Measurement-computing DAC488 v.1 Manuel d'utilisateur Page 48
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42 DAC488 Calibration DAC488 User’s Manual
Manual Calibration Procedure
Part I: Connections & Preparations
1. Connect the DAC488 to the IEEE controller using an IEEE 488 cable.
2. Connect the negative input of the voltmeter to the Port 1 L (Low) output.
3. Connect the positive input of the voltmeter to the Port 1 H (High) output.
4. Set the IEEE bus address of the DAC488 to 9.
5. Turn the DAC488 on, and allow it to warm up for at least one hour before beginning the calibration
procedure.
Part II: Acquiring the Gain Calibration Constants
1. After the DAC488 has warmed up for at least one hour, initialize the DAC488 by sending an IEEE 488
Interface Clear (
IFC). Command sent to the DAC488:
CLEAR 09
2. Select Port 1, Direct Control Mode, Autoranging disabled, select the +10 volt range, set the Offset to 0,
set the Positive and Negative Gain constants to 128, program the port to output 0 volts. Command sent
to the DAC488:
OUTPUT 09; P1 C0 A0 R3 H0 J128,128 V0 X
3. Measure and record the port 1 output voltage. Call this voltage ZVAL.
4. Program the DAC488 port 1 to output 10 volts. Command sent to the DAC488:
OUTPUT 09; V10 X
5.
Measure and record the port 1 output voltage. Call this voltage PVAL.
6. Program the DAC488 port 1 to output -10 volts. Command sent to the DAC488:
OUTPUT 09; V-10 X
7. Measure and record the port 1 output voltage. Call this voltage NVAL.
8. Set the Positive and Negative Gain constants to maximum (255) and program the port to output 10
volts. Command sent to the DAC488:
OUTPUT 09; J255,255 V10 X
9. Measure and record the port 1 output voltage. Call this voltage MVAL.
10. Set the Positive and Negative Gain constants to minimum (0) and program the port to output 10 volts.
Command sent to the DAC488:
OUTPUT 09; J0,0 V10 X
11.
Measure and record the port 1 output voltage. Call this voltage NOVAL.
12. The Gain Calibration Constants are computed using the following formulas:
• Gain adjustment per bit = (
MVAL - NOVAL) / 256
• Pos. Error (in volts) =
PVAL - ZVAL - 10
• Pos. Gain Calibration Constant = (128 - Pos. Error) / Gain adjust per bit
• Neg. Error (in volts) =
NVAL - ZVAL - 10
• Neg. Gain Calibration Constant = (128 + Neg. Error) / Gain adjust per bit
13.
Once the Gain Calibration Constants have been computed, the positive and negative gains should be set
to these new values. This can be done using the Gain Calibration (
J) command. For example, if the
positive and negative Gain Calibration Constants are 131 and 148 respectively, the command
J131,148 X should be sent to the DAC488.
- User's Manual 1
- Introduction to this Manual 3
- Table of Contents 4
- 7 - DAC488 Commands 5
- 8 - Troubleshooting 5
- A - Appendix 5
- DAC488 Overview 1 7
- Accessories 8
- Specifications 8
- DAC488 Setup 2 11
- Hardware Setup 12
- Default Settings 13
- Mode Selection 13
- Analog Output Ports 13
- Digital I/O Port 14
- DAC488 Power & Assembly 3 19
- Rack Mount 23
- Bench Top 23
- Power-Up Activation 24
- CAUTIONCAUTION 24
- Programming Examples 25
- Performance Verification 26
- DAC488 Operation 4 29
- Port Triggering 30
- Internal Buffer 32
- Control Modes 34
- Waveform Control Mode 35
- Multiple Port Synchronization 36
- User-Defined System Defaults 39
- IEEE 488 Bus Support 39
- Bus Commands 40
- Bus Addresses 40
- Bus Terminators 40
- IEEE 488 Background 5 41
- Bus Lines & Bus Commands 42
- Handshake Lines 43
- Data Transfer Lines 43
- Bus Command Groups 44
- More On Service Requests 45
- DAC488 Calibration 6 47
- Manual Calibration Procedure 48
- BASIC Calibration Program 49
- DAC488 Commands 7 57
- Command Groups 59
- Command Summary 60
- Command Reference 63
- @ - Trigger On Command 64
- A - Autorange 65
- B - Buffer Data 66
- C - Control Mode 67
- D - Digital Output 69
- E? - Query Error Status 70
- F - Buffer Definition 72
- G - GET Trigger Mask 73
- H - Offset Calibration 74
- I - Interval 75
- J - Gain Calibration 76
- K - End-Or-Identify Control 77
- L - Buffer Location 78
- M - Service Request Mask 79
- N - Number of Cycles 80
- O - Output Format 81
- P - Port Select 82
- Q - External Trigger Mask 83
- R - Range Select 84
- S - System Defaults 85
- T - Command Trigger Mask 86
- U - User Status 87
- V - Value Output 90
- W - Test 91
- X - Execute 92
- Y - Bus Terminator 93
- ? - Query 94
- Serial Poll Status Byte 95
- Troubleshooting 8 97
- Query Error Status 98
- Appendix A 99
- IEEE 488 Bus Commands 100
- ASCII Codes 101
- ASCII Code Details 103
- Decimal Values 32 to 63 – LAG 105
- Decimal Values 64 to 95 – TAG 106
- Abbreviations 112
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