Amptec Research 620A SERIES Operation And Maintenance Manual Download | Manualshive

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Summary of Contents for 620A SERIES

Page 1: ...any other markings on the document It will not be downgraded or declassified without written approval of the originating United States agency DISTRIBUTION STATEMENT Distribution authorized to U S Gov...

Page 2: ...Digital Ohmmeter 10900 Research Blvd PMB1 Suite 160 C AUSTIN TX 78759 USA CAGE CODE 1CRL2 Phone 1 800 350 5105 from the USA FAX 1 800 430 5440 from the USA or 512 447 7455 website http www amptec com...

Page 3: ..._________________ AMPTEC s permission and a return authorization RMA number must be obtained directly from our customer service department via phone FAX or email for repairs warranty or otherwise We m...

Page 4: ...B 2 Specifications C 1 Available Accessories and Options C 2 Test Lead and Probe Sets D 1 General D 2 Front Panel D 3 Rear Panel D 4 4 Wire Resistance Measurement D 5 Connections D 6 Failsafe Operatio...

Page 5: ...onverter E 5 1 Constant Current Source E 5 2 Constant Current Circuit Operation E 6 Failsafe Design E 7 Ultra Safe Power Supply Scheme F 1 General F 2 Required Test Equipment F 3 Calibration Procedure...

Page 6: ...for any addendums that may apply to any differences between the newer rev D version 620A 4s and older rev C 620A 4 Igniter Testers with serial numbers less than 620A4 800 i e 620A4 525 Should the rec...

Page 7: ...s Recharge time is typically twice the Power On time An Overnight charge usually restores the 620A 4 to a Fully Charged ready to use state If you turn on the 620A 4 and the display does not come on it...

Page 8: ...s batteries charged for 12 to 24 hours it is ready for use The 620A 4 only draws a little electrical power internal battery based and generates virtually no heat Consequently it may be used in any are...

Page 9: ...g normal 8mA worst case when faulty 20 000 count 4 digit Super Bright Light Emitting Diodes LED or select next higher range 620A Display flashes Approximately 300ms 250VDC or AC without damage clamped...

Page 10: ...ntity four 4 Option 100 Carrying Case Option 100 is a hardshell impact resistant plastic shock absorbing foam lined meter and accessory carrying case for the 620A Ohmmeter with extra room for test lea...

Page 11: ...medium size up to diameter conductors The dual banana plugs terminations connect directly to the 620A s front panel input terminals see Option 290 for a photo of the banana plug ends Option 305 Banana...

Page 12: ...0 connector out to the resistance under test just as the 4000ITS Ohmmeter or Alinco 101 series Igniter Testers would perform For the most recent information regarding this adapter related probes and a...

Page 13: ...witch is placed in the ON position the battery pack is disconnected isolated from the rear panel charging jack The possibility of a voltage between the device under test and AC Power ground is therefo...

Page 14: ...ers a precise constant current The internal high impedance DVM senses the voltage drop across the load There is negligible contact and lead resistance error created by the voltage measurement because...

Page 15: ...A Series Igniter Tester Ohmmeter incorporate a proprietary current source design that renders them incapable of delivering excessive voltage or current to the device under test The typical fail safe c...

Page 16: ...as possible before trying to pin the problem down to a specific component Certain questions should be asked such as Does the problem occur on all ranges or on a specific range only The power supplies...

Page 17: ...llowing descriptions references to integrated circuits are given in the form IC201 1 which refers to Integrated Circuit 201 pin 1 E 4 Analog to Digital Converter The A to D conversion is done with a I...

Page 18: ......

Page 19: ...D During the Deintegrate phase switch 5 is closed and a voltage which is V REF more positive than during Auto Zero is impressed on the BUFFER INPUT Thus the referance capacitor stores the equivalent v...

Page 20: ...ill be reached when the output of 1C201 is equal to the non inverting input of 1C202 Again this condition occurs when the voltage drops across R212 and R222 are equal to the voltage drops across R213...

Page 21: ...C2 The 5 VA is developed by the DC to DC convertor circuitry composed of Q103 Q104 T102 D103 D104 IC102 for the negative polarity For the positive polarity 5V the supply circuit is composed of Q101 Q1...

Page 22: ...Figure E 5 LED Display Pin Functions...

Page 23: ...red to calibrate the AMPTEC 620A 4 Calibration of versions other than the AMPTEC 620A 4 use the same basic procedure however different standard resistor values may apply for different resistance range...

Page 24: ...e cover and feet screws taking care not to pinch any wires Low Battery Indicator The variable potentiometer trimpot RV3 is factory adjusted to have the low battery indicator come on at 4 50 VDC To mak...

Page 25: ...SECTION G COMPONENT PARTS LISTS ___________________________________________________ The following parts lists are included in this manual 620 400 2 pages 620A Main Board Components List Rev D...

Page 26: ...e line See Above line See Above line See Above line R10 1 9 0 05 50ppm C Wire Wound R223 1 100 0 025 50ppm C 1 4W Wire Wound R224 1 900 0 025 50ppm C 1 4W Wire Wound R225 1 9K 0 025 50ppm C 1 4W Wire...

Page 27: ...hru Q104 4 NPN Transistor T092 2N4401 Q201 1 N Channel JFET 01899E or PN4392 or J111 Q202 1 NPN Transistor T0220 MJE3439 1 Zener reference 6 3V 20ppm C 5 1N825 1 Single LED Red Small Hewlett Packard H...

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