7 Decade Resistance Box
Product Code : SCL-EAE-11296
Quick answer: The 7 Decade Resistance Box is a variable resistance box with seven decades, each covering a different power of ten. The values set on the decades add together, so a known resistance can be dialled into a circuit for substitution, bridge balancing, meter checking and Ohm's law work. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Parameter | Detail |
|---|---|
| Instrument type | Variable resistance decade box |
| Number of decades | 7 |
| Selection principle | Additive: the settings of all decades sum to the total resistance |
Resistance span, smallest step, tolerance and power rating are not listed on this page; ask for them with the quotation.
How the decade resistance box is used
Each decade holds resistors of one order of magnitude, ten times the value of the decade below, and its control sets how many of those steps are in circuit. Because the decade values add, the total resistance is read off like the digits of a number. Seven decades give a wide choice of values from one instrument, instead of a drawer of loose fixed resistors.
In a substitution experiment an unknown resistor is replaced by the decade box, which is adjusted until the meter shows the same reading as before; the box setting then equals the unknown resistance. The same box serves as the known arm of a Wheatstone bridge, as a variable load for checking a meter, and as a set resistance in Ohm's law and Kirchhoff's law circuits.
- Switch off and isolate the circuit before making connections.
- Set every decade to its lowest value.
- Connect the resistance terminals into the circuit with suitable leads.
- Switch on and adjust the decades from the highest order downwards until the required reading or balance is reached.
Key features
- Seven resistance decades in one bench instrument
- Additive selection: decade settings sum to the total
- Changes resistance quickly without swapping loose resistors
- Decade markings make the total easy to read and help teach place value
- Suits substitution, bridge, meter and circuit-law practicals
- Reusable for repeated supervised experiments
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the 7 decade resistance box at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
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The full range is in the Electrical and Electronics section of the Physics Lab range.
Frequently asked questions
How is the resistance of a decade box read?
Read each decade setting and add them. Because each decade is ten times the one below, the settings read like the digits of the total resistance.
What is a 7 decade resistance box used for?
Substituting known resistances in test circuits, balancing Wheatstone bridges, checking meters, and Ohm's law and Kirchhoff's law experiments.
What is the price of the 7 decade resistance box?
Prices are not published on the website. Add the 7 decade resistance box to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-EAE-11296 and the quantity, to receive a quotation.
Does Lab Exports manufacture the 7 decade resistance box?
Yes. Lab Exports manufactures the 7 decade resistance box at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-EAE-11296.
Request a quote
Email [email protected] with the house code SCL-EAE-11296 and the quantity, or add the 7 decade resistance box to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
