PRODUCT SAFETY SOLUTIONS
© 2012 Educated Design & Development, Inc. All rights reserved. Rev B: February, 2012 Page 15 of 19
TROUBLESHOOTING:
This chapter contains answers to the most frequent questions or problems that may be encountered during
the use of the LT-952. Please read this section in its entirety before contacting E.D.&D. for assistance.
Problem: The meter fuse blows.
Solution: Confirm that the fuse being used is the correct type and rating as indicated in the Maintenance
Section of this Manual.
Solution: The device under test is inadvertently grounded through another connecting cable. This happens
frequently when testing computers. The extra ground can come from a monitor or other cord connected
peripheral. To avoid another blown fuse, verify that there are no extra grounds by measuring with an
ohmmeter before trying to measure leakage.
Solution: The device under test is connected to earth ground through the mounting means or from
connection to a grounded water pipe. This can be the case when testing stationary cord connected
equipment. If this is the case, please refer to “Field Testing Grounded Products”, chapter 2.
Solution: Do not change test conditions while holding the Ground switch in the OPEN position. This causes
momentary transients that will blow the fuse. Depress the Ground switch only long enough to take a
measurement.
Problem: The front panel AC receptacle is dead.
Solution: The front panel receptacle is designed to be disabled whenever the LT-952 is connected to a 240
Volt source. Check the position of the rear panel Voltage Selector switch.
Solution: The rear panel circuit breaker has tripped due to an overload. Reset the circuit breaker. Verify
that the input current to the device under test does no exceed 20 Amps when using the front panel
receptacle.
Solution: The Neutral Switch is set to OPEN
Problem The meter on the LT-952 indicates a single "1" with the remaining 3 digits blanked.
Solution: This indicates an over range condition. Switch to the higher 20mA range. If already on the 20mA
range, the product under test has excessively high leakage or there is a ground path from the device under
test (possibly via an accessory cable).
Problem The meter display is blank and the Ground Closed indicator does not light when the LT-952
is turned on.
Solution: Check to make sure that the LT-952 is receiving power and that the Voltage Selector switch is in
the proper position. Check the Line Fuse on the LT-952.
Problem The Line fuse on the LT-952 blows.
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