[time-nuts] 5370A

Joseph Gray jgray at zianet.com
Sat Oct 10 20:23:01 UTC 2009


Greg,

Yes, the trigger levels are near zero when the LEDs are flashing. The
level pots are both at 1 o'clock, instead of 12 o'clock, however.

There does seem to be a problem with the preset trigger postition.
Although the display shows 0.00V when at preset, I don't think it is.
When I manually set the levels to 0.00V, the TI shows 100nS. At preset
levels, the TI is noticeably higher.

Joe Gray
KA5ZEC

On Sat, Oct 10, 2009 at 2:08 PM, Greg Burnett <gbusg at comcast.net> wrote:
> Joe - When you manually set the trigger level pots to the center of the
> triggered range (as indicated by flashing trigger LED), does your digital
> display indicate trigger levels near zero volts? That is what's important -
> and what might be way off if you have DC bias problems in the front-end. If
> you have that problem, typically it will be in one channel only, although it
> could of course be in both.
>
> Greg
>
>
> ----- Original Message -----
> From: "Joseph Gray" <jgray at zianet.com>
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Sent: Saturday, October 10, 2009 12:42 PM
> Subject: Re: [time-nuts] 5370A
>
>
> Greg,
>
> I did your test and at the 12 o'clock position, both levels read
> -0.32V. Zero volts is at about 1 o'clock. With the attenuator switched
> in, the range on the pots is fairly sharp.
>
> Thanks for the tip. I'll add the  DC bias adjustment to my list.
>
> Joe Gray
> KA5ZEC
>
>
>
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