ASV 3270, User Manual

Page: 6 / 12

Detailed Operation
Mode 1
Voltage Test Mode
Connect the black lead to ground and the red lead to a wire you
want to test for the presence of voltage.
If the voltage on the red lead is between approximately 11 and
16 volts, LED
A will light, indicating a nominal 12V. If the wire is
between approximately 16 and 28 volts LED B will light,
indicating a nominal 24V.
To find a wire with ground on it, connect the red lead to a known
source or 12V (or 24V) and probe the wire of interest with the
black lead.
CAUTION: In order to minimise the risk of damage to the
electronic equipment found in modern cars, the ASV 3270's
input impedance in voltage test mode is quite high
(approximately 48000 Ohms).
This means the installer needs to be aware that reading a
voltage (or ground) does not give any indication whether the
wire can carry any current or not.
6