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參數(shù)資料
| 型號(hào)： | 19230 |
| 廠商： | Desco |
| 文件頁(yè)數(shù)： | 2/4頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | MONITOR DUAL WORKSTATION 120V |
| 標(biāo)準(zhǔn)包裝： | 10 |
| 類型： | 接地完好性測(cè)量?jī)x |
| 使用： | 工作面（2），腕帶（2）監(jiān)視 |
| 特點(diǎn)： | 連續(xù)監(jiān)視，NIST 可追溯，單芯系統(tǒng) |
| 電源類型： | 120VAC |
| 包括： | AC 適配器，線纜，軟線，安裝五金件，遠(yuǎn)程監(jiān)視器 |
| 其它名稱： | 16-1082 |
Wave distortion technology can be referred to as "vector
impedance monitoring". This description is valid as the wave
distortion technology measures the impedance at the
monitored banana jack and looks for changes in either the
capacitance or resistance of the circuit which includes the wrist
strap and its wearer. It uses filtering and time domain sampling
to filter out false signals caused by voltage offsets, 60 Hz fields
and other electro-magnetic and electrostatic interference.
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 Dual Operator Workstation Continuous Monitor cannot be
"fooled". It will provide a reliable alarm only when the wrist
strap or work surface becomes dysfunctional or unsafe
according to accepted industry standards. The Dual Operator
Workstation 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 Dual Operator Workstation 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 more
expensive & less durable 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 times as expensive as a system utilizing single-wire wrist
straps and cords.
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 ESD events 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
microprocessor."* The dual-wire system does not meet all
industry ESD S6.1 specifications, as the cords do not meet the
EOS/ESD Association guidelines for the 1 to 5 pound
"breakaway force" requirement for ensuring a reliable path-to-
ground and preventing accidental disconnects.
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.
Installation
Confirm that worksurface(s) is 1 x 107 ohms or less. Remove
the monitor from its packaging and inspect for any shipping
damage. Included with each Dual Operator and Dual
Workstation Continuous Monitor should be:
1
120 VAC transformer
2
Work surface ground cord
2
Push and clinch snap (09863)
2
Satellite remote monitors
1
Monitor Control unit
2
7Ft. phone cables for connection to satellites
6
Mounting screws
The Model 19230 monitor control unit is normally installed
under the bench top toward the front edge of a workstation
where the LEDs are easily visible. The unit is designed to be
mounted using the mounting bracket provided. See figure 2. To
release monitor, push up on the monitor release tab.
Figure 2. Installation of mounting bracket.
Figure 3 shows the monitor as it is viewed from the front.
Figure 3. Operating the 19230 monitor.
SATELLITE REMOTE
MONITORS.
The Satellite remote
monitors can be installed
up to 7 feet away from the
monitor control unit. Two
operators plus two
worksurfaces can be monitored at separate adjacent
workstation mat circuit maybe bypassed by a switch located at
the rear of the satellite. Also shown on each satellite remote
TB-3018 Page 2 of 4
Monitor
Release Tab
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178 Fax (909) 627-7449
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Fax (781) 575-0172 Web Site: http://www.Desco.com
*1981 article by Donald E. Frank - Electrical Overstress Electronic
Discharge Symposium Proceedings
2009 DESCO INDUSTRIES INC.
Employee Owned
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 19230 010 BULK | 制造商:Belden Inc 功能描述:16-3C PORTABLE CORD , BLACK BULK |
| 19230 010250 | 功能描述:多芯電纜 16AWG 3C UNSHLD 250ft SPOOL BLACK RoHS:否 制造商:Alpha Wire 導(dǎo)體數(shù)量:3 線規(guī) - 美國(guó)線規(guī)（AWG）:16 絞合:19 x 29 屏蔽:Shielded 長(zhǎng)度:100 ft 電壓額定值:600 V 外殼材料:Polytetrafluoroethylene (PTFE) 絕緣材料:Polytetrafluoroethylene (PTFE) 類型:Communication and Control |
| 19230-0033 | 功能描述:手工工具 FEED FINGER (MMC) NEW STYLE RoHS:否 制造商:Molex 產(chǎn)品:Extraction Tools 類型: 描述/功能:Extraction tool |
| 19230-0037 | 功能描述:手工工具 K PRESS HOLD DOWN FO R MMT-100 (24853-35) RoHS:否 制造商:Molex 產(chǎn)品:Extraction Tools 類型: 描述/功能:Extraction tool |
| 19230-0038 | 功能描述:手工工具 PARTS FEED FINGER (2 ED FINGER (24854-08) RoHS:否 制造商:Molex 產(chǎn)品:Extraction Tools 類型: 描述/功能:Extraction tool |
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