Sampling waveform values and writing corresponding time values

I am sampling the frequency of a generator set using a 1126 module. The frequency values I am getting are approximately 60 Hz.
I am sampling at 150 samples per second and using the Index Waveform Array function to peel off the frequency waveform. Then I am running that waveform wire (brown) through a Get Waveform components function to seperate the t0, dt, and y components. I am taking the oranage wire from the Y portion to write those values to a spreadsheet file. Then I want to build an array of the frequency values and the time values and write that to file (transposing the array if need be).
I want one column to be the frequency values and the second column to be the correspond
ing time values for each of those data points. For example, starting at t=0:
Frequency (Hz) Time (s)
60.0 0
60.1 0.0066666
59.9 0.0133333
60.2 0.0200000
60.1 0.0266666
|
|
| end of first second
|
V
60.5 0.9866666
60.1 0.9933333
60.0 1.0000000
59.7 1.0066666
The time interval increments by 1/150 of a second each time a sample is taken (150 times per second).
I tried to use the Get Waveform Time Array function, but that returned a 10 digit number that did not appear to be related to the time in seconds.
Can someone please advise me on how I can get the corresponding time values in seconds for waveform data points in the situation described above? Thanks!

Since you are aquiring at a constant sample time, you could try using the ramp pattern to generate the time column.
I attach a sample VI in which I generate the ramp starting from waveform characteristics and then create the 2d array to save to disk with Write to Spreadsheet File.vi.
Hope this helps
Roberto
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?
Attachments:
waveform_to_spreadsheet.vi ‏20 KB

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http://www.ni.com/support

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What you wanted to know about Time values

Hello
I tried to gather in a single document the useful infos about the use of time values in Numbers.
I must thanks pw1840 which checked the English syntax.
Here is the text only document.
Files with the sample tables are available on my iDisk:
<http://idisk.me.com/koenigyvan-Public?view=web>
Download:
ForiWork:ForNumbers:Time in Numbers.zip
*STORED DATE-TIME VALUES - BASICS*
Numbers clearly states that it stores date-time values, no less no more. This means these values consist of two parts: a date and a time. It is important to note that both parts are present even if only one of them is displayed.
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1) Since TIMEVALUE() returns a decimal number, when we calculate the corresponding number of seconds we MUST use the ROUND() function. While calculations with decimal numbers give the wanted value, they may not be exact and be off by + or - epsilon. And
2) The structure of Numbers date-time values is such that the time part is always in the range 0:00:00 thru 23:59:59.
There is also a detail which seems annoying to some users. The minimal time unit is the second because time values are in fact a pseudo string representing the number of seconds between the date-time and the base date-time, 1 janvier 1904 00:00:00.
-+-+-+-+-
*TIMEVALUE() FUNCTION*
When Numbers Help states that the TIMEVALUE() function "converts a date, a time, or a text string to a decimal fraction of a 24-hour day.", it means that the operand for the function TIMEVALUE() may be something like:
31/12/1943, 31 décembre 1943, or 31 déc. 1943 described as a date;
1:12:36 or 1:12 described as time; or
31/12/1943 23:59:59 described as a text string.
The date may also be 31/12/43 but here the program must guess the century. According to the rule, this one will be 31/12/2043 (yes, I am very young).
All of this is not exactly what we are accustomed to but it is perfectly logical as described. My guess is that those who don't understand are simply clinging to old habits and are reluctant to adopt an unfamiliar approach .
-+-+-+-+-
*ELAPSED TIME (DURATION)*
Given a table whose 1st row is a header, I will assume that column B stores starting-time values and column C stores ending-time values. Both do not display the date component of the date-time values. We may get the difference in column D with the formula:
=IF(OR(ISBLANK(B),ISBLANK(C)),"",TIMEVALUE(C)-TIMEVALUE(B))
which returns the elapsed time as the decimal part of the day.
We immediately encounter a problem. If ending-time is the day after the starting-day, the result will be negative. So it would be useful to revise the formula this way:
=IF(OR(ISBLANK(B),ISBLANK(C)),"",IF(TIMEVALUE(C)>TIMEVALUE(B),0,1)+TIMEVALUE(C) -TIMEVALUE(B))
But some of us may wish to see results in the traditional format which may be achieved using:
=IF(OR(ISBLANK(B),ISBLANK(C)),"",TIME(0,0,ROUND((IF(TIMEVALUE(C)>TIMEVALUE(B),0 ,1)+TIMEVALUE(C)-TIMEVALUE(B))24*6060,0)))
-+-+-+-+-
*DURATION SUMS > or = 24 HOURS*
In the examples above, we always assumed that the durations where smaller than 24 hours because Numbers states clearly in the Help and the PDF Users Guide that time values are restricted to the range 00:00:0 to 23:59:59. For longer durations we must fool Numbers.
First problem: we are adding several time durations. Each duration is in the authorized range and the result is greater than 24 hours.
As before, starting-time values are in column B, ending-time ones are in column C, and the elapsed time value is in column D. The formula is:
=IF(OR(ISBLANK(B),ISBLANK(C)),"",IF(TIMEVALUE(C)>TIMEVALUE(B),0,1)+TIMEVALUE(C) -TIMEVALUE(B))
in column E, the formula for the cumulative elapsed time value is:
=SUM($D$2:D2)
in column F, converting to time format, the formula is:
=TIME(0,0,ROUND(MOD(E,1)24*6060,0))
in column G, the formula for showing more than 24 hours in the day/hour/minute format is:
=IF(E<1,"",INT(E)&IF(E<2," day "," days "))&F
in column H, expressing total elapsed time in total hours using the traditional time format, the formula is:
=IF(E<1,F,INT(E)*24+LEFT(F,LEN(F)-6)&RIGHT(F,6))
in column I, expressing total elapsed time in total hours using the traditional time format, an alternate formula is:
=IF(E<1,F,INT(E)*24+HOUR(F)&":"&RIGHT("00"&MINUTE(F),2)&":"&RIGHT("00"&SECOND(F ),2))
Of course the user would choose the format used in column G or the one in column I for his table. There is no need to keep all of them. It would be fine to hide column F whose contents are auxiliary.
Second problem: individual durations may be greater than 23:59:59 hours.
Again, column B is used to store starting date-time, column C stores ending date-time, and durations are calculated in column D. Since B and C are storing full date-time values, we may use this simple formula to find the duration:
=C-B
in column E, the time portion of the duration given in time format is:
=TIME(0,0,ROUND(MOD(D,1)24*6060,0))
in column F the formula to show the duration as days/hours/minutes is:
=IF(D<1,"",INT(D)&IF(D<2," day "," day(s "))&E
in column G we give the elapsed time in total hours using a time format. The formula is:
=IF(D<1,E,INT(D)*24+LEFT(E,LEN(E)-6)&RIGHT(E,6))
in column H we give the elapsed time in total hours using a time format. An alternate formula is:
=IF(D<1,E,INT(D)*24+HOUR(E)&":"&RIGHT("00"&MINUTE(E),2)&":"&RIGHT("00"&SECOND(E ),2))
If the duration is greater than 24 hours, the results in columns E and F are not a time value but a string. So the value in column D (which is time duration only) is useful.
-+-+-+-+-
*PROBLEM WITH ENTERING TIME*
When you wish to enter 12:34 but 12 is the number of minutes, remember that Numbers will decipher this as 12 hours and 34 minutes. Simple tip:
Assuming that your original entry is in column B, then in column C use this formula to align the minutes and seconds for proper Numbers interpretation:
=IF(ISERROR(TIME(0,LEFT(B,SEARCH(":",B)-1),RIGHT(B,LEN(B)-SEARCH(":",B)))),"",T IME(0,LEFT(B,SEARCH(":",B)-1),RIGHT(B,LEN(B)-SEARCH(":",B))))
-+-+-+-
*MISCELLANEOUS NOTES*
• Of course, the addition of two dates and multiplication or a division applied to one date means nothing and would generate the red triangle announcing a syntax error.
• We may add a time value to a date-time: If B contains a date-time and C contains a time, the following formula will return the sum of the two values:
=B+TIMEVALUE(C)
• We may strip the time value of a full date-time one with the formula: =DATE(YEAR(B),MONTH(B),DAY(B))
• Just as a reminder,
=EDATE(B, 3) adds 3 months to the pure date stored in B
so, of course,
=EDATE(B, 12) adds one year to the pure date stored in B
• If B and C store date-time values,
=C-B returns the difference in decimal days.
=DATEDIF(B,C,"D") returns the number of days between the two pure dates. It's identical to =DATE(YEAR(C),MONTH(C),DAY(C))-DATE(YEAR(B),MONTH(B),DAY(B))
=DATEDIF(B,C,"M") returns the number of months between the two pure dates.
=DATEDIF(B,C,"Y") returns the number of years between the two pure dates.
Three other variants are available which use the parameters "MD","YM" and "YD".
Yvan KOENIG (from FRANCE lundi 25 août 2008 15:23:34)

KOENIG Yvan wrote in his "*STORED DATE-TIME VALUES - BASICS*" section:
The minimal time unit is the second because time values are in fact a pseudo string representing the number of seconds between the date-time and the base date-time, 1 janvier 1904 00:00:00.
This is not exactly true. Numbers files store date-time values in a string format consistent with ISO 8601:2004. This format explicitly includes year, month, day, hour, minute, & second values.
This may be verified by examining the uncompressed index.xml file in a Numbers package. For example, the first day of 1904 is stored as cell-date="1904-01-01T00:00:00+0000" & of the year 0001 as cell-date="0001-01-01T00:00:00+0000." This format is not a numeric value of seconds from a base date-time, often referred to as a "serial time" format, that is used in applications like AppleWorks (or Excel?).
Note that the time value (all that follows the "T" in the string) actually has four components, the last one (following the plus) representing the time zone offset from UTC time in minutes. AFAIK, Numbers does not set this to anything besides "+0000" but interestingly, it will attempt to interpret it if set by manually editing the file. For example, change cell-date="1904-01-01T00:00:00+0000" to cell-date="1904-01-01T00:00:00+0120" & the cell will display the last day of December of 1903 as the date, but will still show the time as 00:00:00. This suggests a future version of Numbers might be time zone aware, but currently it is unreliable & not fully implemented.
Anyway, Numbers does not use the first day of 1904 as a reference for stored date-time values, although it will add that date to "dateless" time values imported from AppleWorks spreadsheets. Although I have not verified this, I believe it will also seamlessly translate between ISO & serial time formats as needed for Excel imports & exports, using the first day of 1900 as needed.
Some other things to note about the ISO standard:
• It permits fractional time values in the smallest time unit present, so for example "T10:15:30" could be represented as "T10:15.5" but Numbers does not support this -- the cell will appear empty if the index file is manually edited this way.
• It does not stipulate whether date-time values represent intervals or durations (although it includes an explicit format for intervals between any two date-time values, known as a period). This means a future version of Numbers could support durations without the addition of a new data storage type, but legacy & import/export issues could make this too impractical to implement.
• It supports a variety of other formats, including date-only, time-only, day-of-year, week-of-year, & various truncations (just hours & minutes, for example). All are unambiguous so a future version of Numbers could support them, but files generated with those versions would not be backwards compatible with the current version.
For completeness, I will add that instead of using complex formulas to manipulate single-cell date-time values in Numbers, it is sometimes more straightforward to use multiple cells, one for each unit of time (for example, days, hours, minutes, & seconds), plus simple arithmetic formulas to combine them. Since each unit is a simple number, this results in highly portable, accurate, & "future-proof" tables, especially for durations. This is particularly useful for multimedia work in which the units might include video or film frames or audio samples.

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                <Boolean value="false" />
            </BooleanCriterion>
            <BooleanCriterion name="displayPackages" displayvalue="No">
                <Boolean value="false" />
            </BooleanCriterion>
            <BooleanCriterion name="displayCustomProperties" displayvalue="No">
                <Boolean value="false" />
            </BooleanCriterion>
            <BooleanCriterion name="strictPackageMatch" displayvalue="No">
                <Boolean value="false" />
            </BooleanCriterion>
            <BooleanCriterion name="displayCriteriaAtEnd" displayvalue="No">
                <Boolean value="false" />
            </BooleanCriterion>
            <SelectCriterion name="elementExists" displayvalue="Not applied" />
            <IntegerCriterion name="maxLinesPerBlock" displayvalue="10">
                <Integer>10</Integer>
            </IntegerCriterion>
            <NodesCriterion name="nodes" displayvalue="TripwireENT.demo.net">
                <OID>-1y2p0ij32e8bw:-1y2p0ij32e7cu</OID>
            </NodesCriterion>
            <MatchCriterion name="nodeName" displayvalue="Not applied" operator="contains" />
            <CustomPropertiesCriterion name="nodeProps" displayvalue="Not applied" />
            <RulesCriterion name="rules" displayvalue="Critical System Files">
                <OID>-1y2p0ij32e7q2:-1y2p0ij31snh6</OID>
            </RulesCriterion>
            <MatchCriterion name="ruleName" displayvalue="Not applied" operator="contains" />
            <MatchCriterion name="elementName" displayvalue="Not applied" operator="contains" />
            <CustomPropertiesCriterion name="elementProps" displayvalue="Not applied" />
            <CustomPropertiesCriterion name="versionProps" displayvalue="Not applied" />
            <AttributesCriterion name="attributes" displayvalue="Not applied">
                <Integer name=".missingImpliesFailure">1</Integer>
            </AttributesCriterion>
            <ContentCriterion name="content" displayvalue="Not applied" />
            <MatchCriterion name="auditEventUserName" displayvalue="Not applied" operator="contains" />
            <IntegerCriterion name="changeType" displayvalue="Added, Modified, Removed">
                <Integer>7</Integer>
            </IntegerCriterion>
            <SeverityRangeCriterion name="severity" displayvalue="1 - 10000">
                <Integer name="min">1</Integer>
                <Integer name="max">10000</Integer>
            </SeverityRangeCriterion>
            <BooleanCriterion name="currentVersionsOnly" displayvalue="Yes">
                <Boolean value="true" />
            </BooleanCriterion>
            <TimeRangeCriterion name="timeRange" displayvalue="All time" />
            <PackagesCriterion name="packages" displayvalue="Not applied" />
            <SortCriterion name="sortNodes" displayvalue="Name, ascending" isascending="true">
                <String>name</String>
            </SortCriterion>
            <SortCriterion name="sortRules" displayvalue="Name, ascending" isascending="true">
                <String>name</String>
            </SortCriterion>
            <SortCriterion name="sortElements" displayvalue="Name, ascending" isascending="true">
                <String>name</String>
            </SortCriterion>
            <SortCriterion name="sortVersions" displayvalue="Date, descending" isascending="false">
                <String>date</String>
            </SortCriterion>
        </Criteria>
    </ReportHead>
    <ReportBody>
        <ReportSection name="TripwireENT.demo.net" category="node">
            <OID>-1y2p0ij32e8bw:-1y2p0ij32e7cu</OID>
            <String name="typeName">Windows Server</String>
            <ReportSection name="Critical System Files" category="rule">
                <OID>-1y2p0ij32e7q2:-1y2p0ij31snh6</OID>
                <String name="typeName">Windows File System Rule</String>
                <ReportSection name="C:\Temp" category="element">
                    <OID>-1y2p0ij32e8dr:-1y2p0ij32e586</OID>
                    <ReportSection name="08/10/14 22:48" category="version">
                        <OID>-1y2p0ij32e8du:-1y2p0ij32e3ho</OID>
                        <Integer name="changeType">1</Integer>
                        <String name="changeTypeName">Added</String>
                        <Integer name="severity">10000</Integer>
                        <String name="severityName">High</String>
                        <Timestamp name="changeTime" displayvalue="08/10/14 22:48">1412779682000</Timestamp>
                        <String name="approvalId"></String>
                        <ReportSection name="attributes" category="attributes">
                            <ReportSection name="DACL" category="added">
                                <String name="observed">Inherits Entries: true
NT AUTHORITY\SYSTEM, Access Allowed:
Standard rights:
  Full Control
  Modify
  Read & Execute
  List Folder Contents
  Read
  Write
  Delete
  Read Control
  Write DAC
  Write Owner
  Synchronize
Specific rights:
  Full Control
  Traverse Folder / Execute File
  List Folder / Read Data
  Read Attributes
  Read Extended Attributes
  Create Files / Write Data
  Create Folders / Append Data
  Write Attributes
  Write Extended Attributes
  Directory Delete Child
  Read Permissions
  Change Permissions
  Take Ownership
Header flags:
  Object Inherit
  Container Inherit
  Inherited
BUILTIN\Administrators, Access Allowed:
Standard rights:
  Full Control
  Modify
  Read & Execute
  List Folder Contents
  Read
  Write
  Delete
  Read Control
  Write DAC
  Write Owner
  Synchronize
Specific rights:
  Full Control
  Traverse Folder / Execute File
  List Folder / Read Data
  Read Attributes
  Read Extended Attributes
  Create Files / Write Data
  Create Folders / Append Data
  Write Attributes
  Write Extended Attributes
  Directory Delete Child
  Read Permissions
  Change Permissions
  Take Ownership
Header flags:
  Object Inherit
  Container Inherit
  Inherited
BUILTIN\Users, Access Allowed:
Standard rights:
  Read & Execute
  List Folder Contents
  Read
  Read Control
  Synchronize
Specific rights:
  Traverse Folder / Execute File
  List Folder / Read Data
  Read Attributes
  Read Extended Attributes
  Read Permissions
Header flags:
  Object Inherit
  Container Inherit
  Inherited
BUILTIN\Users, Access Allowed:
Specific rights:
  Create Folders / Append Data
Header flags:
  Container Inherit
  Inherited
BUILTIN\Users, Access Allowed:
Specific rights:
  Create Files / Write Data
Header flags:
  Container Inherit
  Inherited
CREATOR OWNER, Access Allowed:
Generic rights:
  Generic All
Specific rights:
  Full Control
  Traverse Folder / Execute File
  List Folder / Read Data
  Read Attributes
  Read Extended Attributes
  Create Files / Write Data
  Create Folders / Append Data
  Write Attributes
  Write Extended Attributes
  Directory Delete Child
  Read Permissions
  Change Permissions
  Take Ownership
Header flags:
  Object Inherit
  Container Inherit
  Inherit Only
  Inherited
</String>
                            </ReportSection>
                            <ReportSection name="Group" category="added">
                                <String name="observed">TRIPWIREENT\None</String>
                            </ReportSection>
                            <ReportSection name="Owner" category="added">
                                <String name="observed">BUILTIN\Administrators</String>
                            </ReportSection>
                            <ReportSection name="Read-Only" category="added">
                                <String name="observed">false</String>
                            </ReportSection>
                            <ReportSection name="SACL" category="added">
                                <String name="observed">(null)</String>
                            </ReportSection>
                            <ReportSection name="Type" category="added">
                                <String name="observed">Directory</String>
                            </ReportSection>
                        </ReportSection>
                    </ReportSection>
                </ReportSection>
                <ReportSection name="C:\Windows\System32\drivers\etc\hosts" category="element">
                    <OID>-1y2p0ij32e8dr:-1y2p0ij32e4kp</OID>
                    <ReportSection name="08/10/14 23:08" category="version">
                        <OID>-1y2p0ij32e8du:-1y2p0ij32e3hk</OID>
                        <Integer name="changeType">2</Integer>
                        <String name="changeTypeName">Modified</String>
                        <Integer name="severity">10000</Integer>
                        <String name="severityName">High</String>
                        <Timestamp name="changeTime" displayvalue="08/10/14 23:08">1412780929000</Timestamp>
                        <String name="approvalId"></String>
                        <ReportSection name="attributes" category="attributes">
                            <ReportSection name="SHA-1" category="modified">
                                <String name="expected">de375d8a456a7345323babee88975ca567a2d5c4</String>
                                <String name="observed">3c5520382f91cb1cd898fee2da4eba3fa338d982</String>
                            </ReportSection>
                            <ReportSection name="Size" category="modified">
                                <String name="expected">829</String>
                                <String name="observed">854</String>
                            </ReportSection>
                        </ReportSection>
                    </ReportSection>
                </ReportSection>
            </ReportSection>
        </ReportSection>
        <ReportSection name="reportTotals" category="reportTotals">
            <Integer name="summary.nodeCount">1</Integer>
            <Integer name="summary.ruleCount">1</Integer>
            <Integer name="summary.elementCount">2</Integer>
        </ReportSection>
    </ReportBody>
</ReportOutput>

Hi Ritehere,
I know this is simple but am beginner in Powershell Script so I was looking for logic to go through however the output you provided is not what i am looking for and your script is too complicated, as under timestamp i wanted display value and correspoding
to display value the OID name and then name value correspoding to that OID. May be u got it wrong.
Thanks anyways.

How do I get a field to automatically select a value and change color based on another automatic field?

Here is the situation:
I have a row on a form called Finding Risk Rating. In this row are four fields: Probability, Severity, Risk Rating, Color.
Probability is a drop down menu with the following values: 1, 2, 3, 4, 5
Severity is a drop down menu with the following values: A, B, C, D, E
Risk Rating is a field that I have a custom calculation script:
var riskRating = this.getField("Probability").value+this.getField("Severity").value;
event.value = riskRating;
So, when I pick Probability = 1 and Severity = D, Risk Rating will automatically change to 1D, etc. This works fine on the surface as far as I can tell.
The part where I am stuck, is the fourth field Color.
Ideally, I want Color to be automatically populated depending on the value of Risk Rating. For example, for 1E I would want it to say "YELLOW" and the field to change color to yellow. For 1A it would be "GREEN" with the color green, etc.
I tried doing an if else for all cases, but it never refreshes to the correct value. I then checked using app.alert to see what fields riskRating and colorRank are (see code below), and I noticed that riskRating never changes, even though the value in Risk Rating changes. Is there a way to order script(s) so that if I execute one, the other will follow? I'm new to scripting for forms and haven't done any programming in 10+ years, so feel free to rip my code in favor or something more efficient, or direct me to a good resource I can learn from.
Here's the basis of what I have for scripting on Color. It's brief because I wanted to test it out before writing every 'if else' statement.
var colorRank;
var riskRating = this.getField("Risk Rating").value;
if (riskRating = "1E") colorRank = "YELLOW";
else if (riskRating = "1A") colorRank = "GREEN";
else if (riskRating = "5A") colorRank = "RED";
event.value = colorRank;
app.alert("colorRank = " + colorRank + ", riskRating = " + riskRating);
Any help is appreciated. Thanks!

One problem is if more than one combo box item has the same number associated with it, you cannot simply set the export value to the corresponding number since they need to be unique (or the user interface behaves weird). One thing you can do is set up an object to associate a list item with a value, and look up the value in code when a list item is selected.
For more information, see: http://acrobatusers.com/tutorials/2007/js_list_combo_livecycle

Sampling waveform values and writing corresponding time values

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