Measurement-computing DBK Part 2 Instrukcja Użytkownika Strona 58
- Strona / 306
- Spis treści
- BOOKMARKI
Oceniono. / 5. Na podstawie oceny klientów
DBK43A & DBK43B, pg. 38 899892 DBK Option Cards and Modules
Shunt Calibration
Shunt calibration is virtually identical to the 2-Point method just discussed, except that the second point is
simulated. The simulated load is achieved by shunting one leg of the bridge with a shunt resistor. Shunt
calibration is the preferred calibration method when applying a real load (of a value approximating the
maximum expected load) is not practical. To adjust the channel gain, the shunt must be applied to the
bridge.
Calculate and install the necessary shunt resistor before continuing.
DBK43A has direct support for shunt calibration, accommodating the
resistor in its enclosure and allowing the software to apply it when requested.
DBK16 does not have direct support, so the shunt resistor must be applied
externally and switched in manually.
Adjust the Offset
1. DBK43A users: Verify that the unit’s physical switch is in the NORM position.
DBK43B users
: Verify that the unit’s physical CAL1 and CAL2 switches are both in the
RUN position.
2.
In the Param1 column, select all of the DBK43A [or DBK43B] channels that are to be
adjusted.
3.
Select Mode = Bridge from the drop down list above the grid. This selection commands the
calibration multiplexer to route the transducer voltage through the analog path.
4.
Turn off all the channels in the system except for those DBK43A [or DBK43B] channels that
are to be adjusted.
5.
Click the Download button to send the current configuration to the LogBook.
6.
Select Indicators \ Enable Input Reading Column from the menu bar to display the offset
values for each channel.
7.
For the associated channel, apply the first calibrated load to each gage (typically no-load) and
set the voltage to 0.0V for each transducer by adjusting the trimpot labeled OFFSET.
If the first point is an actual calibrated load, you must move the load to each gage, one at a
time, to adjust its associated offset.
Adjust the Input and Scale Amplifier Gain
For the best results, a gain should be selected so that the bridge’s maximum output equals 90% of the
A/D’s input range.
1. Use the following equation to calculate the desired shunt voltage (V
D
).
V
D
= (L
s
/L
M
) * V
I
* 90%
Where: V
D
= Desired voltage from the after amplification when the shunt is applied
L
s
= Simulated load produced by shunt
L
M
= Maximum load expected during usage
V
I
= Input voltage range
Example: The simulated load produced by the shunt 100lbs. The maximum expected load during
usage is 150 lbs. The programmable input range of the data acquisition system is set
for +
5V. The desired output voltage of the strain gage signal conditioning electronics
is:
V
D
= (100/150) * 5 * 0.90 = 3V
In this example, we would adjust the GAIN and SCALE trimpots until a value of 3V
is measured. If 150lbs is applied to the gage, a voltage of 4.5V will be measured.
V
D
= (150/150) * 5 * 0.90 = 4.5V
- *372414B-01* 1
- DBK Cards & Modules 3
- DBK Cards & Modules 5
- Discontinued DBKs 6
- 10-Slot Expansion Module 7
- Card Insertion 9
- DBK41 - Specifications 11
- System Connection 11
- Terminal Block Connection 15
- 967694 DBK42, pg. 5 17
- This means: m = 320 19
- DBK42 – Specifications 20
- Configuration section 22
- Hardware Connection 23
- Hardware Configuration 24
- Bridge Applications 26
- MAX[EXC] 27
- Input Configuration Headers 29
- Shunt-Calibration Resistors 29
- Hardware Adjustment 33
- Software-Controlled Setup 34
- Selecting DBK43A 42
- Calibration Methods 46
- Determine Channel Parameters 47
- Initialize LogView 47
- know [as in the 50
- See Note No 52
- Adjust the Offset 53
- 2-Point Calibration 56
- Repeating the Process 57
- Shunt Calibration 58
- )( trimpotbysetasGainInput 62
- DriftOffsetOutput 62
- DriftOffsetInput + 62
- P1 Connection 66
- 877095 DBK44, pg. 7 69
- DBK44 – Specifications 70
- 987696 DBK45, pg. 3 73
- DBK45 – Specifications 76
- 4-Channel Analog Output Card 77
- DBK46 – Specifications 80
- Description 81
- Safety Concerns 82
- Installing 8B Modules 84
- 967792 DKB48, pg. 11 91
- This means: m = 320 95
- Therefore: b = - 160 95
- Specifications – DBK48 96
- 8B Module Ranges 97
- 967792 DKB48, pg. 19 99
- Overview 101
- Hardware Setup 102
- DAC 1 - INT 103
- Software Setup 104
- Single-Ended Mode 107
- Module Connection 107
- Module Configuration 107
- 989594 DBK55, pg. 1 111
- Input Signal Conditioning 113
- WARNING 113
- CAUTION 114
- Edge Selection 114
- Debouncing 114
- Frequency Measurement 115
- 988793 DBK55, pg. 7 117
- CE Compliance 120
- Specifications - DBK55 122
- 3 – Remove the card drawer 125
- 8 – Configure the DBK cards 127
- 9 – Install the DBK cards 127
- DBK60 - Specifications 128
- DBK65 Power Requirements 130
- DBK65 Voltage Regulation 130
- Customizing a Voltage 132
- Source Resistance in Ohms 134
- These jumpers do 136
- Series Devices 136
- 988793 DBK65 pg. 11 139
- DBK65 Specifications 140
- 988793 DBK65 pg. 13 141
- Vehicle Network Interface 143
- 989494 DBK80 pg. 3 147
- Card Configuration 148
- These jumpers do not 149
- Devices 149
- DBK80 - Specifications 150
- Open Thermocouple Detection 153
- POD-1 Dimensions 155
- TC Accuracy 159
- 989494 DBK84 pg. 7 167
- DBK84 - Specifications 168
- CE Compliance …… 4 169
- Specifications – DBK85 174
- 907492 DBK90 pg. 1 175
- 907492 DBK90 pg. 5 179
- 907492 DBK90 pg. 7 181
- 907492 DBK90 pg. 9 183
- Shielding 184
- TC Common Mode 184
- DBK90 – Specifications 187
- Description Part No 188
- DBK101 Hub Configuration 195
- TC Common Mode 198
- DaqBook/2000 Series Users: 205
- P4-to-P1 / P2 / P3 Adapters 207
- Screw-Terminal Adapter Board 209
- Connection Tips 210
- Using Screw-Terminal Blocks 212
- Using the P3 Header 217
- Connections 222
- P4-to-P1/P2/P3 Adapter Board 223
- 987594 DBK206, pg. 3 225
- 987594 DBK206, pg. 5 227
- 5B Carrier Boards 229
- Warnings, Cautions, and Tips 231
- External Ground Connection 232
- Channel Configuration 233
- 5B Module Connection 233
- DBK208 Relay Carrier Board 237
- DBK208, pg. 4 240
- External Power Watchdog 241
- Operation 241
- Switch Settings 244
- For Digital Output 244
- For Digital Input 244
- DBK208 – Specifications 245
- DBK208, pg. 10 246
- 909094 DBK209, pg. 3 249
- DBK209, pg. 4 250
- 987594 DBK210, pg. 3 253
- 987594 DBK210, pg. 5 255
- DBK210, pg. 6 256
- DBK210, pg. 8 258
- DaqView’s Channel Setup Tab 259
- In the above figure t 259
- DBK210 – Specifications 260
- Installing DBK Cards 263
- System Examples 264
- Example 2: 265
- 969294 DBK213, pg. 7 267
- 969294 DBK213, pg. 9 269
- 969294 DBK213, pg. 11 271
- Specifications for DBK213 272
- 969294 DBK213, pg. 13 273
- DBK213, pg. 14 274
- DBK214, pg. 2 276
- 279
- DBK214, pg. 6 280
- [2 Screws per-side] 280
- 967894 DBK214, pg. 7 281
- 967894 DBK214, pg. 9 283
- 967894 DBK214, pg. 11 285
- 967894 DBK214, pg. 13 287
- Specifications for DBK214 288
- 967894 DBK214, pg. 15 289
- DBK214, pg. 16 290
- DBK215, pg. 2 292
- System Example 294
- 897994 DBK215 pg. 7 297
- 897994 DBK215 pg. 9 299
- DBK215, pg. 12 302
- Specifications for DBK215 303
- DBK215, pg. 14 304
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