Author Topic: EEVblog #452 - Stanford Research SR430 Teardown  (Read 6401 times)

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Offline poorchava

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Re: EEVblog #452 - Stanford Research SR430 Teardown
« Reply #1 on: April 09, 2013, 11:13:57 pm »
I saw a TEAPO capacitor. One of the most recognized "bad caps" brand  :--
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Offline free_electron

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Re: EEVblog #452 - Stanford Research SR430 Teardown
« Reply #2 on: April 10, 2013, 01:07:37 am »
Reamwood avenue They're still there.. just a few traffic lights away from where i am.
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Offline Cognito

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Re: EEVblog #452 - Stanford Research SR430 Teardown
« Reply #3 on: April 10, 2013, 05:37:40 pm »
I noticed one thing on the PCB for the CRT. It seems that it uses four brands of electrolytic capacitors, based purely on the color. I don't know if that is usual or not, but why did they decide to do it anyway?

Great teardown Dave! I always learn alot :D
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Offline bitwelder

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Re: EEVblog #452 - Stanford Research SR430 Teardown
« Reply #4 on: April 11, 2013, 04:25:13 pm »
Dave, did you clean/vacuum the boards before shooting the video?
They were spectacularly clean for having 20 years of service behind.

Offline Scott

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Re: EEVblog #452 - Stanford Research SR430 Teardown
« Reply #5 on: April 11, 2013, 09:40:38 pm »
Digikey carries the BPV10 photodiode and it has a 2.5 nS rise time and only costs $0.86.

Thorlabs charges $150US for a DET10A which is a 1 ns rise time Si diode in a nice box with a bias battery. The FDS02 diode from Thorlabs is $74, but has a 47 pS rise time. It's in a nice FC/PC mount so you can screw it onto the end of a fiber optic cable.

They charge $42 for a bare 1 nS rise Si diode, so that BPV10 is a great value.

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Offline CarlG

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Re: EEVblog #452 - Stanford Research SR430 Teardown
« Reply #6 on: April 12, 2013, 09:17:15 pm »
Interesting video :-+  of a long lived instrument! Surprisingly (at least to me) it's still running at SRS, would you believe it?!!

Suggested use from the datasheet:
The SR430 is useful in a variety of applications where it
is necessary to count events as a function of time: LIDAR,
time of flight mass spectroscopy, and fluorescence decay
measurements are just a few examples.

Obvious, isn't it ;)

The -2V is the ECL termination voltage, not mentioned in the video I think.

Interestingly, it's 10H ECL series, not 100H, that is temperature compensated. Maybe a price issue, or that 100K was rather new at that time (correct me if I'm wrong). Or maybe 100H wasn't even invented then; I lost track somewhere in the beginning of the 90's. A lot of new ECL logic families seem to have emerged since then :)

Note also that ECL basically is "constant current" i.e. a device draws the same current in either state as well as during switching. Of course, the decaps are still needed :)

I think that the refdes starting number is defined by the schematic sheet number, e.g. 1000-series on sheet 10. I prefer to number passives along that scheme in multisheet schematics.

EDIT: for the interested: Onsemi 10H/10K app note
« Last Edit: April 12, 2013, 09:24:53 pm by CarlG »


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Re: EEVblog #452 - Stanford Research SR430 Teardown
« Reply #7 on: June 03, 2013, 08:02:11 am »
can someone explain more about the Oscillator Dave is Explaining from Minute 33:25~34:41

It has a 25MHz PLETRONICS P1100HC, is rare to see an XO with so many .000000
TCXO with 1ppm has only .0000
near has a 74HC191 counter...?

bottom has a schmitt trigger working as a Oscillator, MC10H116P.
from the resistor ^ the cap to ground looks like a Osc.
L301 looks like a variable coil.

how oscillates at 200MHz_?
has 0.5~1.6ns Rise & Fall, pretty decent, but enough for 200MHz_? 300Mhz oscilloscope has 1ns Rise & Fall.  could be.

goes to the SP4633 /64 prescaler high speed 1Ghz divider... _? that means the Schmitt LC-Osc is generating more than 200MHz_?

MC10H125 quad translator for interfacing data and control signals between the MECL section and saturated logic section of
digital systems.? has a Rise&Fall 0.3~1.2ns. im lost here, could it be just to change the voltages to something the next understands_?

the MC10Hc125P goes to the MM74HC4046 PLL... the VCO has 12MHz ?

the LF411cn jfet op-amp with a bandwith of 4Mhz ?
exept the op-amp most are negative voltages.
the op-amp is just a buffer,?


f= 200MHz

Why a XO if has an LC_?

Logic would be the Schmitt for cleaning up the clock, and dividing for a lower frequency... but the L301 does not fit in the equation.
« Last Edit: June 03, 2013, 08:33:54 am by JuanPC »

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