[time-nuts] Nifty "MINI TIC" for DMTD work

Erno Peres ernieperes at aol.com
Mon Nov 19 20:09:59 UTC 2012


Hi Gents,

please put me on the list. I should like to have  one unit or a KIT.

Rgds Ernie.




-----Original Message-----
From: Volker Esper <ailer2 at t-online.de>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Mon, Nov 19, 2012 8:57 pm
Subject: Re: [time-nuts] Nifty "MINI TIC" for DMTD work



'd like to be on the list. Definitely. Where do I have to pay?
Volker

m 19.11.2012 20:04, schrieb cdelect at juno.com:

 "MINI-TIC" for DMTD work


 Hi Everyone!

 I've been testing a Miniature 2 channel TIC that Bert Kehren and Juerg
 Koegel
 and Richard Mc Corkle have designed.

 It has 9 digits/Sec. and with a 1HZ offset in the DMTD unit gives a
 resolution of 1X10-15th  at 10 MHz, 2X10-15 with a 5 MHz input, when
 measuring
 Allan deviation. The 200 MHz version doubles the resolution.

 Of course the baseline performance of the DMTD unit and the stability of
 the DMTD reference determines the actual accuracy you can obtain.

 (My dual mixer has a baseline of approx. 8X10-14th at 1 second and my
 best reference is  4X10-13th at 1 second.)

 The "MINI" takes a 5 or 10 MHz reference that only has to be stable to
 parts in 10-8th/sec.
 I used a neat 14PIN ovenized DIP clock chip I got on eBay and recently
 discussed on the list.

 The reference is multiplied to 100Mhz for use as the counters clock.

 The "MINI" is about 2.5 by 2 inches and has only 5 chips. Two opto
 couplers an
 op amp for two analog channels are also on the board. If run on 5 volt a
 3.3 V
 regulator is also on the board. Power required is +5VDC 0.05 A  and +- 12

 (for the RS232 interface)

 It also has two pins you can individually ground to measure the period of
 the beat
 note from either channel.

 This allows you to adjust the offset frequency quickly and accurately.

 I installed the "MINI" into a 1U chassis with the power supply and also
 added "heartbeat" LEDS for each channel to show the presence of the 1PPS
 inputs.

 I have plotted several Rubidium and many Quartz using the "MINI"
 simultaneously with a SR620 counter/timer. The plots are "identical"! So
 much
 so that I am going to "retire" and sell my SR620!

 I understand work is complete on a 4 channel counters and Bluetooth
 interface,
 and work is ongoing on a LCD.

 The "MINI" material cost is less than $25.00 depending on how many
 boards are ordered!

 Resoution based on clock frequency and beat frequency:

 Carrier[MHz]  Beat [Hz]     Heterodyne    TIC [ns]   Resolution
 10101.00E+06101.00E-14
 1011.00E+07101.00E-15
 1011.00E+0755.00E-16
 10101.00E+0655.00E-15
 5105.00E+05102.00E-14
 515.00E+06102.00E-15
 515.00E+0651.00E-15
 5105.00E+0551.00E-14
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