如何解码HP3458数字化模式

使用3458A时数据格式化很麻烦，您使用的编程环境是什么？
C，C＃，VB，VEE，Matlab，Labview等....如果我知道你正在使用哪一个，我可以尝试提供一个例子。



     以下为原文

  Data formatting is a pain when using the 3458A, what programming environment are you using?  C, C#, VB, VEE, Matlab, Labview, etc....

I can try and provide an example if I know which one you are using.

嗨，谢谢你挖了一下。我们在VB。



     以下为原文

  Hi, thanks for digging a bit.
We are in VB.

嗨，只是跟进.C或C＃也会很好，如果这有助于得到一个例子。再次，感谢你的帮助。



     以下为原文

  Hi, just following up.
C or C# will be fine too if that helps get an example.
Again, appreciate your help.

#include #include #include #include #include using namespace std; // //这个宏简化了代码的读取，但提供了错误检查//＃defineCHECK（func） do { ViStatus _s =（func）;
if（_s { fprintf（stderr，“错误：％s返回％d  n”，＃func，_s）;  exit（0）; } } while（0）//指定仪器的VISA地址
//说明了GPIB，USB 2.0或LAN //使用主VISA配置器获取VISA地址//由Agilent Connection Expert处理的配置//必须确定系统的每个仪器的VISA地址#define DEFAULT_ADDRESS_3458“GPIB0 :: 22：
：INSTR“void main（）{ViSession viDefaultRM，Inst_dmm; ViRsrc TxtAddress_dmm = DEFAULT_ADDRESS_3458; float dummyRead; // float * array = NULL; // array = new float [1000000]; // float * scaled = NULL; // scaled
= new float [1000000]; float array [512]; float scaled [512]; ////初始化Instruments进行通信并将它们设置为reset condition //将接口配置为20秒超时// CHECK（viOpenDefaultRM（
＆amp; viDefaultRM））; //打开DMM CHECK的路径（viOpen（viDefaultRM，TxtAddress_dmm，VI_NULL，20000，＆amp; Inst_dmm））;
CHECK（viSetAttribute（Inst_dmm，VI_ATTR_TMO_VALUE，700000））;
//最大速度读数vCarar（Inst_dmm）;
viPrintf（Inst_dmm， “复位 n”）;
viPrintf（Inst_dmm，“end on  n”）; viPrintf（Inst_dmm，“预设dig  n”）; viPrintf（Inst_dmm，“dcv 10  n”）; viPrintf（Inst_dmm，“aper 1.4E-6  n”）
; viPrintf（Inst_dmm，“trig auto  n”）; viPrintf（Inst_dmm，“mem off  n”）; //设置读数并触发instrumentviPrintf（Inst_dmm，“nrdgs 512  n”）; viPrintf（Inst_dmm，
“tarm sgl  n”）; //从3458AviScanf（Inst_dmm，“％512hy”，＆amp; array [0]）中移除读数和比例因子; viPrintf（Inst_dmm，“iscale？ n”）; viScanf（Inst_dmm，
“％f  n”，＆amp; dummyRead）; cout //乘以iscale for（int i = 0; i {scaled = dummyRead * array ; cout} / * //输出数据到文件，
可以用excel，matlab等进行分析... ofstream DMMwaveform; DMMwaveform.open（“DMMwaveform.csv”）; for（int g = 0; gDMMwaveform DMMwaveform.close（）; * / CHECK（viClose（Inst_dmm））;
检查（viClose（viDefaultRM））; // coutcoutchar wait = getchar（）;}

以上来自于谷歌翻译

     以下为原文

  #include
#include
#include
#include
#include
#include



using namespace std;


//
// This macro simplifies the reading of code and yet provides error checking
//
#define     CHECK(func)     
do {
    ViStatus _s = (func);
    if (_s < 0)
    {
    fprintf(stderr, "Error: %s returned %dn", #func, _s);
    exit(0);
    }
} while (0)

// Specify the VISA addresses for instruments
// GPIB, USB 2.0, or LAN are illustrated
// Use Primary VISA Configurator to obtain VISA addresses
// Configuration handled by Agilent Connection Expert
// You must determine your system's VISA Address for each instrument

#define DEFAULT_ADDRESS_3458 "GPIB0::22::INSTR"

void main()
{
    ViSession   viDefaultRM, Inst_dmm;
    ViRsrc      TxtAddress_dmm = DEFAULT_ADDRESS_3458;
     float           dummyRead;

//     float* array = NULL;
//     array = new float [1000000];

//     float* scaled = NULL;
//     scaled = new float [1000000];
     
     float array[512];
     float scaled[512];
     






     
     
     
     //
     // Initialize Instruments for communication and set them to reset condition
     // Configure the interface for 20 second timeout
     //
    CHECK(viOpenDefaultRM(&viDefaultRM));
     // Open path to DMM
    CHECK(viOpen(viDefaultRM, TxtAddress_dmm, VI_NULL, 20000, &Inst_dmm));
    CHECK(viSetAttribute(Inst_dmm, VI_ATTR_TMO_VALUE, 700000));


     //max speed readings
     viClear(Inst_dmm);
     viPrintf(Inst_dmm,"resetn");
     viPrintf(Inst_dmm,"end onn");
     viPrintf(Inst_dmm,"preset dign");
     viPrintf(Inst_dmm,"dcv 10n");
     viPrintf(Inst_dmm,"aper 1.4E-6n");     
     viPrintf(Inst_dmm,"trig auton");
     viPrintf(Inst_dmm,"mem offn");
     


     // set number of readings and trigger the instrument

     viPrintf(Inst_dmm,"nrdgs 512n");
     
     viPrintf(Inst_dmm,"tarm sgln");

     

     //Remove Readings and scale factor from the 3458A
     
     viScanf(Inst_dmm, "%512hy",&array[0]);

     

     viPrintf(Inst_dmm,"iscale?n");
     viScanf(Inst_dmm,"%fn",&dummyRead);

     cout << "Reading results" << endl;
     

     
     

     //multiply by iscale
     
    for (int i=0;i<512;i++)
     {
     

     scaled=dummyRead*array;

     cout << scaled << endl;
     

     }



     





/*
     // Output data to file, can be analyzed with excel, matlab, etc...

     ofstream DMMwaveform;
     DMMwaveform.open("DMMwaveform.csv");
     
     for (int g = 0; g<500; g++)
     DMMwaveform << scaled[g] << endl;
     DMMwaveform.close();
     


*/     

     
     
    CHECK(viClose(Inst_dmm));
    CHECK(viClose(viDefaultRM));

//     cout<< "DMMwaveform.csv created" <      cout<< "Press any key to exit" << endl;

     char wait = getchar();

}

嗨，谢谢你的代码。
但是我们仍然有SINT格式问题.---------------------------------单个DCV测量工作正常。
ASCII格式的数字转换器也在工作。
但是，当我使用示例代码时，“SINT格式”不起作用。我认为“viScanf（Inst_dmm，”％512hy“，＆amp; array [0]）;”
工作不正常。
返回值与输入电压（8.6Vdc）不匹配。
甚至没有关闭.---------------------------------这个命令令人困惑，“viScanf（Inst_dmm，”％512hy
“＆安培;数组[0]）;”？
正确的格式“hy”?,可能拼写或其他.---------------------------------程序查看：
// Hello_GPIB.cpp：定义控制台应用程序的入口点.//#include“stdafx.h”#include“visa.h”#include“iostream”#include“fstream”int main（int argc，char * argv
[]）{float array [512]; float array2 [256]; float scaled [512]; float retScale = 0; char cbuff [256] = {0}; // printf（“Hello HP3458！ n”）;
ViSession defaultRM，Inst_dmm; char buf [256] = {0}; / *在地址22 * / viOpenDefaultRM（＆amp; defaultRM）打开与GPIB设备的会话; viOpen（defaultRM，“GPIB :: 22 :: INSTR”，VI_NULL，
VI_NULL，＆amp; Inst_dmm）; viSetAttribute（Inst_dmm，VI_ATTR_TMO_VALUE，700）; //超时MilliSecondsviClear（Inst_dmm）; / *初始化设备* / viPrintf（Inst_dmm，“RESET  n”）; viPrintf（Inst_dmm，“END ON  
n“）; / *发送* IDN？
字符串到设备* / viPrintf（Inst_dmm，“ID？ n”）; / *读取结果* / viScanf（Inst_dmm，“％s”，buf）; / *打印结果* / printf（“仪器识别字符串：％
s  n“，buf）; / * Single Read这是工作* // * NORM * / viPrintf（Inst_dmm，”PRESET NORM  n“）; // TRIGviPrintf（Inst_dmm，”TARM SGL  n“）; viScanf（
Inst_dmm，“％s”，buf）; //这是工作/ *打印结果* / printf（“Ascii Foramt（电压）：％s  n”，buf）; //这是工作/ *结束Sigle读取
* // * Clear * / viClear（Inst_dmm）; / *初始化设备* / viPrintf（Inst_dmm，“RESET  n”）; / *高速DCV ASCII * / viPrintf（Inst_dmm，“END ON  n”）; /
* FAST * / viPrintf（Inst_dmm，“PRESET FAST  n”）; viPrintf（Inst_dmm，“APER 1.4E-6  n”）; viPrintf（Inst_dmm，“OFORMAT ASCII  n”）; viPrintf（Inst_dmm，“MEM FIFO
n“）; viPrintf（Inst_dmm，”NRDGS 512，AUTO  n“）; viPrintf（Inst_dmm，”TARM SGL  n“）; for（int i = 0; i {// GET DATAviScanf（Inst_dmm，”％s）
“，cbuff）; //这是工作/ *打印结果* / printf（”Ascii：％s  n“，cbuff）; //这是工作} // GET ScaleviPrintf（Inst_dmm，”ISCALE？ n“）
; viScanf（Inst_dmm，
“％f  n”，＆amp; retScale）; / *打印结果* / printf（“比例：％f  n”，retScale）; / * retScale为1.由于ascii格式* ///////
//////////////////////////////////////////////////
/////////// *高速DCV * / viPrintf（Inst_dmm，“END ON  n”）; // ASCII格式发送cr lf。
SINT和DINT格式不发送./* FAST * / viPrintf（Inst_dmm，“PRESET FAST  n”）; viPrintf（Inst_dmm，“APER 1.4E-6  n”）; viPrintf（Inst_dmm，“OFORMAT SINT  n”
）; viPrintf（Inst_dmm，“MEM FIFO  n”）; viPrintf（Inst_dmm，“NRDGS 512，AUTO  n”）; viPrintf（Inst_dmm，“TARM SGL  n”）; // GET DATAviScanf（Inst_dmm，“％512hy”
“，＆amp; array [0]）; //没有错误，但值错误。
/ *打印结果* / for（i = 0; i {printf（“Data：％f  n”，array ）;} // GET ScaleviPrintf（Inst_dmm，“ISCALE？ n”）; viScanf（Inst_dmm
，“％f  n”，＆amp; retScale）; / *打印结果* / printf（“Scale：％f  n”，retScale）; / * retScale是0.000431。这是合理的值吗？我想是的。全尺度
约为32000. 32000 X 0.000431 =约1.4V。* // *打印结果* / for（i = 0; i {printf（“Data;％f  n”，array ）; scaled =
retScale * array ; //没有错误，但值错误.printf（“％f  n”，scaled ）;} / *高速DCV结束* // *清除* / viClear（Inst_dmm）
; / *初始化设备* / viPrintf（Inst_dmm，“RESET  n”）; viPrintf（Inst_dmm，“END ON  n”）; // EOI模式为END ON，用于高速模式/ * PRESET DIG * / viPrintf（
Inst_dmm，“PRESET DIG  n”）; / * 10V范围* / viPrintf（Inst_dmm，“DCV 10  n”）; viPrintf（Inst_dmm，“APER 1.4E-6  n”）; viPrintf（Inst_dmm，“TRIG AUTO”
n“）; viPrintf（Inst_dmm，”MEM OFF  n“）; // viPrintf（Inst_dmm，”MEM FIFO  n“）; // 512个样本/ TriggerviPrintf（Inst_dmm，”NRDGS 512  n“）; //
TRIGviPrintf（Inst_dmm，“TARM SGL  n”）; // GET DATAviScanf（Inst_dmm
，“％512hy”，＆amp; array [0]）; //没有错误，但返回值错误。
没有意义。
//获取ScaleviPrintf（Inst_dmm，“ISCALE？ n”）; viScanf（Inst_dmm，“％f  n”，＆amp; retScale）; / *打印结果* / printf（“比例：％f  n”，retScale）
; for（i = 0; i {printf（“Data;％f  n”，array ）; scaled = retScale * array ; printf（“％f  n”，scaled [i
]）; //没有错误，但值错误。} / *关闭会话* / viClose（Inst_dmm）; viClose（defaultRM）;返回0;}

以上来自于谷歌翻译

     以下为原文

  Hi, thanks for the code.  However we are still having SINT format issues.
---------------------------------
A single DCV measurement is working. A digitizer with ASCII format is working, too. However 'SINT format' does not work when I use the sample code.
I think  "viScanf(Inst_dmm, "%512hy",&array[0]);" is not working correctly.      The return value does not match input voltage(8.6Vdc) . Even not close.
---------------------------------
This command is confusing, "viScanf(Inst_dmm, "%512hy",&array[0]);"? correct format "hy"?, may spell or something else.
---------------------------------
Program for view:
// Hello_GPIB.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "visa.h"
#include "iostream"
#include "fstream"

int main(int argc, char* argv[])
{
     float array[512];
     float array2[256];
     float scaled[512];
     float retScale=0;
     char cbuff [256] = {0};

     //printf("Hello HP3458!n");
     
     ViSession defaultRM, Inst_dmm;
     char buf [256] = {0};

     /* Open session to GPIB device at address 22 */
     viOpenDefaultRM(&defaultRM);
     viOpen(defaultRM, "GPIB::22::INSTR",VI_NULL,VI_NULL,&Inst_dmm);
     viSetAttribute(Inst_dmm, VI_ATTR_TMO_VALUE, 700);     // Time out MilliSeconds
     
     viClear(Inst_dmm);
     /* Initialize device */
     viPrintf(Inst_dmm, "RESETn");

     viPrintf(Inst_dmm, "END ONn");
     /* Send an *IDN? string to the device */
     viPrintf(Inst_dmm, "ID?n");
     
     /* Read results */
     viScanf(Inst_dmm, "%s", buf);
     
     /* Print results */
     printf("Instrument identification string:%sn", buf);



/* Single Read This is working*/

     /* NORM */
     viPrintf(Inst_dmm, "PRESET NORMn");
     
     //TRIG
     viPrintf(Inst_dmm, "TARM SGLn");

     viScanf(Inst_dmm, "%s", buf);          // This is working
     
     /* Print results */
     printf("Ascii Foramt(Voltage):%sn", buf);// This is working

/* End of Sigle Read */

     /* Clear */
     viClear(Inst_dmm);
     /* Initialize device */
     viPrintf(Inst_dmm, "RESETn");


/* High Speed DCV ASCII */
     viPrintf(Inst_dmm, "END ONn");     
     /* FAST */

     viPrintf(Inst_dmm, "PRESET FASTn");

     viPrintf(Inst_dmm, "APER 1.4E-6n");

     viPrintf(Inst_dmm, "OFORMAT ASCIIn");

     viPrintf(Inst_dmm, "MEM FIFOn");

     viPrintf(Inst_dmm, "NRDGS 512,AUTOn");

     
     viPrintf(Inst_dmm, "TARM SGLn");

     for (int i=0 ;i<512;i++)
     {
     //GET DATA
     viScanf(Inst_dmm, "%s",cbuff);     // This is working

     /* Print results */
     printf("Ascii:%sn",cbuff)     ;     // This is working
     }

     //GET Scale
     viPrintf(Inst_dmm, "ISCALE?n");
     viScanf(Inst_dmm, "%fn",&retScale);          

     /* Print results */
     printf("Scale:%fn", retScale);          

     /* retScale is 1. Because of ascii format*/

//////////////////////////////////////////////////////////////////




/* High Speed DCV */
     viPrintf(Inst_dmm, "END ONn");     //ASCII format sends the cr lf. SINT and DINT format does not send.
     /* FAST */

     viPrintf(Inst_dmm, "PRESET FASTn");

     viPrintf(Inst_dmm, "APER 1.4E-6n");

     viPrintf(Inst_dmm, "OFORMAT SINTn");

     viPrintf(Inst_dmm, "MEM FIFOn");

     viPrintf(Inst_dmm, "NRDGS 512,AUTOn");

     
     viPrintf(Inst_dmm, "TARM SGLn");

     //GET DATA
     viScanf(Inst_dmm, "%512hy",&array[0]);     // No error but value is wrong.

     /* Print results */
     for ( i=0 ;i<512;i++)
     {
     printf("Data:%fn", array);     
     }

     //GET Scale
     viPrintf(Inst_dmm, "ISCALE?n");
     viScanf(Inst_dmm, "%fn",&retScale);

     /* Print results */
     printf("Scale:%fn", retScale);          

     /* retScale is 0.000431. Is this resonable value?  I guess so. FULL scale is about 32000. 32000 X 0.000431 = about 1.4V. */


     /* Print results */

     for ( i=0 ;i<512;i++)
     {
          printf("Data;%fn",array);

          scaled=retScale*array;     // No error but value is wrong.

          printf("%fn",scaled);
     }


/* End of High Speed DCV */
     


     /* Clear */
     viClear(Inst_dmm);
     /* Initialize device */
     viPrintf(Inst_dmm, "RESETn");

     viPrintf(Inst_dmm, "END ONn");          // EOI mode to END ON for High-Speed Mode

     /* PRESET DIG*/
     viPrintf(Inst_dmm, "PRESET DIGn");

     /* 10V range */
     viPrintf(Inst_dmm, "DCV 10n");

     viPrintf(Inst_dmm, "APER 1.4E-6n");

     viPrintf(Inst_dmm, "TRIG AUTOn");

     viPrintf(Inst_dmm, "MEM OFFn");
     //viPrintf(Inst_dmm, "MEM FIFOn");


     // 512 samples/Trigger
     viPrintf(Inst_dmm, "NRDGS 512n");     

     //TRIG
     viPrintf(Inst_dmm, "TARM SGLn");     

     //GET DATA
     viScanf(Inst_dmm, "%512hy", &array[0]);          // No error but return value is wrong. Does not make sense.

     //GET Scale
     viPrintf(Inst_dmm, "ISCALE?n");
     viScanf(Inst_dmm, "%fn",&retScale);

     /* Print results */
     printf("Scale:%fn", retScale);

     for ( i=0 ;i<512;i++)
     {
          printf("Data;%fn",array);

          scaled=retScale*array;

          printf("%fn",scaled);          // No error but value is wrong.
     }

     
     /* Close session */
     viClose(Inst_dmm);
     viClose(defaultRM);
     
     return 0;
}

你的权利，我的错误。
在我发出之前我没有测试过。
我知道它在某个时间点工作，但我昨晚测试了这个并且遇到了你看到的相同的数据错误。
也许这是我写的程序的早期版本。
直到明天我才可能没有任何东西给你，但我知道我可以为你找到一份工作计划。
真的很抱歉。



     以下为原文

  Your right, my mistake.  I didn't test it before I sent it out.  I know had it working at one point in time, but I tested this last night and was getting the same data errors you are seeing.  Maybe this was an early version of a program I wrote.  I probably won't have anything for you till tomorrow, but I know I can get a working program to you.  Really sorry about that.

我仍然遇到问题，这非常令人沮丧，因为我知道我以前有这个工作。
我的同事更像是一个编程大师，而不是我自己。
当他回到办公室时，我应该能够弄清楚正在发生什么。％hy来自哪里的小背景：3458A使用Big Endian格式，而我们的PC使用Little Endian格式。
由于3458A发送短路（2字节），所以交换字节。
仪器发送0xCDAB，但我们需要0xABCD。
'y'命令将读回一个字节数组，默认情况下交换字节。
'h'修饰符表示它是2个字节。



     以下为原文

  I'm still having problems, which is very frustrating since I know I had this working before.  My colleague who is more of a programming guru than myself is currently out.  When he gets back in the office I should be able to figure out what's going on.

A little background on where the %hy comes from:

The 3458A uses a Big Endian format, while our PC’s use a Little Endian format. Since the 3458A is sending a short (2 byte), the bytes are swapped. Instrument sends 0xCDAB, but we need 0xABCD. The ‘y’ command will read back a byte array, while swapping the bytes by default. The ‘h’ modifier says that it is 2 bytes.

好吧我明白了。
愚蠢的错误我应该早点抓住。
我把我的数组作为一个浮点而不是一个短的，尝试这个应该工作：// 3458A_100K_vstudio08.cpp：定义控制台应用程序的入口点//## include“stdafx.h”#include #include #include＃
include #include #include using namespace std; // //这个宏简化了代码的读取，但提供了错误检查//＃defineCHECK（func） do { ViStatus _s =（func）;  if（_s { fprintf
（stderr，“错误：％s返回％d  n”，＃func，_s）;  exit（0）; } } while（0）//指定仪器的VISA地址// GPIB，USB 2.0，
或LAN说明//使用主VISA配置器获取VISA地址//由Agilent Connection Expert处理的配置//您必须确定系统的每个仪器的VISA地址#define DEFAULT_ADDRESS_3458“GPIB0 :: 1 :: INSTR”void main（）
{ViSession viDefaultRM，Inst_dmm; ViRsrc TxtAddress_dmm = DEFAULT_ADDRESS_3458; float dummyRead; short rawdata [512]; float scaled [512]; ////初始化用于通信的仪器并将它们设置为重置条件
//配置接口20秒超时// CHECK（viOpenDefaultRM（＆amp; viDefaultRM））; //打开DMM CHECK路径（viOpen（viDefaultRM，TxtAddress_dmm，VI_NULL，20000，＆amp; Inst_dmm））;
CHECK（viSetAttribute（Inst_dmm，VI_ATTR_TMO_VALUE，700000））;
//最大速度读数vCarar（Inst_dmm）;
viPrintf（Inst_dmm， “复位 n”）;
viPrintf（Inst_dmm，“end always  n”）; viPrintf（Inst_dmm，“预设dig  n”）; viPrintf（Inst_dmm，“mformat SINT  n”）; viPrintf（Inst_dmm，“oformat SINT  n”）; viPrintf（
Inst_dmm，“dcv 10  n”）; viPrintf（Inst_dmm，“aper 1.4E-6  n”）; viPrintf（Inst_dmm，“trig auto  n”）; viPrintf（Inst_dmm，“mem off  n”）; /
/设置读数并触发instrumentviPrintf（Inst_dmm，“nrdgs 512  n”）; viPrintf（Inst_dmm，“tarm sgl  n”）; //从3458AviScanf中移除读数和比例因子（Inst_dmm，“％512hy  n
“，＆amp; rawdata [0]）; viPrintf（Inst_dmm，”iscale？ n“）; viScanf（Inst_dmm，”％f  n“，＆amp; dummyRead）; cout //乘以iscale（int i = 0
; i {scaled = dummyRead * rawdata ; cout} / * //输出数据到文件，可以用excel，matlab等进行分析... ofstream DMMwaveform; DMMwaveform.open（“DMMwaveform.csv”
）; for（int g = 0; gDMMwaveform DMMwaveform.close（）; * / CHECK（viClose（Inst_dmm））; CHECK（viClose（viDefaultRM））; // coutcoutchar wait = getchar（）;}

以上来自于谷歌翻译

     以下为原文

  Alright I figured it out.  Dumb mistake I should have caught sooner.  I had my array as a float instead of a short, try this one out should work:

// 3458A_100K_vstudio08.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include
#include
#include
#include
#include
#include



using namespace std;


//
// This macro simplifies the reading of code and yet provides error checking
//
#define     CHECK(func)     
do {
    ViStatus _s = (func);
    if (_s < 0)
    {
    fprintf(stderr, "Error: %s returned %dn", #func, _s);
    exit(0);
    }
} while (0)

// Specify the VISA addresses for instruments
// GPIB, USB 2.0, or LAN are illustrated
// Use Primary VISA Configurator to obtain VISA addresses
// Configuration handled by Agilent Connection Expert
// You must determine your system's VISA Address for each instrument

#define DEFAULT_ADDRESS_3458 "GPIB0::1::INSTR"

void main()
{
    ViSession   viDefaultRM, Inst_dmm;
    ViRsrc      TxtAddress_dmm = DEFAULT_ADDRESS_3458;
     float           dummyRead;


     
     short rawdata[512];
     float scaled[512];
     






     
     
     
     //
     // Initialize Instruments for communication and set them to reset condition
     // Configure the interface for 20 second timeout
     //
    CHECK(viOpenDefaultRM(&viDefaultRM));
     // Open path to DMM
    CHECK(viOpen(viDefaultRM, TxtAddress_dmm, VI_NULL, 20000, &Inst_dmm));
    CHECK(viSetAttribute(Inst_dmm, VI_ATTR_TMO_VALUE, 700000));


     //max speed readings
     viClear(Inst_dmm);
     viPrintf(Inst_dmm,"resetn");
     viPrintf(Inst_dmm,"end alwaysn");
     viPrintf(Inst_dmm,"preset dign");
     viPrintf(Inst_dmm,"mformat SINTn");
     viPrintf(Inst_dmm,"oformat SINTn");
     viPrintf(Inst_dmm,"dcv 10n");
     viPrintf(Inst_dmm,"aper 1.4E-6n");     
     viPrintf(Inst_dmm,"trig auton");
     viPrintf(Inst_dmm,"mem offn");
     


     // set number of readings and trigger the instrument

     viPrintf(Inst_dmm,"nrdgs 512n");

     
     
     viPrintf(Inst_dmm,"tarm sgln");

     

     //Remove Readings and scale factor from the 3458A
     
     viScanf(Inst_dmm, "%512hyn",&rawdata[0]);

     viPrintf(Inst_dmm,"iscale?n");
     viScanf(Inst_dmm,"%fn",&dummyRead);

     

     cout << "Reading results" << endl;
     

     
     

     //multiply by iscale
     
    for (int i=0;i<512;i++)
     {
     

     scaled=dummyRead*rawdata;

     cout << scaled << endl;
     

     }



     





/*
     // Output data to file, can be analyzed with excel, matlab, etc...

     ofstream DMMwaveform;
     DMMwaveform.open("DMMwaveform.csv");
     
     for (int g = 0; g<500; g++)
     DMMwaveform << scaled[g] << endl;
     DMMwaveform.close();
     


*/     

     
     
    CHECK(viClose(Inst_dmm));
    CHECK(viClose(viDefaultRM));

//     cout<< "DMMwaveform.csv created" <      cout<< "Press any key to exit" << endl;

     char wait = getchar();

}