Monroe Electronics 268A Manuel utilisateur

Operator’s Manual

Monroe Electronics, Inc.

Model 268A

Charge Plate Analyzer

P/N 0340097

288B-1/100

08312016

100 Housel Ave PO Box 535 Lyndonville NY 14098 1-800-821-6001585-765-2254 fax: 585-765-9330 monroe-electronics.com

TABLE OF CONTENTS

Section 1

Warranty Return Policy

Section 2

Specifications

Section 3

General Information Operation

Section 4

Maintenance

APPENDIX I

Variable Timer Trip Point Option

...............................APPENDIX II

Application Note APNE-0017

Plate Self Decay of Charged Plate Monitors

Section 1

WARRANTY

Monroe Electronics, Inc., warrants to the Owners, this instrument to be free from defects

in material and workmanship for a period of two years after shipment from the factory.

This warranty is applicable to the original purchaser only.

Liability under this warranty is limited to service, adjustment or replacement of defective

parts (other than tubes, fuses or batteries) on any instrument or sub-assembly returned

to the factory for this purpose, transportation prepaid.

This warranty does not apply to instruments or sub-assemblies subjected to abuse,

abnormal operating conditions, or unauthorized repair or modification.

Since Monroe Electronics, Inc. has no control over conditions of use, no warranty is

made or implied as to the suitability of our product for the customer’s intended use.

THIS WARRANTY SET FORTH IN THIS ARTICLE IS EXCLUSIVE AND IN LIEU OF

ALL OTHER WARRANTIES AND REPRESENTATIONS, EXPRESS, IMPLIED OR

STATUTORY INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS. Except for obligations expressly undertaken by

Monroe Electronics, in this Warranty, Owner hereby waives and releases all rights,

claims and remedies with respect to any and all guarantees, express, implied, or

statutory (including without limitation, the implied warranties of merchantability and

fitness), and including but without being limited to any obligation of Monroe Electronics

with respect to incidental or consequential damages, or damages for loss of use. No

agreement or understanding varying or extending the warranty will be binding upon

Monroe Electronics unless in writing signed by a duly authorized representative of

Monroe Electronics.

In the event of a breach of the foregoing warranty, the liability of Monroe Electronics

shall be limited to repairing or replacing the non-conforming goods and/or defective

work, and in accordance with the foregoing, Monroe Electronics shall not be liable for

any other damages, either direct or consequential.

RETURN POLICIES AND FACTORY REPAIR

PROCEDURES

Return authorization is required for factory repair work. Material being returned to the

factory for repair must have a Return Material Authorization number. To obtain an RMA

number, call 585-765-2254 and ask for Customer Service.

Material returned to the factory for warranty repair should be accompanied by a copy of

a dated invoice or bill of sale, which serves as a proof of purchase for the material.

Serial numbers, date codes and tamper proof stickers on our products also serve to

determine warranty status. Removal of these labels or tags may result in voiding a

product’s warranty.

Repairs will be returned promptly. Repairs are normally returned to the customer by

UPS within 10 to 15 working days after receipt by Monroe Electronics, Inc. Return (to

the customer) UPS charges will be paid by Monroe Electronics on warranty work.

Return (to the customer) UPS charges will be prepaid and added to invoice for out-of-

warranty repair work.

RETURN OF REPAIRED ITEMS:

Factory repairs will be returned to the customer by the customer’s choice of FedEx, DHL

or UPS. Warranty repairs will be returned via UPS ground. The customer may request

accelerated shipping via the previous mentioned carriers for both warranty and non-

warranty repairs. NOTE: Accelerated transportation expenses for all factory repairs will

always be at the expense of the customer despite the warranty status of the equipment.

FACTORY REPAIRS TO MODIFIED EQUIPMENT:

Material returned to the factory for repair that has been modified will not be tested unless

the nature and purpose of the modification is understood by us and does not render the

equipment untestable at our repair facility. We will reserve the right to deny service to

any modified equipment returned to the factory for repair regardless of the warranty

status of the equipment.

Section 2

SPECIFICATIONS

CHARGED PLATE/PROBE ASSEMBLY:

■Designed to EOS/ESD Association standard

■Standard tripod mount

■Dimensions: 6" X 6"

■Capacitance: Total discharge test circuit with plate 20 picofarads, ±2 pf

■Plate self-discharge: Less than 10% of set voltage within 5 minutes below 50% RH

at 25°C

POWER SUPPLY:

±6000 volts maximum output; ±1000 volts/±5000 volts charging of isolated plate

available, adjustable from 1100 to >5000 volts

ELECTROSTATIC FIELDMETER:

RANGE: 0 to ±7500 volts; 0 to ±2000 volts—switch selectable

ACCURACY: Better than 2%

DRIFT: < 0.4% per hour non-cumulative after 10 minutes stabilization, typical

SPEED OF RESPONSE: Less than 100ms for 10% to 90% of full scale either range

OUTPUT: Divide input by 1000, impedance 100Q

TIMER: Full scale 999.9 sec. (>16 min.), 0.1 sec. Resolution

POWER REQUIREMENTS:

117 or 220 volts ±10% (factory preset), 50/60 Hz, 5 watts

SIZE AND WEIGHT:

Height 6", Width 6", Depth 9"; (17 x 17 x 24 cm, 2.3kg)

Weight 5.5 lbs.

Section 3

GENERAL INFORMATION

The Charged Plate Analyzer Model 268A separates into two components connected by

a ten-foot cable. The top part with the plate attached contains the fieldmeter portion of

the instrument and may be placed at the measurement site. The bottom part with the

controls and indicators may be placed in a convenient operating location remote from

the detector. To separate the two components, release the two over-center latches near

the rear of the unit and lift up at the rear of the top section.

A 1/4-20-threaded receptacle is provided inside of the top section for convenient tripod

mounting.

Two foldout legs are provided underneath the bottom of the control unit to elevate the

front of the cabinet to permit easy viewing of the meters.

Switches on the front panel are alternate action push-push type with the exception of the

three used for "plate control". These are mechanically interlocked so that only one

function can be selected at a time.

Controls are grouped by function.

The three pushbutton switches directly beneath the "PLATE VOLTAGE" meter relate to

meter range and function.

The three switches at the lower center of the panel labeled "PLATE CONTROL" affect

the charge/discharge condition of the plate.

The "HV" control knobs, the "HV ON" indicator and the "POLARITY" pushbutton switch

relate to the polarity and magnitude of the initial charge voltage on the plate.

The "TIMER LIMIT" switch sets the start/stop voltage limits for the timer.

The "OUTPUT" BNC connector (on the back panel) allows an oscilloscope or recorder

to be connected to the output of the fieldmeter. The signal here is 1/1000th of the actual

voltage on the plate—regardless of the settings of the meter range and function

switches.

Two small holes are provided in the plate for the attachment of standard or miniature

banana plugs, useful for measuring induced charge or decay rate on personnel.

IMPORTANT NOTE

In order to maintain proper operation of the floating plate, it is essential that the

support insulators be kept scrupulously clean. Consider the following:

■Do not touch or handle the insulators.

■Do not wrap the line cord around the insulators.

■Store the instrument in its protective case when not in use. Store in a clean dry location.

■Clean the insulators according to the directions given in the MAINTENANCE section

when self-discharge exceeds 10% of the set voltage within 5 minutes at relative humidity

of less than 50%. At high humidity surface leakage currents increase and air ionizes

readily and self-decay time can be expected to decrease regardless of how clean the

insulators are.

The Charged Plate Analyzer Model 268A meets test equipment requirements of the

EOS/ESD Association's EOS/ESD STANDARD NO. 3.1 "STANDARD FOR PROTECTION

OF ELECTROSTATIC DISCHARGE SUSCEPTIBLE ITEMS: IONIZATION".

Monroe Electronics, Inc. does not supply copies of standards.

Copies of the standard are available from:

EOS/ESD Association, Inc.

7902 Turin Rd.

Bldg 3 Suite 2 Rome, NY

13440-2069 Phone (315)

339-6937 Fax (315) 339-

6793 eosesd@aol.com

OPERATION

BASIC OPERATION - DISCHARGE MODE:

1. Separate sections and position as necessary. Connect to the proper power source and

press "|" on the power switch to apply instrument power. The displays will indicate that

power is on.

2. Select a polarity. For discussion purposes, we will select positive. Press the POLARITY

pushbutton in to lock.

3. Select a range. We will use 5kV as an example. Release the 5kV/2kV pushbutton under

the PLATE VOLTAGE meter.

4. Select NORMAL mode by releasing the NORM/PK pushbutton (under the meter).

5. Select TIMER LIMIT. Release the TIMER LIMIT pushbutton to set limits to 5kV and 500

volts. In general, the setting of this function should concur with the meter range selected.

6. Zero the plate by pressing the ZERO button. This removes all voltage from the plate. (It

connects the plate to ground through a 10k-ohm resistor.)

7. Charge the plate. Press the CHARGE button. The HV light indicates that the high voltage

is on. The PLATE VOLTAGE meter will indicate some voltage. Adjust the voltage to a

minimum of approximately 5kV +3% (5150 volts).

8. Allow the plate to decay. Press the DECAY pushbutton. In the absence of ions, the plate

will decay very, very slowly. In a balanced ion field, the plate will decay at a more rapid

rate.

9. As the plate voltage crosses the +5000 volt level, the timer will start. As the plate crosses

the +500 volt level, the timer will stop and indicate the elapsed time interval between

these two levels. Whenever the plate is recharged, the timer will be reset for the next

test.

BASIC OPERATION - PEAK MODE:

Peak mode is useful for checking balance in pulse ionizing systems. The timer is not

associated with these measurements. The internal high voltage charging source is not

normally used.

The switches used in making peak measurements are the three selector switches under the

PLATE VOLTAGE meter and the ZERO and DECAY switches.

1. Select a meter range using the 5kV/2kV switch.

2. Zero the plate by depressing the ZERO switch.

3. Select desired peak (+ or -).

4. Select PEAK mode by depressing the NORM/PK switch into the PK position.

5. Allow the plate to "float" by depressing the DECAY button. This ungrounds the plate. The

meter will now indicate the highest peak voltage attained by the plate in the selected

polarity. The -

PK/+PK switch may be shifted to the opposite position to read the highest peak voltage

attained in that polarity.

To balance your ionization system or blower, adjust until both positive and negative peak

readings are the same.

6. Anytime the NORM/PK button is released to the NORM position; the peak detector is

automatically reset.

7. The plate will continue to float until the ZERO button is pressed. Thus, the ZERO switch

and the RESET function of the NORM/PK switch are normally used in conjunction with

each other.

Section 4

MAINTENANCE

GENERAL:

Field maintenance of Model 268A should be limited to cleaning of the insulating standoffs,

cleaning of the case and occasional field-meter zero adjustment.

Further repairs and adjustment require special equipment and are beyond the scope of this

manual.

Factory service is advised.

CLEANING, INSULATORS:

The insulating standoffs (supporting the measuring plate) are specifically designed to

minimize the effects due to contamination of their outer surfaces. Leakage paths created by

the skin oils in fingerprints, tobacco smoke, dust, etc. will eventually degrade their

performance such that the self-decay rate of the plate will exceed 10% over a five-minute

period, indicating the need for cleaning.

IMPORTANT!

DO NOT USE SOAP, DETERGENT OR TAP WATER

TO CLEAN THESE INSULATORS

Clean the exposed surfaces of the insulators with mixture of 70% clean technical grade

isopropyl alcohol and 30% distilled water, using a soft toothbrush. The unit should be

inverted while doing this to minimize the amount of liquid entering the case.

The insulators should then be allowed to air-dry.

CLEANING, CASE:

General cleaning of the case for aesthetic reasons is best done with a clean lint- free cloth or

wiping pad dampened in the alcohol/water solution noted above.

FIELDMETER ZERO:

Airborne contaminants entering the sensitive aperture of the fieldmeter probe may cause a

zero shift, which will affect the accuracy of measurement.

A multi-turn potentiometer is provided on the upper section of the instrument to adjust

fieldmeter zero. Adjust for an indication of zero volts on the 2000 volt meter range with the

ZERO button pressed in.

Ce manuel convient aux modèles suivants

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