Could someone please explain how one does put the values gathered with the EXER 02 routine into a BIN file?
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Any explanations, pointers, or even links to other already existing clear explanations for a newbie in this procedure will be much appreciated.
MarkL:
OK I started trying some things on the Hex Editor program and found that by changing the bytes per row from 16 to 10 (DOH) it will give me the correct row length that matches your example. I still get the four zeros in front of the 4 digit address, I assume this the usual way to look at the addresses and just ignore the leading zeros?
Could you please check the updated attached image and let me know if this would be correct in accordance to your example from your post above?
Thanks again.
One last question if you don't mind, when you refer to a line by labeling it as "0x1E00", what is the meaning of the "x" in it? Is this a common convention just to save not having to write it with all the leading zeros as in 00001E00, or does it have another meaning?
MarK, thanks very much for the template and additional clarification. I will work on rewriting my own Exer02 data into it. That was very helpful. Maybe I could even post my finished BIN file and if someone out here in the US with a programmer would be willing to write the data for me into a fresh DS1225AD-150 and mail it to me to FL zip 33152, I would be more than willing to pay for the efforts and cost of shipping. That way once I pull my original NVRAM and install a socket I could compare them and verify that it actually works to copy the exer02 values into a chip and put to rest that this might not be feasible as some members of the TekIO group stated in older messages I found. Or maybe in the end they will be proven right, but at least we will know.
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My Tek 2445B developed an interesting belly dance at first power up when cold. I think it is the capacitors on the main board. What do you masters think? It stabilises after 2 - 3 minutes and it is stable after that.
I tried to remove two of the knobs from the front panel and both broke, that's how brittle they are. Without removing those knobs there's no way to get to the main board. Anyone has a set of brightness, focus, etc knobs?
As requested here is an alternate procedure for calibrating the Counter/Trigger option. First, here is the copy of the cal procedure from the 2465 Options Service Manual. I assume the procedure is the same or similar for the 2465A/B.
The alternate procedure was from a gray beard on the Yahoo Tek Group who's name I forget and I take no credit for developing this procedure. But I can tell you from experience that it does work. You can use a function generator, oscilloscope calibrator, or home made pulser with the following requirements:
Square wave must be exactly 1 MHz.
Rise time of 1ns or less.
0.8 to 1 volt peak to peak.
Preferably as close to 50% duty cycle as possible but not absolutely necessary.
Must not have an either positive or negative offset. In other words, must be equally above and below 0 (GND) centerline. See first trace example. I have a Heath IG-4244 Oscilloscope Calibrator which meets all the requirements except it has a fixed negative offset as shown. If your signal source has an adjustable offset set it for approx .4V to .5V p-p above and below centerline (.8V to 1 V p-p total). Then set up your scope as per the cal instructions and proceed right to step F and do the cal. As long as your source is exactly 1 MHz it should work. If you have an offset issue see next step.
Negative offset:
What you'll need:
BNC âTâ connector.
6dB inline attenuator.
DC supply that goes down to 0 volts.
50 ohm coax.
Connect the signal source to the left. Connect the power supply to the attenuator. If your source is a negative offset connect positive to center pin. If the source is a positive offset connect negative to the center pin. Slowly increase the voltage until you obtain a waveform similar to the 2nd pix. .8 volt - 1 volt p-p equal to centerline. Then proceed to step F and do the cal. It should take. If not go back and check your setup.
My Tek 2445B developed an interesting belly dance at first power up when cold. I think it is the capacitors on the main board. What do you masters think? It stabilises after 2 - 3 minutes and it is stable after that.
I tried to remove two of the knobs from the front panel and both broke, that's how brittle they are. Without removing those knobs there's no way to get to the main board. Anyone has a set of brightness, focus, etc knobs?
Agree with tautech. Try cleaning the horizontal position pot.
Knobs....mnementh had a spare focus knob for my 2465. He may have some additional. PM him and make sure you tell him I sent you.
If he doesn't, Google is your friend. There are multiple sites selling Tek parts. I'm sure you can find them.
Next step then is to monitor the supply voltages at J119 on the main board and see if one of them is bouncing around. And with that many hours have the Inverter and Regulator boards ever been recapped? If not I highly recommend it be done.
Maybe the picture below will clarify some things...
Next step then is to monitor the supply voltages at J119 on the main board and see if one of them is bouncing around. And with that many hours have the Inverter and Regulator boards ever been recapped? If not I highly recommend it be done.
I recapped the power supply few years ago with good Nichicon PW series caps.
Glad it worked out for you!
If your goal is to prove that writing the EXER 02 values into the NVRAM works, that's already been verified.
There have been multiple conversations about it on TekScopes groups.io. Which one are you referring to? The last one I recall was the thread "tektronics 2465b 400mhz nvram battery info" where someone verified it with a 2467B in April.
Although I didn't mention it in a post a couple of weeks ago (reply #1182), I also verified that both the EXER 02 and the GPIB dump of the cal data was an exact copy of what's in the NVRAM on a 2445A. But I didn't bother mentioning it because it had been done before.
It's also been verified on a 2465, although that scope is a little different since it doesn't use a Dallas NVRAM.
So, we have all the versions covered for this series (A, B, and plain).
More verification is always nice, but it may not be worth the extra hassle if you don't already have a programmer or other equipment to do it.
That being said and you still want to experiment, I'm willing to drop your BIN data in a fresh DS1225AD-150 for you for free, if you want to send me the chip and a self-addressed, pre-paid return envelope. PM me if you want to set this up.
I tried to remove two of the knobs from the front panel and both broke, that's how brittle they are. Without removing those knobs there's no way to get to the main board. Anyone has a set of brightness, focus, etc knobs?
Maybe the picture below will clarify some things...
Wow, 41K plus hours of operation? Have you owned the scope since new or for a long time? Looks like during its life it might not have been officially recalibrated either, at least not at an accredited lab. The tech that performs the cal is supposed to also reset this counter after each calibration, so the next tech guy that has to deal with the instrument will know the elapsed time. But if just left to run it also can give a ballpark idea of the usage, but then again, it may have more than 41K hours on the clock, with one or more resets along the way.
Are you sure that counter is resettable? It is the ON counter and probably it is stored in the same infamous NVRAM that I replaced this summer.
Next step then is to monitor the supply voltages at J119 on the main board and see if one of them is bouncing around. And with that many hours have the Inverter and Regulator boards ever been recapped? If not I highly recommend it be done.
I recapped the power supply few years ago with good Nichicon PW series caps.
OK, but I would still monitor the PSU voltages at initial power up and see if something is amiss. Rule that out first before digging into it further.