Measurement-computing DBK70 Manuel d'utilisateur Page 108
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B-4 Scale & Offset in Summary View 937696 Appendix B
Calculating Display Scale and Offset Values
Output Channel Icons are created for all channels supported in a DBK70 when the Read Current Settings
option on the Device menu is selected. One Output Channel Icon is created for each output channel in a
DBK70. Each Icon displays the channel number associated with the channel, the first 29 or so characters of
the Record Name and Comment fields of the DBK70 Database record used to configure the channel, and a
real time display of the value of the received data. The PC Display Scale and Offset, Record Name, and
Comments fields are described in an earlier section DBK70 Database Record Fields. A PC screen with
Output Channel Icons is shown later in the section Output Channel Icons.
This section describes the calculation of the PC Display Scale and Offset values used to scale received data
for display in an Output Channel Icon.
In absolute terms, the values that can be displayed in Output Channel Icons are integers that range from
-2
31
to +2
31
.
Example 1
Create a full range display in an Output Channel Icon (i.e., 0 to 10,000) equivalent to an RPM range of 0 to
10,000 RPM, where the data received from the vehicle data bus has a resolution of 0.25 RPM/bit
(i.e., V
H
= 10,000, V
L
= 0, D
H
= 10,000 RPM, D
L
= 0 RPM, and R = 0.25 RPM/bit):
If V
H
= 10,000, V
L
= 0, D
H
= 10,000 RPM, D
L
= 0 RPM, and R = 0.25 RPM/bit
PC Display Scale = [(V
H
- V
L
) / (D
H
– D
L
)] * R
= [(10,000 – 0)/ (10,000 – 0)] * 0.25
= [10,000 / 10,000] * 0.25
= 1 * 0.25 = 0.25
PC Display Offset = [(D
L
)/(R)] * PC Display Scale
= [ 0 / 0.25]
= 0
Example 2
Create a display with a range of -330 to +300 in an Output Channel Icon that is equivalent to a temperature
range of -300 °F to +300 °F, where the data received from the vehicle data bus has a resolution of
0.125 °F /bit (i.e., V
H
= 300, V
L
= -300, D
H
= +300 °F, D
L
= -300°F, an R = 0.125 °F/bit
PC Display Scale = [(V
H
- V
L
) / (D
H
– D
L
)] * R
= [(300 – (-300)) / (+300 – (-300))] * 0.125
= [600/600] * 0.125
= 1 * 0.125
= 0.125
PC Display Offset = [(D
L
)/(R)] * PC Display Scale
= [(-300)/(0.125)] * 0.125
= -2400 * 0.125
= -300
- *372538B-01* 1
- Table of Contents 3
- (p/n 1056-0902) 4
- Unpacking the DBK70 1 5
- 919192 DBK70 User’s Manual 6
- 946898 Introduction 2-1 7
- 946898 Introduction 2-3 9
- 946898 DBK70 User’s Manual 10
- System Setup 3 11
- Configuring a DBK70 12
- Differential Measurements 13
- Single-Ended Measurements 13
- 927994 DBK70 User’s Manual 14
- 927994 System Setup 3-5 15
- 927994 System Setup 3-7 17
- Hardware Reference 4 19
- Network Port 20
- P1 Multiplexed Output Port 21
- Power Issues 22
- LED Operation 22
- [Included] 24
- [Included] 24
- [Optional] 25
- Chassis Label 27
- Card Installation 28
- Analog Output Cards 29
- 919092 DBK70 User’s Manual 30
- Contents 31
- Parsing Serial Strings 5-34 32
- Introduction 33
- Features of PidPRO 34
- Database Concepts 35
- PidPRO Quick-Start 36
- 919092 5-7 37
- PidPRO+ Only 38
- Database Management 39
- 919092 PidPRO & PidPRO+ 40
- Reference Guide 41
- Database Menu 42
- 919092 5-13 43
- Set Channel Update Rate 45
- Communications Menu 46
- Connect 46
- Set COM Port 46
- Database Item View Window 47
- Detailed View 49
- Source Channel 50
- Message Send Rate 50
- Msg 1 and Msg 2 51
- Data Length (bits) 53
- Byte Order 53
- 919092 5-25 55
- Low Limit / High Limit 56
- Units/Bit 56
- Binary Point 56
- Set to Limits (Button) 56
- Range Low / Range High 57
- Summary View 58
- PidPRO+ Only 61
- Clear Text Window 63
- Begin Monitoring 63
- Stop Monitoring 63
- Send Outgoing Message 63
- Close Monitor 63
- Parsing Serial Strings 64
- LogView 65
- General Operation 67
- 928494 DBK70 User’s Manual 68
- Example Setup from SAE J2190 72
- Using Diagnostic Data Packet 74
- Data Frame 78
- Creating a Request Message 82
- J1939 Considerations 83
- OBD CAN Considerations 84
- Supported Standards 84
- PID $00 value from vehicle 85
- (decimal) 85
- 918692 DBK70 User’s Manual 86
- Troubleshooting 8 95
- Hardware Related Steps 96
- Physical 97
- Environmental 97
- Electrical 97
- Analog Outputs 97
- Software Requirements 97
- 948796 DBK70 User’s Manual 98
- Appendix A A 99
- 919092 Appendix A 100
- Vehicle Network Interface 101
- WARNING 102
- CAUTION 102
- Preparation 102
- Replacing the Chip at U8 103
- Replacing the Chip at U9 103
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