A.W. Sperry Instruments SP-5A Mode D'emploi page 8

do not use the SP-5A or the test leads. Refer to sec.7.
6) PLACE THE SELECTOR SWITCH ON THE SP-5A into the
"X1K" position, hold the tips of the Red and black test leads togeth-
er and adjust the "OHMS adjust knob" until the meter movement
pointer reads "0" on the "OHMS" scale located at the extreme right
side of the scale plate. If a "0" reading cannot be obtained, a weak
battery is the most probable cause. Follow the battery replacement
procedure in sec. 6-1.
Note: The SP-5A is now ready for use. Follow measurements with
the selector switch in the " X1K" position. The SP-5A can be used
in all other ranges with a weak, dead or missing battery.
7) The SP-5A is now ready for use. Follow the Measurement pro-
cedures in this manual for all measurements. Read all safety
Precautions in sec.2 before proceeding.
5) OPERATION
5-1) Voltage Measurements
1) Follow the Preparation for Use procedure in sec. 4.
2) Read all Safety Precautions in sec. 2.
500 Vac/dc is maximum voltage that can be measured using
this meter. Attempting to measure higher voltages may result in
electrical shock, instrument damage and/or damage to equip-
ment under test.
3) Select an AC or DC voltage range using the selector switch that
is higher than the maximum voltage to be measured. If the maxi-
mum voltage may be higher than 500 Vac/dc, do not attempt to
CAUTION
8