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Modei547A
Page 3
factory packaging. Contract packaging companies in many cities can provide dependable custom packaging on
short notice. Environmental conditions during storage and shipment should normally be limited as follows:
a.
Maximum altitude: 25,000
ft.
b.
Minimum temperature: -40°F (-40°C).
c.
Maximum temperature: +149°F (+65°C).
OPERATING CHARACTERISTICS
Three conditions must be met before the Current Tracer can properly respond to circuit stimulus:
1.
The mark on the probe's tip must be aligned along the length of the printed-circuit trace.
2.
The probe be held perpendicular to the printed-circuit trace - not at an angle.
3.
The printed-circuit trace must be conducting an alternating current, either from an internal source or,
from an external stimulus such as a Logic Pulser with a rise-time of
~200
ns.
NOTE
The voltage present on the black power supply lead (negative side of supply) is also present on the
tracer's anodized aluminum case. Do not lay the tracer on any grounded area, such as an instrument
chassis, unless the chassis is at the same potential as the black lead. Damage to the power supply
may result.
CURRENT TRACER OPERATION
Use of the Current Tracer is indicated when conventional troubleshooting reveals a low-impedance fal.lft. The
operator aligns the mark on the probe tip along the length of the printed-circuit trace at the driver and adjusts
the sensitivity control until the indicator lamp just lights. The probe is then moved along the trace or placed
directly on the terminal points of the nodes (or IC pins), while observing the indicator light. This method of
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