4
NOTE:
It is recommended that the cable/strap assembly be tested alone
(Section 4.1 above) even if the cable/strap/wearer system tests good.
4.3 Using the Ground Strap Tester as a grounding point
a. Plug the ground strap into the appropriate STRAP INPUT connector. The
strap is now grounded through the third wire ground in the power cord.
b. Select the appropriate STRAP & WEARER function (ESD or ORDNANCE).
c. Periodically depress the PUSH TO TEST Button to check the integrity of the
cable/strap/wearer resistance.
d. If a FAIL indicator is activated, test the cable and/or strap as per Section 4.1
above.
4.4 Testing heel straps and conductive footwear
a. Place the STRAP SELECT selector switch in the FOOTWEAR position.
b. If the facility is equipped with a grounded conductive floor (RTG <10
5
Ohms),
simply depress the PUSH TO TEST Button to test the effectiveness of the
footwear grounding system.
c. If the location does not have a conductive floor, then a metal plate (ETS
Pt#5771, 12”x12” [305x305mm] that the user must stand on to test the
footwear is connected to the STRAP INPUT 0.162” (4mm) banana jack
located at the bottom of the unit next to the power cord as shown in Figure
4.4-1.
Figure 4.4-1: Ground plate connection
5.0 AUTOMATIC
FUNCTIONS
5.1 System
Self-Test
The Model 252C contains a FAIL-SAFE measurement system that checks the
Tester each time the TEST BUTTON is depressed. The Red FAIL indicator
MUST ALWAYS FLASH (at least for an instant) each time the Test Button is
pushed even if the cable and wrist strap being tested is good. Should the Ground
Strap Tester fail to give this indication (even if it shows a PASS indication) a
malfunction in the Tester should be suspected. DO NOT USE the Ground Strap
Tester unless it is functioning as described herein. If in doubt, contact Electro-
Tech systems, Inc. at 215-887-2196 so that repairs, if required, can be made.
6.0 SERVICE
The Model 253A Ground Strap Tester contains no user serviceable parts except
the ¼ amp 3AG fuse. The fuse should be replaced ONLY WITH AN IDENTICAL
