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Line Voltage Menu
• Menu Heading - “L-”
• Measurement at Menu Heading - True RMS Line Voltage
• Submenu - yes
“Hi=” - Highest Line Voltage
“Lo=” - Lowest Line Voltage
“A=” - Average Line Voltage
“P=” - Peak Line Voltage
The submenu values are the highest, lowest, average and peak values taken
since the SureTest was plugged in.
Voltage Drop Menu
• Menu Heading - “Gn-”
• Measurement at Menu Heading - % Voltage Drop under a full 15 Amp
Load
• Submenu - yes
“20=” - Voltage Drop under 20 Amp Load
The test results for the 20 Amp load test are simulated based on an actual
15 Amp load.
Ground-to-Neutral Voltage Menu
Ground-to-neutral voltage results from current flowing in the neutral con-
ductor from other equipment on the circuit. High ground-to-neutral voltage
indicates that the circuit may be loaded near its capacity or the neutral con-
ductor may be shared or carrying harmonic distortion. A reading of less
than 2 volts usually indicates a usable outlet. An excessive ground-to-neu-
tral voltage may result in inconsistent or intermittent equipment performance
This test can also be used to verify a dedicated circuit. A measurement
greater than 0.1 volts indicates that the receptacle under test is not on a
dedicated circuit.
• Menu Heading - “Gn-”
• Measurement at Menu Heading - True RMS Voltage, Ground-to-Neutral
• Submenu - yes
“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
The submenu values are the highest, lowest, average and peak values taken
since the SureTest was plugged in.
After the display is advanced to “Ld” in the submenu, it will cycle between
the load and power factor measurements. Pressing the display button will
not advance the unit through the programming sequence. After these mea-
surements are taken, the unit must be removed from the receptacle and re-
inserted.
Resistance Menu
• Menu Heading - “rES-”
• Measurement at Menu Heading - None
• Submenu - yes
“rn=” - Resistance of Neutral Conductor
“rH=” - Resistance of Hot Conductor
“rG=” - Ground Impedance
The St-1THD checks ground impedance by pulsing 15 amperes from hot-to-
ground to ensure that the resistance is less than 1 Ohm.
GFCI Menu
The ST-1D applies 6mA to ground through a fixed resistor to trip the GFCI.
A functional GFCI will disconnect the power. The reset may be at the outlet
or at the panel.
WARNING
When testing 3-wire outlets, do not proceed with the GFCI test if the
Wiring Indicator lights indicate a “No Ground” condition exists.
Repair the ground circuit first.
