B&K Precision 575A - Manual - Manual (Page 10)

Model 575A Digital IC Tester
Copyright
 1992-2007 B&K Precision Corp.
Page 6
8. test results
A pre-determined sequence of signals is applied to the inputs of the
IC and the IC outputs are monitored for the correct logic levels. The
unit uses TTL or CMOS logic thresholds (depending on the selected
IC) when evaluating the response of the IC outputs.
If all the
outputs respond correctly, the result PASS will be displayed at the
top right of the display.
A scrolling message will contain the IC
function and power pin information.
If a short circuit between the power pins of the IC is detected, a
warning ‘SHT!' will appear on the top right of the display and, since
no valid test is then possible, the result will FAIL. If the IC under test
takes an excessive amount of current when power is applied, a
warning 'ICC!' will appear. Press the TEST/EXEC key to continue
with the test, or MODE/CLEAR to abandon.
Depending on the
condition of the batteries there may also be a ‘BAT!’ warning which
indicates that the batteries are incapable of supplying the current
required by the IC under test.
You can continue with the test by
pressing the TEST/EXEC key, but the unit may malfunction because
of a drop in battery voltage. To avoid this, change the batteries or
use a battery eliminator. Note that a faulty IC may demand more
operating current and therefore will quickly drain the batteries.