Using the HP41 Handheld Computer to Test Battery Capacity with HP-IL Multimeters and Thermal Printer скачать в хорошем качестве

Using the HP41 Handheld Computer to Test Battery Capacity with HP-IL Multimeters and Thermal Printer

I've set up a small rig with a HP41CX handheld computer, two HP3468A multimeters, an 82162A thermal printer, a constant current load and a breadboard to test the capacity of batteries. Constant Current device - https://contextualelectronics.com/cou... Sometimes battery capacity is well under the specified capacity or the battery may be old or damaged. I use this rig to test mainly rechargeable batteries, single or multi cell. The HP-IL (HP Interface Loop) allows connection of multiple devices in a daisy chain arrangement. I've connected two multimeters and a printer to an HP 41CX. The program running on the HP41CX records the number of cells and this is used to determine the threshold as to avoid over discharging the batteries. The start date and time is stored and printed. One meter measures voltage and when a specific threshold is reached the program records the end date and time. The other meter records the current at the start of the program and stores that so it can be recalled later if a reminder of the current draw is needed. From there, the time and current draw is used to calculate capacity in mAH. Please consider helping support the channel by becoming a patron - www.patreon.com/retro_spective Index: 0:00 - Introduction 4:19 - The HP41CX Handheld Computer 5:40 - HP Interface Loop and attached devices 6:43 - The Current Sink or Swim 8:12 - The breadboard set up 9:19 - Explaining how the program works - print out 12:25 - Starting the program 13:48 - The meters and what they do during program runtime 16:00 - The results 18:08 - Discussing some of the other battery types 19:49 - Upcoming video content 20:36 - Conclusion and thanks