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Creating a Switchbox
Instrument
In a switchbox instrument, signals are routed (switched) to a voltmeter
external to the HP 75000 Series B or Series C mainframe. Multiplexer
channel openings and closings are controlled by the user through commands
sent directly to the switchbox. A switchbox instrument is created as follows:
• The instrument must have one module (multiplexer) assigned as the
instrument identifier. The instrument identifier is the module with a
logical address that is a multiple of 8 (8, 16, 24, …).
• The multiplexers in the switchbox instrument must have successive
logical addresses, beginning with the logical address of the
instrument identifier. For example, the multiplexers in a switchbox
might have logical addresses of 112, 113, 114, and so on.
• All strain gage multiplexers have a factory set logical address of 112.
The logical address is changed using the logical address switches
shown in Figure 1-5.
Note Detailed information on creating virtual instruments in a VXIbus system
can be found in the HP 75000 Series B Installation and Getting Started
Guide, or in the HP E1406A Command Module User’s Manual.
Figure 1-5. Creating a Scanning Multimeter and a Switchbox
20 Getting Started with the Strain Gage Multiplexers Chapter 1
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- Contents 2
- WARNINGS 9
- Documentation History 9
- Safety Symbols 9
- BUSINESS REPLY MAIL 12
- Multiplexers 14
- Identifying the 15
- Terminal Module 15
- Setting the Card ID 17
- Selecting the 18
- Interrupt Line 18
- Internally Supplied 19
- Bridge Excitation 19
- Strain Gage 20
- Multiplexer 20
- Configurations 20
- Instrument 22
- Addressing 22
- Connecting the 23
- Chapter 2 24
- About This Chapter 24
- Terminal Module Configuration 24
- Bridge Selection 25
- Voltage Terminals 25
- Wiring a Terminal Module 27
- Strain Gage Wiring Diagrams 28
- 1/4 Bridge Diagrams 29
- 1/2 Bridge Diagrams 30
- Full Bridge 31
- Diagrams 31
- Connecting Relay 32
- Multiplexers to an 32
- External Voltmeter 32
- Connecting FET 33
- Chapter 3 34
- Dynamic Strain Measurements 38
- Rosette Measurements 40
- DISP "" 42
- Continued on Next Page 45
- Comments 48
- • This program makes 48
- Chapter 4 50
- Making Strain Measurements 50
- Unbalanced Bridge 51
- Measurement 51
- Technique 51
- Downloaded 52
- Unstrained 52
- References 52
- Equations 53
- Block Diagram 54
- Description 54
- The Wheatstone 55
- 120Ω and 350Ω 56
- MULTIMETER 57
- (VIA ANALOG BUS) 57
- Figure 4-7. The Wagner Ground 58
- 1/4 Bridge 59
- Measurements 59
- (QUARter) 59
- 1/2 Bridge 60
- Poisson 1/2 Bridge 61
- (HPOisson) 61
- Dummy Gage 61
- Bridge (FBPoisson) 63
- Bending Poisson Full 63
- Poisson Full Bridge 64
- (FPOisson) 64
- Reference 66
- SCPI Command Reference 68
- Numeric 1 - 32767 70
- CALibration 71
- CONFigure 72
- Numeric 1 - 99 74
- Boolean 0 75
- INITiate 76
- Subsystem Syntax MEASure 78
- [ROUTe:] 81
- Numeric cc00 - cc15 83
- Discrete NONE 86
- Discrete ABUS 87
- [SENSe:] 89
- Numeric as measured 91
- Numeric 00 - 07 91
- Numeric 1 to 32768 92
- Numeric 1 to 99 93
- Numeric 1 to 99 94
- Example Query Trigger Source 98
- IEEE 488.2 Common Commands 99
- Command Quick Reference 100
- Specifications 102
- Relay Life 104
- Appendix B 106
- Material Tables 107
- Strain Gage Diagnostics 108
- Leadwire Resistance 109
- Internal Half Bridge Voltage 112
- Shunt Verification 114
- Procedure 116
- Guard Voltage 117
- !Print the guard voltage 118
- Bridge Excitation Voltage 119
- Appendix D 120
- About This Appendix 120
- Register Addressing 121
- A16 Address Space 123
- Inside the 123
- Command Module 123
- Register Descriptions 124
- Relay Multiplexer Registers 124
- Device Type 125
- Register 125
- FET Multiplexer Registers 127
- Scan Control 129
- Scan Channel 129
- Delay Register 129
- The WRITE 130
- Registers 130
- Configuration 132
- Direct Channel 133
- Direct Control 133
- Programming Examples 134
- Reading the Device 135
- Type Register 135
- Appendix E 138
- 149
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