old ohmmeter repair/rebuild - need help from German readers

[Prime73]

I've came across this german made device which I think is an ohmmetter (see pictures below). I plan to make an attempt rebuilding and restoring it to its "former glory", unfortunately I don't speak German. I would really appreciate if someone could translate the manual from the back side of the device. Maybe someone knows what this device is and has any extra info, schematics, etc?
Here is the text:

Gleichstrommessung.
A) Mit eingebauter Batterie
X-Widerstand anschließen, Meßbereich 10 stöpseln, Taste drücken
Ausschlag links - Skalenscheibe recht drehen
Ausschlag rechts - Skalenscheibe links drehen
Meßbereich ändern bis Nullstellung erreicht
Abgelesenen Wert mit Meßbereichfaktor multiplizieren
B) Mit 60 Volt Anodenbetterie
Meßbereich 1000 stöpseln, Klappdeckel öffnen, eingebaute Batterie gegen Anodenbetterie austauschen

Wechselstrommessung
Zusatzkasten und Kopfhörer anstecken, Tonminimum einstellen wie bei A)

Betterieersatz.
Klappdeckel öffnen, Anschlußlaschen nach Skizze biegen und festziehen.

[Maxlor]

DC measurement.
A) with fitted battery.
connect X-resistor and set range 10, press button.
Deflection to the left - rotate scale disc to the right.
Deflection to the right - rotate scale disc to the left.
Change the range until the null position has been reached.
Multiply the indicated value with the range factor.
B) With 60V anode battery
set range 1000, open the cover and replace the fitted battery with an anode battery

AC current measurement
Add extension box and headphones, set tone minimum like in A)

Battery replacement
open cover, bend and tighten terminals as in the drawing.

Hope this helps, the german text is rather brief and not terribly clear.

[RobertoLG]

yep, seems correct, nice oldie

[babysitter]

About what it is: It looks very,very Wheatstone-Bridgey to me.
That means the potentiometer is part of such a bridge and the device under test also, you turn the potentiometer until the bridge is balanced, resulting in a zero reading on the meter.

Case and text style make me considering Hartmann & Braun as primary suspected manufacturer, Siemens as secondary. Look at relevant websites if you can find a picture.

You can supply a external voltage to the battery clips for testing.
First, power it on and see if you can get the meter to hit both limits, should be very easy.
Keep testing times short - test currents might be high.
Switch off if the meter hits the edge, turn the poti "cold" and measure again.

[Prime73]

thank you all for the info. Are there any diy techniques to restore these aluminium plates with instructions? What process was used to print the text on aluminium in the first place?

[babysitter]

Personally, I would leave the plate exactly like it is in this case. If you real want to pop the rivets and install your own personal localized plate, drill or screw them out, and get a motor-maker make you a new one. But really, dont do it.

Any success with testing yet?

[babysitter]

I found a lead which one you might have:


http://www.historische-messtechnik.de/passive-messgeraete/widerstand/kleine-messbruecken/ms-ia-86.php