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Search found 224 matches

by Norbert W
April 18th, 2017, 5:34 am
Forum: Low Current Measurements
Topic: Measurement of the input current noise of an OPAMP
Replies: 2
Views: 11927

Re: Measurement of the input current noise of an OPAMP

Hello,
my assumption is that the op-amp with a feedback resistor (or network) in inverting mode is used to
inherently convert the current noise to be available as voltage noise on the amplifier output. You may
want to contact the op-amp vendor for details of his recommended method.
by Norbert W
April 18th, 2017, 4:37 am
Forum: Series 2000 and Series 2100 DMM's
Topic: Keithley 2002 Offset on Cold Start?
Replies: 2
Views: 10657

Re: Keithley 2002 Offset on Cold Start?

Hello, the serial number of your unit points back to 1994. If your unit works fine but has not been adjusted since then (or at least quite a while / recommended cal interval is one year) a calibration / adjustment might be recommended. The short test you did is hard to be commented not knowing the s...
by Norbert W
April 18th, 2017, 2:56 am
Forum: Other Keithley Instrument Products
Topic: K617 NPLC
Replies: 1
Views: 8992

Re: K617 NPLC

Hello,

the aperture time of a 617's A/D converter is fixed at 100 ms (= NPLC 5 in Europe) - it cannot be adjusted.

All current electrometers (6517B, 6514) and - (6485, 6487) allow NPLC adjustment.
by Norbert W
July 13th, 2016, 11:54 pm
Forum: Electrometers
Topic: K. 6517A+6521 scanner card+Agilent VEE PRO v8.x
Replies: 3
Views: 17911

Re: K. 6517A+6521 scanner card+Agilent VEE PRO v8.x

Hello, if you asked for a 'from scratch' solution I would let your software do the timing and use a loop to close a channel and get a reading. For a scan I still would let the timing control for when a scan is started (:INIT) on the PC side. This implies to send a one-time setup first, use of a dela...
by Norbert W
July 13th, 2016, 11:31 pm
Forum: Keithley 3390
Topic: Master/Slave 3390
Replies: 2
Views: 13723

Re: Master/Slave 3390

Hello, here comes a recipe which could come close to what you want: 1.) set your master 3390 to the desired output 2.) set your slave 3390 to the desired output pulse width but somewhat higher frequency (to be faster than the master for triggering purposes) 3.) connect Sync output on your master 339...
by Norbert W
July 12th, 2016, 4:34 am
Forum: DMM7510 Graphical Sampling DMM
Topic: 7510 digitizer
Replies: 1
Views: 9094

Re: 7510 digitizer

Hello, here a excerpt from the reference manual regarding the dmm.digitize.range command: When you assign a range value, the instrument selects a fixed range that is large enough to measure the assigned value. The instrument selects the best range for measuring the maximum expected value. For exampl...
by Norbert W
July 11th, 2016, 1:45 am
Forum: 2450/2460 Touchscreen SourceMeter
Topic: LABView Keithley 2460 pulse mode
Replies: 11
Views: 32552

Re: LABView Keithley 2460 pulse mode

Hello, looking at the relevant part of your code: TRIG:BLOC:SOUR:STAT 1, ON TRIG:BLOC:DEL:CONS 2, 5e-5 TRIG:BLOC:SOUR:STAT 3, OFF TRIG:BLOC:DEL:CONS 4, 5e-5 TRIG:BLOC:BRAN:COUN 5, 30, 1 there are to delay blocks of 50 usec each - but this is additional time to the processing time of the other blocks...
by Norbert W
July 11th, 2016, 1:30 am
Forum: 2600 Series SourceMeter
Topic: Keithley 2636B error 1101
Replies: 1
Views: 8934

Re: Keithley 2636B error 1101

Hello, as the error message 1101 means 'Parameter too big' and another installation working I would assume that a Windows setting is causing your issue. Have a look at the regional settings and have a look for decimal separator - should be , (comma) by default in Germany and change to . (period / fu...
by Norbert W
July 11th, 2016, 1:09 am
Forum: Series 2000 and Series 2100 DMM's
Topic: trigger delay
Replies: 2
Views: 11850

Re: trigger delay

Hello, I would like to add several comments to your description: 1.) 'measure voltages and resistances' -> for fast operation please avoid function changes where possible, i.e. voltage ch 1, resistance ch 2, voltage ch 3, resistance ch 4 would be better arranged as voltage ch 1, voltage ch 3, resist...
by Norbert W
July 4th, 2016, 4:51 am
Forum: Series 2700 Multimeter/Data Aquisition/Switch System
Topic: 2700 .NET driver error
Replies: 1
Views: 9183

Re: 2700 .NET driver error

Hello,
please try debugging in your programming environment; an Internet search for "vshost32.exe has stopped working"
shows many hits and debugging first might narrow down problems and solutions.
by Norbert W
June 1st, 2016, 5:22 am
Forum: 2600 Series SourceMeter
Topic: Problem with two channel operation
Replies: 1
Views: 8696

Re: Problem with two channel operation

Hello,
If you can supply your code in a LabView 2012 version I will have a look at it.
by Norbert W
January 4th, 2016, 1:41 am
Forum: 2600 Series SourceMeter
Topic: TSB tsp file integration into programming environment
Replies: 3
Views: 13461

Re: TSB tsp file integration into programming environment

Hello, with TestScriptBuilder you can manually save console data. To get this automated you can use different environments, e.g. LabView. When doing so please keep in mind that TSB takes the burden of adding loadscript endscript from the user. I.e. when copying your script into e.g a VISA write you ...
by Norbert W
December 22nd, 2015, 12:40 am
Forum: Electrometers
Topic: Two 6517 in series?
Replies: 1
Views: 11426

Re: Two 6517 in series?

Hello, it is generally not recommended to put two electrometer ammeters in series, so if possible measurements should be done one after the other (only one unit connected to the current source at a time) and compare measurement data afterwards. (Technically the HI and LO connections of an electromet...
by Norbert W
December 22nd, 2015, 12:25 am
Forum: Series 3700 Switch System/Multimeter and Plug-In Cards
Topic: 3721- realys resistance and min current
Replies: 3
Views: 14374

Re: 3721- realys resistance and min current

Hello, these relays are considered in a broader view in the Series 3700A (mainframe) specifications. You will find range dependent information for shunt resistors and burden voltage - and (hopefully to your delight) Burden Voltage with 3721 card . Here some values: 3A: <2.35V 1A: <1.15V 100 mA: <0.4...
by Norbert W
December 21st, 2015, 1:58 am
Forum: Series 3700 Switch System/Multimeter and Plug-In Cards
Topic: 3721- realys resistance and min current
Replies: 3
Views: 14374

Re: 3721- realys resistance and min current

Hello,

let me quote the 3721 datasheet:

Channel resistance (end of contact life):
- Dual 1x20: <1 Ohm
- Single 1x 40 : <1.5 Ohm
(please check for footnotes regarding 3721-ST and backplane relays)

Minimum signal level:
10 mV, 10 microA
by Norbert W
December 17th, 2015, 12:39 am
Forum: Series 3700 Switch System/Multimeter and Plug-In Cards
Topic: 3721 multiplexer
Replies: 1
Views: 9375

Re: 3721 multiplexer

Hello,

yes, you have full access to individual 'channel' relays and backplane relays.
by Norbert W
December 10th, 2015, 1:49 am
Forum: Series 3700 Switch System/Multimeter and Plug-In Cards
Topic: 3706 with 3721 multiplexer
Replies: 3
Views: 14193

Re: 3706 with 3721 multiplexer

Hello, yes you can use the output of the bank you use for current measurements - or equivalent the current channel input where you connect it to. If you want to skip the relay contacts further you could consider contacting the D-sub analog input connector on the rear side of the instrument (Amps and...
by Norbert W
December 9th, 2015, 12:56 am
Forum: Series 3700 Switch System/Multimeter and Plug-In Cards
Topic: 3706 with 3721 multiplexer
Replies: 3
Views: 14193

Re: 3706 with 3721 multiplexer

Hello, (please have a 3721 simplified schematic 'two pole mode' from the datasheet at hand when referring to the below comments) the multiplexer card 3721 has two current channels (41, 42); you can expand that in multiple ways - depending on your application needs: 1.) If the currents must not be in...
by Norbert W
December 3rd, 2015, 3:02 am
Forum: 2600 Series SourceMeter
Topic: High Current After Turning On (2612A)
Replies: 3
Views: 12787

Re: High Current After Turning On (2612A)

Hello,

yes, please contact our service - this unit is broken.

(P.S. Please make sure that your failure description is sent with the unit.)
by Norbert W
December 2nd, 2015, 7:56 am
Forum: 2600 Series SourceMeter
Topic: High Current After Turning On (2612A)
Replies: 3
Views: 12787

Re: High Current After Turning On (2612A)

Hello, if your 2612A smub shows an approx. 0.4 A with open inputs I would not doubt it needs repair. As the other effect when shorting the unit and taking off the short again is irritating please make sure you have a symptom which can be reproduced by an instruction you provide to colleagues in serv...

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