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The recent topic about the THS720/THS720A encourages me to submit an issue that I've had with my THS720A for some time.
The instrument is in pristine condition, both cosmetically and technically. Unfortunately, some time ago I could not resist the temptation to "upgrade" it to a THS730A by moving a few resistors, as described somewhere on the 'net.
Basically, it sort-of worked (both bandwidth and samples/sec) but it slowly filled the error log so I restored it to its original state as a THS720A.
Since then, it has been fine except for the old entries in the error log, which I haven't been able to clear. It's ugly but not a real problem of course.

I'm wondering if the error log can be cleared independently, i.e. without calibrating first (it doesn't need any adjustments) and if so, how, and if not, is calibration of the 'scope-part i.e. leaving the DVM as-is possible and sufficient? I don't have any of the special DC voltage generators needed and I'm not looking forward to set the voltages ad hoc on a normal voltage source.

Thanks in advance for any info!

Raymond

On Sun, Oct 21, 2018 at 01:18 AM, Raymond Domp Frank wrote:

I'm wondering if the error log can be cleared independently

If you connect a PC running a terminal program to the serial port of the THS
you can try sending first PASSWORD PITBULL and then ERRLOG CLEAR.
It doesn't clear any RS232 errors but it resets the numbers of power up and
most likely power on errors (mine has no errors so I can't say for sure).
/H?kan

On Sun, Oct 21, 2018 at 10:29 PM, zenith5106 wrote:

If you connect a PC running a terminal program to the serial port of the THS
you can try sending first PASSWORD PITBULL and then ERRLOG CLEAR.

Thanks a lot, H?kan.
Will try that during the coming week and share result.

Raymond

If you connect a PC running a terminal program to the serial port
of the THS you can try sending first PASSWORD PITBULL and then ERRLOG CLEAR.

H?kan gave me above advice. It turns out to achieve what I wanted: The error log is cleared.

Raymond

So... What of the THS 730a upgrade ?
What exactly were the problems with that ?
& how can each issue, in detail, be solved ?

I have a THS720a and would like to upgrade it to the THS 730a.

thanks,
rick

On Thu, Nov 22, 2018 at 05:40 PM, garp66 wrote:

Rick,
Please see below.

So... What of the THS 730a upgrade ?

Have a look here:

I think I got all my info there.

What exactly were the problems with that ?

It worked but the bandwidth didn't reach 200 MHz, probably because the THS730A uses different attenuators.
Also, ISTR that 1 GSa/s worked but the display quality wasn't 100%. I have to admit I don't quite remember.
And lots of error messages turned up in the Error Log.

& how can each issue, in detail, be solved ?

If I knew, I wouldn't have returned back to the 720A... setup.

I have a THS720a and would like to upgrade it to the THS 730a.

Raymond

On Thu, Nov 22, 2018 at 07:06 PM, Raymond Domp Frank wrote:

Also, ISTR that 1 GSa/s worked but the display quality wasn't 100%. I have to
admit I don't quite remember.
And lots of error messages turned up in the Error Log.

I should add that I didn't spend much time on it before deciding to revert so your results may be better.
ISTR also that the time base setting allowed for a faster sweep than the 720A's. The faster sampling rate and the faster time base were what I was interested in. Still, I decided to revert, maybe just because of the error log growing all the time, don't remember.
The link in my previous message gives access to all the info I had available.

Raymond