Electronics > Beginners
can I build this curve tracer circuit with an AWG?
rhb:
That looks quite good.
Mortymore:
I know that this post is a bit old but for future reference, here's some curve tracing with 2 different AWGs.
Apart from the AWG and the Oscilloscope, all that's needed is a couple resistors and some care on the values chosen, so the AWG will not be overload.
So here it goes, something like this: "Forgive me the crudity of the schematic, I didn't had the time to put it on scale or to paint it"
Option 1) Results with the more recent test gear, AWG: Siglent SDG-1032X (Max.Iout: 200mA) and Scope: ISO-Tech IDS-2074E
EDIT2: Something posted on an GW-instek GDS2000E scopes that adds to the subject.
To draw a PNP curve in the same way as a PNP, invert ch.1 and ch.2 on scope
Option 2) Results with some old/cheap gear, AWG KKmoon MHS-5225A and Scope: Tektronix 2445
For NPN: BC547B
For PNP: BD140
Setting the signals needed on the SDG-1032X is fairly easy. He has built in the ramp and 8 step signals.
But the MHS-5225A only has the ramp, so the 8step signal had to be built (rampup_8steps.csv attached). For the PNP transistor is just a matter of inverting the signals.
MHS-5225A settings for NPN
MHS-5225A settings for PNP (ch.2 on the scope is inverted)
EDIT: In all cases, don't forget to set the proper signal offset so they start at 0Volt
Steps vs value to be set for the 8 steps ramp-up to set a csv file for the KKmoon Generator
built on Excel, setting the same over the specified rows
----- Rows ------
first -------- last --------- value (on column A)
0001 ------ 0256 -------- 0
0257 ------ 0512 -------- 0.142857
0513 ------ 0768 -------- 0.285714
0769 ------ 1024 -------- 0.428571
1025 ------ 1280 -------- 0.571429
1281 ------ 1536 ------- 0.714286
1537 ------ 1792 -------- 0.857143
1793 ------ 2048 -------- 1
[EDIT2] to (re)place the pictures along the post
rhb:
Thanks for posting that. While it is obvious how to do it if you read the Tek curve tracer documentation, lots of people overlook how simple it is once you have a good AWG and a scope.
Have fun!
Reg
Calvin:
Hi,
I´m still rolling the idea to increase collector signal and -power by simply adding a dc-amplifier.
One of those cheap chinese ebay offers should suffice, eyh?
Collector drive signal could be a rectified sine, same as in the Tek576
regards
Calvin
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