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To make a more accurate measurement, the copper test leads of the
meter should be extended closer to the measurement and the connections
to the thermocouple be held at the same temperature.
This circuit will give accurate temperature measurements. However, it is
not very convenient to make two thermocouple connections and keep all
connections at a known temperature. The "Law of Intermediate Metals"
eliminates the need for the extra connection. This empirical law states
that a third metal (iron (Fe) in the example) inserted between two
dissimilar metals will have no effect upon the output voltage provided the
junctions formed are at the same temperature. Removing the reference
thermocouple makes the connections much easier.
This circuit is the best solution for accurate thermocouple connections.
MEASUREMENT
THERMOCOUPLE
Meter
Ice Bath
Meter
Ice Bath
REFERENCE THERMOCOUPLE
7
Chapter 7 Measurement Tutorial
Measurement Techniques and Sources of Error
267
- Agilent 34420A 3
- The Front-Panel at a Glance 4
- Display Annunciators 6
- The Rear Panel at a Glance 7
- In This Book 8
- Contents 12
- Quick Start 13
- To Prepare the Meter For Use 15
- If the Meter Does Not Turn On 16
- 250 mAT fuse 17
- To Adjust the Carrying Handle 18
- To Make Input Connections 19
- Earth Ground (shell) 20
- To Measure Voltage 21
- To Measure Resistance 22
- EXTERNAL 24
- FIXED VALUE 24
- INTERNAL 24
- To Select a Range 25
- To Set the Number of Digits 26
- To Set the Integration Time 27
- Front-Panel Display Formats 28
- To Rack Mount the Meter 29
- Front-Panel Operation 31
- Front-Panel Menu Reference 33
- Ø6:CAL COUNT Ø 7:MESSAGE 34
- A Front-Panel Menu Tutorial 35
- On/Off 37
- A: , B: , etc.) 37
- 1: , 2: , etc.) 38
- Recall 39
- On/Off 40
- NULL VALUE parameter 41
- Null 42
- To Select an Input Channel 43
- < or > 48
- To Trigger the Meter 49
- * (sample) annunciator is on 49
- To Use Reading Hold 50
- (Ch 1 voltage − Ch 1 Null ) 51
- To Use Reading Memory 52
- Features and Functions 55
- Input Filters 57
- Ø ANALOG Ø ANA + DIG 57
- Enter to enable the 58
- Integration Time 60
- Reducing Measurement Noise 62
- Number of Digits Displayed 64
- Sets the 10 Volt DC range 66
- Sets the 1 mV DC range 66
- Sets auto ranging on 66
- 2-wire resistance 66
- Overload Detection 67
- Input Channels 68
- − Ch 1 Null ) 69
- Measurement Units 73
- RTD Measurements 74
- Thermistor Measurements 74
- Thermocouple Measurements 75
- Math Operations 76
- Null (Relative) Operation 79
- Reading Hold 81
- Trigger Source Choices 84
- ‘Trig’ annunciator turns on 85
- Number of Samples 88
- Number of Triggers 88
- Trigger Delay 89
- ∨ until 90
- Enter 90
- Automatic Trigger Delays 91
- System-Related Operations 92
- Error Conditions 94
- Self-Test 95
- Display Control 96
- Comma Separators 97
- Firmware Revision Query 97
- SCPI Language Version 98
- Voltmeter Complete Terminal 99
- External Trigger Terminal 99
- chart output voltage 100
- = 0.001 100
- Chart Rollover 102
- Remote Interface Selection 103
- HP-IB Address 104
- Parity Selection (RS-232) 106
- Calibration 109
- Calibration Count 112
- Calibration Message 113
- or MEASure commands 114
- are enabled 116
- 100 mV ranges 116
- Remote Interface Reference 117
- Command Summary 119
- Status Reporting Commands 125
- Calibration Commands 126
- Remote Interface Commands 126
- IEEE-488.2 Common Commands 127
- <function> 129
- Using the MEASure? Command 130
- Using the CONFigure Command 130
- Using the READ? Command 132
- Selecting the Input Channel 142
- Null (Relative) Commands 147
- Input Filter Commands 148
- Math Operation Commands 150
- Scale operation commands 152
- First time SCPI users 153
- Triggering 154
- The Wait-for-Trigger State 155
- Triggering Commands 156
- System-Related Commands 159
- The SCPI Status Model 161
- SCPI Status System 162
- The Status Byte 163
- IEEE-488 bus 165
- IEEE-488 SRQ interrupt 165
- The Standard Event Register 167
- *PSC {0 175
- *SRE <enable value> 175
- CALibration:STRing? 177
- CALibration:VALue? 177
- RS-232 Configuration Overview 178
- RS-232 Data Frame Format 179
- Connection to a Printer 181
- DTR / DSR Handshake Protocol 181
- RS-232 Troubleshooting 183
- RS-232 Interface Commands 184
- SCPI) defines how 185
- IEEE-488.2 interface 186
- SCPI Data Types 187
- Input Message Terminators 188
- Output Data Formats 188
- TALK ONLY for Printers 189
- To Set the HP-IB Address 190
- To Set the Baud Rate 192
- To Set the Parity 193
- (Keithley 181) 194
- Specific Issues 195
- SCPI Compliance Information 196
- Messages 200
- Error Messages 201
- Execution Errors 202
- SEC is not a valid suffix) 203
- BUS and a READ? 204
- INTERRUPTED 206
- UNTERMINATED 206
- DEADLOCKED 206
- Self-Test Errors 209
- Calibration Errors 211
- Application 213
- Programs 213
- Application Programs 214
- HP BASIC Language Programs 215
- ... continued 217
- Agilent Control Libraries 224
- C Language Programs 231
- C / HP-IB Example 1 233
- C / HP-IB Example 2 235
- C / HP-IB Program Example 3 239
- Microsoft Excel Macro Example 243
- Macro Comments 244
- Measurement Tutorial 247
- Voltage Measurements 249
- Resistance Measurements 258
- ) − V 259
- 1 mA 10 mV 20, 100, or 500 mV 261
- Temperature Measurements 263
- Ice Bath 266
- N/A = Not Available 269
- Input Connector 272
- Part NumberDescription 273
- Specifications 274
- Chapter 8 Specifications 275
- MEASUREMENT CHARACTERISTICS 276
- OPERATING CHARACTERISTICS 277
- Dimensions 279
- Sensitivity 284
- Resolution 285
- Accuracy 285
- 24-Hour Accuracy 286
- 90-Day and 1-Year Accuracy 286
- Temperature Coefficients 286
- DECLARATION OF CONFORMITY 293
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