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ZX Series

ZX74 Series
 
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 ZX83 series adds another two Decade Boxes that extend the resistance range to 111,111,100Ω.
 
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. These decade boxes are housed in attractive robust metal cases with 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.
 
 
ZX90 Series
 
The ZX90 Series of Decade Resistance Boxes comprise of 10 instruments to cover a resistance range of up to 1,111,111Ω with instruments available in 4, 5, 6 and 7 Decades. Whilst they are low cost these instruments are of high quality and feature precision low contact resistance switches.
 
The resistive elements are made of enamelled manganin wire which is non-inductively wound onto high quality formers. Each resistive element is heat treated and undergoes a controlled ageing process to produce the very highest stability and to achieve low temperature coefficient. The instruments are housed in an attractive metal case which is both robust and dust proof.
ZX Series

ZX74 Series Specifications

Basic Accuracy:
  1. ZX74, ZX75, ZX76: (0.01% +0.002Ω) at 20ºC ±2ºC
  2. ZX77, ZX83, ZX84: (0.05%+0.002Ω) at 20ºC ±2ºC
  3. RH: < 75% non-condensing
  4. Insulation Resistance: >1000MΩ at 1000V
  5. Shipping: Dimensions: 435 x 136 x 110mm
  6. Weight: 4kg
 
ZX74 Series Resistance
Type Total
Resistance
Ω
Dials Available (NA = not available)
X10MΩ X1MΩ X100kΩ X10kΩ X1kΩ X100Ω X10Ω X1 X0.1Ω X0.01Ω X0.001Ω
ZX74 1,111.210           ±0.01% ±0.01% ±0.05% ±0.1% ±2% ±5%
ZX75 11,111.1         ±0.01% ±0.01% ±0.02% ±0.05% ±0.5% ±5%  
ZX76 111,111.0       ±0.01% ±0.01% ±0.01% ±0.02% ±0.1% ±1%    
ZX77 1,111,110     ±0.05% ±0.05% ±0.05% ±0.05% ±0.1% ±1%      
ZX83 11,111,110   ±0.05% ±0.05% ±0.05% ±0.05% ±0.05% ±0.05%        
ZX84 111,111,100 ±0.1% ±0.05% ±0.05% ±0.05% ±0.05% ±0.05%          

ZX90 Series Resistance

Type Number
of
Decades
Total
Resistance
( Ω )
Accuracy
Range Switching
Dimensions
(mm)
(unpacked)
Weight
(kg)
x105 x104 x103 x100 x10 x1 x0.1 x0.01
ZX90 4 111.1         ±0.1% ±0.5% ±2% ±5% 200x95x94 0.85
ZX91 4 11,110.0     ±0.1% ±0.1% ±0.1% ±0.5%     200x95x94 0.85
ZX92 5 1,111.1       ±0.1% ±0.1% ±0.5% ±2% ±5% 242x95x94 1.0
ZX93 5 11,111.0     ±0.1% ±0.1% ±0.1% ±0.5% ±2%   242x95x94 1.0
ZX94 5 111,110.0   ±0.1% ±0.1% ±0.1% ±0.1% ±0.5%     242x95x94 1.1
ZX95 6 11,111.1     ±0.1% ±0.1% ±0.1% ±0.5% ±2% ±5% 284x95x94 1.15
ZX96 6 111,111.0   ±0.1% ±0.1% ±0.1% ±0.1% ±0.5% ±2%   284x95x94 1.25
ZX97 6 1,111,110.0 ±0.2% ±0.1% ±0.1% ±0.1% ±0.1% ±0.5%     284x95x94 1.25
ZX98 7 111,111.1   ±0.1% ±0.1% ±0.1% ±0.1% ±0.5% ±2% ±5% 327x95x94 1.35
ZX99 7 1,111,111.0 ±0.2% ±0.1% ±0.1% ±0.1% ±0.1% ±0.5% ±2%   327x95x94 1.35