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3-42
IM DR232-01E
Step 2 : Change the position of the noise source.
A) Leakage magnetic flux of transformer:
Φ = strong
Φ = weak
Move the instrument to a location
where the influence from magnetic
flux is weak.
B) Sparks
strong electromagnetic
radiation
weak electrogmagnetic
radiation
Move the instrument to a location
where the influence from electro-
magnetic radiation is weak.
spark
• Grounding: a decrease of impedance
The grounding method is the point of common mode noise suppression.
Equipment
under
measurement
(EUM)
The instrument
ec ec'
EUM The instrument EUM The instrument
(if grounding is difficult)
or
The difference in the potential to the ground between EUM
and the instrument may cause a ground current, resulting in noise.
Equalize the potentials to the ground so
that the common mode noise becomes zero.
One-point grounding Potential equalization
The basic means to obtain stable measurement is to set the circuit potential with proper
grounding. Thus, potential equalization is the means to be adopted only when grounding is
impossible.
3.11 Countering Noise
- Instruction 1
- DR232/DR242 1
- Hybrid Recorder 1
- (Expandable Type) 1
- Foreword 2
- Trademarks 2
- Revisions 2
- Main Unit DR232/DR242 4
- Subunit DS400/DS600 4
- Input Modules 5
- Standard Accessories 6
- Optional Accessories 7
- Optional Software 7
- How to Use this Manual 9
- IM DR232-01E 10
- Contents 11
- Chapter 14 Specifications 13
- List of Menus and Set-up Data 14
- Computation Settings 15
- Perform Printing 15
- Other Settings 15
- 1.1 About DARWIN 16
- 1.2 Product Overview 17
- Connection example 18
- 1.3 Names of Parts 19
- System Configuration 20
- 1.3 Names of Parts 20
- Subunit DS400 21
- Subunit DS600 21
- Input modules 21
- Wire clip 22
- Clamp terminal 22
- Pulse input module (DU600-11) 23
- I/O Terminal Modules 24
- Communication Module 24
- Extender Module/Extender Base 25
- 1.4 Floppy Disk 26
- 2.1 Display Functions 27
- Input Type 29
- Skipping Input Channels 29
- Scan Interval 30
- A/D Integration Time 30
- Input Filter 30
- 2.3 Recording Functions 31
- Recording Example 32
- Recording Format 33
- Recording Colors 34
- Recording Interval 34
- Recording Span 35
- Starting/Stopping Recording 35
- Recording Zone 35
- Scale Values 35
- Partially Expanded Recording 36
- Interpolation Function 36
- List Printout 37
- Manual Printout 38
- Header Printout 38
- Additional Printouts 38
- Set-Up List Printout 38
- Match Time Function 38
- 2.4 Alarm Function 39
- Alarm status 40
- Operation of 40
- Internal switch/ 40
- 001 H 10.000mV 41
- Left span:-2V 42
- (=left scale:-0.1A) 42
- Right span:2V 42
- (=Right scale:1.1A) 42
- 2.6 Other Functions 43
- NO C NC NO CNC NO C NC 44
- Safety Precautions 46
- General Handling Precautions 46
- 3.2 How to Install 47
- Rack Mounting Dementions 48
- Panel cutting dimensions 49
- M4 screws 50
- • Rack mounting 51
- 3.2 How to Install 51
- Connecting Method 52
- Modules Which Can be Used 52
- Install the chart 54
- Loading the Ribbon Cassette 56
- Red lever 1 57
- Red lever 2 57
- Ribbon cassette holder 57
- Ferrite core 59
- RS-232-C 60
- RS-422-A/RS-485 61
- Ethernet 63
- Extension Cables 64
- Connecting Procedure 64
- W WARNING 65
- Terminals 67
- Wiring Diagram 67
- Installation and Wiring 70
- • Four-gauge method 70
- Installing an Extension Base 73
- Power ON/OFF 75
- DC power terminal 77
- DC power 77
- Switching the Power ON/OFF 79
- SET=CLOCK 80
- 3.11 Countering Noise 81
- Propagation of Noise 82
- Frequency (Hz) 85
- Signal lines* 86
- Φ = strong 87
- Φ = weak 87
- The instrument 89
- 4.1 Using the AUTO Display 91
- V0.0467 H d 92
- 004d L 0.0926V 005 0.0824V 93
- 4.2 Using the MANUAL Display 94
- 4.3 Using the PAGE Display 96
- 003 0.0054V 004 0.0319V 97
- 004 H 0.0269V 005 RH 0.0248V 97
- 005 0.2108V 006 0.0951V 97
- - 1.5000> < 2.0000 99
- 004 0.0153V 005 0.0123V 99
- Sub-display 1 and 2 100
- 005 0.8210V 006 0.0095V 103
- Dec. 30. 95 13:16:19 103
- 001-10:VOLT/2V 104
- 001-10:SCL:VOLT/2V 107
- _ _ _ _ _ _ 108
- From the previous page 108
- Monitoring Channel 109
- Strain Input Channel 113
- 001-01:PULSE/RATE 116
- SET=SYSTEM 118
- 6.2 Setting the Chart Speed 121
- Expanded Recording 123
- Printout 125
- SET=ALARM_PR 127
- SET=SCALE_PR 129
- SET=MESSAGE 131
- Interpolation and Groups 133
- Printing in Logging Mode 135
- Header Printing 136
- 7.3 Starting Message Printing 137
- 7.4 Printing Set-up Lists 138
- 001–01:1/OFF 139
- SET=LOGIC 143
- To the next page 144
- From the following page 144
- To the previous page 144
- ACT=LEVL/REPORT 146
- Reset here 153
- Not reset 153
- Computed value 153
- Start computing Event 153
- 9.2 Copying 154
- TIMER_RESET 156
- ALM_BUF_CLEAR 158
- Signal Input 160
- 9.6 Summer/Winter Time 161
- SETUP=PRN_ADJ 162
- 10.2 Setting Recording Format 164
- SETUP=ALARM 168
- SETUP=RELAY 170
- Compensation 173
- 10.6 Setting Recording Colors 175
- 10.7 Setting Key Lock 176
- 10.8 Setting FUNC/FUNC3 Menu 178
- 10.8 Setting FUNC/FUNC3 Menu 179
- 10.9 Setting SET/SET3 Menu 181
- PANEL:MANUAL PR 182
- MANUAL PR=SET3 182
- PANEL:ALARM PR 182
- ALARM PR=SET3 182
- From previous page 183
- To previous page 183
- Terminating SET UP Menu 185
- °C or °F 186
- SETUP=REPORT 188
- (Main menu item) 189
- (Submenu items) 189
- SET=MEMORY 197
- (Main menu) 198
- Trigger (event) 200
- Data length (100%) 200
- MODEL=EXPANDABLE 204
- CHANNEL=201–60 204
- 11.3 Saving Set-up Data 205
- SETUP=FLOPY 206
- 11.4 Reading Set-up Data 207
- SETUP=FLOPPY 208
- 11.5 Copying a Data File 210
- 11.6 Copying in ASCII Format 212
- 11.7 Deleting a Data File 215
- SET=FLOPPY 219
- Relational operators 221
- Executing Computation 221
- Logical operators 221
- SET=MATH 224
- 12.3 Setting a Constant 227
- Computed data 228
- Stop Clear/start 228
- TLOG SUM 232
- Replacement Period 234
- 13.2 Replacing the Fuse 235
- 13.3 Troubleshooting 236
- 13.4 Error Codes 237
- Trouble-shooting 238
- 13.4 Error Codes 238
- 13.5 Calibration 239
- DC Voltage Generator 240
- Input terminal 240
- ADJUST MODE=DISPLAY 243
- 20mV ZERO=– 1 243
- * * * DISPLAY END * * * 243
- ADJUST MODE=END 244
- A/D ADJUST END=ABORT 244
- Available Modules 246
- Recording 246
- Data Save/Load Function 249
- Optional Math Function 250
- 5 or higher) 251
- Communication Function 253
- Power Supply 253
- Normal Operating Conditions 253
- General Specifications 254
- DU300-11 10 Screw 0.5 s 259
- DU300-12 10 Clamp 0.5 s 259
- Ranges of Indication 263
- 14.8 Alarm Module 271
- 14.9 DI/DO Module 272
- Ethernet Style number: S8 276
- Extension Base 277
- 14.12 Dimensional Drawings 278
- Rear Panel 279
- Sub-unit DS600 280
- Sub-unit DS400 280
- Power Monitor Module 282
- Pulse Input Module 283
- Digital Input Module 283
- DI/DO module/Alarm module 284
- GP-IB module 284
- RS-232-C module 284
- RS-422-A/RS-485 module 285
- Ethernet module 285
- Specifications 286
- Main Menu 287
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