Ty McKinney

<p>Hello,</p> <p>What instrument model number and accessories are you using? What settings do you have enabled for your test? What range are you using for measurements and what is your expected value(s)?</p>

Michel,<br> Can you provide a screenshot or picture of the 2450's screen showing these question marks on the info/manage screen?

Paul,<br> You will only be able to use either the front or rear terminals. You cannot use both front panel and rear panel terminals simultaneously.

Hello,<br> The recommended cables and accessories for the 2657A can be found on the datasheet for the unit found below. Also, the cables and accessories that the HV-CA-554 can be used with can be found on the HV-CA-554 manual also provided below.<br> <font face="Calibri, sans-serif"><span style="font-size:11pt;">We only recommend HV Triax for these voltages. We do have Triax-BNC adaptor that is rated for 1300V, but we do not recommend because most BNC cables and connectors are only rated to 300-500V. Since the 2657A goes beyond the capabilities of </span><span style="font-size:14.6667px;">most</span><span style="font-size:11pt;">&#160;BNC cables and connectors, I am unable to recommend using a TRX to BNC adaptor with this unit.</span></font><br> <br> <a href="https://www.tek.com/en/datasheet/2657a-high-power-system-sourcemeter-smu-instrument">2657A High Power System SourceMeter SMU Instrument | Tektronix</a><br> <a href="https://www.tek.com/en/manual/model-hv-ca-554-high-voltage-triaxial-cable-inform">Model HV-CA-554 High-Voltage Triaxial Cable Information | Tektronix</a>

Hello,<br> Please run the altered code below and let me know if this performs how you were expecting it to. <pre>import pyvisa as visa rm = visa.ResourceManager('@py') #print(rm.list_resources()) address1 = &quot;TCPIP0::192.168.0.45::inst0::INSTR&quot; dmm = rm.open_resource(address1) dmm.write('*RST') dmm.write(':TRACe:MAKE &quot;voltDigBuffer&quot;, 10000') dmm.write(':DIG:FUNC &quot;VOLTage&quot;') dmm.write(':SENS:DIG:COUN 100') dmm.write(':INIT') print(dmm.query(':TRAC:DATA? 95, 100, &quot;voltDigBuffer&quot;')) dmm.close() rm.close()</pre>

Hello,<br> Can you give some more detail for your question &quot;How can I query data from buffer like .xls file?&quot;? Thanks in advance!

Hello Justin.<br> In step 3, the procedure has you configure in 2-wire mode, not 4-wire. Is there a procedure you are using in your version of the manual that includes a 4-wire mode adjustment for the high(100 MOhm) range?<br> Here is the version I am using:<br> <a href="https://www.tek.com/en/tektronix-and-keithley-digital-multimeter/2110-series-5%C2%BD-digit-dual-display-usb-multimeter-manu">Model 2110 5 1/2 Digit Digital Multimeter Calibration Manual | Tektronix</a>

Hello,<br> What I would recommend for having a greater time interval between your measurements is to take a look at output delay in the manual below, as well as source delay.<br> Output delay I would read through how that function works and see if you want to utilize this function.<br> For source delay, I would recommend setting this to the max interval (99 s.) so there is a larger time difference between each of your measurements, meaning it will take longer between measurements and increase the time of your test.<br> <br> A different way you could achieve the 15-minute window between measurements, or a time frame around that mark, is to utilize external triggering.<br> <br> See page 3.5 AND ON for all of this information for the SDM (Source Delay Measure) process.<br> <a href="https://www.tek.com/en/tektronix-and-keithley-dc-power-supplies/keithley-2280s-series-manual/series-2280-precision">Series 2280 Precision Measurement DC Power Supplies Reference Manual | Tektronix</a>

Hello Gerhard,<br> You will not be able to get the 2450 to operate in a constant power mode as your resistance changes over time.<br> The closest that you could achieve with this instrument is to set a source value and compliance value and have those variables remain fixed throughout your test, as Power (P) is equal to your current (I) multiplied by voltage (V) P=I*V, this would imply a constant I and constant V. If you expect your resistance to change this would violate Ohm's Law, V=I*R.<br> If your resistance is expected to change, your I or V would need to adjust accordingly throughout your test. With the 2450 you can choose to set one of these functions as the constant source function, and the other would adjust according to your resistance, then you could measure your resistance.

The screen shot function on the touch screen SMUs are a front panel operation only. The closest you can get to something along this line would be to save all of your data, export it, and graph it manually. Also, you can screenshot the screen manually by pressing and holding the HOME and ENTER buttons on front panel.