Hardware Reference
In-Depth Information
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.
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.
WARNING
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
