User Guide

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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 pre-
sent. 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 ST-
1THD 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 recepta-
cle 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 mea-
surements in a series of menu and submenu options to make navigation
through the menu structure easier.
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SureTest
®
Circuit/Harmonics Analyzer
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61-156 ST-1THD
WIRING MENU
WAVE FORM MENU
(HOLD BUTTON & INSERT)
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
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
1
2
LED Display
Display Advance Button
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2