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Yokogawa Bench Meters, Slim Pickings.

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enut11:

--- 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.

--- End quote ---
...

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

enut11:
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:
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:
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.

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