SCS 746 User Manual

USER GUIDE TB-9025
746 Wrist Strap Tester
Operation and Maintenance
Figure 1. 746 Wrist Strap Tester.

Description

The design of the 746 Wrist Strap Tester allows for
testing of wrist straps while being worn by a person or
testing of the individual wrist strap components. The 746
Wrist Strap Tester can be mounted to a wall or used as
a portable piece of test equipment. It operates from a
120VAC source through an AC adapter, or a standard 9
volt battery. An internally set resistance range extends
from 750 Kilohms to 10 megohms . If the wrist strap
resistance when tested is within this range, a green
LED will illuminate. If outside this range, a red LED will
illuminate.
Wrist straps are the primary method used to minimize
charge generation on the human body. They must be
able to drain this charge as rapidly as it is generated.
For this reason, it is important to test wrist straps on a
regular basis to ensure they are functioning properly.
The test results should be recorded. The form on page 3
of this user's guide can be used as a logbook.

Specifications

Base Unit
Weight
AC/DC Adapter
Accuracy
Measurement Voltage

Installation

The paragraph numbers below are referenced in Figure
2.
TB-9025 Page 1 of 3
July 2015
3.75" W x 1.5" H x 6.25" L
(95 mm W x 38 mm H x 158
mm L)
7.5 oz. (213g) without battery
9VDC regulated 75mA
± 10% (10 megohms limit)
± 20%-0% (750 kilohms limit)
14VDC ± 1VDC (open circuit)
SCS - 926 JR Industrial Drive, Sanford, NC 27332 • (919) 718-0000 • Website:

Power Sources

FIgure 2. 746 Wrist Strap Tester installation diagram.
1A. 9 volt backup battery - To correctly install the
battery, follow these instructions:
Attach the battery snap connector to the battery. Place
the battery into the compartment, locating the snap
connector at the opposite end of the compartment
from where the battery wires come through the
housing, keeping the wires along the top edge of the
compartment. Run the battery wires along the side of the
battery and tuck them down between the housing and
the battery so that the wires clear the cover. Use a small,
straight blade screwdriver to gently push the battery
wires down below the lip of the compartment. Slide and
lock the cover into place. When changing the battery, the
battery cover must be removed carefully. To remove the
battery cover, slide back the cover slightly. Insert a small,
straight blade screwdriver into the opening immediately
over the tab area beneath the word "OPEN." Press down
with the screwdriver while sliding the cover off. You must
use a screwdriver to remove the battery cover.
1B. AC/DC Adapter
Connect the AC/DC adapter to the jack at the base of
the unit. Plug the adapter into a 120VAC outlet.
Caution: If the AC/DC adapter is plugged into the 746
Wrist Strap Tester, it must also be plugged into the wall
outlet to allow the unit to function. If the 746 Wrist Strap
Tester is to be powered with battery only, the AC/DC
adapter MUST be disconnected from the DC input jack
(1B) on the tester.
2. Battery Indicator
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