Re: Simpson 260 repair

On Fri, 4 Apr 2025 11:36:40 -0400, bitrex <user@example.net> wrote:

Picked up a Simpson 260 6M at the local thrift store, I was initially
disappointed to find it had a sticking meter but some gentle rocking
freed it.
>
Unfortunately the movement resistance is a little high, about 1880 ohms
vs the 1800 in the service manual. This causes the movement to not fully
deflect when 50 uA (sourced from an HP 6177B, and monitored by a
recently lab-calibrated 3478A) is run through it, it goes to more like
48.5 out of 50.
>
Is it correct that recharging the meter movement is the only thing that
can help in this situation? It seems a relative error of 3% is actually
still barely within factory spec so probably best to just let it go and
enjoy a meter that's nice enough for the 10 bucks I paid for it, lol

Tape a slide rule to the side to apply cal factors.

,lol