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#61-152
#61-153
SureTest
®
Model ST 1D Instructions
Introduction
The SureTest
®
family of circuit analyzers identify
problems common to electrical circuits 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.
Product Features
• Identifies and Locates
Loose Wire Connections
Bad Splices/Receptacles
High Resistance Grounds
False (Bootleg) Grounds
Shared Neutrals
• Verifies
Proper Wiring in 3-Wire Receptacles
Proper GFCI Operation
Dedicated Circuit Presence
Isolated Ground Presence (with the 61-176 Isolated Ground Adapter)
• Measures
Line Voltage
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
Neutral-to-Ground Voltage
Estimated Load on Circuit
General Operation
The SureTest
®
Model ST-1D Circuit Analyzer takes only seconds to test each
outlet and circuit under a full load. The ST-1D indicates proper wiring, volt-
age drop and line voltage in an easy pass/fail format. A simple program-
ming menu gives access to measurements of line voltage, voltage drop at a
full 15 amperes and 20 amperes, ground-to-neutral voltage, estimated load
on the circuit and ground impedance. The ground fault circuit interrupter
(GFCI) test is performed separately and will disrupt the electrical supply if a
functional GFCI is present.
Any discrepancies from a normal reading indicates that a problem
has been detected in the circuit.
For use in 3-prong (grounded) outlets, inset the ST-1D into the receptacle
with the ground pin extended. For use in 2-prong (non-grounded) outlets,
leave the ground pin retracted. Non-grounded (2-prong) outlets will be
tested for voltage drop and line voltage only.
WARNING
Do not use on outputs from UPS systems, light dimmers or square
wave generating equipment.
Insert the unit in the receptacle, observe test results, remove and reinsert the
unit while pressing the test button to perform the ground impedance test,
and then move on to the next receptacle. Allow at least 20 seconds
between insertions. Repeatedly inserting the SureTest into a receptacle will
exceed its ability to dissipate heat within the unit, resulting in fluctuating
readings or damage to the unit.
False Ground Indication
Sometimes 2-wire receptacles are replaced with 3-wire receptacles to
accommodate 3-wire plugs. A short placed between ground and neutral on
the back of the receptacle will test and appear to be a normal 3-wire circuit.
Common receptacle testers will test this configuration as a normal 3-wire
outlet.
Display of "FG" on the LED display on power-up indicates a suspected false
ground. False ground is defined as a short between the ground and neutral
wires very close to the receptacle. A false ground may also be indicated if
the receptacle is within 15 feet of the neutral-ground bonding point at the
panel, or if conduit is being used as the ground conductor.
