B&B Electronics Parallel Printer Card PIOC Manuel d'utilisateur télécharger pdf (Page 13)

extent, this is true. However, the goals of an R/C racer are different than the goals of an

average user. In the case of the R/C racer, there is the need to balance cell longevity with

performance. It is an inherent tradeoff racers make, so you should understand from the

beginning that racers don’t treat their cells “nice”. As a result, they cannot be expected to

last as long as they might in a less demanding application. If you are interested in

ultimate performance, plan to relegate older packs to practice duty after they have been

used for a while. Exactly when you do this is a function of your skill level and how much

you are willing to spend on cells.

How can Cell and Pack Capacity be Measured and Compared?

Pack performance is one of the crucial make-or-break factors in R/C racing. The best

drivers can use every extra bit of voltage and current available from the best packs.

Because NimH and NiCd cells can vary considerably from cell to cell, and because their

performance can degrade or change depending on how we treat them, how old they are,

etc, we need a way to measure and compare our cells in order to identify the best cells, as

well as the best procedures for charging, discharging, and using them. The T35-GFX is

designed to do just that.

Setting up Tests and Comparing Data

The best way to test and measure cell performance is to set up defined conditions for

charge and discharge, and then run these tests on cells to see which cells are the best.

When you do this, it is also important to be aware that the very conditions under which

they are charged and discharged have a direct effect on their performance.

Basically, the idea is to run these tests on cells, looking for the ones that have the highest

average discharge voltage, the lowest internal resistance, and the longest run time.

In general, when charging, you’ll want to strike a balance between a high charge rate

(which minimizes charge time) while keeping cell heating within bounds.

When discharging, you’ll want to try to use the highest discharge rates applicable to the

cell type you are using, in order to test it under conditions similar to actual use. The T35-

GFX can sustain a 35 amp discharge rate.

Racers often ask what will be the effect of increasing the charge current, lowering the

peak detect voltage, etc. The T35-GFX is the perfect tool for getting answers to all these

questions! Which manufacturer’s cells perform better? What rate should we charge at?

All these things can be tested and answered by the racer using the T35-GFX.

You can use it to test single cells or packs.

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B&B Electronics Parallel Printer Card PIOC Manuel d'utilisateur Page 13