NVGate time shift resampling - Revision history

Lmagimel at 09:05, 26 November 2024

2024-11-26T09:05:16Z

← Older revision		Revision as of 11:05, 26 November 2024
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			[[category:WikiOros]]
	Time Shift Resampling with OROS Analyzer and NVGate software		Time Shift Resampling with OROS Analyzer and NVGate software

LDesmet: English edits

2020-06-18T21:13:55Z

English edits

Lmagimel: /* Benefits of Time shift resampling */

2020-04-29T15:31:45Z

Benefits of Time shift resampling

← Older revision		Revision as of 17:31, 29 April 2020
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	Picture 3: Time domain averaging in FFT		Picture 3: Time domain averaging in FFT

	==== Precision calculation:====		=== Precision calculation:===

	===== Without time shift resampling=====		==== Without time shift resampling====

	Standard absolute phase error calculation without time shift resampling can be determined as follow (worst case where event occurs right after last sample)		Standard absolute phase error calculation without time shift resampling can be determined as follow (worst case where event occurs right after last sample)
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	for instance for a total analysis band of 20kHz, maximum error at 10kHz frequency will be Phase<sub>error</sub> = (360/2.56)*10/20 = 70.3 deg		for instance for a total analysis band of 20kHz, maximum error at 10kHz frequency will be Phase<sub>error</sub> = (360/2.56)*10/20 = 70.3 deg

	===== With Time shift resampling=====		==== With Time shift resampling====

	Standard absolute phase error calculation with Time Shift Resampling can be determined as follow (worst case where event occurs right after 1/16<sup>th</sup> of a sample )		Standard absolute phase error calculation with Time Shift Resampling can be determined as follow (worst case where event occurs right after 1/16<sup>th</sup> of a sample )

Lmagimel: /* SUBJECT: Time Shift Resampling in OR3x */

2020-04-29T15:31:02Z

SUBJECT: Time Shift Resampling in OR3x

← Older revision		Revision as of 17:31, 29 April 2020
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	Time Shift Resampling with OROS Analyzer and NVGate software		Time Shift Resampling with OROS Analyzer and NVGate software

			===Introduction===
	This document intends to highlight internal signal processing of OR3x with regards to phase precision of Time trigger blocks in NVGate. When trigger event occurs in between two samples of acquisition error may be introduced in absolute phase measurement of the acquired Time block (see Picture 1). Enhanced signal processing of NVGate enables to minimize this error by finding start of trigger even with a much higher precision and performing time shift resampling.		This document intends to highlight internal signal processing of OR3x with regards to phase precision of Time trigger blocks in NVGate. When trigger event occurs in between two samples of acquisition error may be introduced in absolute phase measurement of the acquired Time block (see Picture 1). Enhanced signal processing of NVGate enables to minimize this error by finding start of trigger even with a much higher precision and performing time shift resampling.

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	----		----

	===~~==/~~ Principles of OR3x enhanced acquisition=====		=== Principles of OR3x enhanced acquisition===

	~~'''a/~~ oversampled External Sync input~~'''~~		==== oversampled External Sync input====

	OR3x Front end features 2 External Sync inputs (2 logic inputs) that have integrated pre-divider enabling oversampling of external trigger channel. For instance when Input Front End Sampling is set to 102.4kS/s (40 kHz bandwidth) External Sync 1 and 2 have detection precision equivalent to 6.5MHz (#102.4*64). Trigger event resolution therefore increases from 9.7 micro seconds (sample rate @ 102.4 kS/s) to 151 nano seconds.		OR3x Front end features 2 External Sync inputs (2 logic inputs) that have integrated pre-divider enabling oversampling of external trigger channel. For instance when Input Front End Sampling is set to 102.4kS/s (40 kHz bandwidth) External Sync 1 and 2 have detection precision equivalent to 6.5MHz (#102.4*64). Trigger event resolution therefore increases from 9.7 micro seconds (sample rate @ 102.4 kS/s) to 151 nano seconds.

	~~'''b/~~ Time Shift Resampling~~'''~~		====Time Shift Resampling====

	Enhanced signal processing of OR3x enable phase improvement of trigger block by time resampling of acquired trigger block (at sampling frequency) with a resolution of 1/16<sup>th</sup> of a sample. This is made according to the External Sync precise start event. (See Picture 2)		Enhanced signal processing of OR3x enable phase improvement of trigger block by time resampling of acquired trigger block (at sampling frequency) with a resolution of 1/16<sup>th</sup> of a sample. This is made according to the External Sync precise start event. (See Picture 2)

	~~----~~

	[[Image:Time_shift_resampling_02.png\|framed\|none]]		[[Image:Time_shift_resampling_02.png\|framed\|none]]

	===~~==/~~ Benefits of Time shift resampling=====		=== Benefits of Time shift resampling===

	Signal processing for time shift resampling is automatically engaged when "Time" averaging is selected in NVGate FFT plug in (see Picture 3).		Signal processing for time shift resampling is automatically engaged when "Time" averaging is selected in NVGate FFT plug in (see Picture 3).
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	[[Image:Time_shift_resampling_03.png\|framed\|none]]		[[Image:Time_shift_resampling_03.png\|framed\|none]]

	~~===~~Picture 3: Time domain averaging in FFT~~===~~		Picture 3: Time domain averaging in FFT

	~~<font size~~ = ~~"4">'''4/~~ Precision calculation:~~'''</font>~~		==== Precision calculation:====

	~~'''a/~~ Without time shift resampling~~'''~~		===== Without time shift resampling=====

	Standard absolute phase error calculation without time shift resampling can be determined as follow (worst case where event occurs right after last sample)		Standard absolute phase error calculation without time shift resampling can be determined as follow (worst case where event occurs right after last sample)
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	for instance for a total analysis band of 20kHz, maximum error at 10kHz frequency will be Phase<sub>error</sub> = (360/2.56)*10/20 = 70.3 deg		for instance for a total analysis band of 20kHz, maximum error at 10kHz frequency will be Phase<sub>error</sub> = (360/2.56)*10/20 = 70.3 deg

	~~'''b/~~ With Time shift resampling~~'''~~		===== With Time shift resampling=====

	Standard absolute phase error calculation with Time Shift Resampling can be determined as follow (worst case where event occurs right after 1/16<sup>th</sup> of a sample )		Standard absolute phase error calculation with Time Shift Resampling can be determined as follow (worst case where event occurs right after 1/16<sup>th</sup> of a sample )

Lmagimel: /* SUBJECT: Time Shift Resampling in OR3x */

2020-04-29T15:25:50Z

SUBJECT: Time Shift Resampling in OR3x

← Older revision		Revision as of 17:25, 29 April 2020
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	~~==SUBJECT:~~ Time Shift Resampling ~~in OR3x<br>==~~		Time Shift Resampling with OROS Analyzer and NVGate software

	~~'''Hardware Version :''' OR3x~~

	~~'''Software version :''' any~~

	~~=====/ Introduction=====~~

	This document intends to highlight internal signal processing of OR3x with regards to phase precision of Time trigger blocks in NVGate. When trigger event occurs in between two samples of acquisition error may be introduced in absolute phase measurement of the acquired Time block (see Picture 1). Enhanced signal processing of NVGate enables to minimize this error by finding start of trigger even with a much higher precision and performing time shift resampling.		This document intends to highlight internal signal processing of OR3x with regards to phase precision of Time trigger blocks in NVGate. When trigger event occurs in between two samples of acquisition error may be introduced in absolute phase measurement of the acquired Time block (see Picture 1). Enhanced signal processing of NVGate enables to minimize this error by finding start of trigger even with a much higher precision and performing time shift resampling.

Lmagimel: Created page with "==SUBJECT: Time Shift Resampling in OR3x
== '''Hardware Version :''' OR3x '''Software version :''' any =====/ Introduction===== This document intends to highl..."

2020-04-29T15:20:55Z

Created page with "==SUBJECT: Time Shift Resampling in OR3x == '''Hardware Version :''' OR3x '''Software version :''' any =====/ Introduction===== This document intends to highl..."

New page

==SUBJECT: Time Shift Resampling in OR3x ==

'''Hardware Version :''' OR3x

'''Software version :''' any

=====/ Introduction=====

This document intends to highlight internal signal processing of OR3x with regards to phase precision of Time trigger blocks in NVGate. When trigger event occurs in between two samples of acquisition error may be introduced in absolute phase measurement of the acquired Time block (see Picture 1). Enhanced signal processing of NVGate enables to minimize this error by finding start of trigger even with a much higher precision and performing time shift resampling.

[[Image:Time_shift_resampling_01.png|framed|none]]

----

=====/ Principles of OR3x enhanced acquisition=====

'''a/ oversampled External Sync input'''

OR3x Front end features 2 External Sync inputs (2 logic inputs) that have integrated pre-divider enabling oversampling of external trigger channel. For instance when Input Front End Sampling is set to 102.4kS/s (40 kHz bandwidth) External Sync 1 and 2 have detection precision equivalent to 6.5MHz (#102.4*64). Trigger event resolution therefore increases from 9.7 micro seconds (sample rate @ 102.4 kS/s) to 151 nano seconds.

'''b/ Time Shift Resampling'''

Enhanced signal processing of OR3x enable phase improvement of trigger block by time resampling of acquired trigger block (at sampling frequency) with a resolution of 1/16th of a sample. This is made according to the External Sync precise start event. (See Picture 2)

----

[[Image:Time_shift_resampling_02.png|framed|none]]

=====/ Benefits of Time shift resampling=====

Signal processing for time shift resampling is automatically engaged when "Time" averaging is selected in NVGate FFT plug in (see Picture 3).

When "Time" averaging mode is selected, precision of absolute phase of the trigger block signal is therefore increased by a factor of 16.

[[Image:Time_shift_resampling_03.png|framed|none]]

===Picture 3: Time domain averaging in FFT===

'''4/ Precision calculation:'''

'''a/ Without time shift resampling'''

Standard absolute phase error calculation without time shift resampling can be determined as follow (worst case where event occurs right after last sample)

Phaseerror = (360/2.56)*f/fe

Where f is the frequency of interest

fe is the frequency band of analysis

for instance for a total analysis band of 20kHz, maximum error at 10kHz frequency will be Phaseerror = (360/2.56)*10/20 = 70.3 deg

'''b/ With Time shift resampling'''

Standard absolute phase error calculation with Time Shift Resampling can be determined as follow (worst case where event occurs right after 1/16th of a sample )

TSR_Phaseerror = (360/<nowiki>[</nowiki>2.56*16<nowiki>]</nowiki>)*f/fe

Where f is the frequency of interest

fe is the frequency band of analysis

for instance for a total analysis band of 20kHz, maximum error at 10kHz frequency will be TSR_Phaseerror = (360/<nowiki>[</nowiki>2.56*16<nowiki>]</nowiki>)*10/20 = 4.4 deg

'''NOTE''' : time shift oversampling does not affect the phase match between channels (10V range, 0 to 20kHz , <nowiki>+</nowiki>/- 0.02deg on OR36-OR38) it only improves absolute phase information of acquired time block.

← Older revision		Revision as of 23:13, 18 June 2020
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	===Introduction===		===Introduction===
	This document intends to highlight internal signal processing of OR3x with regards to phase precision of Time trigger blocks in NVGate. When trigger event occurs in between two samples of acquisition error may be introduced in absolute phase measurement of the acquired Time block (see Picture 1). Enhanced signal processing of NVGate ~~enables~~ to minimize this error by finding start of trigger even with a much higher precision and performing time shift resampling.		This document intends to highlight internal signal processing of OR3x with regards to phase precision of Time trigger blocks in NVGate. When trigger event occurs in-between two samples of acquisition an error may be introduced in absolute phase measurement of the acquired Time block (see Picture 1). Enhanced signal processing of NVGate allows a user to minimize this error by finding start of trigger even with a much higher precision and performing time shift resampling.

	[[Image:Time_shift_resampling_01.png\|framed\|none]]		[[Image:Time_shift_resampling_01.png\|framed\|none]]
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	=== Principles of OR3x enhanced acquisition===		=== Principles of OR3x enhanced acquisition===

	==== ~~oversampled~~ External Sync input====		==== Oversampled External Sync input====

	OR3x Front end features 2 External Sync inputs (2 logic inputs) that have integrated pre-divider enabling oversampling of external trigger channel. For instance when Input Front End Sampling is set to 102.4kS/s (40 kHz bandwidth) External Sync 1 and 2 have detection precision equivalent to 6.5MHz (#102.4*64). Trigger event resolution therefore increases from 9.7 micro seconds (sample rate @ 102.4 kS/s) to 151 nano seconds.		OR3x Front-end features 2 External Sync inputs (2 logic inputs) that have integrated pre-divider enabling oversampling of external trigger channel. For instance, when Input Front End Sampling is set to 102.4kS/s (40 kHz bandwidth) External Sync 1 and 2 have detection precision equivalent to 6.5MHz (#102.4*64). Trigger event resolution therefore increases from 9.7 micro seconds (sample rate @ 102.4 kS/s) to 151 nano seconds.

	====Time Shift Resampling====		====Time Shift Resampling====

	Enhanced signal processing of OR3x enable phase improvement of trigger block by time resampling of acquired trigger block (at sampling frequency) with a resolution of 1/16<sup>th</sup> of a sample. This is made according to the External Sync ~~precise~~ start event. (See Picture 2)		Enhanced signal processing of OR3x enable phase improvement of trigger block by time resampling of acquired trigger block (at sampling frequency) with a resolution of 1/16<sup>th</sup> of a sample. This is made according to the External Sync precison start event. (See Picture 2)


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	==== Without time shift resampling====		==== Without time shift resampling====

	Standard absolute phase error calculation without time shift resampling can be determined as ~~follow~~ (worst case ~~where~~ event occurs right after last sample)		Standard absolute phase error calculation without time shift resampling can be determined as follows (worst case event occurs right after last sample)

	Phase<sub>error</sub> = (360/2.56)*f/f<sub>e</sub>		Phase<sub>error</sub> = (360/2.56)*f/f<sub>e</sub>
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	f<sub>e </sub>is the frequency band of analysis		f<sub>e </sub>is the frequency band of analysis

	~~for~~ instance for a total analysis band of 20kHz, maximum error at 10kHz frequency will be Phase<sub>error</sub> = (360/2.56)*10/20 = 70.3 deg		For instance, for a total analysis band of 20kHz, maximum error at 10kHz frequency will be Phase<sub>error</sub> = (360/2.56)*10/20 = 70.3 deg

	==== With Time shift resampling====		==== With Time shift resampling====

	Standard absolute phase error calculation with Time Shift Resampling can be determined as follow (worst case ~~where~~ event occurs right after 1/16<sup>th</sup> of a sample )		Standard absolute phase error calculation with Time Shift Resampling can be determined as follow (worst case event occurs right after 1/16<sup>th</sup> of a sample)

	TSR_Phase<sub>error</sub> = (360/<nowiki>[</nowiki>2.5616<nowiki>]</nowiki>)f/f<sub>e</sub>		TSR_Phase<sub>error</sub> = (360/<nowiki>[</nowiki>2.5616<nowiki>]</nowiki>)f/f<sub>e</sub>
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	f<sub>e </sub>is the frequency band of analysis		f<sub>e </sub>is the frequency band of analysis

	~~for~~ instance for a total analysis band of 20kHz, maximum error at 10kHz frequency will be TSR_Phase<sub>error</sub> = (360/<nowiki>[</nowiki>2.5616<nowiki>]</nowiki>)10/20 = 4.4 deg		For instance, for a total analysis band of 20kHz, maximum error at 10kHz frequency will be TSR_Phase<sub>error</sub> = (360/<nowiki>[</nowiki>2.5616<nowiki>]</nowiki>)10/20 = 4.4 deg

	'''NOTE''' : ~~time~~ shift oversampling does not affect the phase match between channels (10V range, 0 to 20kHz , <nowiki>+</nowiki>/- 0.02deg on OR36-OR38) it only improves absolute phase information of acquired time block.		'''NOTE''' : Time shift oversampling does not affect the phase match between channels (10V range, 0 to 20kHz , <nowiki>+</nowiki>/- 0.02deg on OR36-OR38) it only improves absolute phase information of acquired time block.

NVGate time shift resampling - Revision history

Lmagimel at 09:05, 26 November 2024

LDesmet: English edits

Lmagimel: /* Benefits of Time shift resampling */

Lmagimel: /* SUBJECT: Time Shift Resampling in OR3x */

Lmagimel: /* SUBJECT: Time Shift Resampling in OR3x */

Lmagimel: Created page with "==SUBJECT: Time Shift Resampling in OR3x== '''Hardware Version :''' OR3x '''Software version :''' any =====/ Introduction===== This document intends to highl..."

Lmagimel: Created page with "==SUBJECT: Time Shift Resampling in OR3x
== '''Hardware Version :''' OR3x '''Software version :''' any =====/ Introduction===== This document intends to highl..."