Accuracy of measurements in Keynote.

Hi, Everyone.
Question:
I have seen some presentations showing how Keynote allows one to work with measurements on slides and draw objects to a predefined scale. In some of them a ruller appeared on Keynote slides and was used to obtain measurements of photos displayed on these slides.
How can one obtain somewhat accurate measurements from images displayed in a Keynote slide? Are there mechanisms in Keynote to allow users to work with images, their mesurements and then draw on a slide using those measurements as a reference?
Thank you advance,
Joe.

To set to display in pixels, inches or cms values:    Keynote > Preferences > Rulers
Objects on slides do not display or print out to size as there is no scaling system in Keynote, a 20cm image does not print a 20cm image.
To display the ruler:    View > Show Rulers (command R)
To input numerical values:    Inspector > Metrics

Similar Messages

4072 accuracy when measuring 7uA DC

I need to understand the accuracy of 4072 card, for an error budget study.
1) when measuring 7uA DC current, please let me know the details of error stackup. not just the result, I need the calculation details for each error component.
on page 3 of attached specification sheet, bottom table, first row, it states:
DC Current* ± (ppm of reading + ppm of range)
- Range: 20 mA
- Resolution: 10 nA
- Burden Voltage (typical): <20 mV
- Noise (ppm of range rms): 20
- 2 Year (0 °C to 55 °C): 400 + 150
- Tempco/°C (0 °C to 55 °C): 8 + 1
my error calculation is as follwing (7uA DC/ temperature 40C):
- Noise (ppm of range rms): 20 * 10^-6 * 20,000uA = 0.4uA
- 2 Year (0 °C to 55 °C): 400 * 10^-6 * 7uA + 150 * 10^-6 * 20,000uA = 3.0028uA
- Tempco/°C (0 °C to 55 °C): (8 * 10^-6 * 7uA + 1 * 10^-6 * 20,000uA) * 40C = 0.80224uA
so total error = 0.4 + 3.0028 + 0.80224 = 4.20504uA @ 7uA DC
error % = 4.20504/7 = 60.072%
Is my calculation right or wrong?
2) on page 2 of the attached specification sheet, under "DC System Speeds", it says "Trigger latency ..... 2uS". Does this mean 4072 can catch the trigger condition 2uS after the event?
Say I have a step function DC current drops from 1A to 0 at T0. I set trigger as 0.5A. so 4072 will detect the event @ T0+2uS??
Thanks!!!!!!
Attachments:
NI PXI 4072 DMM Specifications.pdf ‏665 KB

Hi QWERT1 and welcome to the discussion forums.
Since the lowest range of the 4072 is 20mA, reading 7uA will prove to be a challenge and I do not doubt you will be seeing an error in the realm of 50%. Comparatively, the 4071, which has a 10uA range, would allow for much higher accuracy readings at this level.
I see that you contact National Instruments directly and seem to have closed out your service request with an Applications Engineer.
For all other viewers reading this, QWERT1 calculated the accuracy correctly except for one aspect: the tempco. The only mistake here was that this needed to be multiplied by the number of degrees difference from the last calibration temperature. QWERT1 multiplied by the temperature, 40, rather than the temperature difference from the last external or self-calibration temperature. So if the calibration temperature is 23degC and the current temperature is 25degC, then you would multiply the error by 2.
Thanks again for using the forums QWERT1!
PBear
NI RF

Keynote Slide Size

I used to create images in Photoshop in 1024x768 then drag them to Keynote which was set up as 1024x768px size slides. Now, with 6.1, I don't see a way to customize my slides in pixel format. Am I missing something?

The 6.1 version of KN does NOT support a pixel size image
I have to be blunt; this is nonsense. The unit of measurement in Keynote is pixels, the final product is a file that calculates pixels, and what can be seen on screen is pixels.
Did you know that point is a measurement of the height of a letter press type, nothing to do with graphic shapes? Photoshop uses point size so that type can be placed in proportion correctly.
In Keynote, this is all easily confirmed;
A 1 Point screen size is interpreted as requiring 1.333 pixels (this is an agreed international standard)
type in the value 800 x 800 in the slide size window in Keynote, export to TIFF and an exact 800 x 800 pixel image is created.
Therefore if Keynote measured in points, the image would export as 600 x 600 pixels.
You can if you wish use points in Photoshop, just remember to recalculate the values by 1.333
I repeat again, if you compose your images in Photoshop, input pixels and set to dpi to 72 and all images will import full screen and centered.

How to calculate the temperature accuracy from RTI accuracy voltage ?

Hi..
I calculated the system accuracy = +/- 0,9 mV which the system accuracy RTI=0,018%
I connect PT100 to SCXI1121+DAQ6052E.
That I need is the accuracy in °K
If I use (system accuracy RTI)0,018% * 300 (Full scale of Temperature) and I get +/- 0,05°K, is that correct ?
I already read from
"Finding the Accuracy of Measurements in the Units of a Sensor" http://digital.ni.com/public.nsf/websearch/99173BA39CEC612986256CFF000A933E?opendocument&Submitted&&node=133020_US
But I don't really understand how to convert from mV back to Temperature again. Is that depend on some special factor?
The next point, is I used interpolation method. The output temperature is also depend on the ca
libration curve. ---> How can I convert back in this point.
Thank you very much for any kind help.

Thanks for the link, here is the result:
Quote
Recommended PSU: 324W (206W on +3.3v & +5v rails) for:
-1 x Motherboard without onboard devices
-3 x Fans (including PSU fans)
-3 x Memory (128MB DDR)
-1 x Graphic Card
-1 x with powerful 3D Accelerator
-1 x PCI Sound
-1 x PCI Network Card
-1 x HDD
-1 x CD-RW
-1 x DVD
-1 x Floppy
-4 x USB devices
-1 x Keyboard
-1 x Mouse
-CPU: AMD K7 2167C MHz BT (1.65 V)
So 300W probably is a bit on the light side for me, then?
3.3V - 20A
12V - 15A

Where can I find Resolution Benchmarking.vi used in Tutorial 3778?

Where can I go to download the Resolution Benchmarking.vi program used in Tutorial # 3778 "Performing High-Accuracy Temperature Measurements Using a NI Digital Multimeter and Switch"?
Thank you,
Kevin Hanson

Hi Kevin,
We don't have that particular example posted. I'm checking to see if we made that example public but your best bet for now is to work off of the included pitcures. The VI's used are pretty straightforward - it's really just switching to ch0, reading, switching to the cjcChannel, reading and then scaling the voltage based on the Thermocouple. Another VI that has very similar functionality (it uses scanning instead of single connections) would be the niSwitch Thermocouple Measurements.vi in example finder.
Cheers,
Andrew S.
National Instruments
Getting Started with NI-DAQmx
Measurement Fundamentals

Can we see performance score at reports column in OATS?

We've installed OATS and OAT Administrator to PC, and tried to do performance testing and show/read some score measurement at reports column, which will be generated by running 3rd party script. In OATS reports column, we can only see pie chart and bar chart for the passed, failed information from running tests, or the running statistics among 3rd party test, manual test, and oracle OpenScript test.
I am asking how to show the performance measure results (like accuracy, F-measure) from running 3rd party script on reports column graph?
We also need to see comparison charts which shows the performance difference between two days or more testing results.
Can we do this with reports site?
Thank you,
Jason
Edited by: 900021 on Nov 30, 2011 2:10 PM

please check DataSource Hierarchy: 0PS_OBJNR_HIER & DataSource Attributes: 0PS_OBJNR_ATTR.
otherwise i think you can go for development.
lets see others comment.
thanks
Sunil

What counter method to use for measurements on combustion engine

Hello,
Here is my dilemma. I want to measure the rpm of crank/cam shaft and thus I need to determine which of the three methods to use to get accuracy +-5rpm and couple of readings during one revolution of the shaft.
The hardware: NI PCI 6120-two counters
IRC 360-3600 pulses
Lets say I want to measure the range of rpm of the crankshaft from 100rpm(1.7Hz) to 10000rpm(166.7Hz). If I use the IRC with 720pulses I get the frequency range I will be measuring 1200Hz-120kHz assuming the IRC is on the crankshaft.
So my question is which of the methods to use? I did some calculations to determine that
1) 1 counter - the calculated rpm if the real rpm was 6000 would be between 5973-6017 which is not good enough
2) 2 counters, high freq - I would have to be using the frequency of the gate around 1Hz to get desired accuracy at 100rpm which is not suitable since I also want to have more readings through one revolution - do I understand it right? That would mean for example at 6000rpm I would have to wait 100revolutions to get one rpm reading, right?
3) seems as the right choice but still the acuracy is not good enough. If I use the divider of 10 it gives me 72readings per one revolution if the IRC is set to 720 pulse. If I measure at 6000rpm the diversion is then +-3rpm. But with 10000rpm and 3600pulses per revolution of the irc the diversion is already +-40
What method is used for this kind of measurement? How to improve accuracy?
Thanks
Message Edited by ceties on 07-09-2009 03:12 PM
LV 2011, Win7

Hi Ceties,
Yes, if you want to measure 600 kHz signal, the error will increase. I thought you were intend to measure upto 120 kHz.
In Method III, we do the following:
We have a known time period (1 ms), we have a frequency to measure (100 kHz), we will know how many pulses are going to be in that period ([100*e3]*[1*e-3]=100). First, we would like to divide this frequency with the first counter: we generate another known pulse train for 1 ms period with i.e. 500 pulses. In this case the rate will be 100/500 = 1/5.
Know, we are able to measure a lower frequency signal (100 kHz*1/5 = 20 kHz) with Method I. Which results a much more accurate measurement. That is the theory behind Method III.
Pulses per revolution to read will remain the same in each case: (frequency to measur)/(basis clock); in different methods we are trying to increase accuracy with measuring either a longer period (Method II) or diveded frequency (Method III).
I hope it will help moving forward with your project!
Regards,
Matyas

PXI 2527 & PXI 4071 -Questions about EMF considerations for high accuracy measurements and EMF calibration schemes?

Hi!
I need to perform an in-depth analysis of the overall system accuracy for a proposed system. I'm well underway using the extensive documentation in the start-menu National Instruments\NI-DMM\ and ..\NI-Switch\ Documenation folders...
While typing the question, I think I partially answered myself while cross-referencing NI documents... However a couple of questions remain:
If I connect a DMM to a 2 by X arranged switch/mux, each DMM probe will see twice the listed internal "Differential thermal EMF" at a typical value of 2.5uV and a max value of less than 12uV (per relay). So the total effect on the DMM uncertainty caused by the switch EMF would be 2*2.5uV = 5uV? Or should these be added as RSS: = sqrt(2.5^2+2.5^2) since you can not know if the two relays have the same emf?
Is there anything that can be done to characterize or account for this EMF (software cal, etc?)?
For example, assuming the following:
* Instruments and standards are powered on for several hours to allow thermal stability inside of the rack and enclosures
* temperature in room outside of rack is constant
Is there a reliable way of measureing/zeroing the effect of system emf? Could this be done by applying a high quality, low emf short at the point where the DUT would normally be located, followed by a series of long-aperture voltage average measurements at the lowest DMM range, where the end result (say (+)8.9....uV) could be taken as a system calibration constant accurate to the spec's of the DMM?
What would the accuracy of the 4071 DMM be, can I calculate it as follows, using 8.9uV +-700.16nV using 90 days and 8.9uV +- 700.16nV + 150nV due to "Additional noise error" assuming integration time of 1 (aperture) for ease of reading the chart, and a multiplier of 15 for the 100mV range. (Is this equivalent to averaging a reading of 1 aperture 100 times?)
So, given the above assumptions, would it be correct to say that I could characterize the system EMF to within 8.5uV+- [700.16nV (DMM cal data) + 0.025ppm*15 (RMS noise, assuming aperture time of 100*100ms = 10s)] = +-[700.16nV+37.5nV] = +- 737.66nV? Or should the ppm accuracy uncertainties be RSS as such: 8.5uV +- sqrt[700.16nV^2 + 37.5nV^2] = 8.5uV +-701.16nV??
As evident by my above line of thought, I am not at all sure how to properly sum the uncertainties (I think you always do RSS for uncertainties from different sources?) and more importantly, how to read and use the graph/table in the NI 4071 Specifications.pdf on page 3. What exactly does it entail to have an integration time larger than 1? Should I adjust the aperture time or would it be more accurate to just leave aperture at default (100ms for current range) and just average multiple readings, say average 10 to get a 10x aperture equivalent?
The below text includes what was going to be the post until I think I answered myself. I left it in as it is relevant to the problem above and includes what I hope to be correct statements. If you are tired of reading now, just stop, if you are bored, feel free to comment on the below section as well.
The problem I have is one of fully understanding part of this documenation. In particular, since a relay consists of (at least) 2 dissimilar metal junctions (as mentioned in the NI Switch help\Fundamentals\General Switching Considerations\Thermal EMF and Offset Voltage section) and because of the thermo-couple effect (Seebeck voltage), it seems that there would be an offset voltage generated inside each of the relays at the point of the junction. It refeers the "Thermocouple Measurements" section (in the same help document) for further details, but this is where my confusion starts to creep up.
In equation (1) it gives the expression for determining E_EMF which for my application is what I care about, I think (see below for details on my application).
What confuses me is this: If my goal is to, as accurately as possible, determine the overall uncertainty in a system consisting of a DMM and a Switch module, do I use the "Differential thermal EMF" as found in the switch data-sheet, or do I need to try and estimate temperatures in the switch and use the equation?
*MY answer to my own question:
By carefully re-reading the example in the thermocouple section of the switch, I realized that they calculate 2 EMF's, one for the internal switch, calculated as 2.5uV (given in the spec sheet of the switch as the typical value) and one for the actual thermocouple. I say actual, because I think my initial confusion stems from the fact that the documenation talks about the relay/switch junctions as thermocouples in one section, and then talks about an external "probe" thermocouple in the next and I got them confused.
As such, if I can ensure low temperatures inside the switch at the location of the junctions (by adequate ventilation and powering down latching relays), I should be able to use 2.5uV as my EMF from the switch module, or to be conservative, <12uV max (from data sheet of 2527 again).
I guess now I have a hard time believeing the 2.5uV typical value listed.. They say the junctions in the relays are typically an iron-nickel alloy against a copper-alloy. Well, those combinations are not explicitly listed in the documenation table for Seebeck coefficients, but even a very small value, like 0.3uV/C adds up to 7.5uV at 25degC. I'm thinking maybe the table values in the NI documentation reffers to the Seebeck values at 25C?
Project Engineer
LabVIEW 2009
Run LabVIEW on WinXP and Vista system.
Used LabVIEW since May 2005
Certifications: CLD and CPI certified
Currently employed.

Seebeck EMV needs temperature gradients , in your relays you hopefully have low temperature gradients ... however in a switching contact you can have all kind diffusions and 'funny' effects, keeping them on same temperature is the best you can do.
Since you work with a multiplexer and with TCs, you need a good Cold junction ( for serious calibrations at 0°C ) and there is the good place for your short cut to measure the zero EMV. Another good test is loop the 'hot junction' back to the cold junction and observe the residual EMV. Touching (or heating/cooling) the TC loop gives another number for the uncertainty calculation: the inhomogeneous material of the TC itself..
A good source for TC knowledge:
Manual on the use of thermocouples in temperature measurement,
ASTM PCN: 28-012093-40,
ISBN 0-8031-1466-4
(Page1): 'Regardless
of how many facts are presented herein and regardless of the percentage
retained,
all will be for naught unless one simple important fact is
kept firmly in mind.
The thermocouple reports only what it "feels."
This may or may not the temperature of interest'
Message Edited by Henrik Volkers on 04-27-2009 09:36 AM
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

PXI 6608 Measure Frequency 1Hz with accuracy 1ppm

I need to measure a frequency of 1 Hz with accuracy less than 1 ppm
icant do it with a PXI 6608 its normal ?
1 Hz is measured 1,000007 Hz by a PXI 6608
in this case, the error is 7ppm but i need less than 1ppm, i should measure 1,0000007 to have 0,7 ppm
please help its so urgent !!!!!!!!!

Hello,
In order to set the counter source to the timebase, you can use the the get/set/reset CI_CtrTimebaseSrc in order to set this in CVI. Please consult the DAQmx C reference Help for more information. Here are the functions if you can't find it in the help.
int32 __CFUNC DAQmxGetCICtrTimebaseSrc(TaskHandle taskHandle,
const char channel[], char *data, uInt32 bufferSize);
int32 __CFUNC DAQmxSetCICtrTimebaseSrc(TaskHandle taskHandle,
const char channel[], const char *data);
int32 __CFUNC DAQmxResetCICtrTimebaseSrc(TaskHandle taskHandle,
const char channel[]);
As for performing a loopback test to test its accuracy, this isn't the best way to do this because the source is creating a signal with relatively the same accuracy as you are reading in back on the same device. Knowing that this signal is accurate down to .7ppm, we need to apply a source for the counter that is much more accurate than this. First way to do this is to change the timebase source to the 10MHz clock like I mentioned above. The other way is to place the PXI-6608 in slot 2 so that it overwrites the 10MHz clock on the backplane. This 10MHz clock is used with PLLing the 80MHz clock that is normally used in counter tasks. Which slot do you have the PXI-6608 in? Could it be placed in this slot?
Jim St
National Instruments
RF Product Support Engineer

SCXI-1328 temperature measurement accuracy

The catalog says temperature accuracy of SCXI-1328 is 0.5C. If I use three thermocouple, does 0.5C uncertainty exist for all results from each thermocouple? Or, only cold junction has 0.5C uncertainty so that all results have the same offset from real value. In latter case, what is the accuracy of temperature measurement?

Hello efour,
0.5 ºC is the accuracy for the Cold Junction Compensation (CJC) for the SCXI 1328 terminal block for temperatures ranging from 15-35 ºC. Each thermocouple measurement would be subject to this factor. That is the only factor from the 1328 that will affect your temperature measurements.
The overall measurement accuracy of your system would be dependent upon what module you have the 1328 block attached to and what data acquisition (DAQ) card you are using. There is an accuracy calculator available on our website. You can reach it at
Accuracy Calculator
http://www.ni.com/advisor/accuracy/
With this tool, you can enter in your DAQ and SCXI card information. It will return the accuracy of each and then the overall system accuracy. It do
esn�t include the terminal block, though.
General information about taking thermocouple measurements can be found at:
Thermocouple Temperature Measurements
http://zone.ni.com/devzone/conceptd.nsf/webmain/4C54819521D3503786256D73006E8BE9?opendocument
Let me know if you have any further questions on this issue.
Scott Romine,
National Instruments

Absolute Accuracy of a Load Cell measurement.

I see how to calculate absolute accuracy for the SCXI-1520 and SCXI-1600 combination. To call out the accuracy of a load cell measurement, do I have to add the load cell specification numbers for non-linearity, non-repeatability, and hysteresis to the absolute accuracy calculations?

Hi KPR,
If you want the entire system accuracy, including the load
cell, we definitely need to include the load cell accuracy in our calculations.
I am not sure which document you were looking at to get the accuracy thus far,
but KB 2X4HGEBG
gives a great explanation about accuracies. In order to include the load cell accuracy, first
get the absolute accuracy of the load cell, and then put this in the equation ‘System
Accuracy = ( (Absolute Accuracy 1)^2 + (Absolute Accuracy 2)^2 + (Absolute
Accuracy 3)^2 + ...) )^(1/2)’ as ‘Absolute
Accuracy 4’.
David L.
Systems Engineering
National Instruments

DAQmxCfgImplicitTiming vs frequency measure accuracy

Hi,
I am trying to measure the frequency of a digital input. Its duty cycle varies a little but the total width of 18 pulses is always fixed. I tried to follow the example of "Dig Freq-Low Freq 1 Ctr" but it seemed the width of 18 pulses varied obviouly which is wrong. Then I tried another example "Buff Semi-Period-Finite" and this time the result was correct. I compared the two examples and found that the main difference is there is DAQmxCfgImplicitTiming func in the latter example. Then I added DAQmxCfgImplicitTiming to the "Dig Freq-Low Freq 1 Ctr" and now it works correctly. So my question is what DAQmxCfgImplicitTiming is for? How come it can improve frequency measure accuracy? Please give me some details instead of the simple instruction in the C reference help.
Thanks.
David

David,
I aplogize if my previous posts have been confusing, but here is how you should be configuring your DAQmx tasks:
- you should use implicit timing when doing any buffered counter measurement: so this includes a continuous or finite acquisition of counter measurements
- as such if you are performing a single 1 sample acquisition of data on the counters, you should not use implicit timing as it does not perform the timing measurement accurately (the counter does not start counting at the correct point)
- the DAQmxReadCounterScalarF64 function and DAQmxReadCounterF64 functions don't have an effect on the timing. You can use either depending on whether you are doing buffered measurement or not
- the difference between these two functions is that the ScalarF64 function returns the raw tick count for a frequency or period measurement. This is the count the counter returns when comparing your signal to the 20Mhz timebase. The other function makes the transformation from raw tick count to an actual frequency or period measurement (in Hz or seconds)
I hope this clears things up,
Abhinav
Abhinav T.
Applications Engineering
National Instruments India
LabVIEW Introduction Course - Six Hours
Getting Started with NI-DAQmx
Measurement Fundamentals

What is the accuracy of frequency measure with PCI 6023E?

I am measuring the exact frequency of 2.7Mhz signal. using PCI-6023E ,how can i calculate the accuracy of the measurments?

See
http://exchange.ni.com/servlet/Redirect?id=8437352
Regards
Filipe A.
Applications Engineer
National Instruments

Export failure in Keynote into QT–No Accuracy for timings–Software options?

Hi There,
I'm having a horrible time trying to export a presentation made in Keynote 2 into Quicktime. This presentation has audio embedded in the presentaion (not as an object on the slide) and also has quicktime movies (screen movies made with snapzpro) on the slides. (do these qwuicktimes have to be converted to MPEGS?)
No matter which setting I use, it always gives me an error at the end of the export that either my disk is full or there is an error in the file. I have another presentation that has audio on each slide with no quicktimes on slides and the export function works fine (though through the export process the build timings are changed) . If I upgraded will this problem be fixed, it doesn't seem that these issues were addressed in the current version? Is the problem the audio embedded in the presentation itself or the use of quicktime files, should I change the movie format of those files?
The other major roadblock I am having is the inability to accurately set timings. The builds and transition pre-sets can change easily (i.e. if you are plugged into an external monitor or LCD). The QT exports are even more unreliable. It seems that evertime I need to show the presentation I need to reset all timings in the room I am presenting in and based if I'll be plugged in, and even still no guarantees. If I could get it to export properly or at all in QT, I could just present throught there, but I can't.
Am I just using the wrong piece of software for what I want to accomplish? Is there even a presentation software out there with this kind of functionality or do you have to move to apps like Final Cut? I am will be willing to make the investment if I know it will be succesfull.
I'm really at a loss. Any suggestions would be much appreciated.
Thanks.

I'm having that same error! Have you found an answer for that yet
it always gives me an error at the end of the export that either my disk is full or there is an error in the file.

Color accuracy in Keynote?

What's up with colors in Keynote? I use the color picker to create a very rich orange, then when I apply it to an object on a slide, it comes out as a washed-out almost-yellow.
Anybody else having problems like this?

Okay, I found my problem (though the Keynote UI is very confusing in this regard.) If you click on the object, open the Colors Palette, set a color, then drag it onto the object, the object changes color...but not to the color you want! If, however, you click on the object, click on the "Fill" button on the Format bar, open the Colors Palette through the Fill pop-up (not via the toolbar), it will all work as desired.
Very weird.

Accuracy of measurements in Keynote.

Similar Messages

Maybe you are looking for