FWIW, scintillation in this context means flashing, the digit you have selected to adjust will flash.
Yes I agree.
It seems you just trial-and-error it to get it right.
Or just throw it in the bin and buy a Hakko FX-888
One or the other at this point.
My take on the cal mode is here.
1. Briefly press either up or down key to move on the desired preset temperature P1 to P5 etc.
2. Set 380 oC, select P4 profile 400oC press down key for 3 seconds to enter temp adjust mode, then press down button again till display reads 380oC. To increase current temp use the up button till required temp is displayed. This is a temporary adjustment only.
So far yes, I've done that temp adjustment before I tried to cal and it worked OK.
3. To cal the tip, do the following, let’s say that P2 (pre-set at 300) reads on your calibrator as 280oC, select P2 and press both up and down keys together and digits will flash. Press the up key till the display reads 20 and then press both keys together to save the setting which should add 20oC to the stored setting of 300 but in reality is 280 as displayed on your tester.
4. Check the temp again on your calibrator and see if it matches the displayed setting of 300oC.
5. If not repeat the step 3 and use either the up or down key to add or subtract to the stored preset.
6. Check again and repeat until it is correct. Repeat process for other pre-sets if required.
Yes I did try that kind of adjustment. But now I can't get it back down in temperature. There is no "negative" entry mode - only positive numbers.
So if it was originally in error in a positive direction (mine was too cold by 40 C) - how would a person correct it? You can't go negative. So still it's a mystery as to what the numbers you enter really are doing.
Let's see what the "video" is all about. I suspect it will be a bucket of sh*t and won't help. But let's see. I will report back.
My take on the instructions is that once you have entered into the CAL mode for a particular P setting, the down button is used if your tester shows a higher temp them displayed and then the displayed figure that select using the down button is subtracted from the original stored setting.
The up button is used if the tester shows a reading that is lower then the stored temp.
So in other words down button selects the amount that you want subtract from the stored value and the up button selects the amount that you want to add to that stored value.
What it does not make clear is if the numbers will keep scrolling up or down till you reach the number you require as long as you hold down the respective key. You may have experiment a bit there as it mentions Hundreds, Tens and singles so maybe if you press and release a button and the press the button , maybe the digit that you are going to be altering is selected in that method, ie, each press and release will cause a digit in a column to flash which will indicate the digit that you are changing??