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| FAQ's to Software | FAQ's to Physics |
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Is a special Setup for Windows available?
Yes, you find the special Windows Setup program at disk 0 or in the internet at the downlaod page. With this setup it is possible to start the DLTS program from the Windows desktop. It give tips for the CONFIG.SYS and AUTOEXEC.BAT files. There is also a Windows program to convert binary DLTS data to ASCII. -
Which files are at the download page?
Additionally to the full full sofware and the bugfix and confif package there is a package to make running of DLTS in a DOS box of Windows and SetUp for Windows 95/98/NT easier. -
Does the DLTS program run under Windows?
The DLTS simulation program runs in the DOS box of Windows 95/98, Windows NT and Windows 2000. The measure software works under Windows 95/98. Because the hardware access of the IEEE board it is not guaranteed that the measure program works under Windows NT and Windows 2000. Tests on some compters show that the IEEE board and so also the measure program runs under Window NT 4.0 and Windows 2000. The communication seems to be a little bit slower than under Windows 95/98. Additionally you can get timing problems especially if one IEEE device (temperature controller) is switched off. For the work under NT/2000 you have to switch the IEEE mode from 0 (auto) to 3 (EMS) in the DLSET program at PC configuration. In this case the program dont use the IEEE ROM BIOS but the EMS or the normal memory. Please use then EMS and disconnect the ROM on the IEEE board because memory problems. For NT/2000 you have also install the IEEE driver by the DLTS Windows SetUp program. -
Can we use the Keithley PCI IEEE board?
In the DOS box of Windows 9X you can use the PCI IEEE board for the DLTS measure program. Here you must call after every PC boot the Keithley program PCICONF 2B8 to map the IO port. The best is to include this in the AUTOEXEC.BAT file, see in the directory DLTS\DLTFS\INSTALL\DEFAULT for an example. Under Windows NT is the use of the PCI board for the DLTS program not possible. -
Which printers are possible?
You can use all printers with standard PCL3, that are the most HP printers. With PCL3 you get black/white and 8 colors plots as a hardcopy, that means only in the screen resolution. For higher resolutions or more colors you need a printer with PCL5 resp HPGL. All HP LaserJets, the PaintJet series and the deskjets HP 1200, HP 1600 and HP 2500CM supports this language. Click here to load a monochrom or color PCL test file. For testing a printer then you have to type from the command line: COPY /B MONO.PCL LPT1 resp. COPY /B COLOR.PCL LPT1. You should get a monochrom resp. a color vertical (portrait) plot at the top of page. An other possibility to print out DLTS plots is under Windows to save a file as BMP, HPGL or EPS and then read and print it by a Windows graphic program. -
My printer dont print under Windows. What have I to do?
Call the DLTS SetUp program, either by DLSET from the DOS command line or by the DLTS Windows program SetUp (Button DLTS). Then go to the input window "Install printer configuration". Select in line 2 for the printer type "PCL color DeskJets". In the next line (connection of printer) must be parallel port selected. In line 4 you have to select the parallel port, LPT1 or LPT2. In the next line define network/spooler mode for printer. Select mode 2 (standard), 3 (network) or 4 (network,copy). The mode 2 is the standard. If you get time out problems, try mode 4 (network,copy). In this case you have to define in the next line the copy command, it is "COPY /B +++ LPT1" for a printer at LPT1. For a more detailed information type in every line of the setup program Alt-F1. To check whether the problems come from Windows, run under Windows 95/98 the DLTS program in the DOS mode (not DOS box) and try to print. -
My HP DeskJet 895C shows under Windows 98 only the beginning of a plot,
the comments section is a series of black rectangles!
Check your Windows printer configuration. In the Windows printer Setup (properties) or in the HP Configuration program the "Spool DOS Print JOB" must be disabled. -
With my HP DeskJet are not horicontal plots possible!
- Most of the DeskJets have only the PCL3 language. Normally this language dont support the rotation of plots direct by a printer command. So here you get only vertical and not horicontal plots. How many samples can handle the optional switching box?
The switching box can handle 6 samples.
There is a list of supported temperature contollers in the software. Use DLSET and you can list them when you try to select different temperature controllers.
Auto tuning does not work very well with DLTS. The problem is that we are continuously changing temperature and every time the temperature is changed the controller tries to reset the PID. This makes a very very very slow measurement.
For testing the controller, you should start the DLTS program with the controller attached. If it starts correctly the first test is gone. If not, you should check the IEEE address of the controller and of the software. If the software had started correctly, the controller should be in remote mode, may be this can be checked at the front panel. If it is in remote mode everything is fine. The next check is the transfer of the temperature data. For this use ALT F5 key. You should directly see the temperatur in the upper line of the screen. If this is OK you can check the setting of the temperature. Use ´T´ for setting the temperature. If this also works, you can see it, if the temperature value has been transferred to the controller,the controller is installed and should work correctly. If something of the above is not working, you have to change the cryo init file with an ASCII editor like ´editor´ or ´wordpad´. The file name is Cryo_XX.DAT in the directory DLTS\DLTFS\HARDCONF\CRYO where XX is the number of cryo file. You find a complete description in the file DLTS\DLTFS\DOC\CRYO.DOC.
This description is in the CRYO.DOC file in line 173 until 200. An example for temperature depending commands is in the file CRYO_52.DAT, starting at line 94. The commands are for the new BioRad controller. You can have 1 until 6 command lines for every temperature range. Following example: 1 \s2 25\|\s12 61\|\s13 51 means set P, I and D values to 25, 61 and 51 in command mode 1. Command mode 1 means that this command will only be sent if the temperature decrease and the temperature steps are bigger than 10K.
The Boonton has four different ranges, range 1: 3pF full scale, range 2: 30 pF full scale, range 3: 300pF full scale abd range 4: 3000 pF full scale. The other ranges given in the Boonton manual are only valid if using the internal meter and not as we do the the external output. For all ranges the resolution is given by 0.5% of the full scale reading (refer to Boonton manual p.1-3). This gives a resolution for each range of : range 1: 0.015pF, range 2: 0.15pF and so on. Our standard range for defining the zero capacitance during the calibration procedure and for checking contact is range 2. That means, all changes below 0.15 fF are not important as long as you use range 2.
The system noise is checked with a standard commercial diode with app. 50pF (Z-diode is fine) directly attached to the Boonton inputs (without cryo). This gives you the system noise. You can't measure noise without a sample. Without a sample the probes will be floating and you will get very bad noise figures. The complete noise depends mostly from the Ohmic contact and the cryo. Noise measurement is clearly described in Chapter 6.4 of the manual.
Measurement conditions for current DLTS are not the same than for capacitance DLTS. The noise depends mostly from the Ohmic contact (sample) and the cryo system. May be you can try to measure out of the cryo. The theoretical limit is somewhere in the 10 pA, but without the Boonton meter attached. In general, the Boonton meter should not be attached to the sample, the sample should be directly connected to the electronics (Ohmic contact to I-input, Schottky contact to Bias output of the electronics).
| FAQ's to Software | FAQ's to Physics |
