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WBJI                                                                                                                                                                        DSM-502 

 

PAGE 17 

 

 

105462 

SPACER #5 X 3/16” 

 

 

107479 

SWITCH RIGHT ANGLE BCD 

SW4 

 

108030 

I.C ON TIME PROG  8 BIT 

U1 

 

108117 

RESISTOR  10K  5% 

R1,14,15,16,20,21,24 

 

 

 

R26,47,59,60 

11 

 

108118 

RESISTOR 4.7K    5% 

R23 

 

108119 

RESISTOR   100 OHM   5% 

R50 

 

108123 

DIODE   100V 

D2,3,12,13 

 

108128 

CAP   .22MF  50V  10% 

C7 

 

108217 

RESISTOR 220K   5% 

R4 

 

108349 

RESISTOR 1K  5% 

R29,52,53,54 

 

108350 

RESISTOR 1MEG  5% 

R22,31,33,55,56,58 

 

108358 

CAP  0.1 MF  50 V  20% 

C1,3,5,8,14,15,16,17, 

 

 

 

C20,23,24,25,26,27,28, 

 

 

 

C29,30,31,33,34,35,36 

 

 

 

C37,38,39,40,42 

27 

 

 

 

108385 

CAP  10MF   25V   10% 

C9,10,11,19 

 

108433 

6-32X5/8 SWAG STANDOFF 

 

 

108661 

TRAN BIPOLAR  NPN  40V 

Q1,2,3 

 

108667 

CAP  1MF  16V    10% 

C4,6 

 

108791 

RESISTOR 82K  5% 

R2 

 

108793 

RESISTOR 56 OHM 

R19 

 

108847 

ECONORESET 

U4 

 

108865 

DUAL DIODE 

D7 

 

109127 

RESISTOR 560K   5% 

R18 

 

109134 

LP339M  I.C. 

U7 

 

109150 

RESISTOR 1.6K    5% 

R6,7,8,9,10,11 

 

109156 

I.C 

U3 

 

109262 

RESISTOR  10 MEG   5% 

R27 

 

109263 

CAP  22PF    50 V  5% 

C21,22,25 

 

109641 

CAP   470 PF  16 V   10% 

C18 

 

109930 

52 PIN SOCKET 

U1 

 

110162 

FERRITE   1000 OHM 400ma 

FB1,FB2 

 

110634 

RESISTOR   91K   5% 

R64 

 

111037 

CAP   100PF 1KV    10% 

C12A 

 

111888 

DIODE SCHOTTKY   30V 30 ma 

D1,4,6,7,8, 

 

112341 

RESISTOR  249K   1% 

R25,51 

 

112426 

RESISTOR   120 OHM  5% 

R57 

 

112452 

SOCKET  10 PIN 

J3 

 

 
7.3 DSM-502 LOGIC BOARD -- P/N 12472 

 

     JOHNSON P/N                            DESCRIPTION                                 REFERENCE                  QUANTITY  
                                                                                                                                                                   REQUIRED 
************************************************************************************************ 
 

112948 

2.5 X2MM RED LIGHT 

LED  1,2,3,4,5,6 

 

112995 

JUMPER  O OHMS 

J3 

 

112997 

TEST POINTS 

TP1,2,3,4,5, 

 

113013 

RF CONN GOLD CONTACT 

PROBE 1 

 

114058 

I.C. 3 mhz OP AMP 

U6 

 

114074 

RECTIFIER  12V   4.3 AMP 

Q4 

 

114185 

2 FORM C 5 V 2 COIL LATCH RELAY 

RY1 

 

114186 

8 mhz 18PF FUND 

Y1 

 

114187 

10 PIN  CONNECTOR 

J2 

 

114188 

4 PIN CONNECTOR 

J1 

 

114189 

15 V BUZZER  3kc 

SPK 1 

 

113191 

2K POT  1 TURN 

P8 

 

115253 

DIODE SCHOTTKY  

D10 

 

116203 

1K POT 1TURN 

P10 

 

116278 

50K  12TURN POT 

P1,2,3,4,5,6 

Summary of Contents for DSM-502

Page 1: ...DIGITAL SURVEY METER OPERATIONS MAINTENANCE MANUAL Direct Scientific www drct com tel 310 589 0601 fax 310 919 2981 email sales drct com...

Page 2: ...WBJI DSM 502 PAGE 2 SECTION CONTENTS 1 SPECIFICATIONS 2 DESCRIPTION 3 THEORY OF OPERATION 4 OPERATING CONTROLS 5 OPERATING INSTRUCTIONS 6 MAINTENANCE 7 PARTS LIST 8 SCHEMATICS...

Page 3: ...300 1500 VDC REGULATION 1 LOW VOLTAGE 5 VDC 5 VDC REGULATION 0 5 BATTERY 6 AA ALKALINE BATTERY OPERATION 200 HRS NOMINAL LCD READOUT 4 DIGIT 75 19mm TALL RS 232 DATA OUTPUT 9 PIN MINIATURE SUB D CONNE...

Page 4: ...is switch selectable from the front panel The electronic circuitry is located on 2 heavy duty industrial type printed circuit boards that are directly interconnected to improve reliability and durabi...

Page 5: ...re 3 show the power supply pc board s major components and calibration controls 4 0 OPERATING CONTROLS INDICATORS 4 1 CONTROLS MAIN FUNCTION SWITCH CONTROL SETTING FUNCTION OFF ALL POWER IS DISCONNECT...

Page 6: ...be 5 2 INSTRUMENT OPERATION 5 2 1 Adjust the MAIN SELECTOR switch to RATEMETER for normal ratemeter type operation 5 2 2 Depress the SPEAKER ZERO towards SPEAKER if a audible tick for each input pulse...

Page 7: ...WBJI DSM 502 PAGE 7 FIGURE 2 FIGURE 2 DSM 502 FRONT PANEL CONTROLS P N 12303 REV 6...

Page 8: ...WBJI DSM 502 PAGE 8 FIGURE 3 DSM 502 POWER SUPPLY AND MAJOR COMPONENTS P N 12291 1 REV 1 FIGURE 4 DSM 502 LCD DIGITAL PC BOARD COMPONENTS AND CONTROLS P N 12923...

Page 9: ...IT FAST SLOW TC SET TO FAST ADJ P1 TO 10 250 SECONDS SET TO SLOW ADJ P1 TO 10 250 SECONDS POSITION 9 DISPLAY EDIT LCD REFRESH RATE 8 0 8 SECONDS TO 30 3 0 SECONDS ADJ P1 TO DESIRED REFRESH RATE SW5 lo...

Page 10: ...e MAIN SELECTOR SWITCH at the same setting as was used to disable the OVER RANGE ALARM 6 4 7 Adjust SW4 to position 2 and depress SW5 until the CAL is visible on the display 6 4 8 Adjust P1 P2 until d...

Page 11: ...sed and the CAL is displayed on the readout INTERNAL PROBE DT ADJUSTMENT 6 6 1 Determine the full scale range for the Internal Probe 6 6 2 Be sure MAIN SELECTOR SWITCH is still in RATEMETER position a...

Page 12: ...isappears to save the data Adjust SW4 to the NORMAL OPERATION POSITION 0 ZERO 6 7 5 The survey meter is now ready for NORMAL OPERATION 6 8 ADJUSTING ALARM SETPOINTS GENERAL THE DSM 502 HAS AN AUDIBLE...

Page 13: ...ITCH TO COUNT Adjust SW4 to position 1 This displays the counting time in seconds currently in the system 6 9 2 To set the count time to change COUNT time Depress SW5 until CAL appears 6 9 3 Adjust P3...

Page 14: ...WBJI DSM 502 PAGE 14 6 9 11 If the instrument remains ON a new count cycle can be started by DEPRESSING THE ZERO SWITCH on the front panel for at least 3 seconds...

Page 15: ...WBJI DSM 502 PAGE 15 PARTS LIST...

Page 16: ...100K 5 R2 3 4 5 6 21 R22 23 24 25 R26 27 28 32 14 111143 TERM STRIP 50 PIN J2 10 112729 TRANS 60V 500ma Q1 1 114115 FERRITE CHIP 2 5 A 120 OHM FB2 FB3 2 114206 CRYSTAL 10 MHZ SMT X1 1 114293 SLIDE SW...

Page 17: ...M I C U7 1 109150 RESISTOR 1 6K 5 R6 7 8 9 10 11 6 109156 I C U3 1 109262 RESISTOR 10 MEG 5 R27 1 109263 CAP 22PF 50 V 5 C21 22 25 3 109641 CAP 470 PF 16 V 10 C18 1 109930 52 PIN SOCKET U1 1 110162 FE...

Page 18: ...C24 1 108829 47K 1 8W 1206 PKG R18 1 109011 SOT 23 60V 150A PNP BIPOLAR Q1 1 109133 5V REGULATOR E1 1 109156 MC33172D I C U1 3 2 109163 110K 1 8W 1206 PKG R 6 14 2 109641 470MF 16V C15 1 109896 2 4K 1...

Page 19: ...WBJI DSM 502 PAGE 19 SCHEMATICS...

Page 20: ...WBJI DSM 502 PAGE 20...

Page 21: ...WBJI DSM 502 PAGE 21...

Page 22: ...WBJI DSM 502 PAGE 22...

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