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103 3M ™ Wrist Strap and Footwear T ester The 3M Wrist Strap and Footwear Tester 740 is an AC-powered unit designed to be wall-mounted in a production facility for daily testing of employees’ static control wrist straps.…
102
For more product information, please visit www.3M.com/static
3M
™
Surface Resistance Meter
The SCC-625 is a wide-range, multi-scale, auto-ranging meter. It
measures resistivity per ASTM D257, resistance per EOS/ESD S11.11,
and Resistance to Ground (RTG). Appropriate for auditing static control
items. Measures conductive, dissipative and insulative items. The meter
is battery powered and simple to use. High-speed electronics provide
repeatable measurements.
Useful for audit testing required by ANSI/ESD S-20.20, EIA 625,
MIL-STD-1686.
3M
™
SCC-625 Surface Resistance/Resistivity RTG Meter
Product No. Description
SRMETER
Surface Resistance/Resistivity RTG Meter
Properties
Electrical
Measurement
10
3
to 10
12
ohm/square ASTM D257
10
2
to 10
11
ohm EOS/ESD 11.11
Resolution
one order of magnitude
Accuracy
± 1/2 decade
Power
9 volt battery
Electrodes
Parallel Bar
Mechanical
Weight
6.2 oz
Size
4.5 H x 2.7 W x 1.0 in. L
(115 H x 69 W x 26 mm L)
Test Equipment
103
3M
™
Wrist Strap and Footwear Tester
The 3M Wrist Strap and Footwear Tester 740 is an AC-powered unit
designed to be wall-mounted in a production facility for daily testing of
employees’ static control wrist straps. Use of the optional 3M
™
Shoe
Electrode 741 attachment allows the tester to be used as a footwear
tester as well. The optional Shoe Electrode 741 is a test plate that
connects to the Wrist Strap and Footwear Tester 740. By standing
on the shoe electrode, personnel can use the wrist strap and footwear
tester to check the operation of static control footwear, heel straps
and the like. This electrode, constructed of rugged stainless steel in
a molded plastic base, must be ordered separately.
Simple to operate, the unit has several useful features and options. Red
and green LEDs give a clear “go” or “no go” indication. The user can
select any of four different resistance levels, making the tester a versatile
instrument to meet varying industry, corporate and global standards. The
unit tests the wrist band and cord while they are being worn, and can also
test each component independently to isolate an indicated fault. There
is also a digital output that can be used to interface with a computer,
automatic door lock, alarm or other control device.
The wrist strap and footwear tester comes with the base unit, output
connector, 3M Dual Lock
™
Wall-Mounting System and template, cover
for the wrist strap plug-in jack and the AC/DC transformer.
Note: The Shoe Electrode 741 is not included with the Wrist
Strap and Footwear Tester 740 and must be ordered separately.
3M
™
Wrist Strap and Footwear Tester 740
Wrist Strap Tester 740 Properties
Item Typical Properties
Dimensions
5.43 H x 7.48 W x 2.09 in. D
(13.8 x 19.0 x 5.3 cm)
Weight
15.75 oz. (450 gm)
Power Supply
27 Vdc transformer, 150 mA
(AC/DC adapter supplied)
6 ft. (1.8 m) wire
Test Voltage
20 Vdc, ± 1 volt (open circuit)
Resistance Ranges
Lower limit: 750K ohm
Upper Limit Wrist Strap
2, 5, 10 and 35M ohm
Upper Limit Footwear
10, 35, 50 and 100M ohm
Accuracy
+ 20%, -0% for 750K ohm lower limit
± 10% for 2M, 5M, 10M, 35M and 50M
ohm ± 20% for 100M ohm
Output
Open collector at pins 1, 2, 4 and 5
DC return at pin 6. + 5 volts at pin 3
Wall Mounting
3M
™
Dual Lock
™
System
Shoe Electrode 741 Properties
Item Typical Properties
Dimensions
20 H x 16 in. W (50.8 x 40.6 cm)
Weight
5 lbs. (2.3 kg)
Construction
1 mm stainless steel plate and molded plastic base
Other
3M adhesive strip prevents unit from sliding while in
use. Shoe electrode interconnect cord 6 ft. (1.8 m).
Surface Resistance Meter and Personnel Testers
Test Equipment
104
For more product information, please visit www.3M.com/static
3M
™
Wrist Strap Tester
The 3M Wrist Strap Tester 746 can be used to test wrist straps in a variety
of situations, from daily testing in a production facility to periodic testing
at remote sites or field service locations. This versatility allows the Wrist
Strap Tester 746 to be the standard for all applications in your company.
The tester is supplied with an AC adapter, but it also contains a long-
life lithium battery as back-up power for portable applications or during
power failures. (A “battery” light notifies the user when the battery
needs replacement.)
As with other 3M wrist strap testers, the unit is easy to use. It can test
the entire wrist strap system while it is being worn, or it can test the
individual components to isolate a fault condition.
3M
™
Wrist Strap Tester 746
3M
™
AC Adapter 746P
Wrist Strap Tester 746 Properties
Item Typical Properties
Weight
7 oz. (200 g) without battery
Power
9 V regulated 75 mA AC/DC adapter
(supplied with 746)
Battery
9 V lithium manganese (NEDA 1604LC)
(supplied with 746)
Does not contain mercury, cadmium or lead.
Test Voltage
19 V DC, ± 1 V
(open circuit)
Resistance
Ranges
Upper limit – 10 M ohm ± 10%
Lower limit – 750 K ohm +20% -0%
Wall Mounting
3M
™
Dual Lock
™
System
AC Adapter
Specifications
Input Voltage — AC 120 V
Output Voltage — DC 9 V (Regulated)
Output Current — 75 mA
Output Connector
Dimensions — 0.2 (0.D) x 0.1 (l.D) x 0.4 in (L)
[5.5 (O.D.) x 2.1 (I.D.) x 11 mm (L)]
Output Connector
Polarity — Center negative
Product No. Description
746
Wrist Strap Tester supplied with an AC adapter,
a lithium battery, and a wall mounting kit. Also
available in certified.
Size, in. (cm)
6.25 H x 3.75 W x 1.25 L (15.8 x 9.5 x 3.3)
Test Equipment
RoHS
Compliant
2002/95/EC