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I saw a unit on ebay UK described as an 'S.J.Electronics Universal Electronics System' selling on a 'buy it now' of GBP50 with free postage. The description peaked my interest and after a quick look, GBP50 was winging its way to the seller The unit is in fact a Metex combined test instrument system and these were popular a few years ago and found homes in schools, colleges and home workshops.

They were not a cheap purchase at around $1000 but they offered the buyer an 'all in one' test equipment solution for the bench. Specifications were nothing amazing. You got four decent quality instruments in a single box. The unit provides a 250MHz frequency counter, 2MHz function generator, Multimeter with Capacitance + RS232 logging capability and finally a PSU that can supply 0-30V @2A, 5V@2A, 15V @ 1A. The frequency counter also provides an accurate display of the function generator frequency if required.

All this for GBP50.was it money well spent.let us see what is inside the big box Pictures attached. Its actually a very well constructed unit and performs to a decent standard. I have not done full calibration checks but all components appear accurate to hobbyist standards at least. I liked what I saw and decided to use the unit as a relatively compact multi instrument for use in the house when I just want to do some quick checks on a piece of kit. The seller turned out to be a recycling specialist who is located only 2 miles from my home.I popped down there today and bought another two of these units for friends who like the design. I attach the similar Metex 9160 model that is the revised version with an improved frequency counter & function generator.

The schematics for the similar 9150 are also attached. So was it worth GBP50. I believe so Aurora. I've used the similar MS9160.

One thing I hated was the loud AC fan, this unit appears to be fanless. Power supply was OK, though not terribly stable. Frequency counter was not bad for its price. Amplitude of the function generator varied a lot with frequency.

The manual actually hints at this. Square and triangular wave were a joke near its max frequency (though the specs claim it can do all up to 10 MHz). I felt like they pushed the bandwidth of the function gen too far beyond the limits of the original design. I considered that it may need adjustment, but I never found instructions or a description of all the trimmers.

DMM was a horrible piece of crap that would take seconds to respond (continuity test was absolutely useless) and was battery powered (too lazy to provide a proper isolated power supply?) and used a standard LCD, which defeated most of the point of a bench meter. The 'advanced' features like min/max, data hold or range hold were infuriating to use, requiring too many button presses (something like 6x function, then set just to enable range hold). Build quality was quite good except some bodge jobs on the DMM. Not a bad buy for £50 I guess, the power supply alone should be worth that. Hi alm, As you say, these units are a compromise and the specs will not set the world on fire. I would never have bought one new as I found better individual pieces of equipment on the new or used marketplace that met my needs for less money. The unit appealed at GBP50 and the fact that it was a relatively tidy 'all-in-one' package appealed for some strange reason.

The build quality in my unit looks decent enough but I note your comments regarding the multimeter. If it doesn't fit my needs, it will be going to a new home. These things would be great for students or youngsters starting out in electronics.GBP50 does not go far these days. If anyone wants a unit like this, here is the auction detail and you can contact the seller direct. He does have more in stock but I have not seen their condition so check first. Mine is in great condition though.

Auction: GBP50 with free delivery and these things weigh about 10kg! Sorry for digging the old thread. I bought the same unit for the same seller on ebay uk.