Hello,
I got recently a (very) used HP-5341A frequency counter and it seems to have
a problem with the high impedence input (which counts something even when
shortcircuited or terminated to a dummy load), the other input appeat to be
working good and also the internal 1 GHz source is beeing counted correctly.
Does anyone have the user manual and/or (would be great) the service manual
of this unit? Refunding the expense of course.

Thanks in advance

Francesco IS0FKQ