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by brian.d.smith
October 31st, 2016, 9:29 am
Forum: Organic Device Measurements
Topic: Measure OFETs with 2614B and TSP Express
Replies: 5
Views: 24485

Re: Measure OFETs with 2614B and TSP Express

Yes please try IVY and see if it suits your need.

If IVY does not workas you require, I would suggest writing a python program. Python and PyVisa are free to download and use.
by brian.d.smith
October 29th, 2016, 3:08 am
Forum: Organic Device Measurements
Topic: Measure OFETs with 2614B and TSP Express
Replies: 5
Views: 24485

Re: Measure OFETs with 2614B and TSP Express

TSP express is not intended to be a full-featured platform for every measurement type. TSP Express is a free web page that can get you taking measurements immediately after power up the instrument for the first time. We sell a full-featured software package called ACS Basic that has the features you...
by brian.d.smith
October 29th, 2016, 2:54 am
Forum: 2657A High Voltage SourceMeter
Topic: SMU 2657A overheating?
Replies: 5
Views: 23113

Re: SMU 2657A overheating?

We need some more information. 1. How have you integrated the 2657A with your 4200? Did you write a UTM or are you using ACS Basic? Or some other method? 2. What is your ramp rate when sweeping from 0 to 3000V? 3. What current do you consider to be breakdown? 20mA at 3000V sounds like more reverse c...
by brian.d.smith
October 28th, 2016, 4:31 am
Forum: 2450/2460 Touchscreen SourceMeter
Topic: Bluescreen Fatal Error
Replies: 4
Views: 21066

Re: Bluescreen Fatal Error

The newest version of Kickstart software is 1.8.4.1 which was released July 2016. Please uninstall your old Kickstart and try the newest version.

Are you in SCPI mode or TSP mode when you are are running your trigger model?
by brian.d.smith
October 25th, 2016, 3:46 am
Forum: 2400 Series SourceMeter
Topic: Using K2400 with Python
Replies: 5
Views: 25302

Re: Using K2400 with Python

Thanks for your answers, it is working fine using VISA cmd. But i'm still interested in using the Ke24xx.dll If possible i still request a script example using the dll. BR What is your compelling reason to use a DLL written for Microsoft Visual Basic to interface to a free Python language? Industry...
by brian.d.smith
October 25th, 2016, 3:28 am
Forum: 2600 Series SourceMeter
Topic: Incorrect Current Being sourced through SMU
Replies: 1
Views: 10390

Re: Incorrect Current Being sourced through SMU

Change your NPLC to 1.0. You are throwing away 99% of the goodness of the integrating A/D converter with NPLC of 0.01.
by brian.d.smith
October 24th, 2016, 7:55 am
Forum: 4200-SCS Semiconductor Parameter Analyzer
Topic: Problems sourcing High Voltage on some SMUs
Replies: 3
Views: 16301

Re: Problems sourcing High Voltage on some SMUs

Have you disconnected all the cables from the rear of the 4200? This will isolate a 4200 problem from a cables/devices issue. For each individual SMU, source voltage and measure current.You should be able to run each SMU up to 200V and the measured current should be very low. If that works well, the...
by brian.d.smith
October 22nd, 2016, 8:58 am
Forum: Low Current Measurements
Topic: Shielding box for low-current measurements
Replies: 8
Views: 33826

Re: Shielding box for low-current measurements

Your coax cables will be the limiting factor. Coax will leak current as well as generate triboelectric charge. You can use your sourcemeter to characterize the cables. Leave the cables in open air and force voltage and measure current. Perform a voltage sweep and see what voltage dependency the leak...
by brian.d.smith
October 19th, 2016, 8:02 am
Forum: Low Current Measurements
Topic: Shielding box for low-current measurements
Replies: 8
Views: 33826

Re: Shielding box for low-current measurements

Not 3 boxes. Only 2 boxes. The outer box is more or less automatically connected to LO via the shield of the triax adapter mounted to the outer box. It is up to you whether you want the outer box connected to earth. The earth connection prevents the box from being at any voltage that will shock an o...
by brian.d.smith
October 19th, 2016, 4:53 am
Forum: Low Current Measurements
Topic: Shielding box for low-current measurements
Replies: 8
Views: 33826

Re: Shielding box for low-current measurements

There are 3 "signals" for FORCE; HI, GUARD and LO. There are 3 "signals" for SENSE; HI, GUARD and LO. HI and LO connect to your device inside the box. GUARD protects HI against cable leakage between the 2636B and your box. Usually the box is connected to the outer shield. Inside the box you can expe...
by brian.d.smith
October 17th, 2016, 2:19 pm
Forum: Other Source Measurement Units (SMU)
Topic: K236 Reading .2V at 0mA across LED
Replies: 1
Views: 11179

Re: K236 Reading .2V at 0mA across LED

What current range are you using to force 0A and measure voltage? When you force 0A and measure voltage, you should use the current range with the most resolution. So, for the model 236, you should use the 1nA range. Next, when you force 0A and measure voltage, the 236 is a very high impedance voltm...
by brian.d.smith
October 7th, 2016, 6:52 am
Forum: Low Current Measurements
Topic: Continuous High Resistance Measurement with Keithley 6517B
Replies: 6
Views: 27595

Re: Continuous High Resistance Measurement with Keithley 6517B

Please download and have a close look at the datasheet; particularly the OHMS section. If you want to measure from 1G to 100G, that is three separate ranges. If you measure 1G on the 200G range, you are throwing away most of the accuracy of the measurement.
by brian.d.smith
October 6th, 2016, 7:28 am
Forum: Low Current Measurements
Topic: Continuous High Resistance Measurement with Keithley 6517B
Replies: 6
Views: 27595

Re: Continuous High Resistance Measurement with Keithley 6517B

Are you trying to force 200nA and measure voltage or are you trying to force 120V and set a limit of 200nA?
by brian.d.smith
October 5th, 2016, 8:14 am
Forum: 2600 Series SourceMeter
Topic: High Current Pulse on 2612B
Replies: 8
Views: 31534

Re: High Current Pulse on 2612B

I will see if we can post one that has been written.

In the meantime have you tried TSP Express, the web page inside the sourcemeter? You can combine SMU channels and create pulses and take measurements without writing any code. It is a way to make a quick source/measure assessment.
by brian.d.smith
October 5th, 2016, 5:53 am
Forum: Low Current Measurements
Topic: Continuous High Resistance Measurement with Keithley 6517B
Replies: 6
Views: 27595

Re: Continuous High Resistance Measurement with Keithley 6517B

Can you take a stable and accurate measurement from the front panel? Are you sourcing voltage and measuring current or just using current measurement? What range(s) are you using and what values are being returned? The 6517B can appear erratic when the signal presented to the 6517B has noise decades...
by brian.d.smith
October 4th, 2016, 6:10 am
Forum: 2600 Series SourceMeter
Topic: High Current Pulse on 2612B
Replies: 8
Views: 31534

Re: High Current Pulse on 2612B

Please download the 2600B Reference Manual Rev. B Section 2, page 2-59 begins a discussion for combining SMU channel outputs and a discussion of maximum current in pulse mode. The two channels that are used in parallel are set differently. For the 2612B, you can obtain 4.5V at 18A pulsed. The datash...
by brian.d.smith
September 30th, 2016, 2:09 am
Forum: Electrometers
Topic: 6517B - Autoranging instability (can not decide which range to use)
Replies: 8
Views: 33419

Re: 6517B - Autoranging instability (can not decide which range to use)

If you have a problem with leakage from Hi to LO in the air, then you should enclose your device with a metal enclosure and charge this enclosure to GUARD potential. This will cause the leakage and discharges to travel from HI to GUARD in the air. If GUARD happens to be at high voltage, then a safet...
by brian.d.smith
September 28th, 2016, 4:24 am
Forum: Resistivity Measurements
Topic: 4PP using 2 keithley 2100 6.5 dig meter
Replies: 5
Views: 23839

Re: 4PP using 2 keithley 2100 6.5 dig meter

The Keithley 2450 is the is probably the best choice. It has low current capability and relatively high voltage capability.

What voltage do you require and what current do you expect to measure?
by brian.d.smith
September 27th, 2016, 10:18 am
Forum: Resistivity Measurements
Topic: Low Resistance Measurement accuracy
Replies: 3
Views: 18401

Re: Low Resistance Measurement accuracy

If what you are looking for is not in the datasheet or the Customer Specification, it does not exist. If you want anecdotal information, I have experience measuring below 1 micro ohm. I have two devices in my office/lab. One of these devices is an Ohm Labs model 100-0 which is about 4 nano-ohms. The...
by brian.d.smith
September 20th, 2016, 11:57 am
Forum: 2600 Series SourceMeter
Topic: 2612: GPIB and TSP-Link
Replies: 2
Views: 13704

Re: 2612: GPIB and TSP-Link

Page 6-50 of the 2600B Reference Manual has a drawing and explanation of using more than one 2600B instrument. The computer connects to the master which is Node 1. The TSP linked subordinate instruments are Node 2 ...Node N. You send commands to a particular instrument with a preceding node number a...

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