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Search found 14 matches

by Mark W
June 13th, 2013, 8:28 am
Forum: Other Keithley Instrument Products
Topic: RTS input on Keithley 6221 ignored
Replies: 4
Views: 18643

Re: RTS input on Keithley 6221 ignored

For HW flow control, RTS pin on one end of the cable needs to be connected to CTS on the other end of the cable. When RTS stays asserted at the receiver it means:keep sending data to me. If RTS is negated it means: stop sending me data. When the receiver is ready for more input, it asserts RTS reque...
by Mark W
October 23rd, 2012, 1:13 pm
Forum: 2400 Series SourceMeter
Topic: 2420 for cyclic voltammetry
Replies: 3
Views: 13573

Re: 2420 for cyclic voltammetry

Unfortunately, no it is not possible.

Mark
by Mark W
October 17th, 2012, 9:50 am
Forum: 2400 Series SourceMeter
Topic: 2420 for cyclic voltammetry
Replies: 3
Views: 13573

Re: 2420 for cyclic voltammetry

I believe it can be done, but not with one 2420. You can create a custom sweep from 0-2V and then 2-0V for your working electrode and you will need another SMU for sensing the counter electrode. 4 wire sensing should not be required. Look into our 26xx series SMU's, as they are two channel per unit....
by Mark W
October 16th, 2012, 6:12 am
Forum: 2400 Series SourceMeter
Topic: 2400 range problem
Replies: 3
Views: 12979

Re: 2400 range problem

To excede the DC source measure parameters would require pulsing or combining multiple SMU's. The 2400 SMU does not have pulsing capabilities. So your only options are to combine SMU channels or to use a diferent SMU(2430). I have attached a pdf that explains this in detail. HighCurrAppNote[1].pdf M...
by Mark W
September 19th, 2012, 6:24 am
Forum: Series 2000 and Series 2100 DMM's
Topic: 2010 4 wire resistance measurements
Replies: 1
Views: 8749

Re: 2010 4 wire resistance measurements

This sounds like a thermal EMF issue, which is caused by dissimilar metal junctions (DUT - Test leads). To verify, you could heat or cool the individual junctions and see if your measurement drift changes direction. What you have in effect is a thermocouple. This can be minimized by using high quali...
by Mark W
September 18th, 2012, 6:12 am
Forum: 4200-SCS Semiconductor Parameter Analyzer
Topic: Help in resistivity measurement in van der Pauw 4200 SCS
Replies: 1
Views: 8998

Re: Help in resistivity measurement in van der Pauw 4200 SCS

Yes you can do Van Der Pauw measurements with only two SMU's, But you will have to manually change your hookups for the different configurations. Just follow the Hookup diagram as shown in Fig 4 of the document below, and setup your own ITM for each configuration. You need four SMU's to perform the ...
by Mark W
July 13th, 2012, 11:40 am
Forum: Low Current Measurements
Topic: Measuring low current in a low resistance coil using a 6514
Replies: 5
Views: 19532

Re: Measuring low current in a low resistance coil using a 6

Can you post more details so we can help you. Signal levels? how are you connecting to the DUT?

Mark
by Mark W
July 13th, 2012, 6:54 am
Forum: Nanovoltmeters
Topic: 2182A data acquisition with labview
Replies: 5
Views: 22199

Re: 2182A data acquisition with labview

Jade, Sorry it took soo long to get back to you. I am unable to code a workaround for this firmware issue. The internal registers(6221) are getting corrupted when I try to send data via rs232 from the 2182A to the 6221. The measurement data is getting put into the error buffer, so you will not get r...
by Mark W
July 11th, 2012, 8:49 am
Forum: PicoAmmeters
Topic: 6485 Firmware
Replies: 1
Views: 8703

Re: 6485 Firmware

The latest firmware for the 6485 is B04, C01 firmware does not exist. The latest I/O layer SW driver is C04 and should work with B04 firmware. Please review the release notes for the I/O layer SW here: http://www.keithley.com/support/data?asset=52767 When the IVI driver for your measurement instrume...
by Mark W
July 11th, 2012, 8:07 am
Forum: 2400 Series SourceMeter
Topic: Doing a hysteresis sweep with 2400
Replies: 2
Views: 10985

Re: Doing a hysteresis sweep with 2400

Yes, this can be done using the "custom" sweep feature. You can program the number of measurements in the sweep and source level of each point.
Please refernce the 2400 users manual for more information.

Mark - Applications
by Mark W
July 11th, 2012, 7:56 am
Forum: Resistivity Measurements
Topic: Low Resistane Measuring
Replies: 1
Views: 9557

Re: Low Resistane Measuring

They can use the 7002 and 7011 as well as the 480. There should be no need to replace the -. I have attached a diagram to illustrate the connections.

Mark - Applications
by Mark W
July 11th, 2012, 6:29 am
Forum: Resistivity Measurements
Topic: Volume resistivity measurement - ASTM D991
Replies: 1
Views: 10411

Re: Volume resistivity measurement - ASTM D991

Yes, the Keithley 6517B electrometer can be used for Volume resistivity measurement.

here you can find the data sheet:

http://www.keithley.com/support/data?asset=51992

here is an apps note:

http://www.keithley.com/support/data?asset=6069

Mark
by Mark W
July 10th, 2012, 5:37 am
Forum: Nanovoltmeters
Topic: 2182A data acquisition with labview
Replies: 5
Views: 22199

Re: 2182A data acquisition with labview

Yes, I was able to reproduce your problem, and it appears you have discovered a firmware bug that needs to get updated. As a work around for now, you can always send an ENTer command after every remote rs232 query. This will clear the error que and allow the data buffers to be synchronized.

Mark
by Mark W
July 9th, 2012, 11:23 am
Forum: Nanovoltmeters
Topic: 2182A data acquisition with labview
Replies: 5
Views: 22199

Re: 2182A data acquisition with labview

Jade,

Can you please provide all of the code you are using so I can see what you are doing?

Mark - Applications

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