Prostat PED-718, Руководство пользователя

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A. Descrip on
The PED-718 ESD Event Detector is an easy-to-use hand-held device that is designed to detect and count
ESD events that can damage sensi ve components and cause tool lockups, erra c behavior and paramet-
ric errors.
B. Event Counter
A four-digit display counts the number of events equal to or exceeding the threshold. To reset the counter,
press the actuator of the “Set” side switch inwards. The counter is also reset when the power is turned
o
ff .
C. Noise Filter
In a typical industrial environment there are many sources that produce signals similar to those of ESD
events. Such signals may include relays, solenoids, stepper motors or similar devices. In order to separate
ESD events from non-related EMI (electromagne c interference) events, the PED-718 ESD Event Detec-
tor employs a
fi lter that separates waveforms of the signals and rejects the ones that are di ff erent from a
“classic” shape of an ESD event. First, try to use the PED-718 ESD Event Detector with Noise Filter switch
turned o
ff . This allows you to assess the complete environment. If you observe extraneous events, then
turn the Noise Filter switch on.
The PED-718 ESD Event Detector detects most ESD events by the speci fi c electromagne c signature these
events produce. Therefore, the performance of the PED-718 ESD Event Detector must be looked at in view
of wave propaga on. Just like with a microphone, the farther away from the source of the signal you are,
the weaker the signal will be. When searching for the sources of ESD events, it is advisable to get as close
as is prac cal, considering necessary safety precau ons, to the suspected sources. In a typical tool, such
as an IC handler or a pick-and-place SMT machine, such sources of ESD events may include places of IC
pick-up and IC placement on any conduc ve or even dissipa ve surface. When working with the automat-
ed equipment, always observe safety precau ons as recommended by equipment manufacturer and your
company’s prac ces.
D. General Opera on
When the PED-718 ESD Event Detector is turned on, it is ready to detect, count and measure most ESD
events.
E. Bar Graph Display
The 10-LED bar graph shows the rela ve strength of most ESD events. If an ESD event does not exceed the
set alarm level, LEDs indica ng its strength are green. Whenever the strength of an event exceeds the set
threshold, LEDs turn red.
Event strength is a factor of many variables:
• The accumulated sta c voltage
• The capacitance of the charged objects (a larger object holds more charge than a smaller one)
• The physical size of discharging objects
• The environment
• The distance from ESD event occurrence
Therefore, one should exercise good judgement in comparing the strength of ESD events captured under
di
ff erent condi ons.
F. Threshold Adjustment
The PED-718 ESD Event Detector can detect ESD events in a wide dynamic range. For most applica ons,
only the events that exceed certain strengths are of importance. Threshold se ng in the PED-718 ESD
Event Detector is cri cal in iden fying only ESD events of the strength equal or above the level of impor-
tance to you.
4
Rev. A / April 2019
PED-718 ESD Event Detector