I just got my Joulescope yesterday at work and played around with it for a few hours.
I was very impressed as I’ve been waiting for a tool like this for years.
One of our major products is a wireless transmitter and was eager to get some proper power readings without having to keep switching resistors and messing with the software to measure the current.
The Joulescope worked fine and I thought I would bring it home to play over the weekend. I had the same setup as I had at work and it was working OK until at some point it started giving me strange readings.
Our board goes from about 16uA in sleep up to 150mA when transmitting and I was seeing this at work and first the first hour playing at home. But then for no apparent reason it started showing the sleep current as 1.3mA and the transmit current at 5mA.
I know these numbers can’t be real as the radio has a fixed transmit power and it was still transmitting OK. No software or the hardware hookup had changed.
When it is asleep I can change to the fixed range and it does show the 16uA reading. So something must have gone weird with the auto ranging.
I’m powering this from 2 AA cells so it’s not a power supply issue either.
Anyone else seen this?
I will of course try this at work on Monday in case something weird happened with the software or my PC at home. But I also tried the Linux version at home too and it showed the same.
I do hope it isn’t a faulty unit and I have to send it back. I really want to get to using it after its long anticipated arrival!
Anyone have any ideas to try to resolve this?