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Old 10th Jul 2018, 1:12 am   #1
Radio1950
Hexode
 
Join Date: Apr 2017
Location: Buderim, Queensland, Australia.
Posts: 428
Default Metrix 477 Multimeter, French, 1960s, Notes and Info

Metrix 477 Multimeter, French, 1960s.

This is an exceptional multimeter, and I have been using it constantly since about 1985.
It complements a DVM nicely.

Accurate, robust, versatile, absolutely reliable, easy to read, overload protected, good range steps, well made.

I have never had a fault with the meter.
The only small negative effect is that the needle balance is slightly different when used in horizontal and vertical modes.

The Metrix is perhaps not quite as rugged in the field as an AVO Mk8.

They were supplied bundled with a French AME Conventional VOR for aeronautical navigation in Australia, along with Ferisol VTVM and CRC oscilloscope, fabrique en France, naturellement.
We had about 25 of these AME VORs, with mechanical antenna goniometers, and two QB3-300 valves in the RF PA, idling along to give a nominal 100W output at 114-118 MHz.

I have two of these Metrix meters, bought for $1 each on AME demolition (replaced by Australian AWA CVOR).
One of my meters was from Burragorang VOR in Victoria, which is evident by the aviation acronym “BGG” on page 1 of the Service Manual.


The Metrix uses two batteries for ohms, a “C” cell and a 15 volt Eveready 411 for high ohms.
As the 411 is hard to obtain and expensive now, though still available in modified form, I use a Varta V74/PX photo battery with side packing.
I noticed that when I was preparing this, the Varta V74 in my bench meter is marked Nov 2010, and still tests OK, and with no evidence of leakage. In these situations, I normally wrap the battery in a small plastic reseal packet, rollup the unit and cut tiny “contact” holes in the plastic. I use a quick wipe on the meter battery contacts with some lanolin spray. This all assists in containing the effects of a possible battery leak.

Another mod I have included is to replace the Ohms Zero pot with a multiturn type for easier use, but retaining the original pot as a heritage part.

I cannot speak too highly of this meter.

Some info which might be useful for others.
Operator Manual, French
Service Manual, English
Photos
The PDFs have been much reduced in size for these posts, but are readable.
Attached Thumbnails
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Attached Files
File Type: pdf Metrix 477 Multimeter, 1960s, English, 1.6Mbs, ex AUS.pdf (1.57 MB, 90 views)
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