Descripción

Model 2768 is a Precision bridge used for the exact determination of resistance in the 100 M&Omega, to the 110M&Omega, 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 required. Superior resistor aliment Minimized contact resistance Guarding and shielding Materials of high insulation resistance and low absorption are employed. Guard circuits are provided to insure stable operation even In highly humid atmospheres. The instrument is housed in a {grey} metal case to assure -to operator of excellent shielding. Heat-insulated pushbutton keys If the operator's body temperature were carried to the galvanometer sensitivity control keys, a temperature difference would arise at the contact point and produce thermal EMF resulting in measurement error. To eliminate this effect, the pushbutton keys for the galvanometer sensitivity control are heat-insulated with phenol resin.
Specifications
Dimensions 497(W)?316(H)?140(D)mm, excluding protrusions 19.57 ? 12.44 ? 5.51 in.
Weight Approx. 9.6kg 21.2 lbs
Measuring Method Null method (in-line readout).
Measuring Arm 0 to 11, 111&Omega, adjustable in 0.1&Omega, steps, (consists of five decades, 1,000&Omega, x 10 + 100&Omega, x 10&Omega, x 10 + 1&Omega, x 10 + 0.1&Omega, x 10)
Multiplier x 100m&Omega,, x 1&Omega,, x 10&Omega,, x100&Omega,, x1k&Omega,, x 10k&Omega,, x100k&Omega,, x1M&Omega,, and x10M&Omega,
Accuracy (at 23±2°, less then 75%) x 100m&Omega, range ±0.5m&Omega,, x 1&Omega, range (±0.02% of setting +0.5m&Omega,) x 10&Omega, range, x 100k&Omega, & 1M&Omega, ranges ±0.02% of setting x100&Omega, x 1k&Omega, & x 10k&Omega, ranges &
Maximum Allowable Input 0.2W continuously for ratio arm, 0.2W continuously per element of Measuring arms
Insulation Resistance More then 1000M&Omega, 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
Galvanometer (Built-In) Max sensitivity approx. 10µ,V/div. (provided with a sensitivity adjuster)
Galvanometer Power Source Single 9V battery (JIS 6F22 or equivalent)
Galvanometer Battery Life Approx. 300 Hours
Case Grey metal Case, with plastic feet and carrying handles
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)
Measuring Range
Range Measuring Range Min Division
x 100 M&Omega, 0.10000 to 1.11110 &Omega, 10 &mu,&Omega,
x 1 &Omega, 1.0000 to 11.1110 &Omega, 0.1 m&Omega,
x 10 &Omega, 10.000 to 111.110 &Omega, 1 m&Omega,
x 100 &Omega, 100.00 to 1111.10 &Omega, 10 m&Omega,
x 1 k&Omega, 1.0000 to 11.1110 k&Omega, 0.1 &Omega,
x 10 k&Omega, 10.000 to 111.110 k&Omega, 1 &Omega,
x 100 k&Omega, 100.00 to 1111.10 k&Omega, 10 &Omega,
x 1 M&Omega, 1.0000 to 11.1110 k&Omega, 100 &Omega,
x 10 M&Omega, 10.000 to 111.110 k&Omega, 1 k&Omega,
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