Test results – B&K Precision 570A - Manual User Manual

Page 8

Model 570A Linear IC Tester

 1993-2007 B&K Precision Corp.

making good contact. Press the TEST/EXEC key to activate the test
sequence for the IC. If an invalid IC type number was entered, or if
the IC you have requested is not supported the message "Unknown"
will be displayed.

Simply entering another IC type number will

automatically clear this error message. If a valid type number was
entered, the IC test will begin and the message "BUSY" will be
displayed while the test proceeds.

Many of the tests, however,

execute so quickly that this message is not noticeable.

8. test results

A pre-determined sequence of signals is applied to the inputs of the
IC under test and the output voltages are measured prior to
comparing with the correct values. The exact nature of the test
depends on the function of the IC, but as an example the
operational amplifier tests include both open and closed loop
testing over a range of input voltages and gain settings. 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.

Some ICs require external components to be fitted prior to the test -
in these cases the message EXT or CAP will be displayed at the top
right of the display.

Please refer to the IC lists at the end of this