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Related Manuals for Valhalla Scientific Alpha 4314
Summary of Contents for Valhalla Scientific Alpha 4314
- Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
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Page 2: Alpha4314-080 1 Of
Model Alpha 4314 Digital Igniter Testers Operation Manual Need Help? Call 800-548-9806. VA L H A L L A www.valhallascientific.com ©2015 Valhalla Scientific, Inc. All Rights Reserved. Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com... -
Page 3: Alpha4314-071 1 Of
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. -
Page 4: Safety Symbols
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. -
Page 5: Warnings
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. -
Page 6: Table Of Contents
Contents Safety Symbols Circuit Descriptions WARNINGS Power Supplies Constant Current Source Transconductance Amplifier Chapter 1 General Information Introduction Failsafe Design Manual Description Analog to Digital Converter Instrument Description LED Display Safety Considerations Range LEDs Instrument Identification Chapter 7 Routine Maintenance General Chapter 2 Unpacking and Installing Inspection... -
Page 7: Chapter 1 General Information
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. -
Page 8: Instrument Description
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"... -
Page 9: Chapter 2 Unpacking And Installing
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. -
Page 10: Chapter 3 Specifications
Chapter 3 Specifications Range/Resolution/Test Current/Failsafe Current Table 1 RANGE 20Ω 200Ω 2kΩ 20kΩ 200kΩ 2MΩ 20MΩ 100MΩ RESOLUTION 1mΩ 10mΩ 100mΩ 1Ω 10Ω 100Ω 1kΩ 10kΩ TEST 10mA 100µA 10µA 1µA 100nA 10nA CURRENT FAILSAFE 16mA 1.8mA 180µA 18µA 1.8µA 180nA 18nA 1.8nA... -
Page 11: General Specifications
General Specifications Display Type: 4 ½ digits Light Emitting Diodes (LED) (19999) Overload Indication: Display flashes Conversion Rate: 3 readings per second Terminal Configuration: 4-Wire Kelvin Current Source Compliance Voltage: Clamped at 1.6V Power: (4 “D” Cell) 1.2V rechargeable NiCad Batteries 4000mAh Battery Charger: Provides 6VDC at 300mA nominal... -
Page 12: Chapter 4 Optional Equipment
Option "CC4" is a meter and accessory carrying case with extra room for test leads, battery charger, etc. Option R4: Rack Mount Adapter Option "R4" is an adapter tray that allows the Alpha 4314 to be installed in a standard 19" equipment rack. Test Leads Option K: 4-Wire Kelvin Lead Set Option "K"... -
Page 13: Interface
Valhalla Model 1248. (See Chapter 8) Model 1248: Dual-Limit Comparator The Valhalla Model 1248 may be used in conjunction with an Alpha 4314 and Option BCD above. The Model 1248 is a dual-limit BCD comparator that interprets the display indications of the ohmmeter as either "HI", "LO"... -
Page 14: Chapter 5 Operations
Charging Jack The battery charging jack is a barrel type and is located on the Alpha 4314 rear panel. The center pin of the connector is positive. The charging requirements of the internal battery pack are 6VDC @300mA. -
Page 15: 4-Wire Resistance Measurements
In many applications the contact resistance can exceed the value of the load by several orders of magnitude. The Alpha 4314 bypasses this potential error source by providing two terminals of constant current and an additional two terminals for high impedance voltage measurement. -
Page 16: Connections
The typical failsafe current for each range is indicated under the corresponding range LED marker on the Alpha 4314 front panel. Please refer to Failsafe Design in Chapter 6 for a technical description of the failsafe circuitry. -
Page 17: Battery Monitoring Circuitry
Range Indicator LEDs The Alpha 4314 can have 4 of 8 possible ranges. The ranges installed are indicated on the front panel by a series of lit LEDs. The range that is selected during measurement is indicated by a RED LED. -
Page 18: Chapter 6 Theory Of Operation
Alpha 4314. If the Model Alpha 4314 exhibits problems that cannot be eliminated by reviewing Chapter 3 and 5, the following guidelines have been established to help solve the problem. -
Page 19: Circuit Descriptions
Model Alpha 4314. Component Replacement If the problem has been identified as a faulty component, the accuracy of the Alpha 4314 can be maintained only if the following precautions are taken: a) Use only the specified component or its exact equivalent. Spare parts can be ordered... -
Page 20: Constant Current Source
The +10 and -10 volt supply is developed by a DC/DC converter composed of Q1, Q2, T1, D2, D3, D4, D5 and their associated components. The +5 volt supply is provided directly by the batteries or regulated from the +10V supply by IC2. The -5 volt supply is regulated from the -10 volt supply by IC1. -
Page 21: Transconductance Amplifier
25mA before the DC/DC converter disengages, dropping the -5 volt output to zero. Analog to Digital Converter The Analog to Digital conversion in the Model Alpha 4314 is aloud by IC 7 and its associated components. The reference voltage applied to IC7-2 is 1Volts. 1.2Volts are generated buy D16 and adjusted by R40 before being applied to IC7-1. -
Page 22: Led Display
LED Display The signal converted by IC9 is applied to four 7 Segment LEDs (DS2-DS5) and a ±1 LED (DS1). Concurrently, driver transistors Q5 through Q9 are turned on in sequence. This sequence is repeated at the 120 kHz rate, and the data display consequently appears to be continuous. Low battery status is indicated by the “–”... -
Page 23: Chapter 7 Routine Maintenance
Required Test Equipment Following is a list of the standard resistors and other equipment required to calibrate the Model Alpha 4314. Note: The Precision Resistors necessary for the calibration of the Alpha 4314 varies based on the installed ranges. Precision Resistors: .1Ω... -
Page 24: Calibration Procedure
Calibration Procedure The Alpha 4314 should be calibrated with fully charged batteries and should be allowed to warm-up for a minimum of 15 minutes before beginning the procedure. The adjustments are accessed by removing the four feet screws, then lifting off the top cover only. The locations of the adjustments are shown on drawing number Alpha4314-700 in Chapter 11. -
Page 25: Battery Replacement Instructions
3. Check the display for 0 ± 3 digits Battery Replacement Instructions The rechargeable NiCad batteries used in the Alpha 4314 are very durable and should provide years of trouble-free operation. As with all batteries, replacement will eventually be necessary. Batteries may be ordered from Valhalla Scientific as stock #05-10117, quantity: (4). -
Page 26: Chapter 8 Interface Operations
Chapter 8 Interface Operations BCD Interface Option BCD has a rear mounted 50 pin Amphenol connector providing data in a parallel binary- coded-decimal (BCD) format. The outputs are TTL compatible and may drive 1 LS load. The summary of pin functions is provided below and on the schematic number 2053-076 at the back of this manual. - Page 27 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...