Hi,
I found it is not possible to report an issue on the store page here:
https://www.eevblog.com/product/121gw/
Hence have an issue to report.
According to the current version of the manual, the thermocouple reading cannot be calibrated.
One simple way of doing it is to use boiling/freezing water.
Capture the max temp when you put a K-type probe into your home boiler, make sure it does not touch the bottom where the heater is and you have the first point.
Water with ice would be the second one. Put water with lots of ice, wait. Make sure the probe end-tip does not touch the ice and capture the lowest value.
Is that a good idea?
Best
To some degree (no pun intended ) there is not a huge need to try and 'calibrate' the meter with a K type thermocouple. 'Roughly Checking the Calibration' is about all you can do with your method.
Generally accepted accuracies Type K ±2.20C or ±0.75%
While the 121GW's spec is less than that Temp °C, -200 to 1350°C, K-Type, 0.1°C (resolution), ±0.5%+3°C (stated accuracy)
So inherently because of this you can not get a reading more 'accurate' or known under the spec of the meter. The Meter if it was to be calibrated on the Temperature range would more likely be done against a calibrated source instead.
I purchased a 121GW brand new from the official store in Jan. 2023, and I then downloaded the Meteor app for my iPhone. It works well enough via Bluetooth communication, but I wanted to compare with the official 121GW iOS app here. Sadly, it says Not Available regardless of whether I am signed in with my Apple ID for the USA or my other Apple ID for Japan. Is it region locked to Australia (which would be crazy)? Or is the official app totally dead on iOS for some reason?
The reason I even ask is because I dislike the Meteor app because it lacks a FREEZE/HOLD feature. When logging data with the app via Bluetooth, I want to be able to tap the iPhone screen or a button in the app to freeze the waveform display so I can better examine it. If I stop logging, the frustrating Meteor app dims out the waveform display, making it harder to see! I wanted to download the official 121GW app to see if it works better than Meteor in that regard. But again, I can't find the iOS official app anywhere now in 2023!
I purchased a 121GW brand new from the official store in Jan. 2023, and I then downloaded the Meteor app for my iPhone. It works well enough via Bluetooth communication, but I wanted to compare with the official 121GW iOS app here. Sadly, it says Not Available regardless of whether I am signed in with my Apple ID for the USA or my other Apple ID for Japan. Is it region locked to Australia (which would be crazy)? Or is the official app totally dead on iOS for some reason?
The reason I even ask is because I dislike the Meteor app because it lacks a FREEZE/HOLD feature. When logging data with the app via Bluetooth, I want to be able to tap the iPhone screen or a button in the app to freeze the waveform display so I can better examine it. If I stop logging, the frustrating Meteor app dims out the waveform display, making it harder to see! I wanted to download the official 121GW app to see if it works better than Meteor in that regard. But again, I can't find the iOS official app anywhere now in 2023!
I didn't do anything with the IOS app, it hasn't changed since the original release, so AFAIK should still be available. I don't have an iPhone so I can't check.
Before you get too excited about the original app know that the 'HOLD' feature only holds the text value. The graph continues to scroll.
I have the app on a 2015 iphone6 with ios12. It still works as originally.
121GW does not show up in the app store because unfortunately apple while claiming to be environmentally sensitive has determined that this phone is too old for them to allow updates to the latest ios16. They want users to trash their perfectly fine phones and buy new ones.
Since Seppy doesn't even own an iPhone he is not a likely candidate to update the app. It would be nice and perhaps help sales of 121GW if Seppy posted the source code on GitHub so others could update the app. I don't understand why Dave doesn't make it so.
Since Seppy doesn't even own an iPhone he is not a likely candidate to update the app. It would be nice and perhaps help sales of 121GW if Seppy posted the source code on GitHub so others could update the app. I don't understand why Dave doesn't make it so.
121GW does not show up in the app store because unfortunately apple while claiming to be environmentally sensitive has determined that this phone is too old for them to allow updates to the latest ios16. They want users to trash their perfectly fine phones and buy new ones.
In defence of [Apple culling older apps incompatible with new iOS releases], the overhead maintaining multiple O/S compatibility in an App is not insignificant - and is often impossible with new features only available with newer operating systems.
And so, I do hope that whatever happens now will bring us a better iOS app. Meteor isn't all that bad, but not being able to FREEZE the waveform on my iPhone's screen (without dimming) is a critically important feature that I am totally shocked and amazed that the developer of Meteor didn't consider. It would be great if that developer could read our discussion here, as that may inspire him to improve his app, thereby making my call for the official app to be reinstated to the iOS App Store moot.
(snip....)
The reason I even ask is because I dislike the Meteor app because it lacks a FREEZE/HOLD feature. When logging data with the app via Bluetooth, I want to be able to tap the iPhone screen or a button in the app to freeze the waveform display so I can better examine it. If I stop logging, the frustrating Meteor app dims out the waveform display, making it harder to see!
After spending half the day and live stream trying to do it, thesource code is now on github:
https://github.com/EEVblog/121GW-App-Apple-IOS
also gitlab:
https://gitlab.com/eevblog/eevblog-121gw-app-for-apple-ios
I don't know what @JDW was talking about unless a newer version of this existed at one time. (Attachment Link)
https://www.eevblog.com/forum/testgear/eevblog-121gw-multimeter-issues/msg2314242/#msg2314242
(Attachment Link)
Thanks again for posting these. After spending a full day to figure out, both seem to be for the asci encoded version of the 121GW ble protocol (from 2016 b4 the kickstarter?) so won't work. The IOS version(don't know about android) is called 'Smart Data Logger' and appears to be the long lost version mentioned here:
https://www.eevblog.com/forum/testgear/eevblog-121gw-multimeter-issues/msg2314242/#msg2314242
This is a screendump of 'EEVBlog Smart Data Logger', build 1.0.5 with startup screen data.
(Attachment Link)
Any thing newer?
I don't know what @JDW was talking about unless a newer version of this existed at one time.
This is a screendump of a working version of 121GW, build 1.7, loaded from app store around 2019 I have which doesn't do data logging.
(Attachment Link)
(1) Why does the backlight flash on & off for a split second each and every time I switch on my 121GW? I see no practical reason for that. It's not like you need to TEST the backlight LEDs each time the meter is switched on. And while it comes on too briefly to have a negative impact on the alkaline batteries, the fact remains it does draw more current in that brief split second versus the backlight not flashing on/off at all. Can it be said that is something which should be fixed in firmware?
(2) After switching the meter on, I want to know why it takes 3 seconds before I can use it. Sure, I see it displays the firmware version for 3 seconds. But does the meter deliberately wait 3 seconds solely for the purpose of displaying the firmware revision? Or would the meter take that long to become usable even if the firmware version was not displayed? The reason I ask is because if the meter could become usable faster than 3 seconds after switch-on, that would be beneficial, and perhaps the firmware version could be looked up somewhere in Setup instead of displaying every time the meter is switched on.
Why does any of this matter? Because (1) the 121GW has BlueTooth for some good reason, right? And (2) it's a bother to remove the blue bumper and unscrew the back case each and every time you want to access data logged to the SD card. I'm very glad that SD card exists, but disassembly is required to use it. No disassembly is required to use BlueTooth and a smartphone app, however! Hence my posts on that topic.