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Lake Shore Model 642 Electromagnet Power Supply User’s Manual
7-20 Service
7.13.3.6 Calibrate Current Reading Gain
1. Send “CALG 0, 1”. To set the output current reading gain constant to 1.
2. Set the Model 642 output current to –70 A. (Ramp rate 30 A/s nominal).
3. Wait 30 seconds.
4. Measure the actual voltage across the shunt and record (V
shunt
).
5. Calculate and record (I
measuredneg
): V
shunt
/R
shunt
.
6. Get the Model 642 output current reading (by front panel or interface) and record (I
readingneg
).
7. Set the Model 642 output current to +70 A (Ramp rate 30 A/s nominal).
8. Wait 30 seconds.
9. Measure the actual voltage across the shunt and record (V
shunt
).
10. Calculate and record (I
measuredpos
): V
shunt
/R
shunt
.
11. Get the Model 642 output current reading (by front panel or interface) and record (I
readingpos
).
12. Calculate gain constant per the following equation:
Current Reading Gain Constant = (I
measuredpos
– I
measuredneg
)/(I
readingpos
– I
readingneg
)
13. Verify gain factor to be 1, ±0.02.
14. Send “CALG 0, gain constant”.
15. Verify the Model 642 output current reading to equal I
measuredpos
, ±0.010 A.
16. Set the Model 642 output current to 0 A.
17. Send “CALSAVE” to write this calibration to non-volatile memory.
This method is somewhat lengthy, but averages the differences between positive (+) and negative (–) excursions.
7.11.3.7 Calibrate Voltage Reading Gain
1. Send “CALG 5, 1”. To set the output voltage reading gain constant to 1.
2. Set the Model 642 output current to 65 A.
3. Wait 30 seconds.
4. Measure the Model 642 actual output voltage at the output terminals and record (V
measuredpos
).
5. Get the Model 642 output voltage reading (by front panel or interface) and record (V
readingpos
).
6. Set the Model 642 output current to –65 A.
7. Wait 30 seconds.
8. Measure the Model 642 actual output voltage at the output terminals and record (V
measuredneg
).
9. Get the Model 642 output voltage reading (by front panel or interface) and record (V
readingneg
).
10. Calculate gain constant per the following equation:
Voltage Reading Gain Constant = (V
measuredpos
-V
measuredneg
)/(V
readingpos
-V
readingneg
)
11. Verify the gain factor to be 1, ±0.02.
12. Send “CALG 5, gain constant”.
13. Verify the Model 642 output voltage reading to match the actual output voltage within, ±0.001 V.
14. Set the Model 642 output current to 0 A.
15. Send “CALSAVE” to write this calibration to non-volatile memory.
- Model 642 1
- TABLE OF CONTENTS 5
- LIST OF ILLUSTRATIONS 9
- LIST OF TABLES 10
- CHAPTER 1 11
- INTRODUCTION 11
- 1-2 Introduction 12
- Introduction 1-3 13
- Description (Continued) 13
- 1.2 SPECIFICATIONS 13
- 1-4 Introduction 14
- Specifications (Continued) 14
- Introduction 1-5 15
- 1-6 Introduction 16
- Introduction 1-7 17
- 1.3 SAFETY SUMMARY 17
- 1-8 Introduction 18
- Safety Summary (Continued) 18
- Introduction 1-9 19
- 1.4 SAFETY SYMBOLS 19
- 1-10 Introduction 20
- CHAPTER 2 21
- MAGNET SYSTEM DESIGN 21
- INSTALLATION, AND OPERATION 21
- Magnet System Design 2-3 23
- 2-6 Magnet System Design 26
- Magnet System Design 2-7 27
- 2-8 Magnet System Design 28
- CHAPTER 3 29
- INSTALLATION 29
- 3-2 Installation 30
- 3.2 REAR PANEL DEFINITION 30
- TERMINAL SCREW 32
- WIRE FERRULE 32
- VOLTAGE SELECTOR CARD 32
- VOLTAGE INDICATOR KEY 32
- 3-6 Installation 34
- 3.3.6 Wiring Cover 34
- NO SWITCHES EMERGENCY STOP 35
- REMOTE ENABLE 35
- ALARM CONTACTS 35
- TO REMOTE ALARM CIRCUIT 35
- VALVE AND SWITCH 36
- SOLENOID VALVE 37
- WITH MOUNTING BRACKET 37
- ADJUSTABLE HOSE CLAMP 37
- REINFORCED HOSE 37
- 230 mm (9 in) LONG 37
- LUG COVER 38
- 3-12 Installation 40
- 3.12 DETACHABLE HANDLES 40
- 3.13 RACK MOUNTING 40
- CHAPTER 4 41
- OPERATION 41
- +70.0000 A +35.000 V 42
- Operation 4-3 43
- 4.4 KEYPAD DEFINITION 43
- 4-4 Operation 44
- 4.5 DISPLAY SETUP 44
- 4.6 SETTING OUTPUT CURRENT 44
- Operation 4-5 45
- 4.7 CURRENT RAMP RATE 45
- 4.8 RAMP SEGMENTS 45
- 4-6 Operation 46
- Ramp Segments (Continued) 46
- 4.9 PAUSE RAMP 46
- 4.10 ZERO OUTPUT 46
- Operation 4-7 47
- 4.11 MAXIMUM SETTING LIMITS 47
- 4-8 Operation 48
- 4.12 MAGNET WATER 48
- 4.13 INTERNAL WATER 48
- 4.14 ERROR STATUS DISPLAY 48
- Operation 4-9 49
- 4.16 LOCKING THE KEYPAD 49
- 4-10 Operation 50
- 4.17 COMPUTER INTERFACE 50
- CHAPTER 5 53
- COMPUTER INTERFACE OPERATION 53
- 5.1.2 Remote/Local Operation 54
- Message Strings (Continued) 56
- 5.1.4 Status System 56
- 5.1.4.1 Overview 56
- Register Method Example 59
- *ESE, *ESE? 60
- ERSTE, ERSTE? 62
- *SRE, *SRE? 64
- IBCONF.EXE.eps 71
- 5.1.5.3 Program Operation 72
- 5.1.6 Troubleshooting 72
- 5.2.1 Changing Baud Rate 73
- 5.2.2 Physical Connection 73
- 5.2.6 Message Flow Control 75
- 5.2.7.2 Program Operation 79
- 5.2.8 Troubleshooting 79
- 5.3 COMMAND SUMMARY 80
- CHAPTER 6 91
- OPTIONS AND ACCESSORIES 91
- 6-2 Options and Accessories 92
- CHAPTER 7 93
- SERVICE 93
- 7-2 Service 94
- 7.3 LINE VOLTAGE SELECTION 94
- 7-4 Service 96
- Figure 7-3. Circuit Breaker 96
- Service 7-5 97
- 7.6 ERROR MESSAGES 97
- 7-6 Service 98
- Table 7-3. Operational Errors 98
- 7.7 ELECTROSTATIC DISCHARGE 98
- 7-8 Service 100
- DIGITAL BOARD 101
- LOCATOR PINS 102
- MOUNTING SCREWS 102
- 7-12 Service 104
- 7.10.3 Auxiliary Connector 104
- Pin Name 104
- 7-14 Service 106
- Service 7-15 107
- Pin Symbol Description 107
- 7-16 Service 108
- 7.11 CALIBRATION 108
- 7.11.1 Calibration Interface 108
- 7-18 Service 110
- Service 7-19 111
- 7-20 Service 112
- Service 7-21 113
- 7-22 Service 114
- APPENDIX A 115
- GLOSSARY OF TERMINOLOGY 115
- – 1855) a German 117
- Factor Prefix Symbol 119
- APPENDIX B 121
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