Simpson 260 Series - Using Polarity Reversing Feature

Operation
to the instrument and possible personal injury.
4.2.7 Locate all voltage sources and accessible current paths
before making connections to circuitry.
REMEMBER: Voltage may appear unexpectedly or in
unexpected locations in faulty equip-
ment. An open bleeder resistor, for ex-
ample, may result in a capacitor retain-
ing a dangerous charge.
4.2.8 Make certain that the equipment being worked upon is
properly grounded and fuses are of the proper type and rating.
4.2.9 Check and double check switch positions and jack con-
nections before applying power to the Instrument.
4.2.10 Always remain alert for low voltage circuits which may be
floating at high voltage with respect to earth ground and for com-
posite voltages (AC + DC) such as are found in r-f amplifiers.
The floating voltage or composite voltage must not exceed the
Instruments rated maximum circuit-to-ground voltage.
4.2.11 Do not make electrical measurements where the air may
contain explosive concentrations of gas or dust such as in mines,
grain elevators, gasoline stations or in the presence of charging
batteries until determined to be safe by qualified personnel. Note
that even metallic dusts can be explosive.
4.3 POLARITY REVERSING
4.31 The function switch provides a convenient means to reverse
polarity of the internal battery to facilitate testing semiconductor
devices. The +DC and —DC positions transpose internal con-
nections to the COMMON and + jacks and therefore can also be
used to reverse polarity of external voltages and currents connected
4-3