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Introduction
The SureTest

®

family of Circuit/distortion analyzers

identify problems common to electrical circuits and
harmonic distortion quickly, easily and accurately.
They have a patented voltage drop test, which applies a
full 15-ampere load without causing interruption to
equipment on the circuit.  This family also features 64K
of memory to store and recall up to 36 hours of testing.

Product Features
• Identifies and Locates

Loose Wire Connections
Bad Splices/Receptacles
High Resistance Grounds
False (Bootleg) Grounds
Shared Neutrals

• Verifies

Proper GFCI Operation
Dedicated Circuit Presence
Isolated Ground Presence (with the 61-176 Adapter)

• Measures 

True RMS Line Voltage 
Resistance of Hot and Neutral Conductors
Ground Impedance
% Voltage Drop by Conducting an Actual Full 15 Amp Load Test 
% Voltage Drop by Simulating a 20 Amp Load Test
GFCI Trip Time
True RMS Neutral-to-Ground Voltage 
Estimated Load on Circuit 
Line Frequency
Power Consumption Power Factor
% Total Harmonic Distortion (THD) in the Line Voltage (to the 31st 

Harmonic)

Product Features
• Measures 

% THD in the Neutral Current (to the 31st Harmonic)
True RMS Current with the 61-181 Clamp Adapter (ST-1THDC)

• Event Recording 

Captures up to 36 hours of testing
Min/Max/Avg/Peak Line Voltage
Resistance in Hot, Neutral, and Ground Conductors
Min/Max/Avg/Peak Neutral-to-Ground Voltage
% THD in the Line Voltage and Neutral Current 
% THD per Harmonic up to the 31st Harmonic
Line Frequency

General Operation
The SureTest Models ST-1THD and ST-1THDC Circuit/Distortion Analyzers
take only seconds to test each outlet and circuit under a full load.  The 
ST-1THD features two easy to use operating menus.  The Wiring Menu
gives access to measurements of line voltage, voltage drop at a full 15
amperes and 20 amperes, ground-to-neutral voltage, resistance of the hot a
neutral conductor, ground impedance.  A ground fault circuit interrupter
(GFCI) test is also performed that will disrupt the electrical supply if a func-
tional GFCI is present.  

The Wave Form Menu gives access to measurements of % line voltage total
harmonic distortion (THD), line voltage harmonics to the 31st harmonic, %
neutral current THD, neutral current harmonics to the 31st harmonic and
line frequency.  

In addition to these two programming menus, the ST-1THDC features a third
menu when used with the #61-181 Amp Clamp Adapter.  The Clamp
Adapter Menu gives access to measurements of True RMS current, THD,
and harmonics to the 31st harmonic.

For use in 3-prong (grounded) outlets, inset the ST-1THD into the recepta-
cle with the ground pin extended.  For use in 2-prong (non-grounded) out-
lets, leave the ground pin retracted.  In non-grounded (2-prong) outlets
many of the tests will be non-functional due to an absence of ground.