• RE: question about Keithley 6430 connect to 6517B

    If you want to connect the two meters together without soldering a cable, need three items:<br> triax cable to 6430 preamp (7078-TRX-3)<br> Insert 237-BNC-TRX into end of 7078-TRX-3 cable<br> Put 7078-TRX-BNC triax to BNC adapter onto 6517B;&#160; attach the cable.<br> <br> If you want to make your own, see attached image.
  • RE: Switching between Resistance Reading Channels on DAQ6510

    How long are your cables from the 7707 and the devices?<br> <br> Also, for the high ohm channel, can you instead use 2W ohms mode?<br> I suspect part of the settling time issue will be for charging up the remote sense lines.<br> For 10M-Ohm and higher DUT value, the use of 4W is of negligible benefit and in this case might be giving you a longer settling time problem.
  • RE: Error 5111 on Keithley 2461

    For topic #2, check the state of your interlock.&#160; I suspect that is not engaged and it is normal for the instrument to clamp the output below ~42V.&#160; In your case, you are hitting the voltage clamp level and so the current forcing is not the primary action of the SMU any longer;&#160; the actual current will be the clamped V / DUT R.<br> <br> For topic #1, error 5111 is because the measure time will exceed the requested pulse width.<br> Try setting the NPLC to minimum of 0.01 which for 60Hz power equates to 166.7usec.<br> Make sure you turn off the source readback;&#160; that defaults to ON which means two measurements occur (one for V and one for I) which at 0.01 NPLC puts you past the 250usec pulse width.&#160; Turn it off so that if forcing I, it only measures V and does not also read back the source level.<br> Source or Measure Delays could also be playing a role;&#160; set them to zero.<br> <br> Last:&#160; make sure your firmware level is up to date.&#160; 1.7.12b is current release.
  • RE: 2600-PCT Curve tracer remediation and probe station integration?

    Hi Daniel,<br> <br> Interesting combination of products you have.&#160; Too bad the gate SMU is 2601B and not 2611B.<br> I'm conferring with factory about the 40V models and if the ~200V OVP is sufficient.<br> <br> <br> For the handling of the LO and Sense LO from the 2657A and the 2601B, we do have a &quot;ground unit&quot; accessory item:&#160; 2657A-LIM-3.<br> A single triax cable from the SLO/LO connector on each SMU is brought to the LIM-3.<br> The LIM-3 then provides output connectors for the combined LO and separately for the combined SLO.<br> the LIM-3 also provides interlock hub.<br> <br> <a href="https://www.tek.com/en/default-accessory-series-manual-29">Info on the 2657A-LIM-3</a><br> <br> Let me come back to you concerning the 40V model.<br> <br> Do you have any of the 2600-TRIAX accessory items to convert the 8-pin Phoenix connector to three triax for the gate SMU?<br> &#160;
  • RE: Entry Point Error in GPIB diagnoistic

    When you run into the trouble, find the gpib related DLL and right click to see properties; &#160;namely the author/publisher.<br> <br> You can have LabVIEW and other NI software (VISA) installed. &#160;Just don’t let the NI support for GPIB cards install, else it will overwrite the DLLs that need to be for your KPCI488-488A gpib interface card.<br> One strategy would be to install&#160;KPCI488-488A driver after other NI related software is installed.<br> &#160;
  • RE: DMM6500 streaming digitized data to computer via python + TSP code

    The appendix B code is configuring the instrument to use binary data format (format.data = format.REAL32).<br> Compared to ASCII, this allows fewer characters on the bus for better throughput.<br> <br> To interpret the data, checkout some IEEE754 compliant techniques.<br> I think numpy and fromfile might be useful.
  • RE: Keithley SMU 2450 Sample rate of one reading @ NPLC=0.01

    Model 2450 uses integrating A/D converter type.<br> It is custom implementation, but is reasonable to think of it as dual slope integrating A/D of about 22 bits at 1 NPLC.<br> The NPLC setting is affecting the duration of the integration or how long you let your signal “charge up” the cap.<br> Regardless of NPLC value, a reported measurement is based on sample size of one.<br> <br> In contrast, some of our products have both high accuracy integrating A/D and fast digitizing A/D.<br> The digitizer always runs at 1MHz; &#160;requested sampling rates slower than 1MHz can make use of auto aperture based averaging from the 1MHz data. &#160;SMU models such as 2461, 2651A have digitizers in addition to integrator.
  • RE: Cycle life of hot vs cold switching

    That sort of performance info would be specified by the OEM of the relay that is mounted into the S46 chassis.

    Assuming Radiall relay types, their document here may be of help:
    Radiall RF Relay Info

    On pg 14 of that document they give their recommendation about hot switching (don't).
    The estimated amount of degradation in the relay life/number of operations is a function of the average power of the signal.

    On pg. 9 of that document they give the Average Power Rating vs. Operating Frequency.
  • RE: Entry Point Error in GPIB diagnoistic

    Check your gpib-32.dll properties.  Is it from NI or Keithley or possibly CEC?

    My guess is that something installed the NI driver for GPIB.  And it over-wrote the required version of that DLL needed by the KPCI-488A card.
    Can you reinstall the driver for KPCI-488A?
  • RE: DAQ6510 Display when using rear terminals under GPIB control

    Did you close the channel?
    For the reading that is placed in the buffer, what channel tag does it have?

    My .NET code from prior post does cause the front panel to update the watch channel measured value.

    On the instrument, in the event log settings, you can enable command logging.  This will let you see exactly what the IVI driver commands are sending to the DAQ.

    If still not working, check your firmware level.  I'm at 1.7.12b