Performance Test
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Set the multimeter to mA/μA level, and connect the red and black probes to Pin 1 and Pin 2 of J10 respectively, to
read the static or the average current values.
When a Bluetooth chip is working, the current level may change from μA level to mA level. Therefore, the dynamic
test range of the multimeter used shall be 1 μA to 15 mA. It is recommended to use a multimeter with True RMS
current test function. Otherwise, major errors may occur in the test results.
• Oscilloscope
An oscilloscope is used to test the average current within a period of time or capture the current curve of a single
Bluetooth LE event.
As shown in Figure 10-3, solder a 10-ohm resistor to R100, and connect two oscilloscope probes to Pin 1 and Pin 2
of J10 respectively for measurement in the differential measurement mode of the oscilloscope.
When instantaneous current runs through the 10-ohm resistor, certain voltage drop occurs at the two probes. The
voltage drop is in direct proportion to current. Therefore, the oscilloscope display shows a current change curve.
You can also take average or integral values of the measured data, to analyze the current consumption within a
period of time.
Due to the wide current change range of a Bluetooth event, it is difficult to guarantee the precision of μA-level
current and reduce the impact from voltage difference of mA-level series resistor on circuit by using oscilloscope
in current testing. Therefore, the accuracy of test results cannot be guaranteed.
• Power analyzer
The two ways mentioned above (by multimeter and by oscilloscope) compromise accuracy and precision, and
therefore cannot satisfy the requirements on current consumption test of a Bluetooth LE event. A power analyzer
is a better choice, such as Keysight N6705C.
To power the GR551x SoC with a power analyzer, connect the power output port of the power analyzer to Pin 2 of
J10, as shown in Figure 10-3. During a Bluetooth LE event, the power analyzer automatically stores and displays
current curve changes for the moment. You can zoom in the curves to see current consumption details. For more
information, see operational instructions of the power analyzer.
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