30-39
Waveform Commands
DATA? Example for Digital Channels
When you calibrate your Infiniium, the input to each channel, in turn, is
connected to the Aux Out connector. The Aux Out is connected to a 16-bit
digital-to-analog convertor (DAC) whose input is controlled by Infiniium’s CPU.
There are 65,536 dc voltage levels that are produced by the 16-bit DAC at the
Aux Out. At each dc voltage value, the output of the ADC is checked to see if
a new digital code is produced. When this happens, a 16-bit correction factor
is calculated for that digital code and this correction factor is stored in a
Calibration Look-up Table.
Figure 30-3
Data Flow in Infiniium
This process continues until all 256 digital codes are calibrated. The calibration
process removes most of the non-linearity error of the ADC which yields more
accurate vertical voltage values.
During normal operation of the oscilloscope, the output of the ADC is used as
an address to the Calibration Look-up Table which produces 16-bit data for the
oscilloscope to process and display. The output of the ADC is a signed 8-bit
integer and the output of the Calibration Look-up Table is a signed 16-bit integer.
If the amplitude of the input waveform is larger than the maximum dc reference
level of the ADC, the ADC will output the maximum 8-bit value that it can (255).
This condition is called ADC clipping. When the 255 digital code is applied to
the Calibration Look-up Table, a 16-bit value, such as 26,188 could be produced
which represents an ADC clipped value. This number will vary from one
oscilloscope to the next.
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
Calibration
Digital
to
Analog
Converter
CPU
Aux Out
Channel In
Analog
to
Digital
Converter
Calibration
Look-up
Table
16 bits
16 bits
16 bits
8 bits
ASCII
Format
WORD
Format
BYTE
Format
Stream of
8 bit
Characters
Summary of Contents for Infiniium 8000A
Page 1: ...Agilent Technologies Infiniium 8000A Programmer s Reference ...
Page 2: ......
Page 20: ...Contents 16 ...
Page 21: ...1 Introduction to Programming ...
Page 43: ...2 LAN and GPIB Interfaces ...
Page 53: ...3 Message Communication and System Functions ...
Page 58: ...3 6 ...
Page 59: ...4 Status Reporting ...
Page 78: ...4 20 Figure 4 3 Status Reporting Decision Chart ...
Page 79: ...5 Programming Conventions ...
Page 84: ...5 6 Programming Conventions The Command Tree Figure 5 1 Command Tree ...
Page 85: ...5 7 Programming Conventions The Command Tree Figure 5 2 Command Tree Continued ...
Page 86: ...5 8 Programming Conventions The Command Tree Figure 5 3 Command Tree Continued ...
Page 87: ...5 9 Programming Conventions The Command Tree Figure 5 4 Command Tree Continued ...
Page 88: ...5 10 Programming Conventions The Command Tree Figure 5 5 Command Tree Continued ...
Page 89: ...5 11 Programming Conventions The Command Tree Figure 5 6 Command Tree Continued ...
Page 94: ...5 16 ...
Page 95: ...6 Sample Programs ...
Page 149: ...7 Acquire Commands ...
Page 176: ...7 28 Acquire Commands SRATe AUTO ...
Page 177: ...8 Bus Commands ...
Page 187: ...9 Calibration Commands ...
Page 195: ...10 Channel Commands ...
Page 223: ...11 Common Commands ...
Page 247: ...12 Digital Commands ...
Page 254: ...12 8 ...
Page 255: ...13 Disk Commands ...
Page 300: ...13 46 Disk Commands STORe Obsolete ...
Page 301: ...14 Display Commands ...
Page 322: ...14 22 ...
Page 323: ...15 External Trigger Commands ...
Page 343: ...16 Function Commands ...
Page 382: ...16 40 ...
Page 383: ...17 Hardcopy Commands ...
Page 391: ...18 Histogram Commands ...
Page 403: ...19 InfiniiScan ISCan Commands ...
Page 421: ...20 Limit Test Commands ...
Page 429: ...21 Marker Commands ...
Page 452: ...21 24 ...
Page 453: ...22 Mask Test Commands ...
Page 499: ...23 Measure Commands ...
Page 636: ...23 138 Measure Commands VUPPer ...
Page 637: ...24 Pod Commands ...
Page 642: ...24 6 ...
Page 643: ...25 Root Level Commands ...
Page 645: ...25 3 STORe SETup STORe WAVeform TER Trigger Event Register VIEW ...
Page 674: ...25 32 ...
Page 675: ...26 Self Test Commands ...
Page 679: ...27 System Commands ...
Page 694: ...27 16 ...
Page 695: ...28 Time Base Commands ...
Page 708: ...28 14 ...
Page 709: ...29 Trigger Commands ...
Page 822: ...29 114 ...
Page 823: ...30 Waveform Commands ...
Page 893: ...31 Waveform Memory Commands ...
Page 902: ...31 10 ...
Page 903: ...32 Error Messages ...
Page 914: ...32 12 ...