740 3M, 740 Datasheet - Page 24

• Manufacturer Part Number: 740
• Description: TESTER ESD WRIST STRAP
• Manufacturer: 3M
• Type: Testerr

Specifications of 740

• Features: Wall Mount
• Power Supply Type: AC Adapter
• Size: 137.92 mm x 189.99 mm x 53.09 mm
• Meter Display Type: LED
• Accuracy %: 20%
• External Height: 5.43"
• External Width: 7.48"
• External Depth: 2.09"
• Weight: 450g
• Accuracy: +/-10% For 10, 35 & 50Mohms
• Rohs Compliant: NA
• For Use With/related Products: Wrist Straps, Footwear
• Lead Free Status / RoHS Status: Vendor undefined / Vendor undefined
• Other names: 98079825257; SCP204

3M
The 3M Workstation Monitor 724 continuously monitors the resistance
of the operator and worksurface ground connections. The monitor
uses a reliable resistance method that actually includes the operator’s
skin resistance to determine if the system is operating properly. If
the operator’s resistance exceeds pre-set levels of 10 megohm or
35 megohm, or the wiring connections exceed 3.7 megohm, audible
and visible alarms are triggered. The unit will also warn of potentially
dangerous low-resistance situations. A switch allows the user to select
either a 9 V or 16 V test voltage, and 10 megohm or 35 megohm
resistance setting.
The monitor uses the light, compact dual conductor wrist strap
(purchased separately; see page 11). Dual conductors provide the
resistance circuit that is monitored, as well as grounding redundancy.
If one conductor fails, the other will still function to prevent sensitive
components from being exposed to static.
The Workstation Monitor 724 monitors a visitor to the workstation or
a second operator. In addition, the loudness of the alarm is adjustable.
A quick connect/disconnect 3M
the Workstation Monitor.
3M
Wrist Band 4700 and the 3M
Attach 3M Ground Cord 724
or AC Adapter Ground Wire
™
Workstation Monitor 724 pictured with 3M
™
Workstation Monitor
Ground Cord 724
Wire 2380
™
Worksurface
Conductive/
Dual Conductor Cord 2360 (ground cord and band not included).
Dissipative
Monitor 724
Ground
#1
Cord 2389
™
Rear
Remote Input Jack 732 comes with
™
Remote Input Jack 732, 3M
AC Adapter
Ground Wire
Worksurface
Conductive/
Dissipative
AC Adapter
#2
Remote 733
™
Dual Conductor
Worksurface
Ground Cord
Remote 732
Ground
Workstation Products
The worksurface ground resistance circuit of the 3M workstation
monitor indicates a malfunction when the ground loop resistance
exceeds 3.7 megohm. To determine if your mat is within this limit,
perform the following procedure using an ohmmeter.
Measure the resistance between the snap on the mat, where
you intend to connect the 3M
Cord 2380, and the ground point for the mat. Be sure the mat is
connected to ground.
Ground
724 Properties
Item
Dimensions
Power Supply
Test Voltage
Test Current
Upper Resistance Limits
Lower Resistance
Accuracy
Environmental Operating Conditions
Temperature
Humidity
Accessories
Product No.
724
Attach 3M Ground Cord 724
or AC Adapter Ground Wire
Worksurface
Conductive/
Dissipative
Ground
Description
Workstation Monitor complete with a quick connect/
disconnect 732 Remote Jack and mounting hardware.
Monitor 724
™
Rear
Typical Properties
6.5 H x 3.125 W x 1.375 in. L
(16.5 x 7.9 x 3.5 cm)
25 Vdc @ 50 mA minimum
9 Vdc or 16 Vdc
(Switch selectable)
Less than 3 microamps
Wrist Strap: 10 or 35 megohm
Switch selectable
Worksurface: 3.7 megohm
Wrist Strap: 1.5 megohm
Worksurface: none
± 15%
Max. 110°F (43°C)
Min. 50°F (10°C)
Max. 75% R.H.
Remote Splitter Kit 733
Stand-By Jack 3057
Monitor/Table Mat Replacement
Ground
AC
Adaptor
When not using work station
monitoring feature, connect
Cord 2380 to ground.
Remote 732
19