Specifications

Chapter 3
Making Strain Gage Measurements
About This Chapter
This chapter contains example programs which make strain gage
measurements with various bridge configurations. The examples in this
chapter include:
• Single-Channel
1
⁄
4
Bridge Measurements . . . . . . . . . . . . . . . Page 35
• Multi-Channel
1
⁄
4
Bridge Measurements. . . . . . . . . . . . . . . . Page 36
• Dynamic Strain Measurements . . . . . . . . . . . . . . . . . . . . . . . Page 37
• Rosette Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 39
• Single-Channel Bending Full Bridge
Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 40
• Relay Strain Gage Measurements with an External
Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 41
• FET Strain Gage Measurements with an External
Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 43
• Measurements with Downloaded Unstrained
References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 46
Using the Example
Programs
The purpose of the chapter is to provide example programs that show you
how to make strain gage measurements, and to provide programs that can be
used directly in your applications.
Programming
Language
The example programs are shown in the HP BASIC language and assume
the multimeter is controlled from an HP 9000 Series 300 computer over the
HP-IB.
When using HP BASIC, a command is sent to the scanning multimeter
instrument with the
OUTPUT statement:
OUTPUT 70903;"MEAS:STR:QUAR? (@100)"
The destination specified (70903) is the interface select code of the
computer (
7), plus the HP-IB addresses of the HP 75000 Series B
mainframe or Series C command module (
09), plus the multimeter
instrument address (
03). The multimeter command is enclosed between
quotation marks.
Data from the multimeter instrument is entered into the computer using the
ENTER statement:
ENTER 70903;variable
Chapter 3 Making Strain Gage Measurements 33
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