Manufacture: Yokogawa Product Description: Model 2768 is a Precision bridge used for the exact determination of resistance in the 100 m Ohms to the 110M Ohms Range with an accuracy of 0.01 to 0.05%. Since this instrument includes a high-sensitivity transistorized galvanometer and bridge power source, no auxiliary device is needed.
+-0.01% Accuracy
Superior Resistor Element
Minimized contact resistance
Guarding and shielding
Stable Operation
Heat-insulated pushbutton Keys
Specifications:
Measuring Arm 0 to 11, 111 Ohms adjustable in 0.1 Ohms steps, (consists of five decades; 1,000 Ohms x 10 + 100 Ohms x 10 Ohms x 10 + 1 Ohms x 10 + 0.1 Ohms x 10)
Multiplier x 100m Ohms, x 1 Ohms, x 10 Ohms, x100 Ohms, x1k Ohms, x 10k Ohms, x100k Ohms, x1M Ohms, and x10M Ohms
Accuracy (at 23+-2 degrees, less then 75%) x 100m Ohms range.. +-0.5m Ohms, x 1 Ohms range... (+-0.02% of setting +0.5m Ohms) x 10 Ohms range, x 100k Ohms & 1M Ohms ranges... +-0.02% of setting x100 Ohms x 1k Ohms & x 10k Ohms ranges... +-0.01% of setting x10M Ohms range... +-0.05% of setting
Maximum Allowable Input 0.2W continuously for ratio arm, 0.2W continuously per element of Measuring arms
Galvanometer (built-in) Max sensitivity... approx. 10microV/div. (provided with a sensitivity adjuster)
Galvanometer Battery Single 9V battery (JIS 6F22 or equivalent)
Galvanometer Battery life Approx. 300 Hours
Insulation Resistance More then 1000 Ohms at 250V DC at ambient Humidity of less then 75% between electric circuit and case
Dielectric Strength 500V AC for one minute between electric circuit and case
Bridge power source (built-in) Power source range 1.5/3/6/15V selectable Power source battery four 1.5V batteries (JIS R20P, ANSI D, Mono 1.5V or equivalent) and a single 9V battery (JIS 6F22, ANSI 6F22, Energieblock 9V or equivalent)
Case Grey metal Case, with plastic feet and carrying handles
 "276800 Precision Wheatstone BridgeProduct Obsolete")