The best way to test power consumption is to supply the module with power separately, in case the peripheral circuit causes extra power consumption. Only VBAT/GND/SIM/RF/PWRKEY should be connected – in this case, the power consumption of VBAT will be the exact consumption of module.

To test the power consumption of the EVB board, you should:

(1) Remove the resistors R110 and R102

(2) Solder R224 with a 0Ω resistor

(3) Plug in the power adapter and turn on the 5V power switch

See below:

 

Note:

1. Removing R110 is to ensure the module is being powered directly from the external power via J103
2. The power adapter should be plugged in to supply power to the RS232 converter and LEDs, which will avoid the increase of power consumption caused by sink current.
3. The VDD_EXT of the module is used to supply power to the RS232 converter. In order to avoid the RS232 converter being supplied by VDD_EXT, R102 should be removed. Meanwhile, R224 should be soldered with a 0R resistor to supply power to the RS232 converter with a 5V power adapter.