ZX - Resistance standard, 6-decade boxes - 1 mΩ to 10 MΩ
ZX - Resistance standard, 6-decade boxes - 1 mΩ to 10 MΩ
ZX - Resistance standard, 6-decade boxes - 1 mΩ to 10 MΩ

ZX

picto fleche Resistance standard, 6-decade boxes - 1 mΩ to 10 MΩ

ZX series of 6 decade boxes are very high accuracy and stable six-dial instruments. They are designed for accurate and reliable applications in laboratories or onsite use as resistance thermometer simulation. There are 6 models in the series with a maximum resistance of 111,111,100 Ω.

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ZX series of 6 decade boxes are very high accuracy and stable six-dial instruments. They are designed for accurate and reliable applications in laboratories or onsite use as resistance thermometer simulation. There are 6 models in the series with a maximum resistance of 111,111,100 Ω.

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 1 mΩ. 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.

On request, they can be supplied with a COFRAC calibration certificate delivered by our accredited laboratory SOFIMAE.

Resistance generation

Type Total resistance Dials available
x 10 MΩ x 1 MΩ x 100 kΩ x 10 kΩ x 1 kΩ x 100 Ω x 10 Ω x 1 Ω x 0,1 Ω x 0,01 Ω x 0,001 Ω
ZX74 1,111.110 Ω ±0.01% ±0.01% ±0.05% ±1% ±2% ±5%
Imax 45 mA 140 mA 450 mA 1.4 A 1.4 A 1.4 A
ZX75 11,111.1 Ω ±0.01% ±0.01% ±0.02% ±0.05% ±0.5% ±5%
ZX76 111,111.0 Ω ±0.01% ±0.01% ±0.01% ±0.02% ±0.1% ±1%
ZX77 1,111,110 Ω ±0.05% ±0.05% ±0.05% ±0.05% ±0.1% ±1%
Imax 1 mA 3 mA 10 mA 30 mA 100 mA 300 mA 1 A 3 A
ZX83 11,111,110 Ω ±0.05% ±0.05% ±0.05% ±0.05% ±0.05% ±0.05%
ZX84 111,111,100 Ω ±0.1% ±0.05% ±0.05% ±0.05% ±0.05% ±0.05%
Imax 0.1 mA 0.3 mA 1 mA 3 mA 30 mA 100 mA

Direct reading of generated value
Minimum value:
- ZX74 model: 0.1 Ω
- Other models: < 20 mΩ
Accuracy at 20°C ±2ºC:
- ZX74 / ZX75 / ZX76 models: (0.01% + 0.002 Ω)
- ZX77 / ZX83 / ZX84 models: (0.05%+ 0.002 Ω)
Insulation resistance: > 1000 MΩ at 1000 V
Temperature coefficient: -5 to +10 ppm/ºC
Maximum admissible voltage on terminals: 30 V~ RMS or 50 V- according to IEC 61010-1
Maximum power: 0.2 W

General specifications

Size 440 x 130 x 120 mm
Weight 4 kg

Environmental specifications

Reference range 20°C ±2°C (RH: 40 to 80% non-condensing)
Operating reference range 5 to 35°C (RH: < 75% non-condensing)

Instrument:

RD6D-ZX74            6-decade resistance box: 10 x 0.001 Ω to 10 x 100 Ω

RD6C-ZX75            6-decade resistance box: 10 x 0.01 Ω to 10 x 1 kΩ

RD6B-ZX76            6-decade resistance box: 10 x 0.1 Ω to 10 x 10 kΩ

RD6A-ZX77            6-decade resistance box: 10 x 1 Ω to 10 x 100 kΩ

RD-ZX83                6-decade resistance box: 10 x 10 Ω to x 1 MΩ

RD-ZX84                6-decade resistance box: 10 x 100 Ω to 10 x 10 MΩ

Certification:

QMA11EN              COFRAC certificate of calibration

Packing information:

Shipping size          440 x 130 x 120 mm

Weight                   4 kg