test. Damage will result from any external volt-
ages which are applied to the ohms circuit of the
TS-352B/U.
b. If the equipment contains transistors, and
does not have an isolation transformer in its
power supply circuit, connect one in the power in-
put circuit. A suitable transformer is identified
by National stock No. 5950-00-256-1779.
c. Make connections carefully so that shorts
will not be caused by exposed test prod or clip
connections. Tape or sleeve (spaghetti) test prods
or clips to leave a little exposed as needed to
make contact to the circuit under test.
measurements on transistorized equipment, use
the RX100 range only. The negative lead of the
ohmmeter circuit is connected to the positive side
of the battery. The equipment battery (or its
equivalent) is recommended as the source of
power when servicing transistorized equipment.
Observe battery polarity. Polarity reversal may
damage the transistors or electrolytic capacitors
in the circuit. If a battery eliminator is used in
place of the battery, it must have good voltage
regulation and low ac ripple. Good regulation is
important because the output voltage of a battery
eliminator with poor regulation may exceed the
maximum voltage rating of the transistors in the
equipment being tested. A battery eliminator
with poor ac filtering will create a false indication
2-14
