Hello,
We are using Keysight 34465A 6 ½ Digit Multimeter for testing power consumtion of low power sensor. But we got stuck on calibration of device. I saw this e-mail in keysight forum and wanted to consult you about this topic.
Our device’s approximate current consumptions;
- In sleep mode, 5- 200uA
- In normal mode, 3-5mA
- In transmit mode, for low power: 100-120mA, for high power 900-950mA
- In receive mode, 10-15mA
So I want to analyze power consumption of this device. I used digitizing method with 1ADC dynamic range. In results, i got so many minus values up to -500 uA. So, how can i compansate these values. I will send 1 screenshoot as a attachment. Can you help us about calibration ?
Best regards.
Ramazan Çetin
GOHM Electronics
Digitize mode may not be the right choice for this measurement, because the very short measurement apertures used have high noise levels particularly if any power line frequency noise is present in the measurement environment. The 1 year accuracy spec for the 1A range is +/- (0.08 % reading + 0.01 % range). The 0.01% range term = +/- 100 uA for 10 PLC measurement. The additional noise for an 0.006 PLC measurement is another 0.01% of range for a total of +/- 200 uA of noise. I need to figure out how to interpret the digitizing SFDR and SNDR specs.
Digitize the voltage of a short with zero current and you will see this limit including the line frequency noise pickup. I'm not at all surprised that it would be +/- 500 uA or more. Noise shows up as the peak-to-peak values and you will see positive and negative peaks. If you want to know the average current values for each mode and can put the DUT in that mode for 1 power line cycle or more a single 1 or 10 PLC aperture for each mode will give you high accuracy results.