Valhalla Scientific Alpha 4314 Series Bedienungsanleitung

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Instra

Operation Manual

Model Alpha 4314

Digital Igniter Testers

VALHALLA

SCIENTIFIC

Need Help? Call 800-548-9806.

www.valhallascientiﬁc.com

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VALHALLA SCIENTIFIC INC. CERTIFICATION

Valhalla Scientific, Inc. certifies that this instrument was thoroughly tested and inspected and found to

meet published specifications when shipped from the factory. Valhalla Scientific, Inc. further certifies

that its calibration measurements are traceable to the Nation Institute of Standards and Technology to

the extent allowed by NIST’s calibration facility.

Due to continuing product refinement and due to possible parts manufacturer changes, Valhalla

Scientific, Inc. reserves the rights to change any or all specifications without notice.

VALHALLA SCIENTIFIC INC. WARRANTY STATEMENT

The warranty period for this instrument is stated on your invoice and packing list. Please refer to these

to determine appropriate warranty dates.

We will repair the instrument during the warranty period provided it is returned to Valhalla Scientific,

Inc. freight prepaid. No other warranty is expressed or implied.

Valhalla Scientific, Inc. is not liable for consequential damages.

Permission and a Return Material Authorization number (RMA) must be obtained directly from the

factory for warranty repairs. No liability will be accepted if returned without such permission.

Due to continuing product refinement and due to possible parts manufacturer change, Valhalla

Scientific reserves the right to change any or all specifications without notice.

ALPHA 4314 Digital Igniter Tester User Manual

Edition 1

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Documentation History

All Editions and Updates of this manual and their creation date are listed below. The first Edition of

the manual is 1. The Edition Number increments by 1 whenever the manual is revised. Updates,

which are issued between Editions, contain replacement pages to correct or add additional information

to the current Edition of the manual. Whenever a new Edition is created, it will contain all of the

Update information for the previous Edition. Each new Edition or Update also includes a revised copy

of this documentation history page.

Edition 1 …………………………………………………………………………………….March, 2003

Rev. A …………………………………………………………………………...…….August, 2003

Safety Symbols

Instruction manual symbol

affixed to product.

Indicates that the user must

refer to the user manual for

specific WARNING or

CAUTION information to

avoid personal injury or

damage to the product

Alternating current (AC)

WARNING, RISK OF

ELECTRICAL SHOCK.

Direct current (DC)

Indicates the field wiring

terminal that must be

connected to ground before

operation the equipment ---

protects against electrical

shock in case of fault.

WARNING

Calls attention to a procedure,

practice, or condition that could

cause bodily injury or death.

Frame or chassis ground

terminal --- typically

connects to the equipment’s

metal frame.

CAUTION

Calls attention to a procedure,

practice, or condition that could

possibly cause damage to

equipment or permanent lost of

data.

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WARNINGS

The following general safety precautions must be observed during all phases of operation, service, and

repair of this product. Failure to comply with these precautions or with specific warnings elsewhere in this

manual violates safety standards of design, manufacture, and intended use of the product. Valhalla

Scientific assumes no liability for the customer’s failure to comply with these requirements.

Ground the equipment: For Safety class 1 equipment (equipment having a protective earth terminal), an

interrupted safety earth ground must be provided from the main power source to the product input wiring

terminals or supplied power cable.

DO NOT operate the product in an explosive atmosphere or in presence of flammable gases or fumes.

For continued protection, replace the line fuse(s) only with fuse(s) of the same voltage and current rating

and type. DO NOT use repaired fuses or short-circuited fuse holders.

Keep away from live circuits: Operating personnel must not remove equipment covers or shields.

Procedures involving the removal of covers or shields are for use service trained personnel only. Under

certain conditions, dangerous voltage may exist even with the equipment switched off. To avoid dangerous

electrical shock, DO NOT perform procedures involving cover or shield removal unless you are qualified

to do so.

DO NOT operate damaged equipment: Whenever it is possible that the safety protection features built

into this product have been impaired, either through physical damage, excessive moisture, or any reason,

REMOVE POWER and do not use the product until safe operation can be verified by service-trained

personnel. If necessary, return the product to Valhalla Scientific for service and repair to ensure that safety

features are maintained.

DO NOT service or adjust alone: Do not attempt internal service or adjustment unless another person,

capable of rendering first aid and resuscitation, is present.

DO NOT substitute parts or modify equipment: Because of the danger of introducing additional

hazards, do not install substitute parts or perform any unauthorized modification to the product. Return the

product to Valhalla Scientific for service and repair to ensure that safety features are maintained.

Measuring high voltage is always hazardous: ALL multimeters input terminals (both front and rear)

must be considered hazardous whenever inputs greater than 42V (dc or peak) are connected to ANY input

terminal.

Permanent wiring of hazardous voltage or sources capable of delivering grater than 150VA should be

labeled, fused, or in some other way protected against accidental bridging or equipment failure.

DO NOT leave measurement terminals energized when not in use.

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Contents

Safety Symbols 3

WARNINGS 4

Chapter 1 General Information

Introduction 6

Manual Description 6

Instrument Description 7

Safety Considerations 7

Instrument Identification 7

Chapter 2 Unpacking and Installing

Inspection 8

Power Requirements 8

Installation 8

Chapter 3 Specifications

Range / Resolution / Test Current /

Failsafe Current 9

Accuracy 9

Temperature 9

General Specifications 10

Physical Specifications 10

Chapter 4 Optional Equipment

Available Options 11

Test Leads 11

Interface 12

Chapter 5 Operations

General 13

Front Panel 13

Rear Panel 13

4-Wire Resistance Measurements 14

Connections 15

Interpreting the Display 15

Failsafe Operations 15

Battery Monitoring Circuitry 16

Range Indicator LEDs 16

Chapter 6 Theory of Operation

General 17

Troubleshooting 17

Circuit Descriptions 18

Power Supplies 18

Constant Current Source 19

Transconductance Amplifier 20

Failsafe Design 20

Analog to Digital Converter 20

LED Display 21

Range LEDs 21

Chapter 7 Routine Maintenance

General 22

Required Test Equipment 22

Calibration Procedure 23

Battery Replacement Instructions 24

Chapter 8 Interface Operations

BCD Output 25

Chapter 9 Addendums

Addendums 26

Chapter 10 Parts List

Main Board Assembly 28

Display Board Assembly 30

Chassis & Final Assembly 31

Option BCD Assembly 32

Chapter 11 Schematics & Drawings

Alpha4314-070 1 of 5 i

Alpha4314-070 2 of 5 ii

Alpha4314-070 3 of 5 iii

Alpha4314-070 4 of 5 iv

Alpha4314-070 5 of 5 v

Alpha4314-071 1 of 2 vi

Alpha4314-071 2 of 2 vii

2053-76 viii

Alpha4314-080 1 of 1 ix

Alpha4314-700 1 of 1 x

Alpha4314-701 1 of 1 xi

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Chapter 1 General Information

Introduction

This manual has information to perform Inspection, Installation, Measurement Operations, and

Troubleshooting for Valhalla Scientific Model Alpha 4314. Also included in this manual are:

Specifications, Parts Lists and all Schematics.

Manual Description

This manual is separated into the 11 following Chapters.

Chapter 1 – General Information

Chapter 1 contains a brief description of the

instrument and other general information.

Chapter 2 – Unpacking and Installing

Chapter 2 contains information for unpacking

and inspection the equipment. Also contains

power requirements and installation procedure.

Chapter 3 - Specifications

Chapter 3 contains all specifications, including

Range, Resolution, Test Current, Failsafe

Current, Accuracy, General and Physical

Specifications for Valhalla Model Alpha 4314.

Chapter 4 – Optional Equipment

Chapter 4 contains information on all available

options and test leads for the Valhalla Model

Alpha 4314.

Chapter 5 – Operations

Chapter 5 describes all operations including a

description of the front and rear panel,

Measurements, Connections, Failsafe, and

Battery Monitoring.

Chapter 6 – Theory of Operation

Chapter 6 describes the theory of operation of all

circuits and sub circuits used on Valhalla Model

Alpha 4314.

Chapter 7 – Routine Maintenance

Chapter 7 contains maintenance information,

calibration procedure, and Battery replacement

instructions.

Chapter 8 – Interface Operation

Chapter 8 contains information on the optional

BCD Output.

Chapter 9 – Addendums

Chapter 9 lists updates and addendums for this

manual.

Chapter 10 – Parts List

Chapter 10 contains all parts used in the Main

Board, Display Board, and Chassis of the

Valhalla Model Alpha 4314. The parts are listed

with a Reference Designator, Valhalla Part

Number, Description, and Manufacturers Part

Number.

Chapter 11 – Schematics & Drawings

Chapter 11 contains all schematics and drawings

for Valhalla Model Alpha 4314.

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Instrument Description

The Valhalla Scientific Model Alpha 4314 Digital Igniter Tester is designed to provide

extremely safe and reliable resistance testing of explosive or volatile devices. Some of the

proven uses include: fuses, squibs, igniters, explosive bolts, automobile airbag initiators and

many others.

Essentially, a Model Alpha 4314 is a 4-wire ohmmeter which has been designed to use very low

test currents for its measurement. Additional circuitry proprietary to Valhalla Scientific is used

to ensure that test current levels do not exceed the specified "failsafe current" even in a worst-

case component failure situation. The failsafe feature is tested in every instrument before

shipment and the results provided to the customer on a Certificate of Calibration that

accompanies the unit.

The Alpha 4314 series consists of more then 35 different versions spanning the measurement

range from 1mΩresolution to 100MΩfull scale. The Alpha 4314 may have a maximum of four

(4) of eight (8) ranges installed at any one time. Unless otherwise specified when placing the

order, the Model Alpha 4314 with the 20Ω, 200Ω, 2kΩand 20kΩRanges is the standard

configuration. Instruments with special feature are also available. Please check Chapter 8 of this

manual for any addendums that may apply to special Alpha 4314 versions.

Standard feature of the Alpha 4314 is a battery monitoring circuit that alerts the user if the

batteries have become or will soon become unusable. Please refer to Chapter 5 for more details.

Front panel LED indicators provide a visual indication of which range are installed and which

range is selected. Also refer to Chapter 5 for details.

Safety Considerations

The Alpha 4314 Digital Igniter Tester is a battery operated equipment, for an optimal function of

the Failsafe circuitry DO NOT connect the battery charger while the instrument is in an ON

position. Always disconnect the battery charger before operating the instrument.

Instrument Identification

Valhalla Scientific instruments are identified by a two part serial number. The Serial Tag is

located on the rear or bottom of the instrument. The number is in a form of 00-0000. The first

two digits, called the serial number prefix, indicate the model. It changes only when a change is

made to the instrument. The last 4 digits, called the serial number suffix, are unique for each

individual unit.

Be sure to include the entire serial number, both prefix and suffix, in any correspondence about

your instrument.

The serial number can also be found on the Main Board, Calibration Tag and Certificate of

Calibration.

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Chapter 2 Unpacking and Installing

Inspection

If the shipping carton is damaged, request that the carrier's agent be present when the unit is

unpacked. If the instrument appears damaged, the carrier's agent should authorize repairs before

the unit is returned to the factory. Even if the instrument appears undamaged, it may have

suffered internal damage in transit that may not be evident until the unit is operated or tested to

verify conformance with its specifications. If the unit fails to operate or fails to meet the

performance specifications of Chapter 3, notify the carrier's agent and the nearest Valhalla Sales

Office. Retain the shipping carton for the carrier's inspection. DO NOT return equipment to

Valhalla Scientific or any of its sales offices prior to obtaining authorization to do so.

Power Requirements

The Model Alpha 4314 is powered by an internal rechargeable heavy-duty nickel-cadmium

battery pack. The battery charge is maintained by an external AC/DC converter that plugs into a

standard 115VAC receptacle. The AC adapter provides 6VDC @ 300mA.

For safety reasons, the Alpha 4314 may not be powered directly from the AC adapter. The

Alpha 4314 must be turned off and have the adapter connected in order to charge the batteries.

The battery pack may power the Alpha 4314 for up to 10 hours before requiring a recharge.

Although the batteries are fully charged prior to shipment, it may be desirable to refresh the

charge for 24 hours before use. As a rule of thumb, the Alpha 4314 requires twice as much time

to fully recharge as the amount of discharge time. For example, if the instrument was used

continuously for 2 hours, the AC adapter must be connected for 4 hours in order to fully restore

the charge.

Installation

The Model Alpha 4314 consumes little power and generates virtually no heat. Consequently, it

may be used in any area where the environment does not exceed the temperature specifications

of Chapter 3 page 10.

A rack mount adapter is available to allow installation of the Alpha 4314 in a standard 19"

equipment rack. This option is designated as Option R4. When installing this instrument in a

rack environment, avoid exposing the Alpha 4314 to extremes of temperature which will affect

accuracy and shorten battery life-span. For installation instructions, please refer to the drawing

included with the option.

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Chapter 3 Specifications

Range/Resolution/Test Current/Failsafe Current

Table 1

RANGE 20Ω200Ω2kΩ20kΩ200kΩ2MΩ20MΩ100MΩ

RESOLUTION 1mΩ10mΩ100mΩ1Ω10Ω100Ω1kΩ10kΩ

TEST

CURRENT 10mA 1mA 100µA 10µA 1µA 100nA 10nA 1nA

FAILSAFE

CURRENT[1] 16mA 1.8mA 180µA 18µA 1.8µA 180nA 18nA 1.8nA

[1] Typical value. Actual Failsafe Currents vary from instrument to instrument, and may be ±20% from the value.

The actual measured level is provided on the certificate of calibration.

Accuracy

Table 2

RANGE ACCURACY

20Ω± 0.03% of rdg ± 0.02% of rng

200Ω± 0.03% of rdg ± 0.02% of rng

2kΩ± 0.03% of rdg ± 0.02% of rng

20kΩ± 0.03% of rdg ± 0.02% of rng

200kΩ± 0.05% of rdg ± 0.05% of rng

2MΩ± 1% of rdg ± 0.2% of rng

20MΩ± 2% of rdg ± 0.2% of rng

200MΩ± 3% of rdg ± 1% of rng

Temperature

Temperature Coefficient: ±0.002% per °C (from 0°C-15°C and 35°C-50°C)

not applicable for 200kΩrange and above.

Operating Temperature Range: 0°C to 50°C

Storage Temperature Range: -10°C to 70°C

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