Level detection PXI 6624

Hi all,
I am trying to find out some details about the level detection in PXI 6624.I have a very simple timing measurement to perform. Start trigger at P1@9V and stop the trigger when P2 @-9V and measure the time elapsed( expected time is 1-1.4sec)
How to configure the CounternGate Signal in level detection mode? The UserManual says it is possible. I need help figuring this out.I see there is optical isolation for the inputs and I would think the inputs are only Supply/Gnd referenced.
Appreciate any help.
Neha

Hi Neha-
       I was looking a little further into your question and I made some assumptions in my previous post that I should clarify/possibly retract. The 6624 is a counter/timer card.  In the user manual it clarifies that digital low is anything below 0.8V and high is guaranteed anything above 4V. So, in reading your first post over, I assume that you are reading two square waves that jump from 0-9V, correct? One on P1 and the other on P2, with one line inverted? Then it sounds like you want to measure the time between the 9V on P1 and the -9V on P2, correct?
     If my understanding is now correct, then you should not use the level trigger detection example in LabVIEW, since it is for one signal on an analog line. Instead, what you should use is two-signal edge-separation, which measures the time between two different edges of two different signals.  Using the timebase, this measurement begins counting on the first active edge on the AUX line and latches the count into memory on the first active edge of the gate. What occurs internally is that a pulse is created with the first active edge of the AUX line and ends on the first active edge of the gate. The counter then performs pulse width measurement on this created pulse.
     Here is a link to a page on our website that will help you with this task:
KnowledgeBase 2D9G49EV: How Can I Measure the Time Between the Rising Edges of Two Digital Signals?
     If, however, you are measuring two analog signals, you will need to get a DAQ card with analog inputs.  If this is the case, I will refer you to our technical sales department at  (800)-433-3488.
     I apologize for any confusion, and hope this clarifies what you need!
Gary P.
Applications Engineer
National Instruments
Visit ni.com/gettingstarted for step-by-step help in setting up your system.

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PXI-6624 Can generate DC Voltage

Dear All:
Does PXI-6624 Can generate DC Voltage?I want to use this counter to generate 24V DC Voltage.

No，It's just a counter, though voltage level of it could be up to 48V.

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What is the best implementation method for the following pulse generation application
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Wiring - PXI-6624

Hi All -
I have an application that I need to make use of a counter, we chose the PXI 6624. I'm pretty darn good with the rest of NI hardware, aside from counters FPGA and RF are the only lines I haven't used. I'm running into some trouble understanding how to set up my leads on the 6624 and thought I'd ask on here.
I have a remote optical sensor (Monarch Instruments Model ROS) that I will need to monitor pulses on. Its got 4 leads coming off of it, a common, a signal, a +V excitation(10V), and the cable shielding (ie common). I'm also hooked up to a SCB-100 using their 100 pin flex cable.
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Anyhow, I'm reading through and it sounds like each of the inputs almost has multiple functions that overlap, but I'm having trouble digesting it. Can anyone help out with the wiring on this?
Just FYI - Short term, I have 1 sensor that will count RPM as 1 pulse per revolution. We will also want to do direction which will require a second sensor with the two set up much like the quadrature function requires. Only still both will have only 1 pulse per revolution, rather than an encoder with say 120 pulses per rev. Will eventually need to wire up both, but I think if I can figure out just the one I can use that to figure out the rest of the setup on my own :-)
Thanks a bunch!
LV7.1, LV8.5
Solved!
Go to Solution.

External Connections:
Sensor common connected to source - of counter
Signal from sensor connected to source + of counter
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PXI-6624 Pulse Frequency measurement

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"Requested Value: Pulse Frequency"
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Solved!
Go to Solution.

Yes, the "Pulse" (not to be confused with "Pulse Width") measurement was introduced with NI's STC3 devices including X Series and CompactDAQ.
Pulse Measurement:
However, you should still be able to measure frequency and duty cycle on your card with a semi-period measurement:
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PXI-6624 custom device

Hello,
Sorry for my bad english.
I start with the custom device.
I want use two PXI-6624 with Veristand for counter I/O.
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Hello HervéM,
Unfortunately there is no attachment.
Could you spot below the files you wanted to attach ?
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Certified TestStand Architect
Certified LabVIEW Developer
National Instruments France
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Travaux Pratiques d'initiation à LabVIEW et à la mesure
Du 2 au 23 octobre, partout en France

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Attachments:
6624.JPG ‏34 KB

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Attachments:
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Hello,
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How Do I Configure the PFI Lines as input in PXI 6713 module

Hi,
I have PXI 6713 module in my PXI 1044 chassis. I have configured PXI 6713 module to geneate certain analogue signals to my board.
Board inturn process this analogue signal and responds back the status signals through a status register on the board. In my application,the status bits in status register of the board are mapped to the PFI 0:3 bits on PXI 6713 module ( pins 11,10 , 42 and 43).
My query is how do i configue the PFI lines as input in PXI 6713 module to read these status bits ??
May be below explanation could give you little bit more information w.r.to my query.
When i use NI USB - 6008 module to read the same bits , since this device has 12 digital I/O lines, i could able to read the status bits in to the last 4 digital lines by configuring the those digital lines as input.
In PXI 6713 module i have only 8 digital lines. These 8 digital lines i have used to send the digital signals to the board. I am left with no digital I/O lines. Hence i couldn't use these digital lines. I am left with only one option to use. Theya re PFI lines. Moreover the status bits in the pin out of board are mapped such that the bits can be read through the PFI lines.
I am wondering do we have any example code to use inorder to read these status bits on the board using the PFI lines.
Please let me know if you need additional information to help me out.
Thanks.
Solved!
Go to Solution.

Hello There,
When using the PFI pin as an input, you can individually configure each PFI for edge or level detection and for polarity selection. This PFI information can be referenced in the DAQ Analog Output Series Manual on page 6-1 (http://www.ni.com/pdf/manuals/370735e.pdf). Unfortunately, the PXI-6713 PFI lines are only capable of timing input and output signal for AI, AO, or counter/timer functions. The option of creating static DI from the PFI lines is not available for the PXI-6713. However, some cards have this capability. Newer National Instruments products with PFI lines have the option of setting PFI lines as:
Static Digital Input
Static Digital Output
Timing Input Signal for AI, AO, DI, DO, or counter/timer functions
Timing Output Signal from AI, AO, DI, DO, or counter/timer functions
(http://digital.ni.com/public.nsf/allkb/14F20D79C649F8CD86256FBE005C2BC4)
When set as static DIO, the PFI lines are assigned to a different port (eg. PFI0-7 is Port1). More details about this can be referenced at:
http://digital.ni.com/public.nsf/allkb/DA2D3CD0B8E8EE2A8625752F007596E1
http://digital.ni.com/public.nsf/allkb/862567530005F09E8625677800577C27
Regards,
Roman Sandoval | National Instruments | RF Systems Engineer

Level detection PXI 6624

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