Re: [time-nuts] TICC TAPR and TimeLab

[Lester Veenstra via time-nuts]

John:

   Thanks for the detailed reply.  As I have said befire: No good deed goes 
unpunished. So another question.

How do I get Timelab to sit up and play nice?

 

I have the TICC cranking away with 10 MHz ref ans 1 PPS Chan A, both from the 
same locked GPSDO.

 



 

# TAPR TICC Timestamping Counter

# Copyright 2017 N8UR, K9TRG, NH6Z, WA8YWQ

 

#

# TICC Configuration: 

# Measurement Mode: Timestamp

# EEPROM Version: 7, Board Version: D

# Software Version: 20170108.1

# Board Serial Number: 60E9C41C

# Clock Speed: 1000

# Coarse tick (ps): 1

# Cal Periods: 20

# SyncMode: M

# Timeout: 0x05

# Time Dilation: 2500 (chA), 2500 (chB)

# FIXED_TIME2: 0 (chA), 0 (chB)

# FUDGE0: 0 (chA), 0 (chB)

#

# Type any character for config menu

# 

 

# timestamp (seconds)

1.305417041697 chA

2.305417036529 chA

3.305417052122 chA

4.305417047247 chA

5.305417042429 chA

6.305417037252 chA

 

-

And I have Timelab capturing this, nut after an hour the collection stops with 
“Insifficient data ..:

--



 



 

 

Lester B Veenstra  K1YCM  MØYCM  W8YCM   6Y6Y

les...@veenstras.com

 

452 Stable Ln (HC84 RFD USPS Mail)

Keyser WV 26726

 

GPS: 39.336826 N  78.982287 W (Google)

GPS: 39.33682 N  78.9823741 W (GPSDO)

 

 

Telephones:

Home: +1-304-289-6057

US cell+1-304-790-9192 

Jamaica cell:   +1-876-456-8898 

 

 

 

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Re: [time-nuts] TICC TAPR and TimeLab

[John Ackermann N8UR]

Some answers below.

John

On 7/3/20 10:54 AM, w8ycm--- via time-nuts wrote:

New guy here needs help using the TAPT TICC and Timelab software

  


The TICC documentation, I am sure, is sufficient to those in the community,
but to someone who has only lurked around the edges, there are a few
questions I have.   I suspect some are obvious, and some others of no
consequence, so here goes:

M   Measurement ModeT   default T
S   clock Speed  (MHz) 10.00   default 10
C   Coarse Clock Rate (us)  100.00  default 100
P   calibration Periods   20  default 20
T   Timeout0x05default 0x05
Y   sync:  master / slave   M   default M
E   trigger EdgeR R default R
D   time Dilation2500 2500   default 2500
F   Fixed Time20 0 default 0
G   fudge00 0 default 0

(1) In  M (Measurement mode), what is the use for the “  L TimeLab
interval mode “?  Should it only be used with Timelab? If “Yes” skip  and b:


"TimeLab" mode is a special configuration for doing three-corner hat 
measurements.  Don't use it unless you know what those are, and why they 
may not work. :-)




a.In  M (Measurement mode), the  functions of the T/P/I,
modes are reasonably obvious,

   but with ones should be used with Timelab to compute Allan Deviation.




TimeLab works in "normal" fashion with either time interval, or one or 
two channel timestamp, data.  Of course, you need to configure TimeLab 
to match what's coming out of the TICC.



b.Are any of the Measurement modes of particular use in
other Timelab functions?


You could probably kludge the period data mode to work with TimeLab, but 
that one would not normally be used for a typical stability analysis. 
It shows the period (inverse of frequency) of the input channel.



All of the following questions could be answered with, "Leave them alone 
unless you're doing hardware or software development" but I'll try to 
provide some info.  To make much sense of it, you would need to study 
the TICC schematics and source code, and also spend some quality time 
with the TDC7200 chip data sheet.



(2)  In  M (Measurement mode), what does one do with “ D Debug
mode”?


Nothing, unless you're working on the code.  That mode outputs the raw 
data values used within the system and is for testing purposes.




(3)  What is the rational for selecting a  particular “Coarse Clock
Rate” value?


The Coarse Clock needs to match the hardware configuration.  Unless 
you're changing the TICC hardware (or the PIC divider chip), don't 
change this.




(4)  What is the rational for selecting a particular  “calibration
Periods” value?


Trade-off of measurement speed vs. calibration accuracy.



(5)  What is the rational for selecting a particular  “Timeout” value?


Trade-off of measurement speed vs. proper operation.


(6)  What is the rational for selecting a particular  “time Dilation”
value?


There's a small non-linearity in the TDC7200 chip output and this value 
compensates for that.  It's determined experimentally and seems to be 
about the same in all units.



(7)  What do the “Fixed Time” options do, and why?


It's an experimental configuration option that in theory could provide 
slightly less jitter in the results.  We haven't proven whether or not 
it actually does.



(8) What do the “Fudge” options do, and why?


These allow you to "trim" the results to account for slightly differing 
cable lengths or path delays.  By experimental adjustment, you can use 
there to match the channel A and channel B results to compensate for 
these variations.  It's not normally necessary to mess with them.


John

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[time-nuts] TICC TAPR and TimeLab

[w8ycm--- via time-nuts]

New guy here needs help using the TAPT TICC and Timelab software

 

The TICC documentation, I am sure, is sufficient to those in the community,
but to someone who has only lurked around the edges, there are a few
questions I have.   I suspect some are obvious, and some others of no
consequence, so here goes:

 

 

M   Measurement ModeT   default T

S   clock Speed  (MHz) 10.00   default 10

C   Coarse Clock Rate (us)  100.00  default 100

P   calibration Periods   20  default 20

T   Timeout0x05default 0x05

Y   sync:  master / slave   M   default M

E   trigger EdgeR R default R

D   time Dilation2500 2500   default 2500

F   Fixed Time20 0 default 0

G   fudge00 0 default 0

 

(1) In  M (Measurement mode), what is the use for the “  L TimeLab
interval mode “?  Should it only be used with Timelab? If “Yes” skip  and b:

a.In  M (Measurement mode), the  functions of the T/P/I,
modes are reasonably obvious, 

  but with ones should be used with Timelab to compute Allan Deviation.


b.Are any of the Measurement modes of particular use in
other Timelab functions?

 

(2)  In  M (Measurement mode), what does one do with “ D Debug
mode”?

(3)  What is the rational for selecting a  particular “Coarse Clock
Rate” value?

(4)  What is the rational for selecting a particular  “calibration
Periods” value?

(5)  What is the rational for selecting a particular  “Timeout” value?

(6)  What is the rational for selecting a particular  “time Dilation”
value?

(7)  What do the “Fixed Time” options do, and why?

(8) What do the “Fudge” options do, and why?

 

 

Lester B Veenstra  K1YCM  MØYCM  W8YCM   6Y6Y

  les...@veenstras.com

 

452 Stable Ln (HC84 RFD USPS Mail)

Keyser WV 26726

 

GPS: 39.336826 N  78.982287 W (Google)

GPS: 39.33682 N  78.9823741 W (GPSDO)

 

 

Telephones:

Home: +1-304-289-6057

US cell+1-304-790-9192 

Jamaica cell:   +1-876-456-8898 

 

 

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