AVR-Chat

techy fellow wrote:

> Hi,
>  
> As I'm new to electronics, I do not know how to test a logic analyzer. I bought a used 'Meguro' logic analyzer and it does not comes with user guide and the neccessary cables. I think the cable is just normal cable (eg. Hard-disk flat cable) and a test pin attached at the end of it.
>  
> The unit performed the self-test successfully upon powered up but, someone told me that does not mean the logic analyzer is working. If anyone can teach me how to test it, that will be great.
>  
> My logic analyzer (model: MLA-3300) has the following connectors/ switches behind the box.
> - Check (looks like a headphone socket)
> - VAR Adj Threshhold (looks like a POT)
> - VAR <-> TTL (switch)
> - DC Input (socket). Not sure why it is there since it allows AC input.
> - AC socket
>  
> On its side, there is a 20 Pins male connector. I've made a cable using those hard-disk colored flat cable. On one end, I attached the cable to a 20 pins (female) connector and at the other end, I soldered test clips (different colored; spring type) to each strand of the cable.
> 
> Thanks in advance for the help.
>  
> cheers,
> Davis

Should see if you can track down a manual,
but may find the manual isn't that helpful.

Any idea on the specs ?

To start with
You need a voltage source( 0-5volts should do) and some links.

Depends on the analyser settings.
If possible set to 5v or 10 v range.
Seen some having input voltage settings, others without.

Attach a wire to the voltage source (set to 2v)
with logic analyser on touch the wire to each input
and check the display shows the input you have connected 5v
to going high.

Do this to all the inputs.

Next you need a signal generator for.
Set it to square or sine wave.

Basically same again except start the sig gen
at a low frequency and check every input
then increase the frequency and go again.

Just change the logic analyser settings to match the
frequency.

Could try 1Hz, 1KHz, 100KHz, 1MHz, 10MHz, 20MHz
up to the max input frequency.

If you don't know the specs you can use this way to
work max input frequency out.

Someone else has probably got a easier/better way
but this should work.

Alex