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TB-6566 Page 1 of 6
Revision June 2009
© 2009 DESCO INDUSTRIES INC.
Employee Owned
Limit Comparator - Instructions for Use
TECHNICAL BULLETIN TB-6566
Made in America
Item
50421
X3 Limit Comparator
DESCRIPTION
PACKAGING
1 Limit Comparator
2 Test Leads, Banana to Banana
1 NIST Certifi cate of Calibration
OPERATION
Testing Footwear Circuit, refer to fi gure 1.
To complete the footwear test, you will need to test the
low and high limits. Refer to the dipswitch setting on the
left side of the testers for footwear test ranges.
Manufacturer’s suggested default test range is 750K
low and 35Meg high for the US and Europe.
Do not power down tester, remove stereo cable from
bottom right jack of tester labeled “FOOTPLATE” and
connect the stereo lead from model 50421 to the jack
labeled “FOOTPLATE”.
Testing Low Circuit
– If the tester’s low range is set to
750K. Set the knob
on model 50421 to
the “750K LOW”
position. Touch the
TEST contact on
the tester and you
should get a red
LED for the left and
right foot. Disre-
gard the test result
for the wrist strap,
if the wrist strap
circuit is on.
Set the knob on model 50421 to “750K Pass”, touch the
TEST contact on the tester and you should get a green
LED for the left and right of the foot.
