Hardware Reference
In-Depth Information
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
he 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 3-1).
Figure 3-1:
he two voltage
test points,
labelled TP1
and TP2
