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| 型號(hào)： | 19228 |
| 廠商： | Desco |
| 文件頁數(shù)： | 2/5頁 |
| 文件大小： | 0K |
| 描述： | MONITOR CONT MULTI-MOUNT |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 工作站監(jiān)視器 |
| 使用： | 工作面，腕帶監(jiān)視 |
| 特點(diǎn)： | 連續(xù)監(jiān)視，NIST 可追溯，停放按扣，單芯系統(tǒng) |
| 電源類型： | AC 適配器 |
| 包括： | AC 適配器，證書，軟線，五金件 |
| 其它名稱： | 16-1163 |
In normal factory environments, and with persons whose
capacitance with respect to ground is within design limits
(5 feet tall 90 pound person to 6 foot 5 inch 250 pound
person), the Multi-Mount Continuous Monitor cannot be
“fooled”. It will provide a reliable alarm only when the
wrist strap becomes dysfunctional or unsafe according to
accepted industry standards. The Multi-Mount Continuous
Monitor is drift-free and designed to be insensitive to the
effects of squeezing or stretching the coil cord.
ADVANTAGES OF WAVE DISTORTION AND
SINGLE-WIRE TECHNOLOGY
The Desco Multi-Mount Continuous Monitor allows the use
of any standard, single-wire wrist strap and coil cord. The
monitor/wrist strap/cord system life-cycle costs are by far
lower than alternative systems which require expensive &
fragile dual-wire cords and special wrist straps. Dual-wire
cords are expensive and are the weak link of the system,
the most likely component to need replacement. Over a
five year period, this can make the dual-wire system three
to five times as expensive as a system utilizing single-wire
wrist straps and cords. See Maintenance and Calibration
The dictionary defines constant as uniform and unchanging,
and continuous as uninterrupted. Nonetheless, some
dual-wire resistance monitors utilize a pulsed test current
and do not really provide continuous monitoring. For
example, during each 2.2 second pulse cycle of a leading
“constant” resistive monitor, electrical current is pulsed for
only 0.2 seconds followed by an unmonitored interval of
2 seconds. This leaves the user/wrist strap unmonitored
for over 90% of each cycle. Damaging static charges can
easily occur in the portion of the time in between the pulses.
The off period of 2 seconds equals 2 billion nanoseconds,
and “it takes only about 25 volts applied for 100
nanoseconds to blow most memories or microprocessors.*
The dual-wire system does not reliably meet all industry
specifications, as the cords do not meet the EOS/ESD
S-1.0 paragraph 4.1.6, 1 to 5 pound “breakaway force”
requirement for operator safety.
By using the reliable wave distortion technology to
determine if the circuit is complete, there are no false
alarms. There is no need to adjust or tune the monitor to
a specific user or installation. The miniscule amount of
electrical current (less than 1 volt coil cord signal) required
to generate the waveform has never caused reported skin
irritation and is extremely safe for use in voltage sensitive
applications such as disk drive manufacturing.
WORKSURFACE CHANNEL
The Multi-Mount Continuous Monitor’s circuitry is
sufficiently sensitive to detect extremely low current,
allowing it to be used with mats having a resistance
of up to 1.0 x 107 ohms Rtg. When the Monitor is
connected to an ESD Mat worksurface, the amount of
current that flows is a function of the total resistance
between the monitor and through the worksurface to
ground. When the resistance of the worksurface is
below a pre-set threshold, the monitor will indicate
good. Conversely, if the resistance level is high when
compared to the monitor’s reference, the unit will
alarm. This is an integrating resistance measuring
circuit, therefore it is relatively insensitive to externally
induced electromagnetic fields. The resistance
threshold is factory set to 10 megohms. (It can be
special ordered to other limits. Limits can be varied
and set to 100 megohms maximum).
Packaging
1 Multi-Mount Monitor
1 24VAC Power Adapter
1 Elastic Wrist Strap (19229, 19236 only)
1 6' Mat Monitor Cord (Black)
1 6' Mat Ground Cord (Green and Yellow)
2 Push and Clinch Snaps
2 Mounting screws
2 Countersink Washers
1 Set of hook and loop fasteners
1 Certificate of Calibration
Features and Components
TB-3054 Page 2 of 5
*1981 article by Donald E. Frank - Electrical Overstress / Electronic
Discharge Symposium Proceedings
2014 DESCO INDUSTRIES INC.
Employee Owned
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Website: Desco.com
A
B
E
D
C
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G
F
Figure 2. Multi-Mount Continuous Monitor features and
components
A. Status LEDs: When the green LED is illuminated,
the operator is properly grounded. When the red LED is
illuminated, the operator is not properly grounded.
B. Monitored Operator Jack: Where the operator inserts
the wrist cord banana plug.
C. Worksurface Ground LEDs: When the green LED
is illuminated, the worksurface mat is properly grounded.
When the red LED is illuminated, the worksurface mat is not
properly grounded.
D. Operator Ground LEDs: When the green LED is
illuminated, the operator is properly grounded. When
the red LED is illuminated, the operator is not properly
grounded.
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