Prostat PMT-872A, Руководство пользователя

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9
Rev. A / December 2006
PMT-872A Wrist Strap/Footwear Auditor
a. Make sure that you hold the cuff opposite (180 °) from the metal cuff buckle
NOTE
Do not test a wrist strap while holding the buckle as it may
give you a false PASS indicator.
b. Be sure that your thumb or fi nger makes direct contact with the inner surface of the cuff .
4. Insert the wrist strap ground cord banana into the test input jack
5. Push the “Press to Test” bu on with a fi nger. You
will no ce that the LED’s light up while a emp ng to
automa cally “range”. With an acceptable Wrist Strap
the LED light sequence will be:
a. Ini ally, the HIGH FAIL and LOW BATT. LED’s should
light briefl y.
b. The HIGH FAIL LED goes off , the PASS LED comes
on and the LOW BATT. LED remains on.
c. The PASS LED remains on and the LOW BATT. LED
goes off .
d. An audible “Beep” begins to sound when the test is completed and the Wrist Strap is
within the acceptable resistance range while being worn.
6. Once the Green PASS LED is stable and the audible BEEP begins to sound, the test is complet-
ed. It indicates the Wrist Strap from its cord connec on through the cuff assembly and your
hand is within the acceptable resistance range.
If the Green PASS LED does not come on, and either FAIL LED lights, the Wrist Strap is unac-
ceptable.
7. This test may also be performed by pushing the “Press to Test” Bu on with the inner surface
of the cuff , which eliminates the hand’s or body’s resistance from the test procedure.
D. Tes ng Dual Conductor Wrist Strap Assemblies
Dual conductor wrist straps are used in automa c wrist strap monitoring systems. In eff ect, these
unique wrist strap assemblies consist of two individual conduc ng systems each having their own
ground cord conductor, a 1 megohm resistor, and one-half of the cuff assembly. The two systems
are electrically joined together at the cuff when properly worn on a human wrist.
When in use, the monitoring system measures the total resistance through one conductor of the
system, across the wearer’s skin, and back through the second conductor. This forms a complete
circuit. When the wrist strap is improperly worn, or not func onal, a complete circuit does not ex-
ist and the monitoring system typically provides a visual and, or audible alarm.
The following procedure allows an ESD auditor to periodically check dual conductor wrist strap as-
semblies.