Author Topic: Yokogawa Bench Meters, Slim Pickings. (Read 23170 times)

enut11 · « **Reply #25 on:** November 14, 2015, 11:30:04 pm »

Hi All.
First of all I must say that I am very impressed with build quality, features and performance of the Yokogawa 7552 and can recommend it to anyone who wants an affordable bench meter. The internals of my unit are pristine with no evidence of the dreaded leaking electrolytic capacitors that seem to affect some other brands.

Delving into the innards and using the meter on a regular basis, I am still discovering features as I use it. While testing the AC ranges for functionality I found that I could quickly check the AC frequency by pressing Shift + AC V (also works for AC A). I don't have a spec for frequency response as the 7562 does not support this feature and I am currently relying on the 7562 manual as I have not been able to find a 7552 manual. The 7555 specs sheet states 100KHz so the 7552 is likely to be similar, so it is a low (audio?) frequency counter only.

radhaz · « **Reply #26 on:** November 15, 2015, 08:15:24 pm »

Have you seen this?

http://www20.tok2.com/home/daisuken/yokogawa7552.html

Muttley Snickers · « **Reply #27 on:** November 15, 2015, 09:41:12 pm »

Quote from: radhaz on November 15, 2015, 08:15:24 pm

Have you seen this?

http://www20.tok2.com/home/daisuken/yokogawa7552.html

I couldn't get that page to open, was this a link for the 7552 manual ?, what was on that page ?, Thanks.

radhaz · « **Reply #28 on:** November 15, 2015, 09:52:25 pm »

It's a Japanese page with specs and brochures for the 7552.

Muttley Snickers · « **Reply #29 on:** November 15, 2015, 09:59:19 pm »

Thanks very much, I will convert it to PDF later for future reference, here it is in MS Word, edit: PDF added

Nice Find..

enut11 · « **Reply #30 on:** November 16, 2015, 05:06:04 am »

Thanks radhaz and muttley. The 7552 spec sheet is very handy. It verifies the frequency limit of 100KHz.

I checked the display overshoot on DC V by applying a 12v signal repeatedly and could not detect any significant overshoot on both auto and manual ranges.

The firmware version for my 7552 is 2.02 rv at bootup.

Btw, tinhead has just responded with a 7552 manual amongst other info...

radhaz · « **Reply #31 on:** November 16, 2015, 07:08:11 am »

for those who are interested, yahoo auctions is the ebay of japan.
http://auctions.yahoo.co.jp/
here is the kanji for yokogawa:
??

crispy_tofu · « **Reply #32 on:** November 16, 2015, 07:46:21 am »

The kanji doesn't show up...

deadlylover · « **Reply #33 on:** November 16, 2015, 09:09:30 am »

Try this link instead.

enut11 · « **Reply #34 on:** November 16, 2015, 10:03:44 am »

Had a good look around. Lots of nice gear but nothing with a fixed price is cheap. Unsure how to bid for auction items...

deadlylover · « **Reply #35 on:** November 16, 2015, 10:15:59 am »

Quote from: enut11 on November 16, 2015, 10:03:44 am

Had a good look around. Lots of nice gear but nothing with a fixed price is cheap. Unsure how to bid for auction items...

You have to look for a proxy buying service in Japan, there are heaps out there on Google with different fees and what not. Look for one that can ship via UPS if you plan on importing lots of items in a combined package, they seem to be the most reasonable (EMS to Aus limit is ~20kg, and costs ~$300 for 20kg). Stuff seems cheap at first glance, but then there's the commission, domestic tax, domestic shipping, payment fees, paypal fees, packaging fees and finally international shipping....

Just as a rule of thumb for bench gear, expect to pay an extra of about ~$25 per kilo on top of the actual item cost itself. Most test equipment is sold as-is too, so it's a gamble just like on eBay.

It all adds up reaaaal fast.

Muttley Snickers · « **Reply #36 on:** November 16, 2015, 11:15:53 am »

That web site is a bit of a tease for some of us and when I first started looking around for info on the Yokogawa gear I came across these sites but had virtually no luck in properly translating them.

I couldn't find out what the Yokogawa equipment was worth when new but I would imagine that it was rather expensive and the reason I started the thread was to hopefully get an indication on how this gear is holding up and whether it was worth consideration, it appears that enut11 got a very nice unit but so far thats about all we have to go on.

One appealing feature for me on these meters is that the LED displays on them still look in very good order and I've been over dozens of pictures, I personally find the dim VFDs on some other brands a slightly dissuading factor when looking to purchase older equipment.

Muttley

tinhead · « **Reply #37 on:** November 16, 2015, 10:27:23 pm »

as i got asked for, here my collection of user manuals, service manuals and other things for some Yokogawa gears (755x, 756x, TC1xx, FG1x0, FG2/3xx)

http://1drv.ms/mylink if not working, send me PM

Afaik, the firmware 2.02 is the latest revision for 7551 and 7552 models, in case someone have newer version i would be happy to get a copy.

I'm looking as well for firmware (eprom dump) from 7561 and/or 7562 models.

enut11 · « **Reply #38 on:** November 16, 2015, 10:29:31 pm »

I agree. VFDs are nice when new but some fade quite badly with age. Old LCDs can also be bad news, especially if used under bright lights or sunlight. Replacements can be impossible to get or very expensive. Good old LEDs may not be as sexy but they seem to last and last.
enut11

radhaz · « **Reply #39 on:** November 17, 2015, 03:49:02 am »

I have an Advantech 6551T, with green LED 5.5 digit. I like it much better than my HP 3468B LCD display. It has some nice functions, and is built a lot like the Yokogawas pictured here. Sadly, there is very little in the way of service information like schematics.

enut11 · « **Reply #40 on:** November 17, 2015, 11:09:28 am »

Quote from: tinhead on November 16, 2015, 10:27:23 pm

as i got asked for, here my collection of user manuals, service manuals and other things for some Yokogawa gears (755x, 756x, TC1xx, FG1x0, FG2/3xx)

http://1drv.ms/1BUD6Nv

Afaik, the firmware 2.02 is the latest revision for 7551 and 7552 models, in case someone have newer version i would be happy to get a copy.

I'm looking as well for firmware (eprom dump) from 7561 and/or 7562 models.

...

Thanks very much tinhead. The 7552 User Manual is different in a lot of areas to the 7562 manual that I was using previously. Now makes setting up and calibrating my Yokogawa 7552 a lot easier.

enut11

tinhead · « **Reply #41 on:** November 17, 2015, 09:52:33 pm »

btw., when you wish to know more about GPIB commands on 7551/2 check the 7555 user manual as well.

enut11 · « **Reply #42 on:** November 18, 2015, 02:35:13 am »

Thanks for the tip tinhead.

Hi all
Just taken delivery of the DMM Check+ from the States. It is a precision voltage, current, resistance and frequency standard.

I will be testing the 7552 soon to see how it goes.

The Malone DMM Check+ is calibrated and guaranteed to hold the values for up to 6 months - see pix for more info.

enut11 · « **Reply #43 on:** November 19, 2015, 06:30:34 am »

Some preliminary checks on the Yokogawa 7552 DMM as received using the Malone calibrated DMM Check Plus. Both instruments were allowed to warm up for about 1/2 hr before testing at 23 deg C.

Ref 5.0000v DC reads 4.9995 on 7552 (1 year spec is 0.008%)
Ref 4.999v AC reads 5.0115 on 7552 (1 year spec is 0.2%)
Ref 1.0001 mA DC reads 1.00073 on 7552 (1 year spec is 0.07%)
Ref 1.000 mA AC reads 1.0001 on 7552 (1 year spec is 0.5%)
Ref 100.028 ohm reads 100.028 on 7552 (1 year spec is 0.018%)
Ref 999.81 ohm reads 999.75 on 7552 (1 year spec is 0.015%)
Ref 9.9977Kohm reads 9.9964K on 7552 (1 year spec is 0.015%)
Ref 100.085 Kohm reads 100.078K on 7552 (1 year spec is 0.016%)

These numbers suggest that the 7552 is working well and generally within spec so I am happy to use it as-is.

nowlan · « **Reply #44 on:** February 18, 2016, 11:53:04 am »

I bought a 7555 from yahoo auctions via shipping agent. I had it sent via boat to see if they could handle larger items via sea freight etc. I was in no real hurry, but took much longer than expected.

I had hoped to do voltage conversion to 220v easily, but upon opening it up, is just a single transformer attached to side. Different from the 7552 photos earlier. I figured it would be similar to the other model which had hidden voltage selection. I do have a step down, I just need to find a US lead.

Managed to power it up at school, but didnt have means to test it easily. Some other time.

Muttley Snickers · « **Reply #45 on:** February 18, 2016, 10:52:48 pm »

That's a bugger about the mains supply on the 7555, it is noted in the manual in regards to the model prefix numbers and as we have now found out something to watch out for whereas some of the other models noted have selectable universal input voltage.

A link to the user manual page. it's on page 7 for the 7555.

http://tmi.yokogawa.com/au/technical-library/instruction-manuals/

A picture from the manual of the model codes and the rear of the unit.

enut11 · « **Reply #46 on:** February 20, 2016, 09:47:10 pm »

That's a good looking meter! Gone is the odd angled input panel of the 7552. I like the large easy to read button labels. Looks like Yokogawa dropped the option of multi voltage operation on this series. I hope you get good use out of it. I love my 7552. It is an accurate and versatile meter. Do you mind sharing what you paid for the 7555?

nowlan · « **Reply #47 on:** February 24, 2016, 07:04:45 am »

I paid around 8050 yen ($99au), plus shipping cost me around $180 all in. I think exchange rate may have changed since last year.

The meter appears to work via step down. However throws an error indicating lithium battery failed. Looking into replacing that this afternoon.
Also on 4 wire mode, it shows overload. Possibly failed relay?

http://www.importmonster.com.au/yahoo?cat=0&term=yokogawa

nowlan · « **Reply #48 on:** February 24, 2016, 07:08:35 am »

Some internal pics for you.

maxwell3e10 · « **Reply #49 on:** February 21, 2022, 03:36:10 am »

I just came across an Omega 7563 digital thermometer, which is a rebranded Yokogawa 7563. It is similar to 6-1/2 digit 7561 and 7562, except replacing current and AC ranges with thermocouple and RTD. The nicest feature is a thermally isolated enclosure in the back for connection of thermocouple with reference junction compensation.

The DC voltmeter is surprisingly accurate, within a few ppm as far as I can measure. It is also quiet for a 6-1/2 digit meter, with the last digit rarely changing. Another nice feature is high input impedance up to 20 V range. One limitation is that thermocouple temperature is only displayed with 0.1 degree resolution, while RTD is displayed with 0.01 degree resolution, they could have added one more digit.

Yokogawa 7563 was only discontinued in 2017, but my unit was made in 1992. It seems to use the same voltage reference SL161525 as the 5-1/2 digit meters. It was manufactured by National Semiconductor, but I also couldn't find any info, perhaps a custom part made for Yokogawa?


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Author Topic: Yokogawa Bench Meters, Slim Pickings. (Read 23170 times)

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