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[scopehal-apps] azonenberg closed issue #42: Figure out how/when to flush cache and load configuration from scope - https://git.io/fjcPI
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<bvernoux>
does anyone here know a good frequency counter ?
<bvernoux>
especially with GPSDO option
<bvernoux>
so far I have only found HP Agilent Keysight 53181A / 53230A but they also requires option to go at more than 225Mhz...
<bvernoux>
but unfortunately they are not with Ethernet only GPIB or RS232 ...
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<tnt>
bvernoux: I use the keysight you mentionned. Option board can be self made pretty easily.
<bvernoux>
ha really ?
<tnt>
but yeah, gpib ... I have a gpib 2 ethernet conecting a bunch of my old gear.
<bvernoux>
you are using 53181A ?
<tnt>
oh sorry my font is too small, it's a 53131 :/
<bvernoux>
yes it is similar anyway
<bvernoux>
I search something with > 3Ghz
<bvernoux>
I have found something amazing ;)
<bvernoux>
20GHz version
<bvernoux>
on eBay
<bvernoux>
53147A HP AGILENT MICROWAVE FREQ COUNTERPOWER
<tnt>
Oh nice. And working ? Those often use SRD input stages that are basically impossible to repair if not.
<bvernoux>
it is wrote as working and calibrated in 2010 ...
<tnt>
Ah this one uses external sampling head.
<bvernoux>
I need to check what is the price of calibration to be sure all is good
<tnt>
bvernoux: nope never really looked at calibration prices.
<bvernoux>
I do not know what they calibrate in such hw except the clock
<bvernoux>
but it is wrote they check everything
<tnt>
Clock and the power head ...
<bvernoux>
ha yes ;)
<tnt>
But they do also perform a bunch of checks which are described in the service manual to check sensitivity and things like that.
<bvernoux>
yes it is why it is a must especialy to check all is fine
<bvernoux>
even if I probably do not plan to calibrate it every year depending on the price they ask which is suspect is something like > 500USD
<tnt>
Do you have a calibration lab nearby ? Because shipping back and forth is already expensive on its own :/
<bvernoux>
no i do not have
<azonenberg>
Re freq counting, personally i would just use a nice comparator like the HMC675
<azonenberg>
For up to ~1 GHz, you can do it discretely
<azonenberg>
with FPGA GPIO
<azonenberg>
just count pulses for say 1K GPSDO edges
<azonenberg>
1M*
<azonenberg>
For higher frequency use an external TFF or two to divide it down
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<azonenberg>
bvernoux: for most stuff in the past i have not bothered with periodic calibration
<azonenberg>
For the kinds of work i do i need high bandwidth but even 1% or so of drift is a non-issue
<azonenberg>
If i can tell a nice clean rising edge from one with steps and ringing in it, i'm happy
<azonenberg>
and if my 450ps edge is actually 455ps that doesn't matter
<azonenberg>
i'm not doing compliance testing or anything like that, i'm debugging
<azonenberg>
bvernoux: I expect this channel to kinda shift in the direction of f/oss hardware test equipment in the future as the toolchain and hardware support in the software stack improves
<azonenberg>
So if you have a wishlist for a freq counter we can definitely keep that in mind
<bvernoux>
yes
<bvernoux>
the aim is to have tools to validate HW
<bvernoux>
I have found very interesting links to upgrade Agilent Freq Counter with OSHW ;)