syncsound Posted August 25, 2022 Report Share Posted August 25, 2022 I'm currently using a pulse-load tester, but getting unreliable results. Any recommendations? Thank you. Quote Link to comment Share on other sites More sharing options...
Rick Reineke Posted August 26, 2022 Report Share Posted August 26, 2022 For a specific voltage measurement, I use a multi-meter set to DC voltage and put a 100 ohm resitor to simulate load. On 9 volt batteries, a 330 ohm resistor is recommended for load. In lieu of a meter and for convenience, I put batteries in a Tx or Rx that has a gauge. Quote Link to comment Share on other sites More sharing options...
Izen Ears Posted August 27, 2022 Report Share Posted August 27, 2022 On 8/26/2022 at 12:17 PM, Rick Reineke said: For a specific voltage measurement, I use a multi-meter set to DC voltage and put a 100 ohm resitor to simulate load. On 9 volt batteries, a 330 ohm resistor is recommended for load. In lieu of a meter and for convenience, I put batteries in a Tx or Rx that has a gauge. Oh man I love this! I'm curious how you were able to determine the value of those resistors? Is the 100 ohm for AAs? I use mostly rechargeables so I don't care about metering them, but sometimes we use lithiums or alkalines and it would be great to meter them under a load! Quote Link to comment Share on other sites More sharing options...
Fred Salles Posted August 27, 2022 Report Share Posted August 27, 2022 2 hours ago, Izen Ears said: Oh man I love this! I'm curious how you were able to determine the value of those resistors? Is the 100 ohm for AAs? Hey, here some of my understanding of it: Ohm's Law: I=U/R (I is current, U is voltage, R is resistance) The voltage of an AA nimh is 1.2v (I don't know how much a lithium AA rate I have never used any.) So 1.2 divided by 100, you have a test load of 12mA. A 2500mAh AA should last around 200 hours under this load if I am not wrong. If you want to test heavier load, lower the resistor, like a 12 ohm for a 100mA load, but the resistor must be rated for at least 2watt (here load is 1.2 watt and a single resistor will start getting hot). The load of 330ohm on a 9v battery will be 27.3mA. Happy testing Quote Link to comment Share on other sites More sharing options...
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