[chbot] Diligent USB test tools

Sun Apr 9 22:34:32 BST 2017

On Sun, Apr 9, 2017 at 7:06 PM, Mark Atherton <markaren1 at xtra.co.nz> wrote:

> Which Salaea do you have Charles ?
>

I have one of the old original ones: 8-bt, 24MHz devices they don't sell
any more. The new devices are up to 100MHz. Small print: you probably can
only get 100MHz if you're sampling 2 or 4 bits.

At one customer's place there was a problem with some SPI comms getting
screwed up. Very intermittent (one per hour or more). They had a $20k logic
analyser with about a 1-minute deep buffer. Could not catch the problem.

We set up the salaea and ran it for an hour. Problem captured. Problem
fixed 20 minutes later.

>
> -Mark
>
>
> On 9/04/2017 6:24 PM, Charles Manning wrote:
>
> I'm with Mike on this.
>
> Nice looking kit, but a real pity it only has 16k buffers.
>
> Being able to stream with the Salaea makes for something quite amazing.
> I've used it for logging, then analysing many hours of samples.
>
>
> On Sun, Apr 9, 2017 at 3:24 PM, Matthew Pike <jumbledthoughts389 at hotmail.
> com> wrote:
>
>> Seems like my shopping kart link doesn't work (at least not on my smart
>> phone).
>> These are the items I was referring to:
>>
>> $442.86    Analog Discovery 2         http://www.digikey.co.nz/produ
>> ct-detail/en/digilent-inc/410-321/1286-1117-ND/5810115
>>  $23.79    Set of 6 Mini Grabbers     http://www.digikey.co.nz/produ
>> ct-detail/en/digilent-inc/240-052/1286-1050-ND/4090099
>>  $31.73    BNC Adaptor board          http://www.digikey.co.nz/produ
>> ct-detail/en/digilent-inc/410-263/1286-1073-ND/4840860
>>  $31.73    2 BNC Oscilloscope Probes  http://www.digikey.co.nz/produ
>> ct-detail/en/digilent-inc/460-004/1286-1075-ND/4840870
>> $530.11    (Total)
>>
>> I can stand to skip the mini grabbers, and maybe get cheaper BNC probes
>> elsewhere, but I am still looking at ~$500.
>> That's the most I've every considered spending on electronics equipment.
>> Christchurch Robotics may be bad for my wallet :)
>>
>>
>> Matt Pike
>>
>> On 8/04/2017 11:09 a.m., Matthew Pike wrote:
>>
>> Looks good to me - I'm going for the Pro Bundle, as I'd like some BNC
>> scope probes with it.
>>
>> Here's a shopping kart at Digi-Key, with the equivalent items. $530.11. (
>> http://www.digikey.co.nz/short/3w53b8)
>>
>> If you just want the scope, $442.86 from Digi-Key. Much better than
>> Element 14 or RS-Online
>>
>>
>> Matt Pike
>>
>> On 5/04/2017 6:57 a.m., Mike Field wrote:
>>
>> If anybody wants to try before they buy I can lend you mine for a few
>> days.
>>
>> Pretty much a jack of all trades, master of none - main restriction being
>> usable bandwidth and sample buffer sizes are limited.
>>
>> For purely digital work a Saleae is 100x better as samples are streamed
>> to the PC for analysis and decode.
>>
>> For analogue work a low end Scope with real probes is better/usable, and
>> has more bandwidth.
>>
>> Any bench PSU would be a better PSU.
>>
>> But it is integration of all the functions that is awesome, esp between
>> the signal generator and the scope inputs (so you can test phase and freq
>> response of the system under test).
>>
>> However it does fit in the palm of your hand, making it handy if working
>> within its limitations. Much like any Swiss Army Knife/Leatherman tool I
>> guess
>>
>> Mike
>>
>>
>>
>> -------- Original Message --------
>> Subject: [chbot] Diligent USB test tools
>> From: Mark Atherton
>> To: Christchurch Robotics
>> CC:
>>
>>
>> All,
>>
>> Have just been forwarded this message, and am taking the liberty of
>> passing it on, since it had been forwarded sever times before it reached
>> me...
>>
>> Looks like they are $568.84 from element 14, even so, an interesting
>> piece of kit.
>>
>> -Mark
>>
>> =========================
>>
>> Just received an Analog Discovery 2 unit for $279 -
>> http://store.digilentinc.com/analog-discovery-2-100msps-usb-
>> oscilloscope-logic-analyzer-and-variable-power-supply/
>>
>> - Farnell have them for about GBP 220
>> http://uk.farnell.com/digilent/410-321/oscilloscope-usb-2-
>> ch-30mhz-100msps/dp/2528523
>> .
>>
>> This is an interesting bit of kit - it's a cooperation between Analog
>> Devices (who do all the signal conditioning and interfacing) and Xilinx,
>> who do the logic, but put together by Digilent, who sell Xilinx
>> development systems... Initially just a reference design, i.e. a
>> technical paper, they realised that they had something pretty neat on
>> their hands, so made it a product.
>>
>> The design has turned into a really cool bit of kit at a very acceptable
>> price - a full design rationale is available as are all the schematics
>> etc. in the reference manual (also on the Farnell page). Its a really
>> nice unit... Two programmable supplies, 2 waveform generator channels,
>> 16 logic channels. Lots of analog too. 14-bit A/D/A as well, not the
>> usual 12-bit...
>>
>> Very few compromises have been made - by using 14-bit DACs and ADCs, it
>> compares very favorably with far more expensive units. The software is
>> also extremely stable.
>>
>> As a small unit to keep with the laptop, there's not a lot to argue
>> about... I keep mine with the laptop at all times. The wiring harnesses
>> are only $10/each, so I leave those attached to the boards I'm working
>> on - the WaveForms (free) software has the concept of projects which
>> contain the configurations of all the devices on the AD2 that you are
>> using for each setup, so switching boards takes literally a minute (or
>> less).
>>
>> I was using it on the flight from the UK back to the UAE last week - I
>> had my laptop out, a Texas Instruments MSP-EXP430FR5969 development
>> board and the Analog Discovery - 6 hours of uninterrupted development
>> time - USB-powered dev environments are wonderful. No problems from
>> other passengers or the crew - I told the steward in advance I was an EE
>> and that I'd be working on the 'plane - I also made sure to keep any
>> blinking LEDs concealed
>>
>> I also have the probe expansion board - just so cute!
>>
>> * Two-channel USB digital oscilloscope (1MΩ, ±25V, differential,
>> 14-bit, 100MS/s, 30MHz+ bandwidth - with the Analog Discovery BNC
>> Adapter Board
>> * Two-channel arbitrary function generator (±5V, 14-bit, 100MS/s,
>> 12MHz+ bandwidth - with the Analog Discovery BNC Adapter Board
>> * Stereo audio amplifier to drive external headphones or speakers
>> with replicated AWG signals
>> * 16-channel digital logic analyzer (3.3V CMOS and 1.8V or 5V
>> tolerant, 100MS/s)
>> * 16-channel pattern generator (3.3V CMOS, 100MS/s)
>> * 16-channel virtual digital I/O including buttons, switches, and
>> LEDs – perfect for logic training applications
>> * Two input/output digital trigger signals for linking multiple
>> instruments (3.3V CMOS)
>> * Single channel voltmeter (AC, DC, ±25V)
>> * Network analyzer – Bode, Nyquist, Nichols transfer diagrams of a
>> circuit. Range: 1Hz to 10MHz
>> * Spectrum Analyzer – power spectrum and spectral measurements (noise
>> floor, SFDR, SNR, THD, etc.)
>> * Digital Bus Analyzers (SPI, I²C, UART, Parallel)
>> * Two programmable power supplies (0…+5V , 0…-5V). The maximum
>> available output current and power depend on the Analog Discovery 2
>> powering choice:
>>
>> ...250mW max for each supply or 500mW total when powered through USB
>>
>> ...2.1W max for each supply when powered by an auxiliary supply. 700mA
>> maximum current for each supply.
>>
>> As of March 17th, they have also released a fully-fledged logic analyser
>> version, the Digital Discovery for $199 -
>> http://store.digilentinc.com/digital-discovery-portable-logi
>> c-analyzer-and-digital-pattern-generator/
>> .
>> This is an up to 800MHz multi-channel logic analyser & pattern generator
>> for peanuts.
>>
>>
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