Analyzing power consumption on nrf52840-DK with keysight N6705C

[gnrboy]

Hi can you help to configure nrf52840 DK board to measure power consumption with keysight n6705C. In manual is described with ammpermeter and oscilloscope. Keysight n6705c will also be power supply to the nf52840dk via P22 (3.6V DC). Is it enough just to cut SB40 or ? I want just to measure current of nrf52840 and with board leds.

[gnrboy]

or I must connect keysight on p21 ?

which modification ?

[Jared]

Hi,

It's enough to just cut the solder bridge, and set the Keysight to current measure mode.

regards

Jared 

[gnrboy]

I using keysight as a battery emulator and it is then power supply and measure current consumption.

If then a just connect to external supply (p21) and how must be switches set ( to power nrf52840 and leds)

[Jared]

Hi,

Please read this thread.

Jared 

[gnrboy]

Hi, I tried now with the zigbee light switch example, and it works with the setup you described.

• Power through P21
• SW10 to ON
• SW6 to nRF only
• SW9 to VDD
• Plug in the USB cable (J2), to power the rest of the board
• SB40/SB41 closed

With that setup I'm able to measure current going in to P21 and still toggle the light with the buttons.

Its not burn or something else because now when only  on j2 usb connected and via this connect all board have power (sw8 = ON, SW6=default, SW9 = VDD,sb40/sb41 are short (default)) ? sw10 (vext ->nrf) default off need to change to on thaht will separate powering via j2 and P21  ?

If I want to power buttosn and leds sw6 leave to default?

EDIT: Am I right?