3
790 Static Monitor
In our ever-changing high tech world, a company’s
reputation for providing dependable products of excellent
quality is the one constant. Attention to fine detail is the key
to ensuring that a high tech company here today will be
enjoying the rewards of tomorrow. Among the many details
of meeting these demanding specifications is the control of
electrostatic discharge (ESD).
The High Cost of Static Discharge
Static is generated all around us through simple movements,
such as walking from one workstation to another, or pulling
tape from a dispenser. A static charge builds up, causing a
discharge, often called a static shock. Even a small
discharge can measure several hundred volts and damage
microelectronic components, which can cause these
components to fail when installed in computers, cell phones
and other devices. Semi-conductor devices damaged by
static electricity can impact yield rates and product
reliability if not properly handled. However, more costly
than the damaged goods a company distributes is the
damaged reputation it suffers with its customer base. The
fact is most ESD damage can be prevented through a static
control program which emphasizes constant monitoring to
assure peak performance. To help achieve that goal of
constant vigilance, 3M is pleased to announce the
development of the 3MModel 790 Static Monitor.
Cost-effective Static Monitor
3M recognizes that while high tech companies have to act
quickly and wisely in their endeavor to establish a plan for
constant monitoring, they must do so with an eye toward the
bottom line. The 790 Monitor is a cost efficient unit that is
small, compact and versatile in its usage, and may be
mounted directly onto device handling equipment, testers,
and auto insertion equipment. An operator simply inserts a
dual conductor ground cord into one of the input jacks
located on the monitor while working on an integrated
circuit device handler. The 790 may also be mounted at
individual workstations, and at auto insertion equipment
used in contract manufacturing facilities.
Housed in static dissipative plastic, the 790 works by
measuring the voltage potential on a person referenced to
earth ground. The 790 uses a slide switch allowing the user
to select the voltage level necessary for the specific job
function being performed. For example, the 1V and 3V
levels are used for highly critical applications in disk dri ve
and wafer fabrication manufacturing, while the 6V and 9V
levels can be used for less sensitive work areas such as PCB
assembly. Included with the 790 is a mounting plate that
allows it to be permanently mounted at an ESD workstation
or directly to a device handler, tester, or auto insertion
equipment. Power is supplied to the 790 through an AC
adapter.
The 790 has two wrist strap input jacks located on its
front, which allows two operators to use one 790 monitor
unit at a workstation simultaneously. A green light indicates
that the unit is “on” and that all monitored connections are
within set limits. Two red lights and an audible alarm flash
and beep at different rates to indicate 3 separate alarm
conditions:
Exceeding voltage level set limit
Loss of contact between arm and wristband
790 disconnected from ground
These distinct alarms make it easy to identify which
operator and the type of fault condition. The audible alarm
can be adjusted to a low or high level to overcome
background noise from other equipment that may be in use
in the area. Ring terminals on the end of the 790’s ground
and chassis cords provide a permanent connection.
Product Features
Audible and visible alarms
Compact system
Pre-select test voltages 1V, 3V, 6V, & 9V
Static-dissipative plastic housing
Mounts easily to ESD worksurface
Regulatory Compliance: UL & CE
The 3M 790 Static Monitor system includes a mounting
plate with adhesive, an AC adapter, and two ground cords
with a two-wire connector.
Litho in USA.
© 3M 2001 98-0799-0490-4 (060110)XX-1
40% Pre-consumer waste paper
10% Post-consumer waste paper
Model No. Description Size
2368VM Dual Conductor Fabric Wrist Band Adjustable
2381VM Dual Conductor Metal Wrist Strap* Small
2382 VM Dual Conductor Metal Wrist Strap* Medium
2383 VM Dual Conductor Metal Wrist Strap* Large
2384VM Dual Conductor Metal Wrist Band Small
2385VM Dual Conductor Metal Wrist Band Medium
2386VM Dual Conductor Metal Wrist Band Large
2360 Dual Conductor Coil Cord 5 ft.
2370 Dual Conductor Coil Cord 10 ft.
2371 Dual Conductor Coil Cord 20 ft.
3057 Stand-By Jack ————
*Includes Band & Cord
Quality in Action
ISO requirements state the need for verification of performance
of all test equipment. A 3M790VK Verification Kit allo ws
you to meet these requirements. The kit includes hardw are
items for connection to the 790 Monitor.
790 Properties
Item Typical Properties
Monitor Size 3.5" x 4.0" x 1.25" (88,9mm x 101,6mm x 31,8mm), approximate
Power Supply Requirements:
Input 120 Vac ±10% (North America)
Outside North America (As required)
Output 25 Vdc @ 50 mA rated load
Output Plug Polarization Center negative
Output Plug Dimensions 5,5mm O.D. x 2,1mm I.D. x 9,5mm length
Accuracy: (The following parameters are valid for altitudes up to 2000 m. Pollution degree 2, Class 3, Equipment)
Voltage Detection Levels (1V ±15%) (3V,6V, & 9V ±10%)
Ground Disconnect 10 ohms ±20%
Environmental Operating Conditions:
Temperature Maximum 104°F (40°C); minimum 50°F (10°C)
Humidity Maximum 75% relative humidity
Ordering Information:
For ordering information, technical information and
product information, you can reach us at:
Phone: 1-800-328-1368
Fax: 1-800-828-9329
3
Electronic Handling & Protection Division
6801 River Place Blvd.
Austin, TX 78726-9000
http://www.3M.com/ehpd
Important Notice
All statements, technical information, and recommendations related
to 3M’s products are based on information believed to be reliable,
but the accuracy or completeness is not guaranteed. Before using
this product, you must evaluate it and determine if it is suitable for
your intended application. You assume all risks and liability
associated with such use. Any statements related to the product
which are not contained in 3M’s current publications, or any
contrary statements contained on your purchase order shall have
no force or effect unless expressly agreed upon, in writing, by an
authorized officer of 3M.
Warranty; Limited Remedy; Limited Liability.
This product will be free from defects in material and manufacture
for a period of 1 year from the date of purchase. 3M MAKES NO
OTHER WARRANTIES INCLUDING, BUT NOT LIMITED TO, ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE. If this product is defective within the
warranty period stated above, your exclusive remedy shall be, at
3M’s option, to replace or repair the 3M product or refund the
purchase price of the 3M product. Except where prohibited by
law, 3M will not be liable for any loss or damage arising from
this 3M product, whether direct, indirect, special, incidental or
consequential regardless of the legal theory asserted.
3MTM 790 Static Monitor
Required accessories and optional parts for 3M 790 Static Monitor