[Techtoolslist] Alpha Electronics Dynamic Integrated Digital ICTester on eBay

[Fabrizio Vasile]

Hi Andrew.
Yes, I have an HP 10529A as well as a BK Precison 550 (TTL9 and a 552 (CMOS) 
but as, I said, I don't find them 100% reliable.
I'm thinking about a B&K Precision 560 like this:
http://www.electronicrepairegypt.com/bk-precision-model-560-progammable-ic-tester.html

Do you say that it behaviours more or less like a comparator?
----- Original Message ----- 
From: "Andrew Welburn" <andy at andysarcade.net>
To: "Technical Tools Mail List" <techtoolslist at flippers.com>
Sent: Wednesday, July 10, 2013 10:26 AM
Subject: Re: [Techtoolslist] Alpha Electronics Dynamic Integrated Digital 
ICTester on eBay



>

> On 09/07/2013 22:01, Fabrizio Vasile wrote:

>> OK, John, tomorrow I will do the scans (there are also schematics) ad I

>> will e-mail to you.

>> Regarding TTL in-circuit testing, since I repair  arcade PCBs for job ,

>> I'm looking for a good and reliable tester which can point me in right

>> direction at least (logic comparators are not very reliable IMHO).

>

>  You must be doing something wrong then, the HP 10529A is your best 

> friend. Don't think that a good in-circuit tester is going to tell you 

> anything different to a comparator. In fact, in-circuit IC testing is less 

> comprehensive than comparison, because a comparator actually takes account 

> of the circuit hook-up, where an in-circuit tester has problems with 

> tied/forced lines, conflicts and busses.

>

>  In-circuit testing cannot help you find faults that are to do with dry 

> joints/cut tracks/speed issues, good though they are.

>

>> Yes, obviously best thing would be to test TTL manually with the truth

>> tables and a logic probe, but , let's say, you have no schematics of the

>> PCB and dozens of other board that are waiting you..:)

>

>  Like everything, an in-circuit ic tester is another tool in your arsenal 

> against faulty pcbs, but there is no one tool that does the lot.

>

>

> Andrew Welburn

> http://www.andys-arcade.com

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