Keithley 2400 record data problem

Hi,
I use Keithley 2400 to Measure I-V curve, at a sweep mode, like scan the V from 0 to 0.2 V, at low NPLC(eg. 0.1), the data can be recorded very successful and save to data.txt. But when I increase the NPLC (eg. 5 or 10,), this vi usually cause some problem. When the scan votage reach the 0.2 V, the keithley display panel stops at 0.2V and shows this current, the VI still shows at working, and no data recorded in the data.txt. In the correct process, Keithley display panel shoud show the "OFF" and the VI also stop working, and the data recorder correctly. Could some one help me out of this? Thank you very much.
Attachments:
24xx_Swp-V_Meas-I_gpib.llb ‏373 KB

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Similar Messages

Keithley 2400 Problems

Hi,
I'm trying to run a Keithley 2400 SourceMeter with LabView using the latest driver (Keithley 24XX) and the example VI "Keithley 24XX Read Single.vi".
After selecting the GPIB Adress I run the program and Labview throws the following error message:
Error -1074000000 occurred at Keithley 24XX.lvlib:Error Query.vi
Possible reason(s):
Instrument reports:
-113,"Undefined header"
-230,"Data corrupt or stale"
-420,"Query UNTERMINATED"
0,"No error"
Complete call chain:
Keithley 24XX.lvlib:Error Query.vi
Keithley 24XX.lvlib:Read (Multiple Points).vi
Keithley 24XX.lvlib:Read (Single Point).vi
Keithley 24XX Read Single.vi
I also have a Keithley 2000 Multimeter up and runing with it's latest driver and the example program and it works just fine.
What could be the problem?
Thanks in advance!
Solved!
Go to Solution.

There should be examples with those drivers. If not, then go through the driver palette and think about what you would do manually. Find those functions to do what you would do manually.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions

KEITHLEY 2400 code problem

Hello
I am trying to acquire data from keithley 2400 using labview 9, NI VISA 4.5.1, and serial RS 232 interface.
I used the attached "Keithley 24XX Read Single.vi" ( obtained from NI certified drivers ) and got this message-
Error -1073807346
occurred at VISA Write in Keithley 24XX.lvlib:Error Query.vi->Keithley 24XX.lvlib:Configure Measurement.vi->Keithley 24XX Read Single.vi
The keithley meter indicated "REM", as soon as VI was run, which means "Remote" operation and froze up.
Under MAX, i can see COM1 and device status is "Device is working properly"
Kindly help in debugging
1. Should i use GPIB? Are the drivers good for serial interface? I used the first NI certified driver indicating serial/GPIB compatibility.
2.Is keithley meter being recognized by MAX?
3. Any errors in the codes?
Regards
poli
Attachments:
Keithley 24XX Read Single.vi ‏24 KB

you guys are amazing!
I switched off all other vi and tested the "Basic serial read and write.vi". It worked fine.
So the first step regarding MAX communication is ok.
Now, i tested the attached "Read (Single Point).vi and it showed the following error, after some time.
code = -1073807339
VISA Read in Keithley 24XX.lvlib:Error Query.vi->Keithley 24XX.lvlib:Read (Single Point).vi
If i get this to work, that will solve the problem.
Attachments:
Read (Single Point).vi ‏17 KB
Keithley 24XX.lvlib ‏12 KB

"Read Single Point" Keithley 2400 Problems

Hello!
I am recentely having some problems with the "Read Single Point Measurements" function in Labview 2012. I have already sucessfully used my Keithley 2400 in other programs to sweep the voltage, but now I am trying to use it also to read the current across my sample.
I wrote a very simple program, which resemble the one you can find among Labview examples (see 1st attachment). The only differences are a sweep-subVI and a "for" cycle. My problem occurs at the "Read" Keithley function. On the Keithley's screen I have the following errors:
- 113 : undefined header;
- 230: data corrupt or stale;
- 420: query unterminated.
While in the Block diagram, when the system gets to the "read" function, the error -1074000000 shows up.
I have found a lot of posts on this topic, but unfortunately I could not find the any solution for me. I also tried the 2nd attached program, to check the comunication to the instrument, but errors still occur. In "Measurements and Automatic", it says that the instrument is working properly.
Do you have any ideas?
Thanks
Attachments:
Keithley 24XX Sweep and Acquire Measurements.vi ‏26 KB
Basic Serial Write and Read (1).vi ‏26 KB

The following video demonstrates how to check the firmware revision: http://www.keithley.nl/centralized_display?mn=2400&assetid=55934.
In order to update the firmware you will be need to download a flash program and the firmware file. gAfter obtaining the Flash program and the Firmware file from Keithley Application support staff, unzip the three files in a folder of your choice and run the "setup.exe" program. Follow the instructions to install the program. When the installation is complete, launch the program from your Windows Start menu under Programs/Keithley Instruments. The Application support staff will also provide the file for the latest firmware revision. Put that file in a folder where you can find it and then run the Flash Wizard32 program. The program will autodetect the instrument and request to specify the firmware file.
This link contains the flash program: http://www.keithley.com/base_download?dassetid=52609
See attactment for the firmware revision.
Attachments:
2400c30.zip ‏358 KB

Problem In Update Statement In Multiple Record Data Block

Hi Friends,
I have problem in update Statement for updating the record in multiple record data Block.
I have two data Block the master block is single Record block and the 2nd data block is Multiple Record data Block.
I am inserting the fields like category,and post_no for partiular job in single data block
Now in second Multiple Record Data Block,i am inserting the multiple record for above fileds like no. of employees work in the position
There is no problem in INSERT Statement as it is inerting all record But whenever i want to update particular Record (in Multiple Block) of employee for that category and Post_no
then its updating all the record.
my code is Bellow,
IF v_count <> 0 THEN
LOOP
IF :SYSTEM.last_record <> 'TRUE' THEN
UPDATE post_history
SET idcode = :POST_HISTORY_MULTIPLE.idcode,
joining_post_dt = :POST_HISTORY_MULTIPLE.joining_post_dt,
leaving_post_dt = :POST_HISTORY_MULTIPLE.leaving_post_dt,
entry_gp_stage = :POST_HISTORY_MULTIPLE.entry_gp_stage
WHERE post_no = :POST_HISTORY_SINGLE.post_no
AND category = :POST_HISTORY_SINGLE.category
AND roster_no = :POST_HISTORY_SINGLE.roster_no;
AND idcode = :POST_HISTORY_MULTIPLE.idcode;
IF SQL%NOTFOUND THEN
INSERT INTO post_history(post_no,roster_no,category,idcode,joining_post_dt,leaving_post_dt,entry_gp_stage)
VALUES(g_post_no, g_roster_no, g_category, :POST_HISTORY_MULTIPLE.idcode, :POST_HISTORY_MULTIPLE.joining_post_dt,
:POST_HISTORY_MULTIPLE.leaving_post_dt,:POST_HISTORY_MULTIPLE.entry_gp_stage);
END IF;
next_record;
ELSIF :SYSTEM.last_record = 'TRUE' THEN
UPDATE post_history
SET idcode = :POST_HISTORY_MULTIPLE.idcode,
joining_post_dt = :POST_HISTORY_MULTIPLE.joining_post_dt,
leaving_post_dt = :POST_HISTORY_MULTIPLE.leaving_post_dt,
entry_gp_stage = :POST_HISTORY_MULTIPLE.entry_gp_stage
WHERE post_no = :POST_HISTORY_SINGLE.post_no
AND category = :POST_HISTORY_SINGLE.category
AND roster_no = :POST_HISTORY_SINGLE.roster_no;
AND idcode = :POST_HISTORY_MULTIPLE.idcode;
IF SQL%NOTFOUND THEN
INSERT INTO post_history(post_no,roster_no,category,idcode,joining_post_dt,leaving_post_dt,entry_gp_stage)
VALUES (g_post_no,g_roster_no,g_category,:POST_HISTORY_MULTIPLE.idcode,
:POST_HISTORY_MULTIPLE.joining_post_dt,:POST_HISTORY_MULTIPLE.leaving_post_dt,:POST_HISTORY_MULTIPLE.entry_gp_stage);
END IF;
EXIT;
END IF;
END LOOP;
SET_ALERT_PROPERTY('user_alert',ALERT_MESSAGE_TEXT, 'Record Updated successfuly' );
v_button_no := SHOW_ALERT('user_alert');
FORMS_DDL('COMMIT');
CLEAR_FORM(no_validate);
Please Guide me
Thanks in advence

UPDATE post_history
SET idcode = :POST_HISTORY_MULTIPLE.idcode,
joining_post_dt = :POST_HISTORY_MULTIPLE.joining_post_dt,
leaving_post_dt = :POST_HISTORY_MULTIPLE.leaving_post_dt,
entry_gp_stage = :POST_HISTORY_MULTIPLE.entry_gp_stage
WHERE post_no = :POST_HISTORY_SINGLE.post_no
AND category = :POST_HISTORY_SINGLE.category
AND roster_no = :POST_HISTORY_SINGLE.roster_no;
AND idcode = :POST_HISTORY_MULTIPLE.idcode;
UPDATE post_history
SET idcode = :POST_HISTORY_MULTIPLE.idcode,
joining_post_dt = :POST_HISTORY_MULTIPLE.joining_post_dt,
leaving_post_dt = :POST_HISTORY_MULTIPLE.leaving_post_dt,
entry_gp_stage = :POST_HISTORY_MULTIPLE.entry_gp_stage
WHERE post_no = :POST_HISTORY_SINGLE.post_no
AND category = :POST_HISTORY_SINGLE.category
AND roster_no = :POST_HISTORY_SINGLE.roster_no;
AND idcode = :POST_HISTORY_MULTIPLE.idcode;These update statements are without where clause, so it will update all records.
If it is specific to oracle forms then u may get better help at Forms section.

Problem with Keithley 2400 source meter

Hello all,
I tried to controll a keithley 2400 source meter with Labtracer using a NI GPIB-USB-HI card but when I run the test is send me this error message: "There was ab error reported on Visa Read in Query. Test aborted. Error code: -1073807339"
is this card (NI GPIB-USB-HI) able to controll keithley 2400 source meter ?
the keithley 2400 source meter screen show "REM TALK" during the running of the program,
I installed NI488227 in my computer (windows XP) and also "Agilent Connection Expert", this later also show no possibilty to connect with the Keithley meter, I attached a file for "Agilent Connection Expert".
Any help is appreciated
Thank you by advance
Attachments:
ACE.docx ‏133 KB

Follow the preliminary steps to first check if the device is able to communicate via the GPIB-USB convertor.
navigate to: Start>>National Instruments>>NI 448.2>>Interactive control. Use this utility to query the GPIB device for some standard commands for e.g.: *IDN?
There is also a GPIB analyzer in the above path which you can use to verify the device connectivity to the system.
Also for communicating the with 3rd party GPIB devices always enable " NIVisa Tulip.dll" which will help recognising the device in max. Look at the picture to enable this option in max.
post back for queries
With regards,
JK
(Certified LabVIEW Developer)
Give Kudos for Good Answers, and Mark it a solution if your problem is solved.
Attachments:
tulip.jpg ‏175 KB

I am doing one Labview project. so my project is about design a interface in labview which one collect the data from keithley 2400 via GPIB connection.

i am doing one Labview project. so my project is about design a interface in labview which one collect the data from keithley 2400 via GPIB connection. any suggestion please

Your first task should be to just be able to send commands to the instrument. Do as Dennis suggested and download the drivers for the instrument and get familiar with them. Build up small VIs that do little tasks with those drivers so you can get used to them. Then worry about your main interface.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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How to set the time difference between each data when sweeping voltage using keithley 2400

Hello friends,
I am using the sweep vi from Keithley in the SWEEP and Acquire measurement vi.I want to measure the voltage for every step and insert a delay in between every two data, so I need some delay between each I step.
I am a starter to use Labview, thanks so much for your answers.
Perry
Solved!
Go to Solution.
Attachments:
Keithley 24XX Sweep and Acquire Measurements.vi ‏26 KB

As Dennis said, if you're using the built-in sweep function, you'll have to check the manual. See Section 10-16 (That's section 10 page 16, not sections 10 though 16) of the Keithley 2400 User Manual.
The Keithley 24xx series has a measurement speed in units called PLC (Power Line Cycles). The default speed is 1PLC, meaning a measurement is taken every 1 power line cycle, or 1/60th of a second (16.67ms). 24XX's can go from 0.01 PLC (every 0.16ms) to 10 PLC (every 166.6ms). The faster you measure, the lower precision you get.
To set this value programmatically, the command is
ENSe:CURRent:NPLCycles <n>
ENSe:VOLTage:NPLCycles <n>
depending on what you're sensing and where <n> is the number of PLCs from 0.01 to 10.
Another factor that will determine the time between data points is the SDM cycle. These are more complicated, look at your Keithley user manual for more information. Look at Section 6 and Section 11 for more info.
Note:
PLC times are based on a US cycle of 60Hz.

Keithley 2400 Meter Read dans une boucle - probleme de status byte read

Bonjour,
j'utilise un Keithley 2400 pour mesurer un potentiel. J'ai débuté en utilisant le modèle Read.vi du driver. Dans mon cas, la portion "read single" se trouve dans une boucle for et après un certain nombre de mesures (cela semble aléatoire), la fonction gèle et en remontant les étapes, on découvre qu'il s'agit de la lecture de "status byte" qui ne reçoit aucune réponse en amont. Il faut alors redémarrer complètement le programme. Celà survient à chaque fois et après un nombre d'itérations variable.
J'ai même tenté de mettre une boucle while directement dans l'exemple "read single" (le .vi) et le problème est exactement le même, même si on ajoute un wait à la boucle. Après un certain temps, ça gèle et c'est le status read qui ne reçoit aucune réponse.
Merci.

Bonsoir PG123,
Ce que je vois directement dans votre VI c'est le fait que vous exécutiez à la vitesse maximum votre boucle While sans le moindre cadencement ne laissant ainsi jamais de temps disponible au processeur pour effectuer d'autres tâches. Il est propable de plus que l'instrument ne supporte pas un nombre de requêtes aussi élevée saturant peut être son buffer ou ne laissant pas le temps à l'instrument d'écrire correctement les valeurs.
De plus, je pense que vous n'avez pas besoin de récupérer à la vitesse maximum toutes les valeurs possibles provenant de votre instrument. C'est pourquoi je pense qu'une lecture toutes les 200ms suffirait déjà amplement.
Voici donc à quoi devrait ressembler l'intérieur de votre boucle While :
Essayez avec un cadencement d'1 seconde (1000ms en entrée de la fonction) dans un premier temps et voyez si le problème de gel se produit. Si ce n'est pas le cas, vous pourrez alors progressivement diminuer la valeur de cadencement (jusqu'à 200ms minimum, celà devrait suffire comme déjà dit au dessus.
Cordialement,
Jérémy C.
National Instruments France
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Travaux Pratiques d'initiation à LabVIEW et à la mesure
Du 2 au 23 octobre, partout en France

Keithley 2400 Real Time Resistance Values in LabView 2010

Hi,
I keep getting Error 803 and Error -230 on my Keithley 2400 SourceMeter (connected NI-GPIB-USB-HS; everything is talking correctly) when I use the attached LabView program. I'm using the most updated drivers for VISA, 488.2, and the KE24XX. I've looked at the VI Tree and everything should be okay. Individually, the VIs are not causing errors. Also important to note is that when I take 4W resistance readings from the Keithley without the PC interface the Keithley's display indicate different settings, including ARM, while when recording from computer it displays AUTO and 4W. No data is displayed on the device while recording from computer, while data is displayed without recording from the computer.
Please let me know what you think. Thank you!
Attachments:
resistdatawrite.png ‏217 KB

Hi coldcarbon!
I did a search and it looks like this is not a totally uncommon occurrence with these devices. I found a few forums searching google, and also was able to find a discussion forum at Keithley's website. These drivers look like they were built by Keithley, and I would encourage you to get in touch with them to figure out what exactly is going on. I wouldn't jump to that issue being a hardware problem just yet.
Get back in touch with us after you talk to Keithley and we might be able to help you more with this issue, but it is probably an issue with the software, and Keithley would definitely be the people to talk to.
Ben N.
Applications Engineering
Certified LabVIEW Developer

Programmed vs measured voltage on Keithley 2400 and other things

Hello everyone,
I have two issues with our Keithley 2400, which we control through Labview, and I would be very grateful for some help/advice. The issues are listed below:
1) We use the 2400 for 4-point probe measurements, so we plot graphs of current vs voltage to get the resistance from the slope of the curve. However, when we look up the data generated during a measurement, the voltage sweep values that we program often, but not always, do not match the measured voltage values. For example, what was meant to be 1 V, might actually end up being 1.2 V or maybe 0.8 V, this can be both positive and negative with respect to the programmed values and is not constant. This also leads to the fact that our curves, although straight (so Ohmic conductor), do not go through the (0, 0) point on the graph.
2) Second problem is that we would like to determine what is the time between successive measurements in a voltage sweep. We have tried some example vi files that by default come with the Labview, e.g. Keithley 24XX Read Multiple - SW Trigger or Keithley 24XX Read Multiple. If someone knew how to find the time separation, then we would be grateful. We only have control over the number of invididual readings taken and the timeout, which we guess is the maximum time allowed for the measurement.
Many thanks!

Good Afternoon PiotrW,
1. Could you please provide the code you are using to program the voltage sweeps?
2. You could use the timestamp output of the Keithley 24XX.lvlib:Read (Multiple Points).vi to allow you to find the time difference between successive samples. It should be a simple case of subtracting succesive measurements from each other to find the time difference between data points.
Regards,
Al
Regards,
Al C
National Instruments,
Application Engineer

Keithley 2400 Trigger 2000

Hi,
I have tried for a couple of days to let a Keithley 2400 source current and measure voltage and at the same time trigger a DMM2000 on which a current will be measured. This is for use in a LIV characterization. I�m using Labview but prefer to write directly to the bus instead of using the Labview drivers, which I find a bit complicated to use.
First I configure the 2400 with the following commands
*RST;
TRAC:CLE;
SOUR:FUNC:MODE CURR;
SOURWEPAC LIN;
SOUR:CURRTAR 0;
SOUR:CURRTOP 0.1;
SOUR:CURRTEP 0.0001;
TRIG:COUN 100;
SOUR:CURR:MODE SWE;
SENS:FUNC "VOLT";
FORM:ELEM CURR,VOLT;
TRIGOUR TLINK;
TRIG:INP SOUR;
TRIGUTP SENS;
Then I write the following to the DMM 2000 to initialize
*RST;
TRAC:CLE;
SE
NS:FUNC "CURR";
TRIGOUR EXT;
TRIG:COUN 100;
Now the two instruments should trigger each other.
I then write to the 2400 to turn on and initiate the sweep.
OUTP ON;
INIT;
And finally an INIT is sent to the DMM2000 to initiate this instrument
This starts the measurement ONLY if the instruments have been turned on just before the program is executed.
If I run the full program again it doesn�t start. What is wrong?
If I run the program from the initialization of the 2000 it works well. But if the intialization of the 2400 is included it just wont start the sweep.
Any suggestions?
Regards
Francis

You may wish to try this. I struggled with a 2400 for some time. After a single reading, the buffer in the 2400 contains current, voltage, ohms, a timestamp and another variable. You have to read the entire buffer of the 2400 or it ignors future commands. I struggled with the 2400 drivers also. The help files of the drivers did not describe one of the variable inputs. Finally, I figured out that it was leaving data in the buffer. I increased the variable to read all five values and it finally worked!
You will have a different solution because you are not using the drivers. But I suspect you may have the same problem. You will have to write commands to be certain you extract all measurment information for the reading. Perhaps the DMM may also have a simi
lar feature. If you do not read all the data, the systems will hang.

Help needed with missing data problem in CRVS2010

We recently upgraded the reporting engine in our product to use Crystal Reports for Visual Studio 2010 (previously engine was CR9). Our quote report, which has numerous subreports and lots of conditional formatting, started losing data when a quote took more than a single page to be printed. We knew the SQL results included the data, but the report was not printing those lines at all or sometimes printing a partial line. In addition, the running total on the report would exclude the lines that were being missed on the next page. In one example submitted by a customer, 3 lines were skipped between pages.
I think I have identified two potential issues that document the possibility of data not being included in the report.
The first potential issue is an issue with the "suppress blank section" option being checked. This issue is supposedly fixed with ADAPT01483793, being released someday with service pack 2 for CRVS2010.
The second potential issue is using shared variables. This issue is supposedly fixed with ADAPT01484308, also targeted for SP2.
Our quote report does not explicitly use shared variables with any of the subreports, but it does have several subreports, each in its own section that has the "supress blank section" option checked. We have other reports that use this feature, as well, and they are not exhibiting the problem.
One different thing about the quote report is that it has a section with multiple suppression options selected. The section has a conditional suppression formula, which controls whether the section is included at all within the report. The section also has the suppress blank section option selected. There are multiple fields within the report that are each conditionally suppressed. In theory, the section's suppress formula could evaluate to true, yet all of the fields within the section are suppressed (due to null values), and then the "suppress blank section" option would kick in.
The missing data only seems to happen when the section is not being suppressed, and at least one of the fields is being included in the report. If I clear the "suppress blank section" check box, and change the section formula to also include the rules applied to the fields in the section, the missing data problem seems to be resolved.
Is this related to ADAPT01483793? Will it be fixed in service pack 2?
If more details are needed, I would be happy to provide a sample report with stored data.

Hi Don,
Have a look at the Record Selection formula in CR Designer ( stand alone ) and when exported to RPT format opening that report in the Designer also.
There's been a few issues with => logic in the record selection formula. It could be you are running into this problem. Look for NOT inserted into your selection formula.
Oh and SP2 is coming out shortly so it may resolve the issue. But if you want you could purchase a support, or if you have a support contract then create a case in SMP and get a rep to work with you to debug the issue.
If you have not try the Trial Version of CR 2011, put it on a VM-ware image or Test PC so you don't corrupt anything for production and have a look at and test it in that designer also. If you purchase a case and it is a bug then you'll get a credit back for the case.
Don
Edited by: Don Williams on Oct 26, 2011 7:40 AM

How can I record data from 2 devices synchronously

Hi,
I've been working on this VI for some time now and I've already recieved some prior help from these forums, so I hope I can get this problem solved.
I have a DAQpad 6020e, a hot wire thermo anemometer, and Labview 7.1. I need to take voltage measurements from the DAQpad at a scan rate I specify (I have it set to 1000 in the screenshot), while simultaneously taking readings from the anemometer. However, the anemometer only takes readings every 1.6 seconds, which it sends to the serial port in ASCII.
I have tried many iterations of this vi to try to get the data to come out synchronously. By synchronously, I just mean I want both measurements to START at the EXACT same time. Obvisously the scan rates are drastically different so I will have far more measurements from the DAQpad, but that is ok so long as both measurements start at the same time. I cannot control when the anemometer makes its reading, so what I have attempted to do is as follows:
1. VI starts, both reads initialize, then DAQpad scan begins.
2. If Scan Rate and "Scans to read" are equal, it takes one second for measurements to start being recorded from the DAQpad.
3. In an attempt to synchronize the measurements, I attempted to tell the anemometer WHILE loop (serial) to wait until the first measurement has been recorded from the DAQpad. (**Note, I have also tried using the "number read" lead off of the AI read command).
4. Because I only get 1 reading from my anemometer per 1.6 seconds, I can't predict when the next reading will be. But I want my measurements to be corrolated in time, so I have attempted to start the measurement file as soon as the case structure starts. This way, even if the very first reading is invalid, the rest of the readings will be valid and will be taken at times that directly correlate with the DAQpad measurements.
I have run this vi many times, with different results. I have gotten it to run sucessfully many times, meaning that both measurement files started recording data at the exact same instant, even if the anemometer reading wasn't available yet (I know this because the second measurement was taken at a time earlier than 1.6 seconds, meaning that the file did not wait for a measurement to be obtained in order to assign a value at 0 time). HOWEVER, other times, this vi does not run correctly. Sometimes the anemometer readings begin before the DAQpad readings, sometimes after. In every case where the vi does not work, it appears that the anemometer measurement has waited for its first measurement to be recorded at time 0 instead of starting the measurement file when the DAQpad starts.
I need to know why this vi doesn't run consistently. I can see it do what I want it to do over and over again, but I can't use this vi if it is not 100% consistent.
Thank you,
Jake
Attachments:
LabVIEW Synchronization Attempt.pdf ‏78 KB

For future reference, just post the actual VI. It is easier to troubleshoot than a print as a PDF.
Given the software complexities of separate threads and serial bus versus PCI bus, I don't see how you can say that the measurements actually start at the same time. The only way you can say that the measurements started together was if you were using a hardware trigger.
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DVD-R recording/burning problem on Satellite P20

I have a Satellite P20 notebook with a Multi Dvd-RAM drive (which should support both DVD-RAM, DVD-R and DVD/RW discs for recording). I'm experiencing some difficulties recording data to DVD-R discs - basically when I insert a blank DVD-R the D drive is not even accessable.
I have tried recording to a DVD-RAM disc which worked fine (went through the usual procedure of turning off regular CD recording etc) so it only seems to be DVD-R's which are the problem.
any ideas people?

You should check if the recording function in the drive properties is enabled.
Please check also this Toshiba document:
http://support.toshiba-tro.de/kb0/TSB6201ED000ER01.htm
Have found also this very useful FAQ:
http://support.toshiba-tro.de/kb0/FAQ6701IH0004R01.htm
Maybe it will help.

Keithley 2400 record data problem

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