Author Topic: Keithley 2000  (Read 15967 times)

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Offline EMUD

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Re: Keithley 2000
« Reply #25 on: March 20, 2015, 08:00:37 am »
Hi,
a view over all the values seemed to give the following information:

1. R271 (TF-245) is a thin film coustom resistor network with 0.1% or better tolerance.
2. The values given in the reversed schematic are meeting the measured TF-245 s.
3. For some resistors (i.e. the 1K,9K and 90K) the pecise value is not the problem,but the ratio.
4. For some resistors the value has to be precise, i.e. the charging Rs for the integrator.

OK,
now it should be no problem to check the own TF-245.

Thanks

EMUD
« Last Edit: March 20, 2015, 09:50:50 am by EMUD »
 

Offline EMUD

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Re: Keithley 2000
« Reply #26 on: April 02, 2015, 07:47:57 am »
Hello,
the new TF-245 has arrived. Since I have got 4 arrays I have checked the values.

R1          R2          R3           R4          R5           R6         R7         R8          R9         R10        R11

0.9999K  8.9999K 10.0001K 20.000K  14.9995K 30.173K 29.708K 30.178K 27.421K 1.0003K 9.0040K

1.0002K  8.9989K   9.9985K 20.000K  15.0035K 30.168K 29.697K 30.166K 27.415K 1.0000K 8,9990K

1.0002K  8.9999K   9.9995K 19.996K  14.9973K 30.173K 29.700K 30.176K 27.416K 1.0001K 8.9993K

0.9997K  8.9960K 10.0030K 19.990K  15.0012K 30.176K 29.704K 30.174K 27.417K 1.0006K 9.0007K


R12

90.001K

89.979K

89.982K

89.990K

I have replaced my faulty TF-245 and all the problems are gone.

But I have discovered a strange behaviour with the self test:

Software A02

When selecting ACV or FREQ and starting selftest, all tests failed! Starting self test after starting the unit there is no problem with the selftest !!

Has anyone seen this, too ?

Best regards and a nice easter weekend

EMUD
 

Online EEVblog

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Re: Keithley 2000
« Reply #27 on: April 03, 2015, 01:23:50 pm »
Test
 

Offline miguelvp

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Re: Keithley 2000
« Reply #28 on: April 05, 2015, 03:08:47 am »
somewhere in page two of this thread something went really wrong, I just get a blank page and the only way to read it is by pressing reply and read the messages bellow

 

Offline picburner

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Re: Keithley 2000
« Reply #29 on: April 23, 2015, 04:29:17 pm »
To the Administrator:
can you repair the page 2 of this thread?
It has become invisible, thanks.
 


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