Inductance Standards and Decades Specifications

Help with Inductance Standards and Decades specifications:

Type

	Type
	Your choices are...
	Standard		Standards provide a highly accurate standard value of resistance, capacitance, inductance, voltage, or other electrical parameter for calibration and testing.  Standards usually consist of a single, fixed-value component or several components not in the same circuit.  Some standards are available that are continuously variable; often, they incorporate a potentiometer.  Standards that have more than one component (e.g., several fixed-value resistors) have multiple posts or a rotary switch to select different resistance values.
	Decade Box / Substituter		Decade boxes, decades or decade substituters provide highly accurate and digitally variable standard values of resistance, capacitance, inductance, or combinations of these electrical parameters for calibration and testing. Decade boxes usually consist of several components (e.g., resistors) within the same circuit. The standard resistance value is selected by varying of the number resistors in the series or parallel circuit.
	Other		Other unlisted forms or categories.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Back to Top

Specifications

	Decades		The number of decades available in the decade box.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Inductance Range		Inductance is the property of a circuit element that tends to oppose any change in the current flowing through it.  The core material, core shape and size, the turn count and the shape of the coil influence the inductance for a given inductor. The unit of inductance is the Henry (H).
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Inductance Accuracy		Inductance accuracy or tolerance is the allowed amount of variation from the nominal value as specified by the manufacturer.
	Search Logic:		All matching products will have a value less than or equal to the specified value.
	Self-Resonant Frequency (SRF)		Self-resonant frequency (SRF) is the frequency at which the inductor's distributed capacitance resonates with the inductance. At this frequency, the inductance is equal to the capacitance and they cancel each other out. As a consequence, the inductor acts as a purely resistive high-impedance element at this frequency. Also at this frequency, the Q-value of the inductor is zero.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.
	Inductance Resolution (per Step)		Resolution is the digital value represented by one bit in the display in a digital measure. For example, a decade box where one bit on the display represents 10 microF as a resolution of 10 microF (Also - Henrys/step or least significant digit <LSD>).
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Temperature Coefficient		The temperature coefficient parameter measures the rate at which the nominal resistance value changes as a function of temperature. It is expressed in parts-per million per degree Celsius (ppm/C).
	Search Logic:		All matching products will have a value less than or equal to the specified value.
	Operating Temperature		This is the full-required range of ambient operating temperature.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Stability		The stability in terms of accuracy over a period of a year.
	Search Logic:		All matching products will have a value less than or equal to the specified value.
	Quality Factor (Q)		Quality factor (Q) applies to capacitors and inductors to characterize relative losses. With capacitors, the Q value is defined as the ratio of capacitive reactance to the ESR (Equivalent Serial Resistance), or XC/Resr. Since both XC and Resr are functions of frequency, the test frequency must be given when specifying Q. At the self-resonant frequency, Q is zero (since the reactance is zero at this point). The quality factor is the reciprocal of the dissipation factor (DF). With inductors, the Q value is a measure of the relative losses in the inductor. It is defined as the ratio of inductive reactance to the effective resistance, or XL/Re. Since both XL and Re are functions of frequency, the test frequency must be given when specifying Q. At the self-resonant frequency, Q is zero (since the inductance is zero at this point).
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

Back to Top

Features

	Features
	Your choices are...
	NIST / National Lab Traceable		The standard's calibration can be traced to the National Institute of Technology Standards (NIST) or other national laboratory. The standard has been compared to a master standard that was checked against a NIST standard.
	AC		The standard or decade is suitable for alternating current (AC) calibration or testing applications.
	DC		The standard or decade is suitable for alternating current (DC) calibration or testing applications.
	Component / OEM		The standard, source or decade is suitable for use as a precision component in a larger system or product.
	Low Zero / Residual		The standard or decade has low values of zero, offset or residual impedance resistance, inductance or capacitance.
	Measurement / Calibrator		In addition to providing a standard reference value, the instrument can perform precision measurements (measures or reads) for testing or calibration.
	Computer Interface / Programmable		The decade box, voltage divider, or component has a computer interface option for programming, control, or data acquisition.
	Variable (Continuously)		The standard or reference can provide a precise and continuously variable value such as a variable capacitor or potentiometer.
	Rack Mount		The standard, decade box, or divider is designed or suitable for rack mounting.  Rack-mount units offer options for front and rear outputs.
	Stand Alone / Bench		The standard, decade box, or divider is packaged in a case with binding posts.
	Transfer / Laboratory		Transfer, primary, or laboratory-grade standards are used to compare or transfer the accuracies from NIST or national lab certified standards to working standards, sources, simulators and calibrators, or for precision meter calibration.
	Working		Working standards are robust or rugged units for production or in-line testing and calibration. Reference or working standards are compared or verified by the transfer or laboratory standards and are then used for calibration, testing and inspection of other components, meters and instruments.
	Other		Other proprietary, patented or unlisted features.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Back to Top