Products > Test Equipment
Yokogawa Bench Meters, Slim Pickings.
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Muttley Snickers:
Thanks very much enut11, it looks like you scored a keeper.. :-+ ..and the pictures showing the inside of the unit indicate a very nice and clean meter, not to mention bug free.. ;D

I've only had a brief look over the 7562 manual and did notice that it indicates that each mode can be independently adjusted which is very nice as opposed to running through an entire calibration sequence, which some of us are either not geared up for or confident enough to do, yours so far looks like it is spot on.

Was that 7562 manual suitable or are we still keeping an eye out for the dedicated manual ?.

Many thanks and well done... :-+

Muttley

enut11:
Thanks Muttley. I had a long look for the 7552 manual without luck. So far the 7562 manual has been extremely useful. Based on my experience so far I can recommend the 7552 DMM. It has a useful range of features, promises good accuracy and has a good clear display. I could not find any evidence of leaking caps on any of the boards despite its age (>20yrs?). Because it is not well known It can be bought for a discount compared to a HP, Fluke or Keithley. Someone asked if there was a way to switch a 110AC unit to 240AC internally. I will have a look at this next time I open the case.
BTW, thanks for starting this post as I found it while looking for a manual. Eevblog has been a great source of info for lots of electronic stuff that I am interested in.
enut11:

--- Quote from: deadlylover on November 08, 2015, 04:56:17 am ---
--- Quote from: crispy_tofu on November 08, 2015, 04:27:38 am ---Shame they don't have voltage selection switches, these look like quality meters...  :-//

--- End quote ---

Hmmm I might be confusing the models, but some of them have another hidden set of switches behind the sticker showing the selection of 230v/200v like on enut11's unit.

Maybe he can have a feel around and see if there's anything behind that sticker just to confirm. I guess we'll know for sure when he lifts up the skirt.

--- End quote ---

Hi nowlan, crispy-tofu and deadlylover. Had a look inside my 7552 and there is a switch behind the 230VAC/200VAC label which most likely selects 100VAC/115VAC operation. Also, the 7562 manual describes the process - see pic below.
crispy_tofu:
Ah okay, I stand corrected.  :-+ Thanks!
enut11:

--- Quote from: deadlylover on November 07, 2015, 12:52:47 pm ---Very nice, I'm looking forward to seeing what voltage reference they used inside.

I like that multidot display for the "V" symbol, reminds me of their arch enemy Advantest. Mine's hopelessly dim. =P

--- End quote ---

Hi deadlylover. Had a good look inside the 7552 at the chips trying to identify the voltage reference chip.

Main PCB chips
SL161525 (8 pin metal can)
LM339
6N137
9136?
TC4001
TC4049
TC4052
TC4053
74LS04N
74HC00
CA4558
OP27
LT055
AD707
A2004C uP?

Sub PCB
LM339
LF351
LF353
LT012
LT1055
AD707
4200?
C311C
NE5532

I suspect the the SL161525 may be the voltage reference chip but I cannot find any info on it. Equivalent to an LM369???

Anyone up to speed on reference chips?


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