[time-nuts] Re: HP5328B TI avg showing half value

[Bob Camp]

Hi

Be careful of the combination of DC coupling / 5V and an older HP counter input.
At least on the 5535, that was a really great way to spend big bucks getting the
counter repaired. You fried the input IC and their only fix was to replace the entire
front panel board.

Back on topic … not a lot of direct experience with the 5328 so no idea if this is
an expected result. My guess is there’s something wrong somewhere ( = it’s not
normal). However, that’s only a guess.

Bob

> On Apr 18, 2023, at 11:02 AM, Magnus Danielson <magnus at rubidium.se> wrote:
> 
> Hi,
> 
> So I fiddle around at 100-400 ns and readout turns out linearly at about half value.
> 
> The frequency is 100 kHz of the pulses, which can be tweaked, but for the moment fits is purpose.
> 
> Now, turns out that using manual setting of trigger-offset rather than auto removes the issue. I've not concluded exactly why, but it does. Will grabb the other 5328 to see if it does about the same.
> 
> Maybe I need to trim up the input side?
> 
> For reference, using TTL signal levels for this, terminate with 50 Ohm.
> 
> Cheers,
> Magnus
> 
> On 2023-04-18 16:36, Bob Camp wrote:
>> Hi
>> 
>> How big a delay are you looking at?
>> 
>> Bob
>> 
>>> On Apr 18, 2023, at 6:32 AM, Magnus Danielson via time-nuts <time-nuts at lists.febo.com> wrote:
>>> 
>>> Fellow time-nuts,
>>> 
>>> As I was testing a HP5328B in TI avg mode, it displays about half the value expected. I pulled out a SR620 to verify the proper time-delay.
>>> 
>>> I'll pick up my HP5328A with option 040 and check that one.
>>> 
>>> While I will dig into this, maybe someone remembers seeing this.
>>> 
>>> I'm not ruling out handling error or hardware error, but for the moment the signal seems OK at least.
>>> 
>>> Cheers,
>>> Magnus
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