CompuScope SDK Manua.. - Egmont Instruments

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Example:Below is illustrated a typical example that might be used to set the CompuScope 85G. As you can see, therequested sample rate is 5 GS/s, the requested input range is ± 2 Volts etc.extern boarddef board;extern srtype far sample_rate_table[];board.opmode = GAGE_SINGLE_CHAN;board.srindex = SRTI_5_GHZ;board.range_a = GAGE_PM_2_V;board.range_e = GAGE_PM_1_V;board.couple_a = GAGE_DC;board.couple_e = GAGE_DC;board.imped_a = GAGE_50_OHM_INPUT;board.source = GAGE_CHAN_A;board.slope = GAGE_POSITIVE;board.depth = GAGE_POST_4K;board.level = 128;To actually implement these settings, the programmer can simply call the SetBoard() routine that resides inapp_supp.c .Page 68 Appendix A CompuScope SDK Manual
Appendix B: CompuScopePower ManagementIn order to avoid unnecessary wear on A/D circuitry, some CompuScope models are able to power downA/D circuitry when it is not in use. For higher speed CompuScope models such as the CompuScope 8500and CompuScope 82G, the software drivers configure the hardware in automatic power control mode. Inthis mode, the A/D circuitry power is automatically turned ON before an acquisition is performed and isturned OFF afterwards.Toggling the state of the A/D circuitry power takes milliseconds to implement. This can have seriousconsequences for the acquisition of rapidly repeating triggers. For such rapid repetitive acquisitions, itmakes no sense to turn the power OFF and ON between acquisitions and the maximum achievable recordacquisition rate may be seriously comprised. For customers who want to override automatic power controlmode for a high speed CompuScope like the CS8500 or CS85G, Gage has provided thegage_power_control subroutine, which is described below.The gage_power_control subroutine takes a control argument that can take three possible values, eachwith a defined constant, whose effect is listed belowGAGE_POWER_ON – This argument turns power to the ADC circuitry ON and leaves it ONGAGE_POWER_OFF - This argument turns power to the ADC circuitry OFF and leaves it OFFGAGE_POWER_AUTO_MASK – This argument is used to place a CompuScope in automatic powercontrol mode. In this mode, ADC circuitry power is automatically turn ON before acquisition internally bythe gage_start_capture subroutine. Once the acquisition has been performed and the on-board addresseshave been calculated, the power is turned OFF automatically when the user calls gage_need_ram(TRUE)before downloading the acquired data.For most CompuScopes, where thermal wear is not an issue, the gage_power_control argument isautomatically set to GAGE_POWER_ON during initialization, so that the ADC circuitry power is alwaysON. For higher speed CompuScopes, like theCS8500 and CS82G, the gage_power_control argument isautomatically set to GAGE_POWER_AUTO_MASK during initialization. This ensures that ADCcircuitry power is only ON when necessary and the CompuScope does not sit consuming full power whileit is idle.The process of overriding automatic power-control mode for customers who need to perform rapidacquisitions is simple. First, the programmer needs to call the gage_power_control with an argumentequal to GAGE_POWER_ON before performing multiple acquisitions. After this acquisition sequence isfinished, the user must then call gage_power_control with an argument equal toGAGE_POWER_AUTO_MASK, in order o return the CompuScope to automatic power-control mode.Failure to do so will leave ADC circuitry power ON until the driver is reinitialized, which may lead toincreased thermal wear on CompuScope ADC circuitry. By leaving the power ON throughout a multipleacquisition sequence, the user is able to achieve the fastest possible repetitive capture performance.CompuScope SDK Manual Appendix B Page 69
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Volume I:CompuScope C/C++Software D
Page 3 and 4:
Gage Applied Technologies, Inc. Sof
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Global Table of ContentsVolume I Co
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Chapter 5: Sample ProgramsWindows S
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PrefaceImportant Notes:• The Comp
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Chapter 2: BasicCompuScopeOperation
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CompuScope A/D cards generally oper
Page 18 and 19:
Multiple CompuScope SystemsThe Comp
Page 20 and 21:
Plug-n-Play is an inherent part of
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On-Board MemoryOrganization of theC
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memory counter overflow rolls over
Page 26 and 27: If during the data acquisition the
Page 28 and 29: On-board Memory: A Programmer’s V
Page 30 and 31: CompuScope RepetitiveCapture Perfor
Page 32 and 33: depth portion of the single channel
Page 34 and 35: Page 26CompuScope SDK Manual
Page 36 and 37: Sample Programs Folder Structure us
Page 38 and 39: • Gage_drv.hGage_drv.h contains g
Page 41 and 42: Writing a C Application forCompuSco
Page 43 and 44: The last routine, gage_trigger_cont
Page 45: Chapter 5:Sample Programs
Page 48 and 49: Program NameA2D_PAGED_TRANSFER.EXED
Page 50 and 51: Flow Chart describing the sample pr
Page 52 and 53: gage_trigger_control_2:gage_set_ext
Page 54 and 55: GAG2A2D_MUL_BM.EXEThe sample progra
Page 56 and 57: Gage API routines used:gage_get_dri
Page 58 and 59: DIGITAL_INPUT.EXEThe sample program
Page 61: Chapter 6:Appendices
Page 64 and 65: uInt32 sample_rate;void far *memptr
Page 66 and 67: trigger_level level at which trigge
Page 68 and 69: trigger_sensitivitytrigger_bandwidt
Page 70 and 71: Settings for boarddef structure fie
Page 72 and 73: 10 KHz SRTI_10_KHZ5 KHz SRTI_5_KHZ2
Page 74 and 75: • couple_eThe parameter couple_e
Page 79 and 80: Appendix C: CompilingCompuScope SDK
Page 81: Creating a new LabWindows CVI proje
Page 84 and 85: Arbitrary Waveform GenerationOne co
Page 86 and 87: Technical SupportGage Applied Techn
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