Calibration Procedure for TK15 200312 Coulomb Meter

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Greg DeCecco
June 9, 2020 at 12:28 pm

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#39387 Reply |

Where can I find the calibration procedure for the TK15 200312 coulomb meter?

Drok
Keymaster

June 10, 2020 at 7:59 am

Post count: 2971

#39415 Reply |

Hello Greg DeCecco,

There is no calibration procedure for 200312.

May I know what you need to calibrate? Or do you mean program procedure?

Best regards.

Greg DeCecco
June 10, 2020 at 1:07 pm

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#39423 Reply |

I used a Rigol DL3021A electronic load to gauge the accuracy of the TK15 and found the TK15 is reporting twice the amps compared to the DL3021A. Because the reported amperage is incorrect, other reported metrics are also wrong: watts, amp hours.

Drok
Keymaster

June 11, 2020 at 7:07 am

Post count: 2971

#39456 Reply |

Hello Greg DeCecco,

Did you try to check the current with other multimeter? And did you use 0.3-0.75mm² sampling cable?

May I know how large the load current it is and connection details? It would be apprecaied if you can take some images to show the connection.

You can share images here or send them to service@droking.com

Best regards,

DROK

Greg DeCecco
June 11, 2020 at 11:37 pm

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#39500 Reply |

In the following photos, the power supply is up top, the coulomb meter is in the middle, and the electronic load is on the bottom. Amps are circled in red. Watts are circled in blue. The power supply is a GW Instek GPS -1850D. The power supply can show either Volts or Amps, but not both at the same time. The electronic load is a Rigol DL3021A. The cables in this demonstration are 12 AWG. The illumination of the photos is poor because the camera had to set its exposure based upon the coulomb meter display; otherwise the coulomb data was not visible.

Greg DeCecco
June 11, 2020 at 11:41 pm

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#39501 Reply |

This is the test setup. The coulomb meter is mounted inside a tool chest, so I had to find a way to get everything into one picture. The current flows from power supply –> 40 Amp breaker –> coulomb meter –> load. Nothing else is in the circuit.

Drok
Keymaster

June 12, 2020 at 7:10 am

Post count: 2971

#39508 Reply |

Hello,

Is the sampling cable 12 AWG? In that case, cross area should be over 3.3 mm², is it right?

We suggest that should be 0.3-0.75 mm². And please try zero point calibration.

Ater enter setting menus, please scroll through to the fourth option. Notice: it need be operated without any load current.

Best regards,

DROK
Greg DeCecco
June 12, 2020 at 10:34 am

Post count: 0
#39512 Reply |
12 AWG = 3.31 mm² cross-sectional area.

Here is a conversion table for your future reference: https://www.engineeringtoolbox.com/awg-wire-gauge-d_731.html

I disconnected the load, set the power supply to 18 V, and pressed the ‘OK’ button for several seconds. It entered the configuration menu which provided the following options:
- Capacity
- Full Voltage
- Zero Voltage
I tried pressing the Up/Down buttons to scroll, but those are the only three options available; no fourth option.
Greg DeCecco
June 12, 2020 at 1:23 pm

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#39514 Reply |

I found these instructions online: http://myosuploads3.banggood.com/products/20190805/20190805224015TK15batterytesterinstruction.pdf

At the bottom of “Page 4”, it shows a menu option for drift adjustment. My controller does not have this option. When the power is first applied, “version 5.4” is briefly displayed on screen.

Drok
Keymaster

June 15, 2020 at 9:40 am

Post count: 2971

#39601 Reply |

Hello Greg DeCecco,

We checked your pictures again. It is yellow board, which is old version actually. The fourth option is indeed not available.

Could you please try to change 0.3-0.75 mm² sampling cable?

Best regards.

Greg DeCecco
June 17, 2020 at 2:13 am

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#39660 Reply |

I don’t currently have any wire that is larger than 12 AWG, so I built some cables using two strands of 12 AWG. This effectively results in a 9 AWG cable, according to this Wire Combination Calculator. 9 AWG cable has an effective cross sectional area of 6.63 mm².

Here are new photos using the twin 12 AWG cables (effectively a single 9 AWG cable).

This last photo is great because my power supply (GW Instek GPS-1850D) is only rated to deliver 90 Watts (18V @ 5A), but your meter says it is delivering 179 Watts. 🙂

Drok
Keymaster

June 17, 2020 at 7:19 am

Post count: 2971

#39666 Reply |

Hello,

The cable size we suggest is 0.3-0.75 mm². According to your inforamtin, 12 AWG= 3.31 mm², that is already over the range.

You should use smalller one. “0.3-0.75 mm²”

Best regards.

Greg DeCecco
June 23, 2020 at 2:50 am

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#39944 Reply |

My apologies for not responding sooner. Life sometimes gets in the way of life.

When you say “sampling cable”, are you talking about the cable that goes from the positive battery terminal to the B+ terminal on the sensor? I’ve added a big yellow arrow pointing to the red cable that I think you’re talking about. This cable has been the same piece of wire in all the previous pictures. This red cable is 18 AWG and has a cross sectional area of 0.82 mm².

Drok
Keymaster

June 23, 2020 at 7:27 am

Post count: 2971

#39955 Reply |

Hello,

Yes, that is sample cable. cross sectional area should be in the range of “0.3-0.75 mm²”

Greg DeCecco
June 23, 2020 at 1:16 pm

Post count: 0

#39969 Reply |

My sampling cable is 18 AWG and has a cross sectional area of 0.82 mm². This cable’s diameter is larger than the documented cross sectional area of 0.3-0.75 mm², which is fine. The sticker on the TK15 says it draws a max of 1.2W, which is easy for an 18 AWG cable. Can we move on?
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