Specifications

CR3000 Table of Contents
2. Data Storage and Retrieval......................................2-1
2.1 Data Storage in CR3000 ....................................................................... 2-1
2.1.1 Internal SRAM............................................................................ 2-1
2.1.2 CFM100 or NL115...................................................................... 2-1
2.2 Internal Data Format............................................................................. 2-2
2.3 Data Collection..................................................................................... 2-3
2.3.1 Via a Communications Link ....................................................... 2-4
2.3.2 Via CF Card ................................................................................ 2-4
2.3.2.1 Inserting a CF Card ........................................................... 2-4
2.3.2.2 Removing Card from CR3000........................................... 2-5
2.3.2.3. Converting File Format .................................................... 2-5
2.4 Data Format on Computer .................................................................... 2-5
2.4.1 Header Information..................................................................... 2-5
2.4.2 TOA5 ASCII File Format ........................................................... 2-7
2.4.3 TOB1 Binary File Format........................................................... 2-7
2.4.4 TOB3 Binary File Format........................................................... 2-8
3. CR3000 Measurement Details..................................3-1
3.1 Analog Voltage Measurement Sequence.............................................. 3-1
3.1.1 Voltage Range............................................................................. 3-1
3.1.2 Reversing Excitation or the Differential Input............................ 3-3
3.1.3 Measuring Single-Ended Offset.................................................. 3-3
3.1.4 SettlingTime................................................................................ 3-3
3.1.5 Integration................................................................................... 3-4
3.2 Single Ended and Differential Voltage Measurements......................... 3-4
3.3 Signal Settling Time ............................................................................. 3-6
3.3.1 Minimizing Settling Errors ......................................................... 3-6
3.3.2 Measuring the Necessary Settling Time...................................... 3-7
3.4 Thermocouple Measurements............................................................... 3-8
3.4.1 Error Analysis ............................................................................. 3-9
3.4.2 Use of External Reference Junction or Junction Box................ 3-16
3.5 Bridge Resistance Measurements ....................................................... 3-17
3.6 Measurements Requiring AC Excitation ............................................ 3-19
3.7 Pulse Count Measurements................................................................. 3-20
3.8 Self Calibration................................................................................... 3-21
3.9 Measurement Accuracy ...................................................................... 3-22
4. CRBASIC - Native Language Programming ...........4-1
4.1 Format Introduction.............................................................................. 4-1
4.1.1 Mathematical Operations ............................................................ 4-1
4.1.2 Measurement and Output Processing Instructions...................... 4-1
4.1.3 Inserting Comments Into Program.............................................. 4-2
4.2 Programming Sequence........................................................................ 4-2
4.3 Example Program ................................................................................. 4-4
4.3.1 Data Tables ................................................................................. 4-4
4.3.2 The Scan -- Measurement Timing and Processing...................... 4-6
4.4 Variable Data Types ............................................................................. 4-7
4.4.1 FLOAT........................................................................................ 4-7
4.4.2 LONG ......................................................................................... 4-7
4.4.3 BOOLEAN ................................................................................. 4-7
4.4.4 STRING...................................................................................... 4-7
4.4.5 Numerical Expressions with Floats, Longs and Booleans .......... 4-8
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