TB-6502
Page 5 of 8
Revision May 2007
© 2007 DESCO INDUSTRIES INC.
Employee Owned
Figure 2, Left Side View
A relay with both “normally open” and “normally closed” contacts is included for your
convenience. The terminal block on the bottom of the tester has terminals for “normally
closed,” “common,” and “normally open” going from left to right. (See Figure 1 and 3.)
Operation
Figure 3, Front View
Upon power up, the alarm will sound and all of the LEDs for the activated tests will be “ON.”
The 50407/50413
is ready for use. (See “wrist strap option selection” below.)
Pushing the touch plate on the front panel starts the test. During the test all LEDs will be
“OFF” to indicate that a test is in progress.
The touch plate must remain depressed until
the test results are displayed
. Depending on the configuration of the tester, the test could
require up to three (3) seconds.
The resistance is checked from the touch plate to the corresponding foot plate for each foot
and from the touch plate to the wrist strap connector jacks through the operator. A wrist strap
must be plugged into the appropriate jack before the touch plate is depressed if the wrist
strap option is activated. (See “wrist strap option selection” on page 3 above.)
The 50407/50413 can test both single and dual wrist straps. Single wrist straps are plugged
into the banana jack on the front side of the tester. (See Figure 3.) Dual wrist straps are
