Amptec Research 620A 4R Operation And Maintenance Manual Download Page 34

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R218

R217

R216

IC1

C202

C201

IC202

D202

R202

D201

R212

R12

R210

R226

IC101

C111

C101

T101

Q101

Q102

C108

C107

C105

C103

IC102

R105

R103

R101

D101

C112

C102

T102

Q103

Q104

C109

C106

C104

R106

R104

R102

D102

D103

D104

R219

R215

R220

R203

IC201

Q201

Q202

R209

R21

R207

R205

R204

R206

R201

R214

R21

R10

R208

R221

R222

R213

IC7

RV1

R14

V201

R13

R15

IC3

C11

RV2

C12

IC4

RN1

Q4 Q3 Q2 Q1

R17B

IC9

C10

R225

R224

R223B

C13

RV3

R20

R19

IC8

R16

R18

IC10

IC11

R23

R22

R24

C113

R25

RL1

IC5

IC6

ILO

IHI

R26

RV5

RV6

R227B

R11

R27

R28

C14

R229

R228

D204

R223A

R227A

D203A,B

R17A

FAN

REV

-E

CAGE CODE 1CRL2

JUMPER

X10

VLO VHI

700N

620A-

RESEARCH

AMPTEC

MAIN

CHARG

FUSE

BAT

-5

RESEARCH

AMPTEC

MAIN PCB ASSEMBLY
Drawing 620-600

Scale : 1"=1.15" Approx.

Revision E

(PCB)

Page 1 of 1

27NOV2001

Summary of Contents for 620A 4R

Page 1: ...AUSTIN TEXAS 78737 USA CAGE CODE 1CRL2 PHONE 512 858 4045 or 1 800 350 5105 from the USA e mail info amptec com FAX 512 858 4340 or 1 800 430 5440 from the USA website http www amptec com 620A 4R Batt...

Page 2: ...ARRANTY ________________________________________________________ Permission and a return authorization RMA number must be obtained directly from AMPTEC s customer service department via phone FAX or e...

Page 3: ...Charger Power Requirements A 5 Setup and Use CHAPTER B 620A 4R FAILSAFE OHMMETER SPECIFICATIONS Table B 2 Specifications CHAPTER C REPLACEMENT OPTIONAL ANDACCESSORYITEMS C 1 Available Accessories and...

Page 4: ...ER F ROUTINE MAINTENANCE F 1 General F 2 Required Test Equipment F 3 Calibration Procedure F 4 Battery Replacement Instructions CHAPTER G COMPONENT PARTS LISTS 620 400 Parts Assembly list CHAPTER H SC...

Page 5: ...eable batteries reach a low charge level a negative sign will appear on the display The 620A 4R has a battery monitoring circuit that indicates it is time to plug in the battery charger A 2 Receiving...

Page 6: ...d is open The 620A 4R has a way to remove it s lid completely for example when used in an indoor laboratory environment With the 620A 4R open remove the units two hinge pins hex type by twisting them...

Page 7: ...entioned earlier of course the AC DC Battery Charger must be plugged into the 620A 4R s notched connector to facilitate charging the batteries Although the batteries are fully charged prior to shipmen...

Page 8: ...d 35 C 50 C Instrument Display 20 000 count 4 digit Super Bright Light Emitting Diodes LED Over Range Indication select next higher range 620A 4R Display flashes Measurement Update Rate Approximately...

Page 9: ...er that verifies each individual replacement battery voltage charge level inspector signature along with the inspection date CHAPTER C REPLACEMENT OPTIONALAND ACCESSORY ITEMS 3 2 Test Lead Sets and Pr...

Page 10: ...Terminal Kelvin Mini probes photo shown above Each probe has two spring loaded gold plated steel tips with 0 18 separation one red and one black handheld probe Excellent general purpose 4 Wire Kelvin...

Page 11: ...anana leads which provide a 4 wire Kelvin connection from the adapter to the 620A Ohmmeter No lead resistance errors In some applications i e AIM 7 Missile harnesses regular alligator clip leads canno...

Page 12: ...s just below the display on the left see item 11 of the 620A 4R Front Panel Diagram When a given range is selected an indicator LED informs the user Also note that a resistance range must be selected...

Page 13: ...rews have been removed for calibration access 4 Test Lead Connection Panel Jacks The 48 long dual banana Alligator Test Leads plug directly into the Voltage High and Voltage low and Current high and C...

Page 14: ...item 7 of the 620A 4R Diagram The fuse protects internal batteries from excessive charging currents Replace blown fuses with the same type and rating only The Charging System The slimline AC to DC bat...

Page 15: ...shielded In addition custom probes and test lead sets are optionally available for customized wiring connections kelvin clips cables terminated with spade lugs and special banana jacks All AMPTEC ohm...

Page 16: ...512 447 7456 International Overseas or FAX 512 447 7455 email service amptec com D 7 Failsafe Operation The AMPTEC 620 Series of Igniter Testers or failsafe ohmmeters incorporate a constant current s...

Page 17: ...50 VDC To make this adjustment first remove the fuse from the fuseholder With an adjustable DC power supply set the power supply output to be 4 50 VDC Be sure to observe power supply polarity Connect...

Page 18: ...cate the batteries need charging or fuse needs replacing If the 620A 4R exhibits problems that cannot be eliminated by reviewing Chapters B and D the following guidelines have been established to help...

Page 19: ...or move the replacement part until the solder has cooled Cold solder and bad solder joints can cause more problems Use the chassis ground connect to the common terminal of the functional test section...

Page 20: ...the analog part and the ICL71C03 takes care of the digital part of the 4 digit 20 000 count dual slope conversion COUNTERS DISPLAY COMPARATOR BUFFER MULTIPLEXER ZERO CROSSING DETECTOR INTEG UUT CONTRO...

Page 21: ...EGRATOR INTEGRATOR COMPARATOR COMPARATOR CAZ CAZ CSTRAY CSTRAY RINT RINT FIGURE E 2B PHASE ll INTEGRATE INPUT FIGURE E 2C PHASE lll AND DE INTEGRATE CINT CINT VIN VIN CREF CREF 3 3 1 1 2 2 6 6 5 5 4 4...

Page 22: ...shed in Phase I The time or number of counts required to do this is proportional to the input voltage E 4 1 Reference Voltage The precision reference voltage required to do the A D conversion is devel...

Page 23: ...t as it was when the output terminals were shorted The current through R is 10 L milliamperes just as it was through the jumper when the output terminals were shorted E 6 Failsafe Design Reference to...

Page 24: ...wer Supply Scheme The 5 volt power supply is provided directly by the batteries for driving the LED displays and digital logic The 5VD is used for driving IC8 the low battery detection circuit The 15V...

Page 25: ...range push buttons covered by silicone rubber boots and their corresponding panel mount LEDS IC 2 is a latch that will latch its output to the corresponding range push button input Its output turns o...

Page 26: ...AMPTEC 620 package may have too much resistance offset for the actual calibration of 620 Igniter Testers versions fitted with a low 2 0 Ohm range Contact AMPTEC for information on the 305 48 long 4 w...

Page 27: ...n Return the calibration access screws to the perimeter of the 620 main top panel 2 Adjust RV1 for a display indication of 100 00 3 Check the 2 0 KOhm range with the 1000 Ohm Standard Resistor Check t...

Page 28: ......

Page 29: ...3 D104 and D202 D201 D203 Relay Board 04 30015 1 620A Relay Board DWG 620A 702 REVB RL1 05 03006 1 Relay Aromat S2EB 5V CHG1 05 79393 1 Slimline 9 VDC Battery Charger AMPTEC Modified Volgen Model LV 1...

Page 30: ...rostat 50KW DK RV6N503C ND Allied 753 2503 HNDL1 05 77201 2 Handles Front Panel Mount Type Allied 839 9119 STF1 05 77251 2 Standoff Box of 100 Allied 839 2357 KB1 05 77311 1 Knob for shaft of the zero...

Page 31: ...ly Rev D 620 601 2 1 page 620 Display Board Assembly 620 070 3 pages 620 Ohmmeter Schematics 1 DVM1 Rev D 2 I_SRC Current Source Rev D 3 DISP Display Rev D 620 077 1 page 620 Relay PCB Schematic Rev A...

Page 32: ...bon Cable Header routes to the Top Panel D6 Q6 D7 Q7 D8 8 Q8 470W R6 470W R10 620 RELAY BOARD Drawing 620 077 Cage Code 1CRL2 RESEARCH AMPTEC Page 1 of 1 INPUTS OUTPUT OE LE D Q L H H H L H L L H X X...

Page 33: ...620 FRONT PANEL RANGE SWITCH SCHEMATIC Drawing 620 078 RESEARCH AMPTEC Page 1 of 1 Front Panel LED Indicators 2KW Range Indicator 200W Range Indicator Revision A Scale none...

Page 34: ...D1 C1 C2 D2 RV1 D3 R4 R9 R6 R14 RV201 R13 R3 R2 R1 R15 Q5 R7 C3 C5 C4 R8 IC3 C11 RV2 C12 IC4 RN1 Q4 Q3 Q2 Q1 D5 R17B C8 IC9 C10 S1 D4 R225 R224 R223B C13 RV3 P1 R20 R19 IC8 C9 R16 R18 IC10 IC11 R23 R2...

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