Ideal ND2292 User Manual

2

#61-156
#61-157
#61-158

SureTest®Model ST-1TH D & ST-1THDC
Instructions

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 func­tional 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.

Any discrepancies from a normal reading indicate that a problem has been
detected in the circuit.

For use in 3-prong (grounded) outlets, inset the ST-1THD into the recepta­cle with the ground pin extended. For use in 2-prong (non-grounded) out­lets, 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.

4

WARNING

Do not use on outputs from UPS systems, light dimmers or square
wave generating equipment.

Insert the unit into the receptacle; observe test results 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.

Wiring Verification

The St-1THD will test the wiring of a receptacle to identify if errors are pre­sent. Error messages will be displayed for polarity reversal, no ground, and
false ground conditions.

“E_rP” on the LED display indicates that the hot and neutral wires are
reversed.

“E_nG” on the LED display indicates that no ground is present. The ST­1THD will not perform any of the tests involving the ground circuit if a no
ground condition is detected.

“E_FG” on the LED display indicates a false ground condition. 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.

Specifications

Case Construction: GE Cycolac plastic molded
Operating Range:
All measurements except
voltage drop, FG, drop, FG,
conductor resistances: 80-300 Volts AC @ 50-60 Hz
Voltage drop, False
Ground & Conductor
Resistances: 80-150 Volts
Harmonic Display: Odd, 3 - 15 + Bal. To 31
All Measurements: True R.M.S.

Specifications (continued)

Crest Factor: Peak / True R.M.S.
Memory Hold/Recall: 36 Hours
Power Use: 2 Watts continuous, 1800 W peak
Digital Display: Seven segment L.E.D., 3”
Accuracy, Display: 1% of full scale +/- 1 digit
Operating Temp: 0º C to 50º C
Storage Temp: -20º C to +65º C
Dimensions: 7” X 3” X 1.5”
Weight: 7 ounces
#61-181 Amp Clamp
Adapter: 3 to 500 Amps, Jaw opening -1.3 inches

Test Procedures

The programming menus feature a simple single button operation to
advance between various measurements. The programming set the mea­surements in a series of menu and submenu options to make navigation
through the menu structure easier.

3

®

1

2

LED Display
Display Advance Button

1
2

SureTest

Circuit/Harmonics Analyzer

L

P

A

S

I

Y

D

A

E

D

C

V

N

A

61-156 ST-1THD

WIRING MENU

L = Line Volts (True RMS)
15 = % Volt Drop 15 Amp.
Gn = Volts Ground - Neutral (True RMS)
rES = Ohms Resistance
GFCI = Exact Trip Point
rCL = Recall Memory

WAVE FORM MENU

(HOLD BUTTON & INSERT)
LT = Line Voltage % THD
LH = Line Harmonics %
nT = Neutral Current % THD
nH = Neutral Harmonic %
F = Line Frequency
rCL = Recall Memory

Press Button for 3 Seconds to Access Sub Menu

65

Menu Structure for Outlet Circuit Testing

Submenu

Display Menu Display Measurement

L- Line Voltage True RMS Line Voltage

Hi= Highest Line Voltage
Lo= Lowest Line Voltage
A= Average Line Voltage
P= Peak Line Voltage

15= Voltage Drop % Voltage Drop at 15 Ampere Load

20= % Voltage Drop at 20 Ampere Load

Gn= Ground-to-Neutral Voltage TRMS Ground-to-Neutral Voltage

Hi= Highest Ground-to-Neutral Voltage
Lo= Lowest Ground-to-Neutral Voltage
A= Average Ground-to-Neutral Voltage
P= Peak Ground-to-Neutral Voltage
ELL= Estimated Load on Circuit
Ld= Load (Watts)
PF= Power Factor of Load

rES= Resistance

rn= Neutral Conductor Resistance
rH= Hot Conductor Resistance
rG= Ground Impedance

GFCI= GFCI Trip time

Countdown
of Trip Time Testing GFCI Time to Trip

rCL= Recall Memory

Blinking rCL SureTest is Recording Data
Sto Recording Completed

Outlet Circuit Testing

Unless a wiring error exists, the ST-1THD will show "Out" in the LED dis­play. This indicates that the unit is calibrating itself prior to testing. After
this calibration is performed, the ST-1THD automatically enters into the out­let circuit testing programming menu. The LED display cycles between the
menu heading, and the measurement every four seconds. Press and hold
the display advance button for one second to move to the menu. To enter
the submenu, press the display advance button for three seconds. To navi­gate from measurement to measurement within the submenu, press the dis­play advance button. While in the submenu, pressing and holding the dis­play advance button for three seconds brings the unit back to the menu
structure.

1. Insert the ST-1THD into the receptacle

2. The LED display shows “Out” indicating self-calibration of the unit

3. The LED display cycles between “L_”, indicating that True RMS Line
Voltage is being measured, and the Line Voltage measurement every four
seconds.

4. Press and hold the display advance button for three seconds to access
the Line Voltage submenu.

5. The LED display alternates between “Hi”, indicating that the highest line
voltage is being measured, and the measurement every four seconds

6. Press the display advance button for one second to move to the next test
within the Line Voltage submenu.

7. Press and hold the display advance button for three seconds to return to
the main menu.