Re: I'm also looking for a scope but have some requirements
Looks like I'll be buying a Tek 475A (probes & manuals included)
calibrated and ready to use for $248
zeus
Member
Last Activity: 03-13-2008, 04:26 PM
Joined: 12-23-2007
Location: Here
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Re: Bob Parker's Blue ESR Meter Assembly & Comments
ROTFL!!! I think I found my long distance (Type A) twin. Looking at the pics,
I saw you did all the anal crap I did:
- Tolerance bands on resistors are all down and to the right.
- All transistors are straight as an arrow, and probably the same height.
- Caps are all facing in a way that you can read them.
- HERE's THE BIG ONE; going over to $hit Shack and buying dip sockets.
I love it!
The only thing I did different is cutting off the banana end and soldering...Leave a comment:
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Re: I'm also looking for a scope but have some requirements
New or used doesn't matter I have 1500 to spend. Everything you mentioned Starfury1,
I already know. But, I don't know what scopes out there have all the requirements I need.
Some new scopes don't even have a Z-axis input.
I was hoping to get a reply from someone who knows what BRAND & MODEL to buy that
doesn't have model specific flaws or failures but yet has the requirements I need in a scope.
I don't have the time to research tons of scopes to find what I need. I was hoping...Leave a comment:
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I'm also looking for a scope but have some requirements
I'm in the market for a good reliable scope but I have some basic requirements
for troubleshooting old x-y vector monitors and game boards. If you have a
good suggestion please include brand and model number. I have $1500 to send.
ATARI REQUIREMENTS:
- at least 50MHz
- dual trace
- 5mv per division or better
- vertical sensitivity (rise-time capability) of 5ns or less
- internal synchronization features
- an internal and external sync feature, along with delayed sweep
- and a Z-axis input
So, what...Last edited by zeus; 01-16-2008, 01:50 AM. -
Re: Yet another ESR meter!
I love my little Blu; it's measuring a 0.27ohm 1watt WW resistor, not bad for a 28 year old resistor.
There was one very small problem with the kit. In order to use those 4 pin headers to install the
two LED displays you had to solder the pin headers to the board and then solder the displays to
the pin headers, not an easy task. Instead, I just soldered the displays to the board, much, much
quicker.
This ESR meter kit is well worth the $79.99
...Leave a comment:
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Re: ESR, how low is too low?
Ok, so I will assume this cap is bad. I guess I'll be testing every old and new lytic cap that crosses
my path and log it's measurements to come up with some sort of average to compare to.
I received my 289FVF a week and a half ago, and I can't put it down (little kid in a candy store).
I did spend the extra $70 for the extra goodies just to see what the Fluke View software was like.
I must say the 289 is night and day compared to my 179. I now have some components that test ok,
that tested bad on the 179 do...Leave a comment:
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Re: ESR, how low is too low?
So, you're saying GP lytics don't need to be tested for ESR at all?
How do you properly test a GP lytic to see if it's good or bad then?...Last edited by zeus; 01-02-2008, 01:03 AM.Leave a comment:
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Re: ESR, how low is too low?
I understand that, I'm trying to learn when a GP cap has bad ESR numbers.
I need to compare good numbers with bad. I found a ELNA 47uF, 160v, 85c
lytic cap that seems to have an ESR number that is too low (0.19ohms)....Last edited by zeus; 01-02-2008, 12:48 AM.Leave a comment:
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Re: ESR, how low is too low?
PCBONEZ, I ohmed this ELNA cap and got 19.36 Mohms using a Fluke 289.
So its not shorted.Leave a comment:
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Re: ESR, how low is too low?
Correct PeteS, 85c lytics do not have specified ESR ratings. I got the 1.0 ohm number from a
chart on the web that said this chart was a "rough guide only". Considering ESR is a
rather important spec, Why manufactures don't put it on data sheets for all series
lytics I'll never know. I guess they want end users to reinvent the wheel every week.
The chart didn't say what freq the ratings were measured.
My meter only measures at 100KHz.
This cap does not seem to be shorted.
What...Leave a comment:
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ESR, how low is too low?
I got my ESR meter last Friday and have been comparing old lytics with new ones to get an idea on numbers.
I found a 27yr old ELNA 47uf, 160v, 85c, that measured 0.19 ohms and should be around 1.0 ohm.
Why is this lytic's ESR so low?
Is this considered a bad lytic? -
Re: Need help identifying 20yr old lytics
Excellent I'll check the low voltage side tonight, I know there're some lytics in that circuit.
I've got an ESR meter on the way and should be here tomorrow. I'm hoping this meter will
take the guesswork out of comparing old lytics with new ones.
Yes, the monitor is from a Lunar Lander I'm restoring (1979). Just need to get the game
board and monitor working. Right now I'm using an Asteroids game board to fix the monitor,
and then on to fixing the Lunar Lander game board. These old...Last edited by zeus; 12-27-2007, 12:19 PM.Leave a comment:
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Re: Need help identifying 20yr old lytics
I think you guys may have hit on something here. I've been fighting a ripple,
or shimmy problem on a WG V2000 19" vector monitor for months.
Check this out: (click on the pic)
[URL=http://s230.photobucket.com/albums/ee12/seedss/?action=view¤t=Ripple.flv][/URL]
Now, this ripple only happens on text, and only in the upper right corner of the
screen which is X+ and Y+ section of the monitor. Would low impedance lytics
solve this annoying problem?Re: NeedLast edited by zeus; 12-25-2007, 05:23 AM.Leave a comment:
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Re: Need help identifying 20yr old lytics
Actually, the service manual has that block listed as a doubler and yes,
it's old as dirt but works. If that doubler goes out, you can throw the
monitor way, the same goes for the flyback. As no replacements are made.
PeteS: So we've ruled out low ESR caps, what about hi-frequency ones.
This HV board has a Hartley oscillator circuit that operates at 25KHz.
Go easy on me with those acronyms, LOL, I don't know all the brand
names.
BTW,
What does...Leave a comment:
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Re: Need help identifying 20yr old lytics
I know some hi-freq caps are 85c, and 20 years ago some low esr caps may have been 85c also.
Just want to make sure exact series caps are used, these old vector monitors are very sensitive
to replacement components if their not the right ones.
BTW, what is IIRC?...Leave a comment:
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Need help identifying 20yr old lytics
I'm recapping an old HV power supply for a vector monitor. There are three lytics on this board, two are Rubycon and one is Elna. I'd like to identify what old series these caps are, (general purpose, low ESR, Hi Freq, etc.).
1st cap: Rubycon, baby blue w/ black text, 47uF/50v/85°c
Markings:
CE w
KR M02
85°c
2nd cap: Rubycon, baby blue w/ black text, 4.7uF/160v/85°c
Markings:
CE w
Ø 20
S.C.
85°c
3rd cap: ELNA, dark blue w/ white text, 470uF/50v/85°c
Markings:
CE 85°c...Last edited by zeus; 12-23-2007, 03:54 PM.
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