Trek 901HS User Manual

Model 901HS High Sensitivity

ESD Event Detector

! Sensitive to ESD

voltage levels as low
as 10 V at 50 mm

! Suitable for CDM

(Charge Device Model)

! Two antennas provide

high sensitivity in

Electrostatic discharge (ESD) events are important indicators of
excessive charge accumulation in environments where they may be
detrimental to manufacturing processes in the semiconductor or LCD
industries.

Trek’s Model 901HS is a diagnostic tool used to identify
incidents or verify suspected areas of ESD activity.
Electromagnetic waves, generated by electrostatic discharge,
transmit differently in different environments. In order to
accommodate these differences, the Model 901HS includes two
antennas - one active and one passive - that can be used for
detection purposes. The determination of which antenna to use
will typically be based on the environment in which it’s being
deployed and the level of detection that is required.

The active antenna may be connected directly to the Model
901HS or with an extension cable that lengthens the antenna to

1.5 meters. It provides high flexibility in positioning the antenna to
achieve the best possible reception. The active antenna can
detect ESD events as small as 10 V, at a distance of 50 mm. A
passive, monopole antenna is also provided. This antenna has a
detection capability that identifies ESD events as small as 50 V, at
a distance of 90 mm and is generally used when less sensitive
detection is required.

When an ESD event is detected, the Model 901 signals the
operator by playing an audible notification tone and by displaying
the detected event level visually via its five LED lights. Since
measurement results will vary due to the distance from the signal
source and whether there are physical obstacles present in the
environment, the LED display indicates a relative signal strength
rather than an actual signal strength. A stereo connector on the
Model 901 enables connection to an optional external display
device to display the measurement results.

detecting electrostatic
discharge events

! Five LED indicators or

an external display
indicate the detection
of ESD events

! An audible alert

indicates ESD events

! Automatic or manual

reset control

! AC or Battery

operated, compact,
and portable

Copyright Ó 2012 TREK, INC.
All specifications are subject
to change. 1202/DEC

Measurement and Power Solutions

www.trekinc.com

TM

Model 901HS Specifications

ESD Event Sensitivity Rating – Antenn a A (Active)
Voltage Level 1 Level 2 Level 3 Level 4 Level 5

10 V 50 cmm - - - ­20 V 90 mm - - - ­30 V 100 mm 50 cm - - -

50 V 160 mm 80 mm 60 mm 50 mm ­60 V 200 mm 90 mm 70 mm 60 mm 50 mm

80 V 300 mm 120 m m 80 mm 70 mm 60 mm
100 V 40 0 mm 1 20 mm 100 m m 80 mm 70 mm
150 V 50 0 mm 1 80 mm 120 m m 110 mm 100 mm
200 V 45 0 mm 2 50 mm 140 m m 120 mm 100 mm

ESD Even t Sen sitivity – Antenna P (Passive )
Vol tage Level 1 Level 2 Lev el 3 Le ve l 4 Level 5

50 V 90 mm 20 m m - - ­100 V 310 mm 80 mm 30 mm 25 mm 2 0 mm
200 V 800 mm 320 mm 22 0 mm 60 mm 4 0 mm

Features Features (cont.) General

Dimensions

Detection Levels Buzzer Main Unit:

Five (5) LEDs indicate the relative level The audible alarm that sounds when
of the ESD event an event is detected and the Buzzer

ON-OFF is in the ON position.
1st Level: Yellow
2nd Level: Yellow External Monitor Connection
3rd Level: Yellow Stereo Jack
4th Level: Red
5th Level: Red Power Supply

Power LED Lamp

Indicates that the power ON and that
the unit is operating

Universal AC-DC adapter connected to

an AC power source, or

Four (4) size AA, Lithium, 1.5V

batteries

110 mm H x 80 mm W x 45 mm D

(4.3” H x 3.1” W x 1.8” D)

Weight

500 grams (includes battery)

1.1 lb.

Power ON-OFF

A slide switch. In the ON position, the
Power LED is illuminated.

Auto Reset ON-OFF

A slide switch. In the ON Position:
Enables the unit to automatically detect
the next event within 2 sec. of being
returned to ON after a failure. Compliant
In the OFF Position: A detected event is
held until the reset switch is depressed.

Buzzer ON-OFF

A slide switch. In the ON position, an
audible alarm is sounded when an
event is detected.

Reset Button

Clears previous measurements

Model 901HSA Antenna A (Active)

Connector: sub-miniature SMA adapter

Cable: 1.5 m length antenna cable

Model 901HSP Antenna P (Passive)

Monopole type, built in SMA adapter

for connection to the Model 901HS

Operating Conditions

Temperature

10° to 40° C

Humidity

5% to 60% RH

The table below indicates the distances (in millimeters) and relative ESD voltages that will trigger
the level indicators the Model 901HS when it is used with the 901HSA or 901HSP antenna.

TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK

(fax) • www.trekinc.com • [e-mail] 716-438-7555 • 716-201-1804