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Home > Standards > Resistance Decades > ZX74-77 Resistance Standard Decade

Resistance Decade Box.

Decade Resistance Boxes ZX Series.
ZX74E, ZX75E, ZX76E: Decade Resistance Boxes, accuracy 0.01% +0.002Ω at 20°C ±2°C
ZX77E: Decade Resistance Boxes accuracy 0.05%+0.002Ω at 20°C ±2°C

Standard Resistor Box

Model  Description 
ZX74 Resistance Decade Box

The ZX74 Series of Decade Resistance Boxes are very high accuracy and stable six-dial instruments.
There are 4 versions in the series with a maximum resistance of 1,111,111Ω.

The resistive elements are non-inductively wound on high quality formers using a resistance wire of specially
selected alloy. Each resistive element is heat treated and undergoes a controlled ageing process to produce
the very highest stability and also a low temperature coefficient.

Switches are of the highest quality with low pressure contacts for long life and reliability.
Each decade switch is manufactured using a fully enclosed construction for maintenance free operation.
ZX74 Series decade boxes are housed in attractive robust metal cases with adjustable feet and a retractable
carrying handle. The very popular ZX74 model has a lowest decade with steps of 1mΩ.
This is particularly useful for Resistance Thermometer Simulation and resistance bridge networks.
All models have an extra terminal connected to the electrostatic screen which may be required in AC.
bridge applications.

Accuracy:
ZX74E, ZX75E, ZX76E: (0.01% +0.002Ω) at 20°C ±2°C
ZX77E: (0.05%+0.002Ω) at 20°C ±2°C
RH: 45 - 75% and power consumption less than 0.05W.
Temp. coefficient: (-5 to +10)ppm/°C
Power dissipation: MAX 0.2W
Shipping: dimensions (mm): 435x136x110 weight (Kg): 4 

Models
Type  Decades  Total Resistance 
ZX74   6  1,111.210 
ZX75   6  11,111.1 
ZX76   6  111,111.0 
ZX77   6  1,111,110 
ZX83   6  11,111,110 
ZX84   6  111,111,100