ZX Series
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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.

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ZX74 Series

ZX74
Total Resistance: 1,111.210 Ω
Available Dials: X100Ω ±0.01%, X10Ω ±0.01%, X1Ω ±0.05%, X0.1Ω ±0.1%, X0.01Ω ±2%, X0.001Ω ±5%

ZX75
Total Resistance: 11,111.1 Ω
Available Dials: X1kΩ ±0.01%, X100Ω ±0.01%, X10Ω ±0.02%, X1Ω ±0.05%, X0.1Ω ±0.5%, X0.01Ω ±5%

ZX76
Total Resistance: 111,111.0 Ω
Available Dials: X10kΩ ±0.01%, X1kΩ ±0.01%, X100Ω ±0.01%, X10Ω ±0.02%, X1Ω ±0.1%, X0.1Ω ±1%

ZX77
Total Resistance: 1,111,110 Ω
Available Dials: X100kΩ ±0.05%, X10kΩ ±0.05%, X1kΩ ±0.05%, X100Ω ±0.05%, X10Ω ±0.1%, X1Ω ±1%

ZX83
Total Resistance: 11,111,110 Ω
Available Dials: X1MΩ ±0.05%, X100kΩ ±0.05%, X10kΩ ±0.05%, X1kΩ ±0.05%, X100Ω ±0.05%, X10Ω ±0.05%

ZX84
Total Resistance: 111,111,100 Ω
Available Dials: X10MΩ ±0.1%, X1MΩ ±0.05%, X100kΩ ±0.05%, X10kΩ ±0.05%, X1kΩ ±0.05%, X100Ω ±0.05%

ZX90 Series

ZX90
Decades: 4
Total Resistance: 111.1 Ω
Accuracy: X1Ω ±0.1%, X0.1Ω ±0.5%, X0.01Ω ±2%, X0.001Ω ±5%
Dimensions: 200 × 95 × 94 mm
Weight: 0.85 kg

ZX91
Decades: 4
Total Resistance: 11,110.0 Ω
Accuracy: X10Ω ±0.1%, X1Ω ±0.1%, X0.1Ω ±0.1%, X0.01Ω ±0.5%
Dimensions: 200 × 95 × 94 mm
Weight: 0.85 kg

ZX92
Decades: 5
Total Resistance: 1,111.1 Ω
Accuracy: X1Ω ±0.1%, X0.1Ω ±0.1%, X0.01Ω ±0.5%, X0.001Ω ±2%, X0.0001Ω ±5%
Dimensions: 242 × 95 × 94 mm
Weight: 1.0 kg

ZX93
Decades: 5
Total Resistance: 11,111.0 Ω
Accuracy: X10Ω ±0.1%, X1Ω ±0.1%, X0.1Ω ±0.1%, X0.01Ω ±0.5%, X0.001Ω ±2%
Dimensions: 242 × 95 × 94 mm
Weight: 1.0 kg

ZX94
Decades: 5
Total Resistance: 111,110.0 Ω
Accuracy: X100Ω ±0.1%, X10Ω ±0.1%, X1Ω ±0.1%, X0.1Ω ±0.1%, X0.01Ω ±0.5%
Dimensions: 242 × 95 × 94 mm
Weight: 1.1 kg

ZX95
Decades: 6
Total Resistance: 11,111.1 Ω
Accuracy: X10Ω ±0.1%, X1Ω ±0.1%, X0.1Ω ±0.1%, X0.01Ω ±0.5%, X0.001Ω ±2%, X0.0001Ω ±5%
Dimensions: 284 × 95 × 94 mm
Weight: 1.15 kg

ZX96
Decades: 6
Total Resistance: 111,111.0 Ω
Accuracy: X100Ω ±0.1%, X10Ω ±0.1%, X1Ω ±0.1%, X0.1Ω ±0.1%, X0.01Ω ±0.5%, X0.001Ω ±2%
Dimensions: 284 × 95 × 94 mm
Weight: 1.25 kg

ZX97
Decades: 6
Total Resistance: 1,111,110.0 Ω
Accuracy: X1kΩ ±0.2%, X100Ω ±0.1%, X10Ω ±0.1%, X1Ω ±0.1%, X0.1Ω ±0.1%, X0.01Ω ±0.5%
Dimensions: 284 × 95 × 94 mm
Weight: 1.25 kg

ZX98
Decades: 7
Total Resistance: 111,111.1 Ω
Accuracy: X100Ω ±0.1%, X10Ω ±0.1%, X1Ω ±0.1%, X0.1Ω ±0.1%, X0.01Ω ±0.5%, X0.001Ω ±2%, X0.0001Ω ±5%
Dimensions: 327 × 95 × 94 mm
Weight: 1.35 kg

ZX99
Decades: 7
Total Resistance: 1,111,111.0 Ω
Accuracy: X1kΩ ±0.2%, X100Ω ±0.1%, X10Ω ±0.1%, X1Ω ±0.1%, X0.1Ω ±0.1%, X0.01Ω ±0.5%, X0.001Ω ±2%
Dimensions: 327 × 95 × 94 mm
Weight: 1.35 kg

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
    Weight: 4kg
DATASHEET ZX Series
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