Specifications

3-14 Connections TOS9220/9221
• The test voltage applied to channels set to HIGH leaks into the output terminals of
a channel that has been set to OPEN on the tester proper through stray capaci-
tances within the scanner. Moreover, if test leadwires have been connected to a
channel set to OPEN, the voltage also leaks to its output terminals through stray
capacitance between the test leadwires.
To prevent the unintentional application of voltage to a test point by this leakage
voltage, do not connect test leadwires to the output terminals of a channel set to
OPEN. However, for tests conducted by switching voltage application points in
turn with the test leadwires connected to multiple test points, such unintentional
voltage application can be prevented by setting channels not involved in a test to
LOW.
• To clearly indicate the correspondence between the connected test leadwires and
channels, attach the supplied channel indication seals to the test leadwires.
NOTE