16
15
Menu Structure for Current Probe Menu Testing (ST-1THDC Only)
Submenu
Display Menu
Display
Measurement
cA-
Current
Current
Hi=
Highest Current
Lo=
Lowest Current
A=
Average Current
ct-
% Current THD
% Current THD
Hi=
Highest Current THD
Lo=
Lowest Current THD
A=
Average Current THD
P=
Peak Current THD
cH-
Current Harmonics
h3=
%THD at 3rd Harmonic
H5=...H15=
% THD for each odd numbered
Harmonic through the 15th
Harmonic
bAL=
Total of the remaining % THD from
17th Harmonic to 31st Harmonic
Optional Accessories
#61-175 Ground Continuity Adapter
This adapter allows the operator to verify that a cabinet or equipment chas-
sis has been properly connected to the power system ground. Plugging
into the #61-175 adapter will isolate the SureTest from the power source
ground. The LED display of the ST-1THD will read “E-nG”. If the equip-
ment is properly grounded, then touching the alligator clip from the ground
continuity adapter to the cabinet or equipment chassis should return the cir-
cuit to a Normal condition.
WARNING
This is a static test and will not confirm the current carrying capacity
With the ST-1D, this adapter can be used to check the ground impedance of
a cabinet or equipment chasis. See section 3.4 for test instructions.
This adapter can also be used to test GFCI receptacles on 2-wire circuits.
Connect the ground lead on the adapter to a ground, such as a metal water
or gas pipe, prior to GFCI testing.
#61-176 Isolated Ground Adapter
This adapter allows the operator to verify that a receptacle is completely iso-
lated from the other grounds between the receptacle and the entry panel.
WARNING
The receptacle should be tested for proper grounding prior to testing
for ground insulation.
Test the ground impedance of the receptacle and make a note of the results.
See the section on outlet circuit testing for details. Remove the SureTest
from the receptacle and plug it into the #61-176 adapter. Clip the ground
wire to the metal outlet, center receptacle screw, or the metal outlet box.
Re-insert the ST-1THD into the receptacle and retest for ground impedance.
Make a note of the result.
If the two resistance readings are the same, then the receptacle is not isolat-
ed. If the receptacle is isolated, the reading with the #61-176 will be lower.
A reading of half when the adapter is used is common, because a parallel
ground path has been introduced by attaching the ground wire to the
grounding point of the receptacle.
#61-177 Extension Cord
The ST-1THD is supplied with an extension cord to make testing easier on
hard-to-reach outlets. Replacement extension cords can be purchased from
your authorized IDEAL distributor.
#61-179
CARRYING CASE
The ST-1THD is supplied with a lightweight carrying case to protect the
units and store the instruction sheet and accessories. Replacement cases
can be purchased from your authorized IDEAL distributor.
