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Search found 25 matches

by staylorEBAD
January 10th, 2018, 12:14 pm
Forum: 2400 Series SourceMeter
Topic: 2410 using RS-232 at 38.4k
Replies: 2
Views: 5853

2410 using RS-232 at 38.4k

The longest command being sent is INIT:IMM,cr> followed later by FETCH?<cr>. Neither are resent until after the meter returns data so the the meter input buffer is not being overrun. Even with the limited input command length the meter appears to be unable to handle 38.4k or faster reliably. GPIB is...
by staylorEBAD
January 5th, 2018, 12:51 pm
Forum: 2400 Series SourceMeter
Topic: 2410 using RS-232 at 38.4k
Replies: 2
Views: 5853

2410 using RS-232 at 38.4k

We have been using the 2410 and 2420 in a rack with other instruments using GPIB for years. Recently a few stand-alone requirements have come up and RS-232 is being used. At up to 19,200 (19.2k) baud we do not see any issues. At faster baud rates, 38.4k or 57.6k, meter errors can and do occur, espec...
by staylorEBAD
December 19th, 2017, 12:10 pm
Forum: 2400 Series SourceMeter
Topic: Read Data During a Sweep
Replies: 2
Views: 5988

Read Data During a Sweep

The reply from Tektronix to my support request asking the same question: "Thank you for your interest in Keithley products. My name is Joe Veneri. Unfortunately due to the way the sweep is ran/data is collected you can not read the contents of the buffer until the sweep is completed." I tried severa...
by staylorEBAD
December 15th, 2017, 7:55 pm
Forum: 2400 Series SourceMeter
Topic: Read Data During a Sweep
Replies: 2
Views: 5988

Read Data During a Sweep

Is it possible to read data from a 2410 during a list sweep? RS-232 is being used. There are no bytes in the port buffer until the sweep completes. Note: If the asterisk is on the display *RST does not clear it. TRACE:FEED:CONTROL NEVER must be sent. This is important if the meter changes back and f...
by staylorEBAD
September 15th, 2017, 10:40 am
Forum: 2400 Series SourceMeter
Topic: Shortest Pulse using 2410
Replies: 2
Views: 6943

Shortest Pulse using 2410

Forgot to add: The line disables all measurements: SENS:FUNC:OFF:ALL The next line turns voltage and current measurement back on. Commenting out this line results in a 2.3ms pulse. //SENS:FUNC:ON 'CURR','VOLT' As long as the external resistance is low enough that the meter is not voltage limited the...
by staylorEBAD
September 15th, 2017, 9:50 am
Forum: 2400 Series SourceMeter
Topic: Shortest Pulse using 2410
Replies: 2
Views: 6943

Shortest Pulse using 2410

This same code would apply to most if not all 2400 series source meters. The code below results in a pulse very close to 4ms long. Note: // starts a comment [in C#]. If anyone knows a way to further shorten the pulse I would be interested in knowing. *RST *CLS SYST:BEEP:STAT OFF SYST:RSEN ON *OPC? R...
by staylorEBAD
February 18th, 2015, 8:59 am
Forum: 2400 Series SourceMeter
Topic: RS-232 Control
Replies: 2
Views: 9236

Re: RS-232 Control

The meter shows RS-232 during power up. Yes we are using an USB to RS-232 adapter. An FTDI. US232R from Digikey. They have proven to be completely compatible over the past 6 years in any mode, settings or speed. I have used them extensively including communicating with meters from multiple vendors. ...
by staylorEBAD
February 17th, 2015, 2:38 pm
Forum: 2400 Series SourceMeter
Topic: RS-232 Control
Replies: 2
Views: 9236

RS-232 Control

We usually use GPIB to remotely program the 2400 source meters. For a single stand-alone unit we would like to use RS-232. The meter is set to RS-232, 8, N, 1, none, LF. Using both Hyper terminal and our own C# code the meter is unresponsive. We have tried a straight through cable with and without a...
by staylorEBAD
September 17th, 2014, 12:46 pm
Forum: 2400 Series SourceMeter
Topic: Timestamp Accuracy
Replies: 7
Views: 19615

Re: Timestamp Accuracy

Dale, All our meters use rev C32. The "8.192kHz/8" we could deal with whether or not the meter corrects. The problem is that the meter appears to miss one or more of the 0.9765625ms pulses every time the meter is read. This produces an error based on the read frequency that is not as objective in te...
by staylorEBAD
September 17th, 2014, 12:18 pm
Forum: 2400 Series SourceMeter
Topic: Timestamp Accuracy
Replies: 7
Views: 19615

Timestamp Accuracy

The time results on the previous post were approximately every 15th sample. Running further tests it is clear what is happening. Each time the meter is accessed for a read the timestamp loses time. The timestamp immediately after the SYST:TIME:RESET is 0.001953125 (seconds) The timestamp after 30 se...
by staylorEBAD
September 17th, 2014, 11:27 am
Forum: 2400 Series SourceMeter
Topic: Auto Output On and Off
Replies: 3
Views: 11345

Re: Auto Output On and Off

Dale,

That does turn on, wait 300 seconds, measure and then turn off. It doesn't however continuously update the display.

Scott
by staylorEBAD
September 16th, 2014, 4:08 pm
Forum: 2400 Series SourceMeter
Topic: Auto Output On and Off
Replies: 3
Views: 11345

Auto Output On and Off

Someone once programmed a 2420 to turn on, source 1A for 5 minutes and turn off. That person is gone and the program was inadvertently written over. We would like to recreate it. The display updated the entire time.

Would this be done with a [custom] sweep or is there another way?

Scott
by staylorEBAD
September 12th, 2014, 4:19 pm
Forum: 2400 Series SourceMeter
Topic: Timestamp Accuracy
Replies: 7
Views: 19615

Timestamp Accuracy

Andrea, The GPIB overhead would be an issue for a single event. In this case the computer is initiating a new SDM cycle multiple times per second with the meter returning to the idle state between each cycle. The computer time versus the meter time will probably vary a little due to GPIB (communicat...
by staylorEBAD
September 10th, 2014, 10:55 am
Forum: 2400 Series SourceMeter
Topic: Timestamp Accuracy
Replies: 7
Views: 19615

Timestamp Accuracy

I wanted to post some results from trying to speed up the read rate under program control. The code is optimized for highest sample rate. The effects of each command are listed below. The C# code sends an INIT:IMM, does some local processing of data, sends FETCH?, does a read and immediately sends a...
by staylorEBAD
September 10th, 2014, 10:18 am
Forum: 2400 Series SourceMeter
Topic: Timestamp Accuracy
Replies: 7
Views: 19615

Timestamp Accuracy

I found an older version of the User Manual, rev G. That has the accuracy section. What it says is that an 8.192kHz oscillator is used. The output is divided by 8 producing a 1.024kHz signal. Using firmware rev C17 and older the timestamp will be off by a factor of 1000/1024. Firmware rev C18 and ne...
by staylorEBAD
September 9th, 2014, 7:45 pm
Forum: 2400 Series SourceMeter
Topic: Timestamp Accuracy
Replies: 7
Views: 19615

Timestamp Accuracy

The 2400 Series User Manual (rev K - Sep 2011) index under D - Data Store list shows "Timestamp accuracy 9-4" just before "Timestamp format 9-4" I have looked thoroughly and cannot find any information on timestamp accuracy. The reason I would like to know is that using GPIB/SCPI the computer says 3...
by staylorEBAD
April 16th, 2014, 8:43 pm
Forum: 2400 Series SourceMeter
Topic: Status Word
Replies: 1
Views: 7253

Status Word

Series 2400 SourceMeter® User’s Manual 2400S-900-01 Rev. K / September 2011 says this on page 18-50 regarding the status word: "Bit 2 (Front/Rear) — Set to 1 if FRONT terminals are selected." The status word returned while the "REAR" indicator is visible on the front panel is this" 39944 (decimal) o...
by staylorEBAD
March 20th, 2014, 3:28 pm
Forum: 2400 Series SourceMeter
Topic: Problem with 2 sourcemeter 2400 3 prob measurement
Replies: 4
Views: 14621

Re: Problem with 2 sourcemeter 2400 3 prob measurement

Normally the gate is biased with respect to the source, not the drain. Polarity dependent on P or N type.

Also, make sure auto-range is turned on. Sometimes manually selecting read V and I is necessary to force the source portion of the meter into the proper range.

Scott
by staylorEBAD
March 20th, 2014, 3:17 pm
Forum: 2400 Series SourceMeter
Topic: Checking meter output when on or off
Replies: 1
Views: 7444

Checking meter output when on or off

I recently had intermittent problems with a 2410 using GPIB. The meter would ignore commands to turn off. The meter has been repaired but since the problem was intermittent repair was not positive they got everything. So, my question is this, "What SCPI command/response will indicate whether the met...
by staylorEBAD
December 11th, 2013, 8:16 pm
Forum: 2400 Series SourceMeter
Topic: SMU basic question
Replies: 3
Views: 11384

SMU basic question

The 2400 series SMUs work as a DMM at the touch of a button with some limitations. I have never used a 2600 but they probably do the same thing. Be aware that there is a significant difference in some cases. When measuring ohms a standard DMM will usually limit the measurement current to 1mA or less...

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