Yokogawa DL1200A
Okay, as promised and even though it is getting late here (01:22 MEST),
here is the teardown and a little testing of the Yokogawa DL1200A.
First of all: I'm impressed. Why? Well, because of this:
This is the box. Looking suspiciously small and I'm fearing the worst.
Let's open the box and yes: no additional packaging material. Zero! None!
Here is what I've written to the seller and the answer (Google translator is your friend):
Hallo XXX,
das DL1200A ist heute angekommen, Danke Dir.
Allerdings muss ich sagen, dass ich enttäuscht bin über die Art und Weise, wie es verpackt war. Einfach so ein empfindliches Meßgerät in eine Schachtel zu packen, ohne Dämmmaterial, um es gegen Stöße etc. zu schützen, ist grob fahrläassig. :-( Auf die Schachtel zu schreiben "Vorsicht! Zerbrechlich!" reicht nicht und wird in der Regel ignoriert. Das Gerät konnte sich in der Schachtel auch frei bewegen, normalerweise ein Garant dafür, dass es in mehreren Teilen beim Empfänger ankommt.
Ich habe es getestet und es funktioniert. Allerdings ist dieser Umstand nur zwei Dingen zu verdanken: Glück und der Tatsache, dass die japanischen Ingenieure da ganze Arbeit geleistet haben.
Ich wollte eigentlich genau das vermeiden und die Tatsache, dass Du meine Bitte für eine gute Verpackung ignoriert hast, macht mich wütend und traurig zugleich.
Bitte, falls Du wieder so ein Gerät versenden solltest, verpacke es gut! Ausreichend große, stabile Schachtel, dick polstern und so in der Schachtel platzieren, dass es von ALLEN Seiten dick mit Polstermaterial umgeben ist UND es sich in der Schachtel nicht mehr bewegen kann.
Traurige Grüße,
BU508A
The answer:
Hallo BU508A, entschuldige bitte ich dachte die Verpackung wäre ok so. Ich merke mir das für das nächste Mal. Freut mich dass es trotzdem funktioniert hat.
Ist meiner Unkenntnis zu verdanken.
Trotzdem viel Spass damit.
Liebe Grüsse
XXX
First thing I did, I've shaked it a bit. Good. No rattling. The feet, plastics and connectors are looking okay.
Hope increases a bit. Here are the pictures from the outside of it.
Front, back and bottom:
Some details:
type label, BNC inputs, thingie, handle
Very impressive, this thing is build very sturdy. Good. Hope increases a bit more.
Let's open it and see, what's inside.
First, the electronics for the CRT. It is a bit dusty but besides that very clean. No rust.
HV area. I took those pictures to scare a bit bd139.
The CRT and some labels, including a date code. This DL1200A has been built in Jan. 1991, 30 years ago.
There are several boards for the digital part, pity, they are mostly hidden and I didn't want to take it apart further.
Top view of the PSU, very compact design:
But is it working?
Let's find out.
First boot and CH1 and CH2. Looks good! This thing has survived the trip from Munich to me without any damage so far!
Very impressive!
The display is very crisp and all the functions seems to work!
I've connected my R&S dual arb generator (type: ADS) to the scope and fooled around a little bit.
Signals are sine and triangle, 1kHz, 2Vpp. Sorry for the blurred pictures,
sometimes the cam did not focus on the display and I was too lazy to take new pictures.
I hope you've enjoyed this little teardown and testing.
I think, I've fallen in love with those Yokogawa scopes. Cute things, a bit unusual in their handling but not illogical.
But now it's bedtime, really tired at 02:14 MEST here ...
Well, at least he did write "be carefull" on the package.
Heads up for the UK boys at least, it seems this weekend there is another £1 max selling fee weekend, I have just received my offer.
Bored?
Want to fiddle around with some RF black magic?
Shahriar from The Signal Path will help you out.
Power Supply time this weekend
And a new 'Sleep-over' borrow from ELEshop.nl / Eleshop.eu
protect your bare feet!
protect your bare feet!
Haha this is all fortunately bagged and boxed already
protect your bare feet!
Haha this is all fortunately bagged and boxed already
Good luck. May dumb and/or untrustworthy people avoid your auctions.
Bored?
Want to fiddle around with some RF black magic?
Shahriar from The Signal Path will help you out.capt bullshot should know the answer to the viewers puzzle if he's played with his SVA enough.
And a new 'Sleep-over' borrow from ELEshop.nl / Eleshop.eu
Yes that's an explanation reserved for wives
If you have no capacitance meter a genuine DE-5000 is a good choice. If you already have a good LCR meter the ESR 70 is a good option.
If you have a good LCR meter why would you need a ESR70 ? smaller ? easier to manipulate and take less place on the bench ?To measure ESR
I said LCR meter not LCR ESR meter your other points are a good reasons too.
ESR is the same as the series resistance (Rs). Normally a good LCR meter can measure series resistance adequately.
From IET LCR primer (https://www.ietlabs.com/pdf/application_notes/030122%20IET%20LCR%20PRIMER%201st%20Edition.pdf)
I never heard of "LCR ESR meter", do you have a example?
Normally, modern LCR meter measure impedance and shouldn't have any problem giving you Rs (ESR). A lot of ESR meter actually estimate Rs using different techniques and that's why they can't measure anything else.
I suspect what he meant was a LCR/ESR meter; as in a single device which combines the two functions. These are common nowadays, they weren't always.
When ESR meters as commonly used in electronics repair were first devised, they showed two parameters: Capacitance and ESR. They worked on capacitors, period.
Some LCR Meters, particularly older laboratory units, use a substitution bridge to determine the value of the DUT and don't actually offer ESR or Tan δ parameters.
It is only later models which can use the magic of cheap microprocessors and multiple ADCs which can offer all the above in a single device, even giving all these parameters in one test.
Or is that not the question you were asking...?
mnem
In the early '50s, I was given Phenobarb, which may have worked, but gave me heart palpitations.
I suspect what he meant was a LCR/ESR meter; as in a single device which combines the two functions. These are common nowadays, they weren't always.
When ESR meters as commonly used in electronics repair were first devised, they showed two parameters: Capacitance and ESR. They worked on capacitors, period.
Some LCR Meters, particularly older laboratory units, use a substitution bridge to determine the value of the DUT and don't actually offer ESR or Tan δ parameters.
It is only later models which can use the magic of cheap microprocessors and multiple ADCs which can offer all the above in a single device, even giving all these parameters in one test.
Or is that not the question you were asking...?
mnem
It would be really surprising to find a LCR meter that is not able to measure Rs. Even if they have different name, ESR is equal to Rs. All LCR meters can measure Rs. Even the old one.
Personally, I think ESR meters are useless when you have a good LCR meter. Maybe ESR meters have better range ?
I'm not sure why people tend to believe ESR meters actually measure something that LCR meters can't. The LCR meter is the superior instrument, ESR meter only measure a subset (Rs and if you are lucky Cs) of what a LCR meter can do.