MARCONI TF868 LCR BRIDGE, 1950's

A bridge for the measurement of, L= Inductors C= Capacitors & R= Resistances. A Bridge is a circuit of 3 Known values connected in a square configuration with the last portion the fourth for the unknown component, when the current across the bridge is at null or balanced the value of the unknown component is the same as its opposite counterpart.
Ranges:
L - 1 H to 100 Henrys
C - 1 pF to 100 uF
R - 0.1 Ohms to 100 Megohms
The test terminals are located on top of the instrument; the flat top provides a useful insulated platform for supporting the component to be tested. This also has printed basic instructions for use.

Donated by Frank Ibrahim

Your comments:

• When I worked in a 6th form college in the early 1990s I found one of these in a "junk room". It did work, but it certainly helped a lot if you knew the answer in advance! If you just connected up a random component you could get several nulls with hugely differing values.
  .......... Richard Mekka, Reading Berks, 10th of September 2012
  
  

A1489