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Old 31st March 2012, 05:15 PM   #131
styrkv is offline styrkv  Norway
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Thank you for answering locky_z.

The Oscope grafs was added to show that there is some measuring going on in all 3 settings.

I set the supply voltage so low because the opamp max voltage mentioned by Fred, just to be on the safe side.

The two first Curve tracer grafs looks reasonabl I think, but the third one seems too come out wrong. The same thing happens when I set VB 0.5 to 5V, constant VCE 10V.
A tiny graf at the left bottom corner.

I suspect there is something with software or calibration because the dropdownbox for
RC is from top to bottom:
1K
75
1K
12K

I think it measures what it should, but something in the calculation prosess goes wrong.
When RC is 4.55 and the software calculates from voltage drop as if RC is 1K I think the graf would be something like the third one.

I have Unit 127, if you have the files for different units saved.
The little configfile you open in notepad says RC0=4.55......

Regards Styrk

Last edited by styrkv; 31st March 2012 at 05:17 PM.
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Old 31st March 2012, 06:02 PM   #132
styrkv is offline styrkv  Norway
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In the calibration meny under current calibration it says RC0=1K
Maybe something there is wrong here, but I cant chance the values so I dont know what to do here.

Styrk
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Old 1st April 2012, 03:32 AM   #133
locky_z is offline locky_z  China
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Quote:
Originally Posted by styrkv View Post
In the calibration meny under current calibration it says RC0=1K
Maybe something there is wrong here, but I cant chance the values so I dont know what to do here.

Styrk
You select menu Options->Config,
select page 'Relay and resistor define',
If RC0 's value not '4.55' ohm,you can change it to '4.55' and save.
Note: Because float display problem, 4.55 may display as 4.55000019073486.
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Old 1st April 2012, 09:01 AM   #134
styrkv is offline styrkv  Norway
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Thank you very much locky_z !!!!

I am a very happy man today as I now can use the Curve Tracer for the full current range.
Attached Images
File Type: png CT Test RC 4R55 problem fixed.png (17.5 KB, 506 views)
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Old 1st April 2012, 04:21 PM   #135
rellum is offline rellum  France
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Hi locky_z,

I had the same issue as styrkv.
It has to do with the decimal separator. In many countries, it isn't a point but a comma. When first running the soft, the select box for Rc value of 4.55R appeared as 1K and the Constant Ib courrent feature didn't work, no base current was flowing at all.
To overcome this, I just replaced all the decimal points by a comma in the S7871_V3S.ini file.

I also got some inconsistent results from time to time. The schematic and the static measure feature were very helpfull to discover what was going on. Without any device inserted, VB was sometimes higher in value that VBH. I discovered a bad solder joint on the normaly closed contact of J6.

It's now working well and I must thank you Locky for this very powerfull and simple to use tool. For sure like pointed earlier, a best buy.

Francis
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Old 2nd April 2012, 04:06 AM   #136
locky_z is offline locky_z  China
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Quote:
Originally Posted by rellum View Post
Hi locky_z,

I had the same issue as styrkv.
It has to do with the decimal separator. In many countries, it isn't a point but a comma. When first running the soft, the select box for Rc value of 4.55R appeared as 1K and the Constant Ib courrent feature didn't work, no base current was flowing at all.
To overcome this, I just replaced all the decimal points by a comma in the S7871_V3S.ini file.
Francis
thank your reply
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Old 7th April 2012, 02:48 PM   #137
CeeVee is offline CeeVee  Portugal
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Locky_Z

I'm very happy with your curve tracer, still learning but i noticed that the big relays (J1 and J2 ) get very warm...is this normal ?

Last edited by CeeVee; 7th April 2012 at 02:51 PM.
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Old 8th April 2012, 01:18 AM   #138
locky_z is offline locky_z  China
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Originally Posted by CeeVee View Post
Locky_Z

I'm very happy with your curve tracer, still learning but i noticed that the big relays (J1 and J2 ) get very warm...is this normal ?
'The big relays (J1 and J2 ) get very warm' is normal.

The relay coil resistor is about 1K, so under 24V supply,It will consume 0.5W.


You can change LM317 output voltage, reduce 24V to 20V,because relay can also work in 20V.
24V power supply is only available to the relay power, and followed after 7812, a 12V power supply to the DAC.
Therefore, 24V reduced to 20V, will not impact on 7812.
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Old 8th April 2012, 09:35 AM   #139
CeeVee is offline CeeVee  Portugal
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Thanks Locky_Z for clearing this up.
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Old 4th May 2012, 08:41 PM   #140
NicMac is offline NicMac  Italy
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Fellow DIY'er,

I'm a newbie to curve tracing and I would like your help using this device. I can happily report that it seems to respond properly right out of the box! Thanks.

I would like to match 2SK170-BL devices (and 2SJ74-BL later on) using this instrument.

What settings should I use?

There are an overwhelming number of options and I really do not know where to start.

As many of us are using 2SK170's in our gear, and as several of us have or will have this curve tracer, I think it might be a good idea to use the same parameters.

Any help would be greatly appreciated!

Cheers,

Nic
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