Signal Filters Specifications

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Filter Specifications


	Low Pass Cutoff Frequency		The low pass cutoff frequency is the nominal frequency below which the input signal is passed and above which the signal is blocked.
	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.

	High Pass Cutoff Frequency		The high pass cutoff frequency is the nominal frequency above which the input signal is passed and below which the signal is blocked.
	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.

	Analog Input Channels:		This is the maximum number of analog channel inputs. The single-ended number is specified when single-ended inputs are available as twice the number of differential inputs. Differential channels use the difference between two signals as an input; common mode is filtered out. In some systems, differential inputs are combinations of two single-ended inputs. When this is the case, twice the number of differential channels are available as single-ended inputs.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	Differential Channels		Differential channels have two inputs. The signal to process is the voltage (V) difference between the two inputs. For example, if one reading is 4.93 V and the other reading is 5.16 V, the meaningful value is the 0.23 V difference between the two. Often, this applies to precision measurements where the difference between two low-voltage inputs is small but critical.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Filter Type:
	Your choices are...
	Low Pass		Low pass filters block or attenuate signals at frequencies above the specified cutoff frequency.
	High Pass		High pass filters block or attenuate signals at frequencies below the specified cutoff frequency.
	Band Pass		Band pass filters block or attenuate signals at frequencies outside of the specified low pass and high pass cutoff frequencies. This is frequently done by combining or "cascading" low-pass and high-pass filters.
	Band Stop		Band stop filters block a portion of the frequency spectrum, allowing lower and higher frequencies to pass.
	All Pass		All-pass filters allow all frequencies to pass; they can be used to introduce desired phase shifts in signals.
	Other		Other unlisted or specialized filter forms.
	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.

	Filter Frequency Response:
	Your choices are...
	Bessel		Bessel filters have a relatively flat bandpass and slow roll-off. The stopband is fairly monotonic (ripple-free). Their circuitry is complex compared to other filters.
	Butterworth		Butterworth filters provide a very flat response. There is almost no attenuation in the bandpass. The roll-off rate is somewhat slower than other filters.
	Cauer (Elliptic)		Cauer or elliptic filters provide the fastest roll-off for a given order (number of poles). The pass band and stop band will typically have ripples.
	Chebyshev		Chebyshev filters provide a very fast roll-off, but at the expense of a rippled pass band.
	Linear Phase		Linear phase response filters preserve the phase characteristics of a signal by time-delaying the signal components equally.
	Other		Other filter types.
	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.

	Filter Technology:
	Your choices are...
	Analog (RC)		Analog filters are designed with resistors and capacitors. They are used for analog signals only, and are often used in low-noise requirement applications.
	Digital (FIR, IIR)		Digital filters are designed with solid-state components, and used for digital signals and quantized signals from a sample-and-hold amplifier. This category includes finite impulse response (FIR) and infinite impulse response (IIR) filters. Digital filtering can approach ideal bandpass characteristics.
	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.

	Number of Poles:		Poles are a measure of complexity of the filter circuitry. In general, more poles will provide a steeper roll-off for a given filter type.
	Your choices are...
	2
	4
	6
	8
	Other
	Search Logic:		Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Form Factor


	Form Factor
	Your choices are...
	Printed Circuit Board (PCB)		Devices are printed circuit boards (PCBs) that attach to enclosures or plug directly into computer backplanes.
	Panel / Chassis Mount		Devices attach to a panel or bolt onto a chassis.
	Modular Bay / Slot System		Devices stack in modular bays or slots, and can be interfaced to other units.
	Rack Mount		Devices are rack-mounted and fit inside enclosures such as a standard 19 in. telecommunications rack.
	DIN Rail		Devices mount on a standard DIN rail. DIN is an acronym for Deutsches Institut für Normung (DIN), a German national organization for standardization.
	Stand Alone		Devices are benchtop or floor-standing units with a full casing or cabinet, and an integral interface.
	Other		Other unlisted form factors.
	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.

Additional Specifications


	Programmable Filter?		Filter parameters such as cutoff frequencies may be interactively programmed by the user.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Anti-aliasing Filter?		Aliasing is the misrepresentation of a signal that comes from an improperly slow sampling of a signal. An anti-aliasing filter generally has a sharper cutoff than a normal low-pass filter to reduce this misrepresentation due to the influence of frequencies higher than desired. It is specified according to the sampling rate of the system and there should be one filter per input signal.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Application Software Included?		Products include compatible software for control, or for monitoring data acquisition and signal conditioning from a supervisory or host computer.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Operating Temperature		Full required range of ambient operating temperature.
	Search Logic:		User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.

Signal Filters Specifications

Low Pass Cutoff Frequency:

High Pass Cutoff Frequency:

Analog Input Channels:

Differential Channels?

Filter Type:

Filter Frequency Response:

Filter Technology:

Number of Poles:

Form Factor:

Programmable Filter?

Anti-aliasing Filter?

Application Software Included?

Operating Temperature:

Help with Signal Filters specifications: