Raspberry Pi A, User Manual, Page: 82 / 314

P A R T I
C O N N E C T I N G T H E B O A R D
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To use the voltage test points, you’ll need a voltmeter or multimeter with direct current (DC)
voltage measuring capabilities. If your meter has multiple inputs for different voltages, use
an appropriate setting.
WARNING
Avoid touching the test probes to anything not labelled as a test point. It’s possible to bridge
the 5 V supply that comes in to the Pi to the internal 3.3 V supply, creating a short circuit which
can damage the device. Be especially careful around exposed header pins.
The two test points are small, copper-clad holes known as vias , which are connected to the
Pi’s 5 V and ground circuits. Put the positive (red) meter probe on TP1, located to the left of
the board just above a small black component called a
regulator labelled RG2 . Connect the
black (negative) meter probe to TP2, located between the copper GPIO pins and the yellow-
and-silver RCA phono connector at the top-left of the board (see Figure 4-1).
Figure 4-1:
The two voltage
test points,
labelled TP1 and
TP2, on a
Raspberry Pi
Model B
Revision 1