DESCRIPTION
3-3
3.4 Ranges
Track Resistance
There are five resistance ranges.
A low resistance generates a high tone, and a high resistance generates a low tone. On the 200 mΩ
range resistances below 15 mΩ generate a steady warble.
Use the 200 mΩ and [Ω] ranges for locating low resistance shorts. These ranges are sensitive enough for
measuring track resistance. [Ω] is approximately five times more sensitive than 200 mΩ.
Use the 2 Ω, 200 Ω and 20 KΩ ranges for general purpose resistance measurement.
To protect PCB components, the maximum voltage at the probe tips on these ranges is 60mV.
Track Current
There are three current ranges.
In the 200mA and 2A ranges the Needle Probes are used to make a non-invasive measurement of the
current flowing in a track, i.e. without breaking the circuit. This may be used to trace currents or locate
loading faults. A positive current will produce a reading on the display and a tone. A negative current
produces a zero display, no tone and the PROBES REVERSED LED will be lit.
TRACE uses the non-contact Current Trace Probe to detect the magnetic field intensity of current flowing
from the Drive Source. The reading on the LCD display is proportional to the intensity of the field and
therefore to the magnitude of the current. A tone is produced whose frequency is proportional to the
displayed amplitude (low magnetic field intensity causes low frequency tone).
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