[time-nuts] Re: HP 5061: Unable to adjust beam current to less than 46nA

[Andy Talbot]

I found it amusing  in the 5061 manual that they suggest using
the 10Meg input resistance of a Valve Voltmeter as a current shunt to
measure beam current

Andy
www.g4jnt.com



On Wed, 7 Jun 2023 at 19:16, Corby Dawson via time-nuts <
time-nuts at lists.febo.com> wrote:

> Matt,
>
> You can select a resistor to drop the EM volts down some more.
>
> This would allow you to drop the beam current.
>
> However the instrument will work just fine at your values.
>
> As long as you can adjust the loop gain on the A7 to get 40 on the 2nd
> harmonic I'd just leave it as is.
>
> I have a 5061B that has an excellent tube. The minimum E.M. is 1200V and
> my beam current is around 48 (mod on). I just use it that way as it's a
> hassle to tear into just to change the beam current indication.
>
> Cheers,
>
> Corby
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