Schulze isl8-936g chamäleon

29/05/2026

29/05/2026

Here is the promised factory calibration video, where a fully charged 4S LiPo battery was used as the reference voltage.

The voltage is compared with the voltage on the voltmeter. There is no exact reference voltage. Therefore, at the end of the calibration, SetUref 4200 is not set to a voltage of 4200mV, but the exact value from the voltmeter is used, where the voltage is 4.196V.

This is practically the complete completion of the calibration. A demonstration of the setup and measurements.

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25/05/2026

Today I prepared a kit for ISL8 calibration. The connecting cables are ready for connecting a laboratory power supply and also for connecting using a 4S LiPol battery.

23/05/2026

Practical procedure for factory calibration

The reference voltages 16.800V, 12.600V and 4.200V will be used.

The ideal source is a precise laboratory power supply; as a full-fledged alternative, a fully charged and balanced 4S LiPo battery can also be used.

Use a 12V car battery as a source for the charger.

Press and hold the F2 button and connect the charger power supply to the car battery.

After the calibration menu appears, you can release the F2 button.

Now you need to connect all the plus poles A1-A2-A3 with a modified wire (red) and the minus poles with a second wire (black).

Now everything is ready. The reference voltage 16.8/12.6/4.2V will be connected to these two plus and minus wires for measurement and calibration.

The voltage calibration process itself is manual and contains four points that are repeated several times.

The calibration is switched by pressing the F3 button - TOL A1, TOL A2, TOL A3, OFS A1, OFS A2, OFS A3. The PLUS and MINUS buttons set TOL and OFS.

POINT 1. - 16,800V (4S LiPo) - Set URef 16800 is now set. Use the F3/PLUS/MINUS button to set TOL A1 and A2 to ZERO.

POINT 2. - 12,600V (3S LiPo) - Set URef 12600 is now set. Use the F3/PLUS/MINUS button to set TOL A3 to ZERO.

POINT 3. - 4.200V (1S LiPo) - Now the Set URef 4200 is set. Set the OFS A1, A2 and A3 to ZERO with the F3/PLUS/MINUS button.

POINT 4. - repeat POINT 1-3. Until in points 1. and 2. TOL A1/A2/A3 is ZERO, and until in point 3. OFS A1/A2/A3 is also ZERO.

This procedure sometimes needs to be repeated several times. Every time you switch the Set URef, you must fill in the results for TOL and OFS at zero. Other possible reference voltage values ​​can be used for checking. This procedure ensures that the tolerance will be within the norm in the entire voltage range. I recommend performing a control measurement at Set URef 30.000V - here you will usually measure about 30-70mV more.

The measurement and calibration results statistically prove that the measurement accuracy over the entire voltage range is plus or minus 5-10mV per LiPo cell.

21/05/2026

Celebrating my 3rd anniversary on Facebook. Thank you for your continued support, I couldn't have done it without you. 🙏🤗🎉

20/05/2026

I know it's very premature. But still. Someday the world must come to know how to actually run the factory calibration. It can be done on absolutely every version of the eight series firmware. At the moment, I know this and one very good friend who has been supporting me in this work for years. Someday I will share this procedure, because I will not take it with me to the grave. But it will not be earlier than 2030. I want my work to be appreciated in some way and the amount of costs for this project could be slightly reduced. Forever young ISL8-936G.

17/05/2026

Today I calibrated five chargers and used the factory calibration. I only used three voltages. 16.8/12.6/4.2V. After that I did a test measurement and even 30.0V was fine.

I have verified the procedure and it works perfectly.

Point 1.

I set the TOL to zero for channels A1 and A2 at a voltage of 16.8V. I set the TOL to zero for channel A3 at a voltage of 12.6V.

Point 2.

Then I set the reference voltage to 4.2V and use OFS to set all three channels A1/A2/A3 to zero.

Point 3.

Now I repeat point 1. until TOL=0 and again point 2. until OFS=0. Here we repeat over and over again until the correct result is achieved.

Point 4. Done. You can perform a control measurement on all voltages available for SET UREF. In practice, more values ​​are available. However, only 4,200V, 8,400V, 12,600V, 16,800V, 30,000V, 50,000V make sense.

15/05/2026

How to properly calibrate the ISL8 voltage according to the Schulze program?

Here is the basic procedure.

It is ideal to use a laboratory power supply with memory. We will show you the procedure where we use a fully charged and balanced 4S lipol 16.8V pack.

For initial and accurate calibration, it uses four voltages from the LiPo battery. 4.2V, 8.4V, 12.6V and 16.8V. Schulze has it figured out perfectly.

Prepare the charger to enter the calibration menu by pressing the F2 button. It is ideal to leave the charger on for approximately twenty minutes to warm it up. Power the charger from a 12V car battery.

You need to make a jumper cable that can connect the positive poles of the port and connect to the service connector of the LiPo battery.

Connect the voltage 4S - 16.8V. First set Rtol for A1 and A2 to TOL = 0. Then select the voltage 3S - 12.6V and set A3 to TOL = 0.

Now connect 1S - 4.2V and adjust OFS, for all channels 1-3 to OFS = 0.

This is the very first SETUP. After that repeat the procedure from 16.8V. If TOL deviation is displayed for A1 and A2, adjust to TOL = 0. Switch to 12.6V and adjust TOL A3 to ZERO.

Re-adjust the OFS for A1/A2/A3. Everything should now be at the correct values. Remember that if you change the TOL, you must correct the OFS. TOL is the parent of the OFS. And always adjust from top to bottom.

Switch all voltages a few times and check TOL and OFS. Find a compromise for the best results on all voltages. One will be more, the other less. But in the end you will be able to achieve a max tolerance of 10mV per LiPo cell over the entire range of reference voltages.

If you are charging 6S, 8S, 10S, you should use 30.0V as the reference voltage. And if you are using 14S LiPo, you should also measure at 50.0V.

You can freely switch the voltage to where you need it. Constantly check TOL and OFS. ISL8 allows for fairly precise calibration settings.

15/05/2026

Today we will show the measurement results from the completed factory voltage calibration.

The reference was used for 1S, 2S, 3S, 4S LiPo and 30V.

These are the voltages that the calibration routine allows to use. Important note: “you must always use at least two UREF voltages”.

Here are the measurement results. For each channel, the deviation of the actual voltage from the reference voltage is shown, always for 1S LiPo.

So if 8.410V was measured for 8.400V, then the total difference is 10mV for two LiPo cells and this equals 5mV for one cell.

Calibration ISL8

UREF:
4.200V, 8.400V, 12.600V, 16.800V, 30.000V

Port A1
4.207, 8.396, 12.584, 16.771, 30.062
+7mV, -2mV, -5mV, -8mV, +9mV / cell

Port A2
4.206, 8.391, 12.605, 16.790, 30.022
+6mV, -4mV, +2mV, -2mV, +3mV / cell

Port A3
4.202, 8.401, 12.612, ###, ###
+2mV, +1mV, + 4mV / cell

TOL/OFS
A1 - TOL +4, OFS +66
A2 - TOL -13, OFS +51
A3 - TOL -2, OFS +8

13/05/2026

I want to thank a few people for their patience. This week we managed to fulfill six orders for ISL8. A total of sixteen ROMs with firmware 8.59EN/8.61EN and two RS232 cables. The memories are going to Australia, Spain, Germany and the USA. Thank you and I hope they serve you well.