keithley 2100

[ace73]

Hi to all
anyone who needs help on fixing keithley 2100 multimeter
please drop me an email

 

[(*steve*)]

No.

If you have some useful hints, post them here. It's a much better solution that someone finding your post in a couple of years and finding your email address no longer works.

 

[ace73]

ok can you teach me how to post it ?
pdf or plain txt

 

[davelectronic]

Multi meter

Hi there. I am fairly new to forums, but even i can find may way around, if you have the skill to repair multi meters, a forum should be a breeze, hope you enjoy the forum as much as i do. Dave.

 

[ace73]

Ill try to put it in text first
there are 4 major blocks of the keithley multimeter

1 analog processing
2. dsp
3. usb interface
4. panel / controls

all this parts are supplied by linear regulators . 3.3 -18 +18 5v
the linear regulators are powered by linear transformer and a 4 diode bridged with a filter cap (stone 1000uf 16V)
there are 6 of this capacitors
the main problem that I saw in the multimeter is the large ripple cause by the power supply due to busted filter cap
2Vp-p ripple instead of less than 0.7vp-p
i replaced the cap powering the DSP , I change it to a more superior maker panasonic / rubycon .
the thing works. I repaired 15 pcs if this all have busted caps 1000uF -> 400uf to 80uf worst
keithley designers place poor quality capacitors

to all members please disseminate this information to help others
I know many are complaining about this cheapo multimeter
If anyone needs more instructions please reply or drop me an email

 

[MIBO]

Thanks

Hi,
Thanks for the tip, Keithley wanted to charge me £150 for fixing and calibrating the meter, I never expected anything so simple would be wrong with it.