This would have been a good day for you Tek 475 lovers; I saw at least three in good working order, ranging from about $50 up.
I'm betting all of these will need some power supply work, considering their age; but the fact that they are all operational is good.
Now the thing which I still can't believe; how much did this nice little stack of gear cost? Out the door with a complimentary cloth bag for carrying them, total cost $32.
Been playing with the Siglent SDM3055 DMM. I'm definitely liking it and still figuring out all it's functions. Per Tautechs recommendation it's firmware is updated to 1.01.01.19. BTW, the user manual is incorrect on the procedure for updating the firmware but I figured it out.
I've let it burn in for several days to shake out any issues and there's been none. For the big test. How accurate is it? Here's the results:
AD584 Primary SDM3055
2.50066V 2.5006V
4.99794V 4.9978V
7.50011V 7.4999V
9.99691V 9.9967V
AD584 Backup SDM3055
2.49937V 2.4993V
5.00030V 5.0001V
7.50042V 7.5002V
10.00096V 10.0007V
It's within spec and consistently 0.0001V – 0.0002V low. Anal me wishes there was a way to “tweak” the cal but apparently that ain't gonna happen and I can live with these results. So gonna continue to figure out it's many functions.
Been playing with the Siglent SDM3055 DMM. I'm definitely liking it and still figuring out all it's functions. Per Tautechs recommendation it's firmware is updated to 1.01.01.19. BTW, the user manual is incorrect on the procedure for updating the firmware but I figured it out.
I've let it burn in for several days to shake out any issues and there's been none. For the big test. How accurate is it? Here's the results:
AD584 Primary SDM3055
2.50066V 2.5006V
4.99794V 4.9978V
7.50011V 7.4999V
9.99691V 9.9967V
AD584 Backup SDM3055
2.49937V 2.4993V
5.00030V 5.0001V
7.50042V 7.5002V
10.00096V 10.0007V
It's within spec and consistently 0.0001V – 0.0002V low. Anal me wishes there was a way to “tweak” the cal but apparently that ain't gonna happen and I can live with these results. So gonna continue to figure out it's many functions.Are you sure tempco isn't causing the difference?
Solder-ily nice job mnem.
Granddad mode again, CJ and his mum and dad are here for the weekend.
Quite a little character.
Being a grand parent is fun. After you spoil them rotten you get to hand them back to the parents as a reminder of the things they did as a child to drive you nuts.
@GreggDunn : nice haul for the money. Can’t go wrong with that kit!
Wish me luck for tomorrow
Now the thing which I still can't believe; how much did this nice little stack of gear cost? Out the door with a complimentary cloth bag for carrying them, total cost $32.
Solder-ily nice job mnem.
Granddad mode again, CJ and his mum and dad are here for the weekend.
Quite a little character.
Being a grand parent is fun. After you spoil them rotten you get to hand them back to the parents as a reminder of the things they did as a child to drive you nuts.
Must be nice. Granddaughter lives with us, including her parents.
Now the thing which I still can't believe; how much did this nice little stack of gear cost? Out the door with a complimentary cloth bag for carrying them, total cost $32.
Now that's a good TEA time.
Watch this space.
This area to the right of the laptop is under utilized and in need of a makeover. Been thinking about renovations for quite a while and I've settled on what I want to do. I'm not going to reveal what that is right now as it may take months to implement it, or it might possibly not get done at all. You know how that goes. Sometimes you have big ideas but then you say screw it. Anyway, if I do go forward with my plans I will certainly post it. (I'll give one clue...it is TEA related).
Watch this space.
This area to the right of the laptop is under utilized and in need of a makeover. Been thinking about renovations for quite a while and I've settled on what I want to do. I'm not going to reveal what that is right now as it may take months to implement it, or it might possibly not get done at all. You know how that goes. Sometimes you have big ideas but then you say screw it. Anyway, if I do go forward with my plans I will certainly post it. (I'll give one clue...it is TEA related).
I agree... that area of alien verdant infestation neeeds to go... so unseemly in the manly space. However that delicious argent representation of a classic Pontiac Tempest seems perfectly placed, and must not leave. Perhaps a compromise wherein it resides atop a nearby speaker?
I see room therein for all manner of TEA-oid mischief... even more if you're willing to relocate all that pesky service documentation and all the at best tangentially relevant radio gear elsewhere so you can consolidate the entire space to workbench area.
mnem
Or you could just knock out the wall and back in a full rack unit, then drywall around it.
Watch this space.
This area to the right of the laptop is under utilized and in need of a makeover. Been thinking about renovations for quite a while and I've settled on what I want to do. I'm not going to reveal what that is right now as it may take months to implement it, or it might possibly not get done at all. You know how that goes. Sometimes you have big ideas but then you say screw it. Anyway, if I do go forward with my plans I will certainly post it. (I'll give one clue...it is TEA related).
I agree... that area of alien verdant infestation neeeds to go... so unseemly in the manly space. However that delicious argent representation of a classic Pontiac Tempest seems perfectly placed, and must not leave. Perhaps a compromise wherein it resides atop a nearby speaker?
I see room therein for all manner of TEA-oid mischief... even more if you're willing to relocate all that pesky service documentation and all the at best tangentially relevant radio gear elsewhere so you can consolidate the entire space to workbench area.
mnem
Or you could just knock out the wall and back in a full rack unit, then drywall around it.
The plant and documentation will move. The Pontiac GTO is safe. That Heathkit SW-7800 Receiver? I don't know what I'm going to do with it at this point. It has got to be the biggest piece of shit Heath ever produced. I've never been happy with the performance of that receiver. And it turns out the rest of the internet agrees. It's garbage. It may wind up in the TEA closet.
Can't knock out walls....don't think the landlord would like that.
You're all just going to have to be patient and wait and see. All in good time.
Now I'm going to go get some sleep.
One NiCd is well past its sell-by date and the battery voltage with power applied only totals 4.3VDC - not even 4VDC when running on batteries alone, which trips the LO BATT indication. I'm pretty sure this is not helping the meter's accuracy at all. I know I shouldn't power it up with the batteries out, so I'm pondering my options for additional testing.
One NiCd is well past its sell-by date and the battery voltage with power applied only totals 4.3VDC - not even 4VDC when running on batteries alone, which trips the LO BATT indication. I'm pretty sure this is not helping the meter's accuracy at all. I know I shouldn't power it up with the batteries out, so I'm pondering my options for additional testing.
It may be simplest to just replace the NiCd cells, depending on size, capacity and whether or not they are tagged. Much to my amazement, that turned out to be the case for my TDR.
Another alternative might be NiMH, but be careful with both the charging current (NiMH needs <C/20) and claimed capacity.