Desco EMIT TB-6518 User manual

TB-6518 12/06 Page 1 of 4

Digital Hand-Held Static Field Meter

Operation and Maintenance

DESCO EMIT WEST - 3651 WalnutAvenue, Chino, CA 91710 • (909) 627-8178 • Fax (909) 627-7449

DESCO EMIT EAST - 90 Hudson Road, Canton, MA 02021-1407 • (781) 821-8370 • Fax (781) 575-0172 • Web Site: DescoEMIT.com

Operation

ZEROING THE METER

1. The meter needs only to be zeroed at the time you first

use the instrument. It will maintain this value until the

battery is changed.

2. Press the ON/ZERO button and release. The LCD

display is activated and LED rangefinder lights begin to

flash.

3. Ground the operator by using a wrist strap or a

footgrounding device. You can also ground the unit

directly via a ground cord. The case of the instrument is

conductive and is the reference for the measurement.

4. Face the Fieldmeter away from charged objects and

press the ON/ZERO button. Hold until the display reads

zero. The instrument may also be zeroed by pointing it

toward a known grounded surface (such as the palm of

the opposite hand) and depressing the ON/ZERO button.

Although you must be careful not to contact the recessed

sensor plate, the amount of spacing between the

instrument and the target is not critical when zeroing the

instrument.

Figure 2. Zeroing the meter.

TAKING READINGS

1. Point the sensor plate toward the target and move to a

spacing of one inch from sensor plate to target. Use the

LED rangefinder to determine this distance. The two

LEDs appear to form a stationary (not moving) circle on

the target at one inch. Note the meter reading. A source

with a negative polarity shows a minus (-) sign in the

display. A positive source will display no sign.

To hold the reading, click the HOLD/OFF button briefly.

Figure 1. 50551 Digital Static Fieldmeter

Description

The Desco EMIT 50551 is a high quality, portable non-

contacting static fieldmeter which produces consistently

accurate readings with ease and provides years of trouble-

free operation. It indicates surface voltage and polarity on

objects up to ±20kV at a spacing of one inch with an

accuracy of 5% of the displayed value. It is chopper-

stabilized for use under almost any conditions including

ionized environments. Also featured are a push-button auto-

zero and a push-button hold function. A unique flashing LED

rangefinder system provides accurate positioning of the

meter from the target.

Its accuracy is dependent upon four factors:

• Grounding of the meter via a ground cord or a grounded

operator.

• The instrument must be properly zeroed.

• The distance from the front edge of the case to the target

or surface under examination must be accurately defined.

• The target must be large relative to the measurement

distance. It should be at least 5" x 5" for true accuracy.

Inspection

Remove the fieldmeter from the carton and inspect for

damage. Included with each unit should be:

1 carrying case

1 9V alkaline battery

Made in America

TECHNICAL BULLETIN TB-6518

Employee Owned

TB-6518 Page 2 of 4

DESCO EMIT WEST - 3651 WalnutAvenue, Chino, CA 91710 • (909) 627-8178 • Fax (909) 627-7449

DESCO EMIT EAST - 90 Hudson Road, Canton, MA 02021-1407 • (781) 821-8370 • Fax (781) 575-0172 • Web Site: DescoEMIT.com

The present reading is held and the word "HOLD"

appears in the display. The rangefinder LEDs go off

during the hold period to conserve battery life. A second

brief click releases the held reading.

CAUTION: If, as you approach the target, the indicated

field strength begins to exceed 20kV at a distance

greater than 1", STOP! This implies that the target

voltage may be high enough to create an arc. Proceed

with caution.

For measurements in excess of 20kV, estimate the

distance to the target and use the following multiplying

factors:

At 4", multiply reading by 2 - 40kV range

At 6.5", multiply reading by 3 - 60kV range

At 8.5", multiply reading by 4 - 80kV range

The LED rangefinder system is calibrated at 1"

distance only.

Figure 3. Taking readings in the “HOLD” mode.

2. Repeat the above for additional measurements.

3. To turn the instrument off, press and hold the HOLD/OFF

button for more than 3 seconds.

Operating Notes:

• The case of the instrument is made of a material which is

sufficiently conductive to provide a grounding path via

the person holding the instrument or a grounded wrist

strap in contact with the case.

• The output jack accepts a standard 3/32" (2.5mm)

monaural phone plug and is provided in order that the

output of the instrument may be connected to an

oscilloscope, strip chart recorder, external meter or

other device. The output voltage at this jack is ±2 volts

for full input (20kV/in. at 1") for high impedance loads

(100 kSor greater). It has an impedance of

approximately 100S).

The shell of this jack may be used to provide a

"hard ground" connection.

• If you press the on/zero button during operation, the

meter begins the auto zero function and displays the

value. If you do not complete the auto zero operation,

the meter is not correctly zeroed.

• For extended monitoring of materials, a +9 volt power

supply (such as Radio Shack #273-1552) may be

substituted for the battery.

Measurement Accuracy

The accuracy of measurement is dependent on a stable

ground reference and the 1 inch measuring distance as

previously noted. It is also dependent on the “aspect ratio,”

relating the size of the object to be measured to the

measurement distance. This ratio should be at least 3 for

best accuracy, i.e. the object should be at least a 3 inch

square when measuring at a 1 inch distance. Accurate

measurements may be made at other measurement

distances by scaling the meter range and observing the

proper aspect ratio. For example, at a measurement

distance of 3 inches, multiply the meter reading by 3 to give

the range of 0 to 59.97kV. For accuracy, the object being

measured at this distance should be at least a 9 inch

square.

Auditing of Ionization Equipment

with the 50551

Due to its unique measuring circuit the digital fieldmeter will

accurately operate in an ionized air stream or ionized field.

Desco EMIT offers a “Portable Ionization Test Kit” (Item

#50552) designed to facilitate routine auditing and periodic

testing of ionization equipment. The test it si designed to be

used in conuunction with the 50551 meter. The meter and

test kit combination can be used to audit an ionizer's overall

performance. The highly portable test kit allows the user to

make quick and accurate balance level and neutralization

efficiency measurements. The test kit is sold separately as

item #50552. The Portable Ionization Test Kit includes a

slide-on adapter plate, a ±1000V charging unit and a

durable molded carrying case along with the Digital

Fieldmeter.

Figure 4. Auditing ionization equipment with the Digital

Fieldmeter and the Ionization Test Kit.

In order to test ionization equipment to an industry

Thousands

Hundred

Tens

Employee Owned

TB-6518 Page 3 of 4

DESCO EMIT WEST - 3651 WalnutAvenue, Chino, CA 91710 • (909) 627-8178 • Fax (909) 627-7449

DESCO EMIT EAST - 90 Hudson Road, Canton, MA 02021-1407 • (781) 821-8370 • Fax (781) 575-0172 • Web Site: DescoEMIT.com

recognized standard, we recommend the test procedure

published by the ESD Association as Standard 3.1. This

standard may be obtained from the ESD Association, 7902

Turin Road, Suite 4, Rome, NY 13440-2069, (315) 339-6937.

Maintenance

BATTERY REPLACEMENT

The unit should be off while replacing the battery. Normal

battery life is about 40 hours of use. Replace the battery

when the "BAT" indicator appears in the display above the

"HOLD" indicator position for more than an instant or

change at least once a year. Dead battery voltage is

approximately 7.2 volts.

Figure 5. Replacing batteries.

Replacement type is Eveready #216 or equivalent NEMA

1604. An alkaline type is recommended where longest

service life is important. Remove the battery when storing

the instrument for an extended period of time.

NOTE: After you change the battery you will need to re-

zero the meter.

CLEANING

If the 50551 is used in a dirty or dusty environment, it may

be necessary to clean the sensor to ensure proper

operation.

Foreign materials which may enter the aperture associated

with the input electrode can generate undesired signals,

offset or drift, thereby impairing the accuracy and utility of

the instrument. It is imperative that the area around the

aperture be kept scrupulously clean at all times. This can

best be done by proper care, handling and storage of the

instrument. Loose dust or other particulate matter may

simply be blown away with low pressure instrument grade

air.

More severe contamination may be removed by spraying or

flushing with the least practical amount of clean technical

grade isopropyl alcohol. Stand with instrument on end and

allow to dry thoroughly for several hours. Cleaning with any

solvent should NOT be done on a routine basis.

Calibration

The Desco EMIT 50551 is calibrated prior to shipment to

NIST traceable standards. Re-calibration should be

performed annually unless the instrument has been

tampered with or repaired, or more frequent calibration is

specified by company policy or by contract. Calibration of

the Digital Field Meter should only be performed by the

factory. Contact our Customer Service Department for

details.

Recommended Reading

SEMI E43-95, RECOMMENDED PRACTICE FOR

MEASURING STATIC CHARGE ON OBJECTS AND

SURFACES. Published by Semiconductor Equipment

Materials International (SEMI), Mountain View, CA, (650)

964-5111.

Specifications

Display: 3 1/2 digits, 0.4" digit height LCD

Response: <1 sec., 10% to 90% equivalent

to 5Hz output

Range: ± 0.00 to ± 19.99 kV/inch (25mm)

Accuracy: ± 5% of displayed value, ± 3 counts (LSD)

Environment: 0 - 50°C at 85% RH (non- condensing)

Output: 2.5mm phone jack/plug, ± 2 volts for full

input (2V/20kV/in.)

Battery: 9 volt, NEMA 1604, alkaline recommended

Accessories: Carrying case and technical bulletin

included

Charged Plate Adapter available as an

optional accessory for testing air ionizers

Personal HBM Test Fixture

(Requires the 50554 Charging Plate to be installed first)

The Personal HBM Test Fixture (Desco EMIT Item Number

50554) turns your model 50551 Digital Field Meter into a

Human Body Model tribo-electric charging tester. This kit

will allow you to measure electrical charges generated on

the human body while walking or moving across an

insulative or conductive surface. It has been specially

designed to measure static charges produced by walking

across substrates such as carpeting, vinyl floor tile, and

sealed concrete. It can also be used to detect charge

generation on conductive surfaces such as conductive or

dissipative floor tiles and carpeting. An ESD technician

may also use this tool to verify proper grounding between a

conductive or dissipative floor surface and a person

wearing personal grounding devices such as foot

grounders. The amount (or size) of the charge generated

will vary from one human body to another. Other factors

such as humidity, contamination between the foot and

flooring surface, as well as human body capacitance will

also affect the amount of charge generated.

Employee Owned

TB-6518 Page 4 of 4

DESCO EMIT WEST - 3651 WalnutAvenue, Chino, CA 91710 • (909) 627-8178 • Fax (909) 627-7449

DESCO EMIT EAST - 90 Hudson Road, Canton, MA 02021-1407 • (781) 821-8370 • Fax (781) 575-0172 • Web Site: DescoEMIT.com

Limited Warranty

Desco EMIT expressly warrants that for a period of five (5) years from the

date of purchase, Desco EMIT Static Field Meters will be free of defects in

material (parts) and workmanship (labor). Within the warranty period, a credit

for purchase of replacement Desco EMIT products, or, at Desco EMIT's

option, the product will be repaired or replaced free of charge. If product

credit is issued, the amount will be calculated by multiplying the unused

portion of the expected five year life times the original unit purchase price.

Call our Customer Service Department at 909-627-8178 (Chino, CA) or 781-

821-8370 (Canton, MA) for a Return Material Authorization (RMA) and proper

shipping instructions and address. Please include a copy of your original

packing slip, invoice, or other proof of date of purchase. Any unit under

warranty should be shipped prepaid to the Desco EMIT factory. Warranty

replacements will take approximately two weeks.

If your unit is out of warranty, call our Customer Service Department at 909-

627-8178 (Chino, CA) or 01892 665313 (Crowborough, U.K.) for a Return

Material Authorization (RMA) and proper shipping instructions and address.

Desco EMIT will quote repair charges necessary to bring your unit up to

factory standards.

Warranty Exclusions

THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALL OTHER

PRODUCT WARRANTIES, EXPRESSED AND IMPLIED, INCLUDING

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH

ARE SPECIFICALLY DISCLAIMED. The express warranty will not apply to defects

or damage due to accidents, neglect, misuse, alterations, operator error, or failure

to properly maintain, clean or repair products.

Limit of Liability

In no event will Desco EMIT or any seller be responsible or liable for any injury,

loss or damage, direct or consequential, arising out of the use of or the inability to

use the product. Before using, users shall determine the suitability of the product

for their intended use, and users assume all risk and liability whatsoever in

connection therewith.

Figure 6. Installing HBM Test Fixture on 50551 Digital Field

Meter

INSTALLATION AND REMOVAL

The test fixture is stored in the Survey Kit with the Digital

Field Meter installed, ready for use. Or, you may purchase

the 50553 HBM Test Fixture and 50554 Charging Plate

separately if you don’t have a Survey Kit. If the fixture

needs to be removed to allow use of the Field Meter alone,

follow steps A and B of the diagram. The ground cord is

located underneath the test fixture in the Survey Kit. To

obtain the desired result, the ground cord must be installed

onto the Field Meter and attached to a utility or common

ground point.

METHOD OF OPERATION

In order to obtain the desired test results, the meter must be

properly grounded as stated in the Installation and Removal

section. Once installed on the Field Meter, the Test Fixture

itself is isolated from the meter case and ground and should

remain that way.

Cradle the Test Fixture in the palm of your hand. Once the

meter is grounded and you are standing on the substrate to

be tested, simply walk around, shuffle your feet or raise a

foot, to determine if the combination of footwear and

substrate produces an electrical charge. If an electrical

charge is generated and induced onto the human body, the

Test Fixture will transfer that charge onto the Field Meter,

and the amount of the charge will be registered. If it is

necessary to record the amount of charge, you can save

Figure 7. Using the HBM Test Fixture to measure charges

on the body.

the result by simply pressing the Hold button on the front of

the Field Meter, and pressing the button with an insulated

object. This test can be done regardless of the type of

footwear or substrate combination. Other items in your

ESD Control Program may also be tested such as

conductive or dissipative chairs. Simply sit in the chair on

the desired substrate and move the chair back and forth to

determine if the chair and human body combination

produces and electrical charge.

B. Insert screw from

the back of 50554

HBM Test Fixture

A. Slide 50551Static

Fieldmeter down into

19448 HBM Test Fixture.

NOTE: 50554 Charging

Plate is required to use

the HBM Test Fixture.

Employee Owned

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