R series: compared to current output output impedance adaptation

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• 6210 USB output impedance

  Hello

  I use the 6210 USB to generate a train of pulses with the meter. I would like to know the output impedance of the acquisition of data to avoid the impedance mismatch. He is waiting to drive a load of 50 ohms? I couldn't find this info in the manual.

  Thank you

  Miko

  Hi Miko,

  Why are you concerned about impedance matching and what type of device you connect to? The USB-6210 using TTL and therefore values of impedance. As long as your current is lower than-16 my for 2.7 V or - 6 mA for 3.8 V (as specified in the technical manual of the product: http://www.ni.com/pdf/manuals/371932f.pdf), you should be fine.

• Basic measures and the output impedance of the change with PXI-4461?

  Hello

  I am required to build an audio station with platform PXI OR test.

  It is my first experience with Renault. So I don't really know a lot...

  The PXI-4461 is a replacement of a former HP audio Analyzer. The measure is quite simple:

  1 generate fixed freq signal and measure AC RMS power

  2 measure THD (total distortion harmic) at frequency fixed

  3 measure SNR (signal to noise) at frequency fixed

  4 generate and measure DC signals

  5. change the output impedance of 50 ohms and 600 ohms.

  If I have a good feeling on which tasks 1 to 4 are feasible. I would like to ask if the task 5 (change the output impedance) problem possible?

  If this isn't a work around?

  As for tasks 1 to 4, it is possible with out doing 'a sound vibration' Toolkit?

  How helpful the Toolbox will be for the tasks listed above (humble).

  What should be my starting point learn to manage these measurement with Labview?

  Thanks in advance

  Hi Hazkel,

  Sound and Vibration toolkit will help a lot with steps 1 through 3.  This without the Toolbox would require a very high level of knowledge with LabVIEW and you will probably run again for complications.  In response to the fifth step, I tried to adapt the output impedance and am not able to do so programmtically.  However, you can still do this in hardware by adding a shunt resistor and potentially switch between if necessary impedances.  We have an article that deals with impedance matching and a circuit configuration to set the impedance if you are interested:

  Impedance and impedance matching

  http://www.NI.com/white-paper/3475/en/

  I recommend starting with examples that we have already built in LabVIEW to familiarize yourself with the concepts.  You will find them by clicking on help-> find examples-> search, then search for your application. Please let me know if you have any other questions.

  Thank you

• Compare the current time and date with last modified?

  Compare the current time and date with last modified?
  
  What is the ideal way due to report at the last modified file with the date and time class? last modifed class in the file value is of type long.

  798642 wrote:
  No no no no, currentTimeMillis() only gets you the time... I need to compare the Date and time.

  You should read the docs more closely. It gives you the current time in time, which includes the date.

• Current output digital USB-6009

  Hi, I'm trying to increase the voltage output digital device USB-6009. I read a few topics on the use of a relay, but I couldn't get it.

  I was thinking of using power 5V on the map because there current 200mA on it, but when I use it with open-collector output, it cannot change the relay. When I measure the current between

  5V and ground: 200 ma,

  5V output, I read a value around 30-40 my.

  Why can I not use this 200mA with output? It is the Relay that I use.

  If this is not possible, can I use an external power supply 5V (with more current) and a digital output to pass the baton without damage the 6009?

  Outputs digital of the USB-6009 confined to 8.5 my. Your relay coli requires much more than that. Even if the power source can provide enough current for the relay, digital output can not put.

  The solution is to use a buffer of extermal. The ULN2003 can switch currents up to 500 my and voltage up to 50 V while being controlled by digital output.

  Lynn

• SC-2345 current output logic

  Hello

  Plug-in currently a case of the type SC-2345.

  Of this case I have to connect three output logic (P0.0 - P0.3) to three light (230Vac, 7W).

  I have to find a 0 - 5V-power online interface.

  Pour this do I need to know the current that can deliver/absorber each logic output box.

  I got no part specific to this kind of features in the documentation.

  Is anyone know where I could you find this information?

  Kind regards

  J

  The answer is simple: the connection between the card and the terminal block of the case is just wired so the characteristics are those of the card.

• PCIe-7842R (series R FPGA) digital output does not work properly

  Greetings,

  I'm having some problem show TTL the correct voltage with my PCIe-7842R FPGA board.

  The block diagram of my code FPGA LV Moose appears in "analog - digital .png '. The idea was to convert an analog input (decimal value) to a binary code and 16-bit output by 16 DIO ports. I use the connection block SCB-68 has as the terminal and trendy on the FPGA 1 connector RDIO with SHC68-68-RDIO shielded cable.

  The compiled code ok. But during the test, I noticed that some ports has no output TTL levels correctly. For example, for input 1000 decimal, I would expect binary code 0000001111101000. However, some ports (DIO #6, #7, #9, etc.), which are supposed to ~3.3V (1 digital) high TTL output, output actually 0.8V. I have attached the result measured in 'exit digital test.png '.

  To ensure that the question was not because of the code of the LV, I did some more tests on DIO #6 with a simple example (simple digital output.png). The output was ~ 1V this time at the digital 1.

  It's really confusing because of the digital Edition is supposed to be simple. I used the same FPGA card for controlling roller shutters with TTL signals before and it worked fine.

  Does anyone have similar problems? Any suggestions are greatly appreciated.

  iron_curtain wrote:

  DIOs are connected to a controller digital galvo Cambridge Tech. But I measured the voltage at the terminals of the connector block.

  If you unplug the controller galvo DIOs, do they look good (have the right voltages).  Do you know how many of these entries to the need for controller?  I think you hit the limit the total current available for EID within the Council.

• maximum current output module ni9401

  Hello, how mA is the current maximum that I can use in the module e/s DIGITAL NI9401?

  Thank you

  Hi, mariomoskis,

  Each digital line on the 9401 is capable of 100 au and sinking 2mA supply, you can find more information in the specifications for the 9401: NI 9401 Manual of Instructions and specifications:

  http://digital.NI.com/manuals.nsf/WebSearch/ABFB7FE8BF99B55B862573D0006D5F8B

  The 9401 protection against overcurrent, the following excerpt from this manual explains how this works:

  "On the NI 9401 overcurrent protection allows only a specified amount of current for the switching of channels DIO or sourcing the output load. If the NI 9401 enters a State of over-current, exceeding the specified maximum switching frequency or the output load, the power supply of the module begins to decline

  power until it goes off completely or the overcurrent condition is removed. When the module is in this State, it can accept the new direction of the line

  configuration and output data State but can't pass the valid input data for the software. See the features section for more information on the

  output and maximum load for each channel switching frequency. »

  I hope that helps!

  Saludos!

• To measure the pressure using a pressure transducer that provides the analog current output 4mA-20mA

  I wanted to acquire the current analog signal which varies from 4-20mA using NI 9207. I tried in 2 ways.

  method 1 - created an input channel current analog & used a reading Vi to acquire it. How can I give the channel connections in this...

  method 2 - using NOR-DAQ Assistant, I put the channel connections and I got Amplitude versus time graph. She also gave negative values. Can I do this way which is easier? How can I solve the problem

  First attachment belongs to the 1st method

  Second attachment belongs to the 2nd method

  
  

• name of file/page current output only

  CF colleagues:
  
  A simple question, even if I have to learn the answer.
  
  SCENARIO OF
  A visitor arrives on the web page www.myexample.com/index.cfm?lang=en & browser = ie
  
  QUESTION
  How can I let ColdFusion < cfoutput > the page/filename = index.cfm only. Thus, without the path, without the url variables. Fair and only "index.cfm".
  
  Hope you can help.
  
  Best regards,
  
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  Take one of the cgi variables that has the entire path and do a listlast() about it.

• How to compare the current password encrypted pasword enter APEX4.1

  Hi all
  In my application uses the following package

  create or replace PACKAGE BODY app_security_pkg
  AS
  PROCEDURE login 
            (
             p_uname IN VARCHAR2
            ,p_password IN VARCHAR2
            ,p_session_id IN VARCHAR2
            ,p_flow_page IN VARCHAR2
            )
  IS
   lv_goto_page NUMBER DEFAULT 1;
  BEGIN
   
   -- This logic is a demonstration of how to redirect 
   -- to different pages depending on who successfully 
   -- authenticates. In my example, it simply demonstrates 
   -- the ADMIN user going to page 1 and all other users going
   -- to page 2. Add you own logic here to detrmin which page 
   -- a user should be directed to post authentication.
   IF UPPER(p_uname) = 'ADMIN'
   THEN
    lv_goto_page := 1;
   ELSE
    lv_goto_page := 2;
   END IF;
  
  APEX_UTIL.SET_SESSION_STATE('FSP_AFTER_LOGIN_URL');
  
   wwv_flow_custom_auth_std.login 
   (
    p_uname => p_uname,
    p_password => p_password,
    p_session_id => p_session_id,
    p_flow_page => p_flow_page || ':' || lv_goto_page
    );
  
  EXCEPTION
  WHEN OTHERS
  THEN 
   RAISE;
  END login;
  
  PROCEDURE add_user 
  (
   p_username IN VARCHAR2
  ,p_password IN VARCHAR2
  )
  AS
  BEGIN
  INSERT INTO app_users (username, PASSWORD)
      VALUES (UPPER (p_username),
          get_hash (TRIM (p_username), p_password));
  
  COMMIT;
  
  EXCEPTION
  WHEN OTHERS
  THEN 
   ROLLBACK; 
   RAISE;
  END add_user;
  
  -- Function to Perform a oneway hash of the users 
  -- passwords. This cannot be reversed. This exmaple 
  -- is a very week hash and if been used on a production 
  -- system, you may want to use a stronger hash algorithm.
  -- Read the Documentation for more info on DBMS_CRYPTO as 
  -- this is the supported package from Oracle and 
  -- DBMS_OBFUSCATION_TOOLKIT is now depricated.
  FUNCTION get_hash (p_username IN VARCHAR2, p_password IN VARCHAR2)
  RETURN VARCHAR2
  AS
  BEGIN
  RETURN DBMS_OBFUSCATION_TOOLKIT.md5 (
  input_string => UPPER (p_username) 
                  || '/' 
                  || UPPER (p_password));
  END get_hash;
  
  PROCEDURE valid_user2 (p_username IN VARCHAR2, p_password IN VARCHAR2)
  AS
  v_dummy VARCHAR2 (1);
  BEGIN
  SELECT '1'
  INTO v_dummy
  FROM app_users
  WHERE UPPER (username) = UPPER (p_username)
  AND PASSWORD = get_hash (p_username, p_password);
  EXCEPTION
  WHEN NO_DATA_FOUND
  THEN raise_application_error (-20000, 'Invalid username / password.');
  END valid_user2;
  
  FUNCTION valid_user (p_username IN VARCHAR2, p_password IN VARCHAR2)
  RETURN BOOLEAN
  AS
  BEGIN
  valid_user2 (UPPER (p_username), p_password);
  RETURN TRUE;
  EXCEPTION
  WHEN OTHERS
  THEN RETURN FALSE;
  END valid_user;
  
  END app_security_pkg;

  Here the ADD_USER procedure will convert the password and stores in the Table app_users in encrypted form.
  
  In my application, users can change their password,
  So I need to compare the password entering the Current_password field with the password encrypted in the app_users table.
  So I used the following code,

  declare
    l_x varchar2(30);
  begin
    select username into l_x
          from app_users
      where upper(username) = upper(:P7_USERNAME)
        and password = :P7_CURRENT_PASSWORD;
    return (true);
  exception
    when no_data_found then
      return (false);
  end;

  This code works fine when the password is stored without encryption, but it displays error, after encryption
  
  because the password entered is simply password and not encrypted if the two are different even if the user enters the correct password.
  
  Please tel me how encrypt the entered password to compare with the encrypted password.
  
  Thank you
  Kind regards
  gurujothi.

  Hi guru,.

  When you say comparing it is obvious that both must be in the same format, so either you have to compare both encrypted or not encrypted.

  Do you have an example on apex.oracle.com?

  Thank you

• How get/compare the current value in a business rule?

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  How can I do this in the planning by using calculation Manager, I have an account named "service_years", I want to write:
  
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  How can the logic above to convert in the accepted syntax? because it is not applicable to such if condition directly on a member.
  
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  VR;

  If service_years == 5

  ;-)

  Kind regards
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• Series A300D comes with 3-* dishes *-pin adapter

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• How of current analog output more than 2mA

  Hi, I have designed a simple PID loop to control the input of a device voltage. My camera has an Ohm resistance. I found that being controlled input voltage may not exceed 0.6V, then I realized that the maximum output current is my 6211 NI DAQ 2mA. But I really need more 2mA (Max is 10mA). I tried to use a voltage follower because it has high impedance imput and low output impedance, but it does not work. Could someone tell me a method to solve the problem?

  Thank you.

  CJL

  

  100nF caps | with 10µF,.

  R optional...

  What OP do you currently use?

  Without this connection GND current can flow so you will stick to 0.6V as without a driver.