Calculating the true output frequency of a PXI-5402

I have a PXI-5402 card sat in a PXIe chassis. I am only interested in sine wave output at frequencies up to approx 10kHz. I know that it is posible to request an output frequency and then query the acutal output frequency but I would rather be able to calculate it before hand. All I can find in the literature is a figure of 0.355uHz for frequency resolution.
Is there a better description of the frequency resolution? If not, is the resolution exactly 0.355uHz or is this an approximation (to 3 significant figures)?
Solved!
Go to Solution.

This webcast is an excellent way to learn the process of which the NI 5402 and NI 5406 operate to generate their periodic functions: http://www.ni.com/webcast/75/en/
The 0.355uHz value is a theoretical value of achievable frequency rates based on the Clock Rate and Phase Accumulator size. This is the closest thing I can find on ni.com for you to use to calculate the value: http://zone.ni.com/reference/en-XX/help/370524R-01/siggenhelp/ni_5401_11_31_frequency_resolution_and...
I believe Fc for the NI 5402/5406 should be 100M and the accumulator size is 48-bit. Therefore frequency resolution = Fc / 2N = (100 × 10^6) / 2^48 = 3.55271368e-7
Keep in mind that the device has a VCXO frequency accuracy spec of +/- 25ppm, if you do not PLL lock it to a better source.
Product Support Engineer
National Instruments

Similar Messages

Frequency Control Word (PXI-5402): Rounded up or down?

A further question wrt PXI-5402 standard function generation.
The frequency control word is calculated by dividing the desired output frequency by the sample clock frequency (100MHz for a PXI-5402) and multiplying it by 2^N where 'N' is the width of the DDS accumulator (48 for the PXI-5402). As the frequency control word is an integer does any fractional residual result in the control word being rounded up or rounded down?
e.g. if a I request a frequency of 1Hz I get a control word of 2814749.767 which would give an actual output frequency of 0.99999997 Hz if rounding down or 1.00000008 Hz if rounding up.
Thanks.

I believe the FCW gets rounded. I actually was able to find a LV demo for you, but it was made for the 5411. You would need to change some values to make it work for the 5402/5406: http://www.ni.com/example/28757/en/
Keep in mind that all of the DDS calculations are actually implemented in HW on an FPGA, see figure 2: http://www.ni.com/white-paper/5516/en/. The tuning word here is the same as the FCW. This image used to be used on that white paper before it was updated. The adder in Figure 2 is the same adder in this image below.
Also, as I have mentioned before, the accuracy for the Sample Clock above for the 5402 is 25ppm. If the actual frequency you are generating is such a concern, are you using an external high accuracy clock source? What is your application?
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wrote in message
news:[email protected]..
> I need to apply a linear ramp to the output frequency of my digital TTL
> output to accelerate and deaccelerate the speed of a stepper motor - is
> there any way to do this such that the ramp is continous?
>
> using: Labview 5.0.1 on a PC with an AT-MIO-16E-1 board
>
> -thanks

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Hi,
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Attachments:
RATETEST.vi ‏202 KB

Let me start by answering the specific question, and then I will provide some suggestions on the code.
The function you want is the "Write to Spreadsheet File", which you're already using, albeit in a confusing means (more later). I was not able to find any place in your code where you're actually acquiring time information, so I don't understand your comment about the time not being exact. (I'm assuming you mean "not", even though that word was not in your actual sentence.)
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###########################debug vpm signal####################
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.Sep 20 07:02:55.424: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_opened_cb:
.Sep 20 07:02:55.424: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_process_event:
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.Sep 20 07:02:55.424: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/act_setup_req_wait_pend_success:
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.Sep 20 07:02:55.724: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/act_setup_pend_dial:
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.Sep 20 07:02:55.724: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dial:
.Sep 20 07:02:55.724: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/ds_do_dial:
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.Sep 20 07:02:56.568: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_dial_done_cb:
.Sep 20 07:02:56.568: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_process_event:
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.Sep 20 07:02:56.568: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/act_setup_pend_progress:
   Progress Indication=8, Signal Indication=2, cdb->answer_supervision=0
.Sep 20 07:02:56.568: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_ring_noan_timer_start:
   Timer Start Time=23417770, No Answer Timer Value=180000(ms)
.Sep 20 07:02:56.568: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_bridge_check_cb:
.Sep 20 07:02:56.572: htsp_call_bridged invoked
.Sep 20 07:02:56.572: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_bridge_check_cb:exit@1187
.Sep 20 07:02:56.572: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_bridge_status_cb:
.Sep 20 07:02:56.572: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_save_fax_config:
.Sep 20 07:02:56.572: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_save_fax_config:
   Fax Relay=ENABLED
   Primary Fax Protocol=CISCO_FAX_RELAY, Fallback Fax Protocol=NONE_FAX_RELAY
   Fax Relay CM Suppression :=ENABLED, Fax Parameters Set By=Global Settings
.Sep 20 07:02:56.572: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_set_fax_feat_param:
.Sep 20 07:02:56.572: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_save_tty_config:
.Sep 20 07:02:56.572: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_save_tty_config:
   Save TTY configuration
.Sep 20 07:02:56.572: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_set_tty_feat_param:
.Sep 20 07:02:56.572: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_set_tty_feat_param:
   Set TTY feat parameters
.Sep 20 07:02:56.572: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_process_event:
   [state:S_SETUP_REQ_PROC, event:E_CC_DO_CAPS_IND]
.Sep 20 07:02:56.576: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_peer_event_cb:
   Event=E_DSM_CC_CAPS_ACK
.Sep 20 07:02:56.576: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_process_event:
   [state:S_SETUP_REQ_PROC, event:E_CC_CAPS_IND]
.Sep 20 07:02:56.576: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_peer_event_cb:
   Event=E_DSM_CC_CALL_MODIFY
.Sep 20 07:02:56.580: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_feature_notify_cb:
   Feature ID=0, Feature Status=1
.Sep 20 07:02:56.580: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_reactivate_ringback:
.Sep 20 07:02:56.580: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_reactivate_ringback:exit@996
.Sep 20 07:02:56.580: htsp_process_event: [0/0/1, EM_WAIT_FOR_ANSWER, E_HTSP_VOICE_CUT_THROUGH]
.Sep 20 07:02:56.580: htsp_timer_stop2
.Sep 20 07:03:13.913: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_dsm_bridge_status_cb:
.Sep 20 07:03:13.913: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_process_event:
   [state:S_SETUP_REQ_PROC, event:E_CC_DISCONNECT]
.Sep 20 07:03:13.913: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/act_disconnect:
   Cause Value=16
.Sep 20 07:03:13.913: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_ring_noan_timer_stop:
   Timer Stop Time=23419504
.Sep 20 07:03:13.913: htsp_timer_stop3
.Sep 20 07:03:13.925: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_process_event:
   [state:S_WAIT_STATS, event:E_VTSP_DSM_STATS_COMPLETE]
.Sep 20 07:03:13.925: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/act_dsm_dsp_stats_complete:
.Sep 20 07:03:13.925: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_timer:
   Timer Start Time=23419505, Timer Value=60000(ms)
.Sep 20 07:03:13.929: htsp_process_event: [0/0/1, EM_WAIT_FOR_ANSWER, E_HTSP_RELEASE_REQ]em_wait_answer_release
.Sep 20 07:03:13.929: em_stop_timers
.Sep 20 07:03:13.929: htsp_timer_stop
.Sep 20 07:03:13.929: htsp_timer_stop2 em_onhook (0)
.Sep 20 07:03:13.929: [0/0/1] set signal state = 0x0 timestamp = 0
.Sep 20 07:03:13.929: em_start_timer: 400 ms
.Sep 20 07:03:13.929: htsp_timer - 400 msec
.Sep 20 07:03:14.329: htsp_process_event: [0/0/1, EM_GUARD_ALL, E_HTSP_EVENT_TIMER]em_guard_all_timer
.Sep 20 07:03:14.329: em_stop_timers
.Sep 20 07:03:14.329: htsp_timer_stop
.Sep 20 07:03:14.329: em_start_timer: 3000 ms
.Sep 20 07:03:14.329: htsp_timer - 3000 msec
.Sep 20 07:03:14.329: htsp_process_event: [0/0/1, EM_PARK, E_DSP_SIG_0000]em_park_onhook
.Sep 20 07:03:14.329: htsp_timer_stop
.Sep 20 07:03:14.329: htsp_timer_stop2 htsp_report_onhook_sig
.Sep 20 07:03:14.329: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_process_event:
   [state:S_WAIT_RELEASE, event:E_TSP_CALL_FEATURE_IND]
.Sep 20 07:03:14.329: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/act_call_feature_ind:
   Feature Type=6
.Sep 20 07:03:14.329: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_process_event:
   [state:S_WAIT_RELEASE, event:E_TSP_DISCONNECT_CONF]
.Sep 20 07:03:14.329: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/act_wrelease_release:
.Sep 20 07:03:14.329: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_play_busy_timer_stop:
   Timer Stop Time=23419546
.Sep 20 07:03:14.329: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_timer_stop:
   Timer Stop Time=23419546
.Sep 20 07:03:14.329: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_do_call_history:
.Sep 20 07:03:14.329: //48/E9FE7CA28104/VTSP:(0/0/1):-1:1:2/vtsp_do_call_history:
   Coder Rate=16
.Sep 20 07:03:14.333: //48/E9FE7CA28104/VTSP:(0/0/1):-1:-1:-1/vtsp_dsm_closed_cb:
.Sep 20 07:03:14.333: //48/E9FE7CA28104/VTSP:(0/0/1):-1:-1:-1/vtsp_process_event:
   [state:S_CLOSE_DSPRM, event:E_VTSP_DSM_CLOSE_COMPLETE]
.Sep 20 07:03:14.333: //48/E9FE7CA28104/VTSP:(0/0/1):-1:-1:-1/act_terminate:
.Sep 20 07:03:14.333: //48/E9FE7CA28104/VTSP:(0/0/1):-1:-1:-1/vtsp_timer_stop:
   Timer Stop Time=23419546
.Sep 20 07:03:14.333: //-1/E9FE7CA28104/VTSP:(0/0/1):-1:-1:-1/vtsp_free_cdb:
   CDB=0x47574E08
Thanks in advance.
Toshi

EDIT:
            I've not got any dial-tone back from PABX.
Thanks in advance
Toshi

Splitting datamatrix by output frequency

Hi, I have trouble finding out how to solve a problem in Labview
I am working on improving a program so that it may present data in different frequencies. My NI6211 reads 1000 analog samples per channel and second. I want to be able to display this data with various frequencies as i want to study transients more closely.
The program used to run in 20hz, thus i presented 20 values every second and channel, each value the mean of 50 samples. When i had a fixed frequency of 20 i just told the Read.vi to get 50 samples every 50ms working cycle, used "index array" to split it into 15 1D rows and calculated the mean for each row. The rows were then assembled back into a matrix and used as output.
Now i want to be able to run in 100hz/10samples (and also 50/20, 200/5, 500/2....). I have also changed the working cycle time to 60ms for other reasons.
DAQmx thus reads 60 samples on 15 analog channels every working cycle, and so i get a data matrix of 15x60.
Is there a way to split it into smaller pieces of 15x(sampling speed)? For example if i used a frequency of 100 i would get 6 sets of 15*10, allowing me to calculate the mean value of smaller intervals. For 500hz i would get 30 sets of 15*2 etc...
Is it possible to split a matrix into equally wide columns? Can it be solved with an indexed for loop?
Any help would be appreciated, im still a beginner at Labview!
Attachments:
Varying output frequency.jpg ‏92 KB

Your current code can be replaced by an autoindexing FOR loop, you only need once instance of the "add array elements" operation. Easiest would be to acquire it as a 1D array with a constant number of samples then use "reshape array" to create a 2D array of the desired dimensions to be used for autoindexing as suggested.
LabVIEW Champion . Do more with less code and in less time .

Problem with lenovo t60 and the vga output

I have a problem with the vga output and the lenovo t60
When i put the videoprojector connector in to the lenovo t 60, the projector reponde is:
Not supported
H: 48.20khz v: 143,10 hz
On my desktop pc the projector function on 1024x768 resolution and the 60 hz to refresh.
The same configurations are on my laptop and the projector doesn't function
Please help me.

I too have this problem. My T61 worked fine for about a year, and then suddenly would no longer project. I had made no changes to the settings for the external display, though since the problem started I've tried many combinations without success. Typically the projector reports that the frequency settings the laptop is sending are unsupported. In my case the vertical rate is usually correct (60 Hz) but the horizontal rate varies wildly.
I suspect a hardware problem, as this post suggests: http://www.edugeek.net/forums/av-multimedia-related/32128-laptop-wont-display-projector.html. (Note the message claiming that 6 out of 40 Lenovo laptops exhibited this problem.)
Since my system is still under warranty I guess I'll have to get it repaired, but I'd rather hear of a software fix...

How to keep the filtered output in a page after user navigates back?

How to keep the filtered output in a page after user navigates back to all records from another page.
Currently it clears the search

Hi,
user13091824 wrote:
How to keep the filtered output in a page after user navigates back to all records from another page.
Currently it clears the search---While returing from page AM Return status should be True in pageContext.setForwardURL.:::
pageContext.setForwardURL("OA.jsp?page=/XXX/oracle/apps/po/msg/webui/SearchPG",
"SUPP_SEARCH",
OAWebBeanConstants.GUESS_MENU_CONTEXT,
null,
null,
true, // Retain AM
OAWebBeanConstants.ADD_BREAD_CRUMB_NO,
OAWebBeanConstants.IGNORE_MESSAGES);
---After setting AM Status to true u can able to c the values.
Regards
Meher Irk

Calculatin​g the true output frequency of a PXI-5402

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