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by brian.d.smith
September 19th, 2016, 6:36 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)

In general, adding filters to any of our instruments will likely cause the instrument to oscillate. If the instrument could have been made more stable with a filter, we would have designed that filter into the instrument.
by brian.d.smith
September 16th, 2016, 9:05 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Warm Up Period
Replies: 5
Views: 22661

Re: Warm Up Period

What you seek to know may be covered on page 230 of the reference manual ************************************************************************************************* Monitoring internal temperature You can monitor the temperature difference between the actual internal temperature and the temper...
by brian.d.smith
September 12th, 2016, 7:54 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Warm Up Period
Replies: 5
Views: 22661

Re: Warm Up Period

I am confused why you want to read the status of warm up more than once? When the instrument achieves warm up status, it is warmed up for all time until you turn off the instrument. The behavior of the event log when read remotely is that of a software stack. When you pop a stack, the item that you ...
by brian.d.smith
September 12th, 2016, 6:05 am
Forum: Other Source Measurement Units (SMU)
Topic: Self trigger Pulse on 237?
Replies: 1
Views: 11213

Re: Self trigger Pulse on 237?

What sourcing task or measurement task are you attempting to accomplish? It is not clear why you would want the model 237 to source a trigger and receive this same trigger.

Please describe in detail what you want the model 237 to do for you.
by brian.d.smith
September 12th, 2016, 5:57 am
Forum: Electrometers
Topic: Breakdown Voltages Test
Replies: 3
Views: 18896

Re: Breakdown Voltages Test

Thank you for identifying the instrument you are using.

Before you write code, have you used the front panel to create voltages and measure current from the front panel? This will tell you if you have properly connected your device to the 6517B and that there are no noise or leakage problems.
by brian.d.smith
September 11th, 2016, 5:21 pm
Forum: Electrometers
Topic: Breakdown Voltages Test
Replies: 3
Views: 18896

Re: Breakdown Voltages Test

What instrument are you using?
by brian.d.smith
September 9th, 2016, 3:26 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)

This sort of ranging issue happens in a DMM as well. In a DMM, if you use the DC function to measure the average of a rectified AC signal, you have to choose a DC range that allows the PEAK of the AC signal to pass un-clipped. In your case, the spurious peaks that are above the ranged being used wil...
by brian.d.smith
September 3rd, 2016, 1:40 am
Forum: Resistivity Measurements
Topic: Low Resistance Measurement accuracy
Replies: 3
Views: 18401

Re: Low Resistance Measurement accuracy

You do not state what current you are forcing with the 2440 to measure your device. Please let us know the magnitude of the current you force from the 2440. The 2440 is capable of 5A. The 6221 has a maximum current of 100mA. Both the 6221 and the 2440 have a source uncertainty of 0.1% at their respe...
by brian.d.smith
September 3rd, 2016, 12:54 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Warm Up Period
Replies: 5
Views: 22661

Re: Warm Up Period

Please have a look at the DMM7510 Reference Manual page 3-44 3. Turn on instrument power and allow the instrument to warm up for at least 90 minutes. When the instrument has completed the warm-up period, a message is displayed and an information event is generated in the event log. You can peruse th...
by brian.d.smith
August 31st, 2016, 9:06 am
Forum: 2600 Series SourceMeter
Topic: 2602 voltage compliance during current pulse
Replies: 9
Views: 32276

Re: 2602 voltage compliance during current pulse

It does matter how the connections are arranged. Yo9ur connections look good as long as sense is inside of force. Here is how to get the factory scripts out of the instrument Start Test Script Builder Connect to the instrument Choose File->Import->Existing Project from Instrument->NEXT-> This brings...
by brian.d.smith
August 31st, 2016, 7:01 am
Forum: 2400 Series SourceMeter
Topic: Display does not turn on, fan is running
Replies: 4
Views: 19166

Re: Display does not turn on, fan is running

If what you are looking for is not in publicly available documentation, then we do not support this activity. We offer service for instruments that do not meet datasheet behavior.
by brian.d.smith
August 31st, 2016, 6:57 am
Forum: 2600 Series SourceMeter
Topic: 2602 voltage compliance during current pulse
Replies: 9
Views: 32276

Re: 2602 voltage compliance during current pulse

I am looking for exactly where the force and sense lines are connected. Please post a photo of where the force and sense lines are attached. Below is an example. The outside connections are current force. The inside connections are sense. This example uses two SMU channels. The same connection is va...
by brian.d.smith
August 30th, 2016, 9:50 am
Forum: 2600 Series SourceMeter
Topic: 2602 voltage compliance during current pulse
Replies: 9
Views: 32276

Re: 2602 voltage compliance during current pulse

It is unclear from your post what voltage you are measuring at your device using an oscilloscope. If you post the oscilloscope trace that would be helpful.
by brian.d.smith
August 30th, 2016, 7:18 am
Forum: 2600 Series SourceMeter
Topic: 2602 voltage compliance during current pulse
Replies: 9
Views: 32276

Re: 2602 voltage compliance during current pulse

Are you connected to your device with 2-wire or 4-wire connections?
by brian.d.smith
August 29th, 2016, 5:08 pm
Forum: 2600 Series SourceMeter
Topic: Abnormal contact resistance reading
Replies: 6
Views: 23958

Re: Abnormal contact resistance reading

Here are the instruction that I am now running smua.contact.speed = smua.CONTACT_SLOW rhi, rlo = smua.contact.r() print(rhi, rlo) print(smua.contact.r()) Here are the results from several runs TSP>3.92556e-01 3.66926e-01 3.98397e-01 3.86715e-01 TSP> TSP>4.33922e-01 3.69310e-01 4.00186e-01 3.82543e-0...
by brian.d.smith
August 29th, 2016, 1:57 pm
Forum: 2600 Series SourceMeter
Topic: Abnormal contact resistance reading
Replies: 6
Views: 23958

Re: Abnormal contact resistance reading

The Reference Manual details under what conditions an error occurs while executing a contact check. There are conditions for each of Output On and Output Off that will create an error. Look at the Reference Manual instruction description of smuX.contact.check() You should not be getting zero as a re...
by brian.d.smith
August 29th, 2016, 9:53 am
Forum: 2600 Series SourceMeter
Topic: Abnormal contact resistance reading
Replies: 6
Views: 23958

Re: Abnormal contact resistance reading

I connected a 47 ohm resistor. I used this code to return the contact resistance

rhi, rlo = smua.contact.r()
print(rhi, rlo)

Here is the result of the contact measurement

TSP>1.15478e+00 2.63691e-01

R Hi is 1.15
R Lo is 0.264

I used long triax alligator cables.
by brian.d.smith
August 29th, 2016, 9:43 am
Forum: 2600 Series SourceMeter
Topic: Abnormal contact resistance reading
Replies: 6
Views: 23958

Re: Abnormal contact resistance reading

9.91E+37 indicates that you have a broken connection. I just did an experiment with one of the sense connections not connected.
by brian.d.smith
August 29th, 2016, 9:01 am
Forum: 2600 Series SourceMeter
Topic: Abnormal contact resistance reading
Replies: 6
Views: 23958

Re: Abnormal contact resistance reading

Have you tried the programming example in the Reference Manual? I am posting the code below from the manual -- Restore defaults. smua.reset() -- Set speed to fast. smua.contact.speed = smua.CONTACT_FAST -- Set threshold to 100 ohms. smua.contact.threshold = 100 -- Check contacts against threshold. i...
by brian.d.smith
August 25th, 2016, 5:56 am
Forum: 2400 Series SourceMeter
Topic: Why Keithley 2400 Ohm measurement changes with source voltage
Replies: 8
Views: 30375

Re: Why Keithley 2400 Ohm measurement changes with source voltage

Are you using remote sense (4-wire)?
Are you using auto-ranging for the current measure?
When was your 2400 last calibrated?

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