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Powering the ST-33Q+
Disconnect external leads from any energized utility
before opening the battery compartment. To prevent
overheating and leakage, do not mix battery types or
used and new batteries. Always remove the batteries
before shipping or storing the ST-33Q+.
The ST-33Q+ can be powered by a Li-Ion 18 V re-
chargeable battery, six D-cell batteries, or an external
10-28 VDC power source.
An 18 V rechargeable battery can be used simultaneous-
ly with the internal alkaline or NiMH D-cell batteries. Do
not mix battery types or brands, and do not combine new
and used batteries.
Li-Ion 18
V Rechargeable Battery
The ST-33Q+ can be powered from one Li-Ion 18 V re-
chargeable battery as long as the voltage remains above
14.4 V. If the voltage falls below 14.4 V or if the battery
dies, the ST-33Q+ will switch to internal batteries and
display an alert.
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D-Cell Battery Power
New alkaline D-cell batteries, with a load of 100 Ω at a
frequency of 8 kHz and a power level of 100 mA, can
power the ST-33Q+ for approximately 17.5 hours. Actual
operation life varies with battery rating and use.
Install alkaline or NiMH D-cell batteries in the ST-33Q+
by following these steps:
1. Twist battery compartment caps counterclockwise.
2. Insert three batteries into each battery compart-
ment. Ensure the positive end of each battery points
outward.
3. Replace the caps and twist clockwise to tighten.
Note: Rechargeable D-cell batteries do not recharge in
the ST-33Q+.
External Power
The ST-33Q+ can also be powered by an external
10-28 VDC no less than 35 W.
Read and follow the instructions as specified by the man-
ufacturer of the adapter before using it with the ST-33Q+.
To prevent electrical shock and damage, ensure the ex-
ternal power source is fully isolated from the ground and
power mains. Do not use a non-isolated power supply
with the ST-33Q+.
When a 10-28 VDC power source is connected, use of
the alkaline D batteries and the 18 V rechargeable battery
is discontinued and the unit draws from the 10-28 VDC
power source. The ST-33Q+ automatically powers off
when a 10-28 VDC power source is plugged in.
Ensure the adapter cord has a clear, dry path and does
not contain any potential source of damage. Use dry
hands to plug and unplug the cord.
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