It appears that the 9010A can be used for measuring frequency up to about 4 mhz. No tidy, more a compare function using the probe. Look in the docs with theFrederick's f9010.zip in the archive. This would be useful with test routines where you are looking for just a few specific frequencies, for example, on Pacman, the interrupt needs to be at a set frequency-this you could check. Or on Bally/Stern MPUs the 555 timer has a set frequency that should be checked every repair...

Here is the description:
------------------------------------<begin>--------------------------------
Frequency counter using the probe

There is a FREQUENCY command that enables a frequency counter on the probe -- up to around 4 MHZ, any way.  The compiler will insert assembly language code into your compiled code and when frequency requesting is done, the compiler will execute that code.  The way the frequency counter is used would look something like this:
:equate frequency as :next
 execute frequency

The result of the frequency measurement will be placed into either REG0.or REGF depending upon which version of this compiler you have.  It�s up to you to determine whether the frequency count goes into REG0 or REGF for your version of the compiler, I�m sorry to say.  The example code provided here assumes that REG0 is the register which receives the value.  You can simply do a test by displaying both REG0 and REGF, doing the FREQUENCY command, and then displaying REG0 and REGF again to see which one changed.  After you know which register is used, make a note.

After you have equated �frequency� to a program number, to use the frequency counter, then, you could do something like this:
 execute frequency
 if REG0 > 1860000 goto 1
 display CLOCK LOOKS BAD
 goto 2
label 1
 display FREQUNCY LOOKS GOOD
label 2
----------------------------------------------------------------------------------------------------------<30>--------------------------------------------------

I wonder if this will work with the rksic.exe compiler? I like using that compiler as it is all in one system, and I find it cumbersome to run several compilers in DOS windows...but the documentation provided with Frederick Rice's f9010.zip is superior to anything I had found before.

                                                  -->> The Fluke archive is @ http://www3.telus.net/Flippers/Fluke <<--

John :-#)#

At 08:06 AM 22/01/2002 -0500, Kev wrote:

What model is yours & what are the differences between the various HP
models?

Thanks,
Kev


> I picked up a HP Signature Voltmeter from eBay for a good price a year or
> so ago, has a nice counter built in...I have some spare parts, thanks to
Al
> K. who sent me a dead one.
>
> John :-#)#


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