Since the DMM6500 can take simultaneous readings of current and voltage is there some script to measure power other than using a shunt resistor?
The device cannot measure current and voltage simultaneously. Voltage only or current only. At the same time spending a relay resource.
How was I able to measure the DC voltage using the rear ports and DC current as a secondary measurement then?
There were no relays switching between the two modes
MegaVolt is right, the DMM6500 can't measure Voltage and Current simultaneously, but you might not always hear relays clicking. There are a couple range combinations that don't require a relay switch, typically because the the signal paths use the same range resistors. 10V and 1A is an example combo, but there are a few others. This behavior was the same for the 7510 as far as I know, but the range combinations might be different.
Hi everybody,
I'm looking since several month for a reliable mean to measure current profiles on low power devices, like IoT sensors or any othr projects with low idle current and peaks working currents. If possible with a cost < 1000 euros.
When I saw the DMM6500 I thought my problem would be solved, through the high frequency sampling, that would ease measurements of low duration events (for example active current duration of 50µs with 500µs sleep.
But when I read the full specs, I see that :
- I can use normal measurement mode up to 20.6ksamples / secs with 4.5" resolution ("Typical Reading rates, DC function" at page 17, and "DC Current noise Charac" at page 10
- if I use Digitizing feature, according to table at page 16, I can get only 8 ENB at 50kHz sampling (400µA for 100mA range), and resolution is not specified after 50ksps. That's strange...Or may I misunderstand the 1/10/50kHz indication in the table ?
I don't understand something in the DC Current Accuracy specs (page 10). For 100mA caliber, I see that error is 0.01 + 0.03 within 24h after cal, and 0.015 + 0.005 after 90 days. Why is the range error so high (0.03% of 100mA = 30µA !) and is reduced after 90 days (0.005% = 5µA) ?
Thanks
Aurelien
You're right with the typical reading rate, but as an aside, the 4.5 digit is just the spec'd accuracy. You can command the instrument to return 6.5 digits at the maximum sample rate if you wanted.
On the Digitizing table, the 1 kHz/10kHz/50kHz is the
input signal, the sampling rate for that table is fixed at 1 MS/s. That table is largely to help with audio measurements, so the team decided to stop at 50 kHz, high above the typical 20kHz max for the audio spectrum.
On the DC Current specs, it looks like someone made a mistake, it's supposed to be 0.01+0.0
03 within 24h. A bit of background: you're looking at the
Datasheet which, I think, is auto generated every so often. There's also the
Specifications which is controlled directly by engineering (
found here). The specs right now have the correct number, being +0.003%range. There's not supposed to be any discrepancy between the Specs and Datasheet though, I'm not sure how that even happened since I thought the process was automated but I'll put in a bug report for the website team, sorry for the confusion!