PRODUCT SAFETY SOLUTIONS
© 2012 Educated Design & Development, Inc. All rights reserved. Rev B: February, 2012
Page 6 of 19
PRODUCT COMPONENTS: (Continued)
A. NEUTRAL SWITCH: Controls the connection of the incoming neutral line to the product under test.
This switch allows the neutral to be disconnected as called for in some Standards. With 240 Volt
operations, this switch disconnects one side of the 240 Volt line (Line 2).
B. LINE SWITCH: Controls the connection of the incoming line and neutral conductors to the product
under test. This switch allows the line and neutral polarity to be reversed as called for in some
Standards. With 240 Volt operations, this switch swaps both sides of the 240 Volt line.
C. GROUND SWITCH: Controls the connection of the incoming ground line to the product under test.
This switch allows the grounding conductor of the product under test to be disconnected as called
for in most Standards. The red Ground Open light illuminates signaling the potential for danger that
exists when the product ground is disconnected. The momentary Ground Switch must be toggled to
“OPEN” in order to isolate the ground at the D.U.T. output receptacles.
D. METER DISPLAY: 3 1/2-digit LCD display that measures the true RMS value of leakage current.
E. POWER SWITCH: This switch controls power to the internal circuitry of the LT-952 only. When the
switch is ON, the meter display should be visible and the green Ground Closed lamp should be lit.
For safety, the LT-952 is designed to disable both the front and rear panel outlets when the power
switch is OFF.
F. D.U.T. OUTLET: Provides a convenient way to connect 120 Volt, 15 Amp products to the LT-952.
There is no need for a rear panel cord-set adapter. For safety, this outlet is disabled when the LT-
952 is set for 240 Volt operation.
G. GROUND INDICATORS: The Open Ground and Closed Ground indicators continuously display the
state of the grounding conductor to the product under test. The Open Ground indicator is colored
red to signal possible danger in that the product's safety ground has been defeated. The green
Closed Ground indicator signals that the grounding conductor to the product under test is intact.
H. METER CONNECTION BANANA JACKS: Allows external connection to the meter measurement
circuit as described under “Meter Connection Switch”
I. METER RANGE SELECTOR SWITCH: This Switch controls the sensitivity of the internal meter
circuit. The meter can be set to either 0-2 or 0-20 mA full-scale range.
J. METER SELECTOR SWITCH: Controls the connection of the meter measurement circuit to the
product under test in the following manner:
a. Surface-To-Surface - This selection connects both sides of the meter measurement circuit to the front
panel banana jacks. Leads connected to these jacks are used for measuring the leakage between any two
surfaces on the product under test.
b. Device Under Test Ground - This selection connects the device under test ground to one side of the
meter measurement circuit. The other side of the meter measurement circuit is connected to the meter
reference. The momentary Ground Switch must be toggled to “OPEN” while making measurements to