Check to see if the button for internal/external counter is set correctly.

Rick wrote:

Anyone know of a troubleshooting guide for the HP 8640B?
My display reads all zero's although the generator is putting out a signal
just fine. I'd like to find a step by step guide that would lead me to the
defective component.

Rick K2XT





--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money" ;-P