ZX74 Decade Resistance Box

ZX74 Decade Resistance 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 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.

FEATURE

• High accuracy and stability;
• Low temperature coefficient;
• Fully sealed precision switch, no need for cleaning;
• Non inductive resistor.

APPLICATION

• 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.

 SPECIFICATION

Accuracy in Percent (%)

Notes:

• Above listed accuracies are under reference conditions: ambient temperature 20℃±1℃, Relative humidity 40% - 60%,

• Standard operation conditions: ambient temperature 20℃±10℃, relative humidity 25% - 75%;
• For ZX74/5/6/7 series, Reference power: 0.05W;  Nominal power: 0.1W;  Max power: 0.2W (not exceeding 2 hours)
• For ZX83/4 series, Reference power: 0.1W;  Nominal power: 0.2W (1-100KΩ), 0.1W (>100KΩ, ≤700V);  Max power: 0.3W (not exceeding 2 hours)
• Insulation resistance between circuit and metal case: > 500M Ω (under reference conditions); With stand voltage: 2000VAC/45Hz - 65Hz for 1 minute

SCOPE OF DELIVERY

• ZX74 series od decade resistance box
• Factory calibration report
• Test lead Set (as below)

OPTIONAL ACCESSORIES

• Accredited calibration certificate (P/N: 9000-ZX74)