121GW - calibration killed after Firmware-Update?! - Page 1
Forum section: electronics / testgear

author: Komposter
author_rank: Newbie
timestamp: October 18, 2018, 07:15:26 pm
content: Hi!After updating my meter from 1.21 to 1.51 my calibration-data is partially killed.I restored my backup, but that didn't fix the problem.Is there something else, I can do, except sending it in for a recalibration?Can someone post his cal-file, so that I can test it to exclude a hardware-problem?Here is my cal-file, decoded with the script I found in the forum:Misc Factors:Internal thermistor: 393HY3131 Frequency: 0 HzDCV5.0000V: Offset: 102, Gain: 1/61.1820450.000V: Offset: 328, Gain: 1/62.82518500.00V: Offset: 257, Gain: 1/62.97361000.0V (and LowZ): Offset: 96, Gain: 1/63.086832ACV5.0000V: Offset: 21961, Gain: 1/62.2256Frequency nonlinearity coefficients:100kHz: 500mV: 943, 5V: -12320kHz: 500mV: -55, 5V: -95250.000V: Offset: 22433, Gain: 1/62.19126Frequency nonlinearity coefficients:100kHz: 5V: 871, 50V: -60920kHz: 5V: -121, 50V: -1461500.00V: Offset: 21403, Gain: 1/62.3602Frequency nonlinearity coefficients:10kHz: 50V: 382, 500V: 32011000.0V (and LowZ): Offset: 22470, Gain: 1/622.383488Frequency nonlinearity coefficients:10kHz: 60V: 45, 600V: 4001ms Peak: Offset: -147, Gain: 1/1.082722DCmV50.000mV: Offset: -714, Gain: 1/6.21588500.00mV: Offset: 702, Gain: 1/62.76796ACmV50.000mV: Offset: 2500, Gain: 1/61.99774Frequency nonlinearity coefficients:100kHz: 5mV: 847, 50mV: -1239500.00mV: Offset: 2070, Gain: 1/62.01416Frequency nonlinearity coefficients:100kHz: 50mV: 669, 500mV: -2327Temperature: Offset: 454, Gain: 1/6.22358Resistance50.000Ω: Offset: 577, Gain: 1/7.52888500.00Ω (and Continuity): Offset: 395, Gain: 1/75.303445.0000kΩ: Offset: 172, Gain: 1/75.37682450.000kΩ: Offset: 108, Gain: 1/75.51892500.00kΩ: Offset: 47, Gain: 1/77.420725.0000MΩ: Offset: 78, Gain: 1/124.59898450.000MΩ: Offset: 90, Gain: 1/122.64012Nonlinearity coefficient: 87Diode: Offset: 0, Gain: 1/31.1203Capacitance10.00nF: Offset: 8389, Gain: 1/14.7948100.0nF: Offset: 8349, Gain: 1/147.30081.000µF: Offset: 0, Gain: 1/1478.5651210.00µF: Offset: 0, Gain: 1/1694.696100.0µF: Offset: 0, Gain: 1/16842.5446410.00mF: Offset: 0, Gain: 1/1245.14904ACµVA5V*50µA: Volts Offset: 21163, Gain: 1/62.24492Amps Offset: 5024, Gain: 1/124.72013650V*50µA: Volts Offset: 20983, Gain: 1/62.59712Amps Offset: 5127, Gain: 1/124.8895045V*500µA: Volts Offset: 21158, Gain: 1/62.2558Amps Offset: 2, Gain: 1/125.1183650V*500µA: Volts Offset: 20946, Gain: 1/62.60438Amps Offset: 6, Gain: 1/125.25884ACmVA5V*5mA: Volts Offset: 21176, Gain: 1/62.22568Amps Offset: 5082, Gain: 1/126.2294450V*5mA: Volts Offset: 20970, Gain: 1/62.20692Amps Offset: 5123, Gain: 1/126.300365V*50mA: Volts Offset: 18032, Gain: 1/62.29684Amps Offset: 1507, Gain: 1/126.39202450V*50mA: Volts Offset: 20956, Gain: 1/62.20952Amps Offset: 5, Gain: 1/126.49368ACVA5V*500mA: Volts Offset: 21272, Gain: 1/62.20432Amps Offset: 5274, Gain: 1/133.66642450V*500mA: Volts Offset: 21018, Gain: 1/62.23128Amps Offset: 5314, Gain: 1/133.7663445V*10A: Volts Offset: 21711, Gain: 1/60.7784Amps Offset: 11, Gain: 1/134.66849650V*10A: Volts Offset: 21210, Gain: 1/61.67086Amps Offset: 3, Gain: 1/134.740608ACµA50.000µA: Offset: 2717, Gain: 1/125.04032500.00µA: Offset: 2953, Gain: 1/125.11756DCµA50.000µA: Offset: 1160, Gain: 1/75.37924500.00µA: Offset: -357, Gain: 1/12.66064ACmA5.0000mA: Offset: 2977, Gain: 1/126.30770450.000mA: Offset: 2891, Gain: 1/126.409416DCmA5.0000mA: Offset: -2873, Gain: 1/76.15229650.000mA: Offset: -256, Gain: 1/12.79048ACA500.00mA: Offset: 3133, Gain: 1/133.777685.0000A: Offset: 3169, Gain: 1/133.8485610.000A: Offset: 35, Gain: 1/134.454192DCA500.00mA: Offset: -2877, Gain: 1/80.666645.0000A: Offset: -258, Gain: 1/13.5474610.000A: Offset: -256, Gain: 1/135.479504DCµVA5V*50µA: Volts Offset: 51, Gain: 1/61.18784Amps Offset: -2059, Gain: 1/75.44866450V*50µA: Volts Offset: 197, Gain: 1/62.87052Amps Offset: -2321, Gain: 1/75.43985V*500µA: Volts Offset: 50, Gain: 1/61.18944Amps Offset: -418, Gain: 1/12.6665250V*500µA: Volts Offset: 174, Gain: 1/62.87176Amps Offset: -424, Gain: 1/12.6673DCmVA5V*5mA: Volts Offset: 5, Gain: 1/61.19048Amps Offset: -2816, Gain: 1/76.1471650V*5mA: Volts Offset: 143, Gain: 1/62.83512Amps Offset: -2920, Gain: 1/76.1799365V*50mA: Volts Offset: -13, Gain: 1/61.20266Amps Offset: -229, Gain: 1/12.790850V*50mA: Volts Offset: 141, Gain: 1/62.83952Amps Offset: -313, Gain: 1/12.79828DCVA5V*500mA: Volts Offset: -60, Gain: 1/61.1095Amps Offset: -2779, Gain: 1/80.67822450V*500mA: Volts Offset: 135, Gain: 1/62.83042Amps Offset: -2732, Gain: 1/80.703085V*10A: Volts Offset: 692, Gain: 1/59.77082Amps Offset: -253, Gain: 1/135.52609650V*10A: Volts Offset: 141, Gain: 1/62.6857Amps Offset: -357, Gain: 1/135.5664Thanks for your support.

author: coromonadalix
author_rank: Super Contributor
timestamp: October 18, 2018, 08:27:34 pm
content: You should put this thread in the right gw121 issues :https://www.eevblog.com/forum/testgear/eevblog-121gw-multimeter-issues/

author: bicycleguy
author_rank: Frequent Contributor
timestamp: October 19, 2018, 12:55:22 am
content: Here's a text file like yours and the BIN. Looks fairly similar, why do you think it's killed?

author: Komposter
author_rank: Newbie
timestamp: October 22, 2018, 03:07:04 am
content: I will do some tests and post test results tomorrow, when beeing back in the workshop.

author: Komposter
author_rank: Newbie
timestamp: October 24, 2018, 12:46:14 am
content: Having 2V DC on the input, gives mein R0 2V DCin R1 2VDCin R2 2V DCin R3 287V DCin R4 OFLHaving 5V AC (50Hz) in the input, gives mein R0 5V ACin R1 a small voltage, counting down to 0Vin R2 samein R3 samein R4 sameIf I raise DC voltage in autorange-mode54V are OK, 100V on input results in 348V on the meter, 200V on input gives 408V on the meter.I also tried the cal-data from bicycleguy - if my meter accepted the data - the result was the same.I'm also confused, whats described in the manual, p52 ... both descriptions end up with"The calibration data will now save to the SD card". My meter everytime shows "save"at the end and I don't know, what happens ...I think, something is seriously wrong here. Anything else, I can do without running a complete calibration-procedure?I'm thinking about sending the meter in for a check.Here in Germany the meters were shipped from a company called Welectron - the also offer calibration-services for test equipment.*confused*

author: joeqsmith
author_rank: Super Contributor
timestamp: October 25, 2018, 02:29:57 am
content: Quote from: Komposter on October 18, 2018, 07:15:26 pmI am not sure what is meant by "I restored my backup". It sounds like you are messing about with both the calibration file as well as the firmware version. Did you reinstall both the 1.21 firmware along with your original calibration file? And when you say install, did you actually install them into the meter or just copy them to the card? I sounds like you may be confused how to do this so I wanted to make sure.Did you make these same measurements prior to making the changes? I would assume you have this data or would not be blaming the firmware upgrade.I have not really done anything with the newer versions of firmware beyond 1.26. If there was a major problem like this with the firmware, I would have thought a lot of people would be posting about it but maybe not.

author: bicycleguy
author_rank: Frequent Contributor
timestamp: October 25, 2018, 02:52:14 am
content: I'm confused too. There's no way putting my cal data in your meter could do anything goodI thought you were just going to look at it to see if yours looked hosed.

author: Brumby
author_rank: Unknown
timestamp: October 25, 2018, 03:08:03 am
content: Quote from: bicycleguy on October 25, 2018, 02:52:14 amThat would worry me too. The whole purpose of having individual cal data is to address the variations in components from unit to unit.Thebestcase scenario of doing that would be to bring such a meter into readings that would look sane - but there is no way in the wide, wide world of sports that I would consider that meter accurate. No way. Not ever. I just would not even try loading up someone else's cal data.QuoteThis is a reasonable thing to do. Just a side by side desk check.