10
to sustain flash-over arcs, is a serious hazard.
1. Do not hold the instrument when working in circuits that might contain a
shock hazard.
2. Inspect the test leads, probes, connectors, and insulating boots for dam-
age or deterioration before each use. If defects are found, replace the
leads immediately with leads designed for the Instrument. Do not use
test leads inferior to those furnished with the Instrument.
3. Never disconnect the COMMON lead from an active circuit while the other
lead is connected to an energized circuit. The COMMON lead becomes
unexpectedly “hot” in such a case and can be a shock hazard. Develop
safe habits by always turning off power to the measured circuit and dis-
charging any capacitors before handling the test leads.
4. Become familiar with the circuit to be measured and locate any shock
hazards before attempting measurements. Remember that high voltages
might appear unexpectedly in a faulty circuit.
5. Measuring electricity is particularly hazardous in the presence of humid-
ity or moisture. Hands, shoes, floor and workbench must be dry.
6. Avoid measuring in circuits where composite voltages can exceed the
Instrument’s safe limits. When measuring DC voltages, the Instrument
will not respond to (and thereby not indicate) the presence of AC compo-
nents.
7. Be alert for corona in the measured circuit. Signs of corona include a
buzzing sound, ozone odor and a pale blue emanation. Its presence in-
dicates high voltage; an unexpected or unknown path might lead to a
flash-over.
8. Do not work alone when measuring where a shock hazard can exist.
Notify someone nearby of your intentions.
9. Do not connect the Instrument to an electrically energized circuit in a
hazardous area. Do not use the Instrument to check electrical “blasting”
circuits.
10. No general purpose VOM is to be used to make electrical measurements
on blasting circuits or blasting caps. Use VOMs designed for this pur-
pose only.
4.2
Zero
Adjustment
Before measuring, check to see that the pointer indicates zero when the In-
strument is in the operating position. If the pointer is off zero, make the re-
quired correction by turning the screw located directly below the “Simpson
160” legend.
4.3
Meas
u
r
ing
DC
Vol
ta
g
es
,
250
M
illi
v
ol
t
Ra
nge
Use care when making measurements with the 160 on the 250 mV range. An
excessive voltage applied when in this range can damage the Instrument.
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