5 Hardware description: Smart Remote 3 DK add-on
Doc. ID 4374_139 v1.1
Page 41
5.3.11 Current measurement
The Smart Remote 3 DK add-on has two pin headers available for current measurement. These pin headers
make it possible to measure current for the DK add-on and for the microphone.
By default, a 10 Ω resistor (R3) is parallel to P2 and a 0 Ω resistor (R5) is parallel to P9. When performing
current measurement, the resistor has to be removed.
There are two ways of measuring the current consumption: using an ampere-meter or an oscilloscope.
With ampere-meter:
• Remove R3 and/or R5
• Connect an ampere-meter between the pins of connector P2 and/or P9. This will monitor the current
directly.
With oscilloscope:
• On R3, use the default mounted 10 Ω resistor. On R5, replace the 0 Ω resistor with a resistor not larger than
10 Ω.
• Connect an oscilloscope in differential mode or similar with two probes on the pins of the P2 and/or P9
connectors.
• Measure the voltage drop. The voltage drop will be proportional to the current consumption. For example,
if a 10 Ω resistor is chosen, 10 mV equals 1 mA.
Figure 28: DK add-on current measurement
Figure 29: Microphone current measurement
In the figure above, MIC+ refers to the positive side of the microphone.
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