Tektronix TDS 3032B calibration error - Page 1
Forum section: electronics / repair

author: Jarek
author_rank: Regular Contributor
timestamp: September 05, 2021, 11:17:43 pm
content: Hello everyone .Has anyone solved such a problem?Maybe someone has a schematic diagram of the motherboard?

author: james_s
author_rank: Super Contributor
timestamp: September 05, 2021, 11:34:02 pm
content: It's possible that somebody burned out the input terminator in that channel, what happens if you dismiss the error and try setting it again to 50R?

author: Jarek
author_rank: Regular Contributor
timestamp: September 05, 2021, 11:59:56 pm
content: I did it and the calibration error message also appears.

author: james_s
author_rank: Super Contributor
timestamp: September 06, 2021, 12:14:38 am
content: Does the 50R terminator click on? Have you tried measuring the input impedance to see if it is burned out? It's somewhat common for that to happen, the terminator cannot handle much power. I've heard of people repairing them by soldering a surface mount resistor over the burned out one on the attenuator substrate. It probably won't perform quite as well as it did originally but it beats having an unusable scope.

author: xrunner
author_rank: Super Contributor
timestamp: September 06, 2021, 12:18:24 am
content: Quote from: Jarek on September 05, 2021, 11:59:56 pmI don't have that scope, so I'm going to try to divine what it means. I don't think the termination resistor isnecessarilydamaged (it might be). But I think the system is noting the the voltage was exceeded when it was the selected termination, and it might have put the scope out of calibration because it overheated. It simply noted the excess voltage and the software is supposed to tell you it's now out of cal.But I might also be wrong ...

author: Jarek
author_rank: Regular Contributor
timestamp: September 06, 2021, 12:53:37 am
content: Quote from: james_s on September 06, 2021, 12:14:38 amYes, I measured the resistance on both inputs:50R after switching the probe to 50 R and 1M after switching it has 1M.

author: Jarek
author_rank: Regular Contributor
timestamp: September 06, 2021, 01:01:03 am
content: I did the calibration several times again and only the message as in the picture appears.

author: james_s
author_rank: Super Contributor
timestamp: September 06, 2021, 05:06:41 am
content: What do you see in the error log? It's possible the calibration has just gotten corrupted somehow, it might just need to be calibrated. Calibrating Tek DSOs requires some specialized expensive equipment and expertise.

author: picburner
author_rank: Frequent Contributor
timestamp: September 06, 2021, 09:13:40 am
content: There is autility created by a forum userthat allows, if not the complete calibration, to perform at least one performance check of the whole scope.Even if the requirements for this check are less binding than those of the official program, you must still have at least one SG5030 or R&S SME03 for signal generator and Fluke 510x for DC calibrator.A NI gpib adapter is also required.There is also a Log viewer always on the same site.

author: Jarek
author_rank: Regular Contributor
timestamp: September 06, 2021, 03:17:58 pm
content: Unfortunately I only have SME03, and a DC source and I do not have a GPIB port in the oscilloscope.I can only communicate via LAN.

author: Jarek
author_rank: Regular Contributor
timestamp: September 07, 2021, 12:37:49 am
content: Update....I also noticed that when I switch DC to AC coupling, I can not hear the relay click (if is 50 R and same on 1M) for Ch 1There are clicks on Ch 2.I do not know if there should be a click of the relay when changing to GND, because I can not hear for both channels.This is my first DSO and it is different in my old analog oscilloscope.Does anyone have a schematic of these input hybrid modules?I attach the relay coil connection diagram to ADG361D