Monarch Tachometer Sensor

[Team Stoney]

Flip Tek... Thanks for the help, I'm still working on your VI.

Rob F,

Thanks for the help!

The product manual states the output is “TTL compatible pulse”.

Here is where I am at so far.  See attached doc.

[KowdTek]

I think you just missed the reciprocal. See attachment.

Message Edited by FlipTek on 09-17-2007 02:38 PM

[Team Stoney]

Flip Tek,

Thanks for pointing out the missing reciprocal.

Question... are you using the Monarch SPS-5 Series infrared sensor?

After you drag the DAQ Assistant to the Block Diagram what setting are you using for your DAQ Setup?

Here's mine:

Express >> Input >> DAQ Assistant

Create New Express Task Window opens; Acquire Signals >> Counter Input >> Frequency

Supported Physical Channels opens; I select “ctr0”,  It tells me to "Connect Your Signal to (Input Terminal): to PFI1"  This is pins 16 and 1 on the NI 9401.

Configuration Window opens

Setting I select;

Acquisition Mode = Continuous Samples

Samples to Read = 100(default)

Starting Edge = Rising

Measurement Method = 1 Counter (Low Frequency)

Signal Input Range = Max 200 Min 2

Scaled Units Hz.  I click run and 119 appears in the top Measured Values…

Thanks,

Team Stoney

[Team Stoney]

Flip Tek,

I cannot seem to get counter input... any ideas?

Thanks,

Team Stoney

[Robert_F]

Hello Team Stoney and Flip Tek,

The reciprocal is only needed if your task is measuring the period of your signal.  If your task is measuring frequency, then the driver will automatically make this calculation for you.  If you are using the counters on a cDAQ, then you need to have your module in either slot 5 or 6. 

119 (Hz or cycles/second) corresponds to the frequency of the measured waveform.  In order to get RPM just multiple the frequency by 60.  119 (cycles/second) * 60 (seconds/minute) = 7140 (cycles/minute)

[KowdTek]

Thanks for the follow up Robert.

Team Stoney, I'm using IRS-W that has TTL signal also.

[Jeff_T.]

I'm not sure what version of the Sound and Vibration Toolkit you are using, but the Sound and Vibration Measurements Suite has several order analysis examples that show the user how to synchronize TIO and DSA to acquire vibration and tach signals.  The examples support both PXI and cDAQ (9233/9401).  If you have the Order Analysis Toolkit or are already using the Sound and Vibration Measurement Suite then any example with the name "digital tacho" will work.

Best Regards,

Jeff Tipps
Product Support Engineer

[s-p]

I am using M series USB-6229 DAQ board.i applied the same program ,but i can not getting reading of this vi.any help?

[KowdTek]

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s-p wrote:
I am using M series USB-6229 DAQ board.i applied the same program ,but i can not getting reading of this vi.any help?

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Do you have the same tach sensor?

[s-p]

i got Monarch spsr-im with ROS tachometer.the output of them would be "TTL compatible Pulse".i used the same VI and configuration for frequency as Rober -F and Team stony ,but i am getting an error .