test TPA10 with an older Tek probe that only uses the TekProbe interface ? |
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