Frequency Meter
Measuring instrument for determining and displaying the frequency of an electrical signal or network.
A frequency meter is intended to measure the frequency of voltage or another applicable electrical signal.
Principal characteristics include minimum and maximum frequency range, accuracy, resolution, and required input-signal parameters.
Depending on the design, the instrument may be digital or analogue, panel-mounted, modular, or integrated with another measuring device.
For network applications, compatibility of the measuring range with the nominal system frequency and suitable measuring-input withstand are particularly important.
Selection criteria include frequency range, accuracy, input voltage, display type, dimensions, and mounting method.
Panel-mounted digital and analogue frequency meters and frequency indicators for electrical networks and generators.
Frequency Meter
General6
Commercial or technical designation of a manufacturer's product family sharing a common design and compatible characteristics.
Range of tasks and systems for which the manufacturer recommends the component.
Primary function of the device and its intended use as defined by its design and the manufacturer's documentation.
Permissible installation location of the product: indoors, outdoors, in a technical area, or as part of equipment.
Environmental conditions under which installation and operation of the product are permitted.
Permissible spatial orientation of the component during installation and operation.
Dimensions12
External horizontal dimension of the product between its outermost lateral points.
External vertical dimension of the product from its lowest to its highest point.
External distance between the foremost and rearmost surfaces of the product.
Horizontal dimension of the mounting cutout or opening required to install the product in a prepared surface or recess.
Vertical dimension of the mounting cutout or opening required to install the product in a prepared surface or recess.
Depth of the mounting cutout or recess intended to accommodate the recessed part of the product.
Depth of the enclosure portion installed within a wall or mounting recess.
Distance by which the front part of the installed product projects beyond the wall surface.
Centre-to-centre pitch between adjacent electrical terminals in the relevant terminal row.
External width of the front bezel or front frame of a panel-mounted measuring device.
External height of the front bezel or front frame of a panel-mounted measuring device.
Geometric shape of the visible front bezel of a panel-mounted measuring instrument.
Capacity and Layout10
Number of available digital inputs of the product.
Number of available digital outputs of the product.
Number of terminal blocks included in the product's standard equipment or provided for the specific version.
Number of independent relay outputs or sets of switching contacts provided by the product.
Number of integrated analog outputs provided by the product.
Number of integrated physical Ethernet communication ports.
Number of integrated physical RS-485 communication interfaces.
Number of integrated physical USB ports provided by the product, including charging, data, communication or programming ports.
Number of independently usable monitoring, switching or alarm thresholds provided by the device.
Number of supplied or required panel mounting clamps used to retain the device in the installation cutout.
Materials and Finish4
Primary material from which the product is manufactured.
Grade, alloy, class, or technical designation of the product's primary material.
Primary visually perceived colour of the product's external surface.
Designation of the product's primary surface colour according to the RAL colour system.
Mounting and Installation12
Installation arrangement permitted by the product design, such as wall-mounted, flush-mounted, floor-mounted, or another specified mounting type.
Method used to mechanically secure the product to a support, surface, or load-bearing structure.
Conductor connection methods supported by the specified terminals or connection elements.
Tightening torque specified by the manufacturer for a screw or bolted terminal connection.
Indicates that one or more terminal blocks can be removed from the device body for wiring or service.
Indicates that one or more electrical terminal blocks use a pluggable disconnectable connection system.
Indicates that electrical connection terminals are individually identified by manufacturer-applied markings.
Physical directions from which conductors or tools access the electrical connection terminals.
Minimum conductor cross-section accepted by the relevant general device terminal connection.
Maximum conductor cross-section accepted by the relevant general device terminal connection.
Thread designation of the screw used in the conductor clamping mechanism, for example M2.5, M3, M4, or another manufacturer-declared designation.
Indicates that the clamping element required to secure a panel-mounted device in its cutout is supplied with the product.
Electrical Parameters24
Type of electrical current for which the product's main supply circuit is intended.
Voltage value assigned to the product by the manufacturer for specified application conditions and characteristics.
AC frequency assigned to the product for normal operating conditions.
Lower limit of the electrical network or signal frequency at which product operation is permitted.
Upper limit of the electrical network or signal frequency at which product operation is permitted.
Number of phases of the electrical system for which the product is designed to be connected or used.
Rated external auxiliary supply voltage required for the product's active functions.
Type of current and source used for the product's auxiliary supply.
Voltage with reference to which the product's insulation clearances and dielectric properties are specified.
Peak value of an impulse voltage of specified waveform that the product insulation must withstand without breakdown.
Test voltage applied to verify the dielectric strength of the product insulation.
Minimum permissible insulation resistance between the specified electrically separated parts.
Category characterizing the expected level of impulse overvoltages at the product's point of use.
Degree of pollution of the surrounding microenvironment considered when selecting insulation distances and product characteristics.
Type of electrical insulation used, considered in terms of its protective function and construction.
Indicates whether the product can measure and provide electrical network frequency values.
Types of analog signals supported by the product outputs.
Electrical measurement principle used for evaluation of the monitored signal, such as true RMS, RMS, average-value or direct-value measurement.
Indicates that the monitoring device derives its operating power directly from the measured circuit and does not require a separate auxiliary supply.
Minimum signal frequency accepted by the measuring circuit for the declared monitoring or measurement function.
Maximum signal frequency accepted by the measuring circuit for the declared monitoring or measurement function.
Manufacturer-declared absolute accuracy of frequency measurement.
Sampling rate used by the measuring system for acquisition of electrical signals.
Time interval between successive updates of measured or calculated values made available by the device.
Protection and Safety8
Degree of enclosure protection against access to hazardous parts and ingress of solid objects and water, designated by the IP code.
Class of enclosure resistance to external mechanical impacts designated by the IK code.
Method or level of protection of the user against direct contact with hazardous live parts.
Indicates whether the design prevents finger access to hazardous live parts in the intended condition.
Classification of a material according to its ability to ignite, sustain combustion, and cease burning under a specified test.
Temperature of the heated wire used when testing the material or product against an ignition source.
Indicates whether the product material is classified as halogen-free according to the characteristics declared by the manufacturer.
Indicates that the terminal cover can be sealed or plombed against unauthorized access.
Environmental Conditions14
Minimum ambient temperature at which normal operation of the product is permitted.
Maximum ambient temperature at which normal operation of the product is permitted.
Maximum permissible average ambient temperature over a consecutive 24-hour period.
Minimum ambient temperature permitted during storage of the product while not in operation.
Maximum ambient temperature permitted during storage of the product while not in operation.
Minimum relative air humidity permitted for the declared operating or test condition.
Maximum relative air humidity permitted for the declared operating or test condition.
Temperature at which the corresponding relative humidity value is specified or standardized.
Indicates whether the permissible humidity value applies only to non-condensing conditions.
Maximum altitude above sea level at which the product may be installed without exceeding the declared conditions.
Indicates whether the permissible product load must be reduced as installation altitude increases.
Altitude above sea level above which the permissible product load must be reduced.
Indicates whether the product's resistance to vibration has been verified under the declared conditions.
Indicates whether the product's resistance to short-duration mechanical shocks has been verified.
Included Equipment22
Indicates whether a touchscreen is provided for user input through the local HMI.
Indicates whether a local human-machine interface (HMI) is provided for monitoring, configuration, or control.
Indicates whether the product has an integrated local display.
Technology or construction type of the product's integrated display.
Indicates whether the integrated display has a backlight.
Number of integrated LEDs used to indicate product status or operating modes.
Indicates whether documentation is included in the product's standard supply.
Indicates whether an installation manual is included with the product.
Number of integrated user keys or buttons available for local navigation, programming or control.
Indicates that current measured values can be shown on the integrated display.
Indicates that fault, warning or diagnostic messages can be shown on the local display.
Indicates that the display changes color or uses color coding to distinguish normal, warning, fault or configuration states.
Number of numeric digits that can be shown simultaneously on the primary numeric display field.
Number of simultaneously visible text or measurement lines on the integrated display.
Maximum number of alphanumeric characters displayed in one text line.
Horizontal pixel resolution of a graphical integrated display.
Vertical pixel resolution of a graphical integrated display.
Physical diagonal dimension of the integrated display viewing area.
Number of predefined or configurable local display pages available for measured values or device information.
Indicates that the device can automatically cycle through display pages or measured values.
Indicates that the currently displayed measured value can be held or frozen on the local display.
Indicates that the measurement unit associated with a displayed value is shown locally.
Special Features47
Indicates whether the product stores or provides minimum and maximum values of measured quantities.
Indicates whether the product can store an internal event log.
Indicates whether the product performs internal diagnostic checks to detect or report internal faults.
Maximum number of event records that can be stored in the product's internal log.
Indicates whether an integrated real-time clock is provided for timekeeping, event time-stamping, or time-based functions.
Indicates whether user-configurable functions can be assigned to one or more digital inputs.
Indicates whether user-configurable functions can be assigned to one or more digital outputs.
Indicates whether the product supports digital data exchange with external devices or systems.
List of supported digital data communication protocols.
List of supported physical or logical digital communication interfaces.
Indicates whether specified product settings can be read or changed remotely through a supported communication interface.
Indicates whether diagnostic information, status data, or fault information can be obtained remotely.
Indicates whether one or more measured values can be stored, for example the latest, minimum, maximum, or a value associated with a fault event.
Functions permanently assigned or assignable to the product relay outputs.
Indicates that device firmware can be updated by a manufacturer-supported procedure.
Manufacturer-declared duration for which the real-time clock continues to retain valid time information without normal supply voltage.
Electrical or physical monitoring functions provided by the device, such as overvalue, undervalue, window, phase, frequency, current, power, insulation, temperature or level monitoring.
Indicates that device settings can be configured directly on the product using integrated controls or a local HMI.
Types of measured values that can be retained by the product, such as last, minimum, maximum or fault-associated values.
Indicates that stored events, warnings or faults can include a date and/or time stamp.
Indicates that current measured values can be read by an external controller, software system or communication master.
Indicates that warning, fault, status or diagnostic information can be transmitted through a supported digital communication interface.
Indicates that local configuration access can be intentionally restricted against unauthorized changes.
Methods supported for restricting access to local device configuration.
Indicates that measured electrical values can be stored internally as historical measurement records.
Maximum number of historical measurement records retained internally.
Indicates that the interval between periodic measurement records can be configured.
Minimum configurable interval between periodically stored measurement records.
Maximum configurable interval between periodically stored measurement records.
Indicates that stored measurement or event history can be exported from the device.
File or interchange formats supported for exporting stored measurement data.
Supported serial communication baud rates for interfaces such as RS-232, RS-422, RS-485 or equivalent serial buses.
Supported data-word lengths for serial communication.
Parity modes supported by the serial communication interface.
Supported number of stop bits in serial communication frames.
Functions that can be assigned or are dedicated to integrated digital inputs.
Functions that can be assigned or are dedicated to integrated digital outputs.
Indicates that the correspondence between measured quantity and analogue output signal range can be configured.
Measured quantities that can be assigned to an analogue output channel.
Indicates that stored minimum and maximum measured values include the time at which the extreme value occurred.
Indicates that measured or calculated quantities can be compared with configured limits to generate alarms or status conditions.
Indicates that configured measurement alarms can be assigned to available relay, digital or equivalent outputs.
Indicates that the measuring device can detect manufacturer-defined wiring errors affecting its voltage or current measurement inputs.
Indicates explicit indication when an input or calculated measured quantity exceeds its valid measurement range.
Indicates explicit indication when an input or measured quantity is below its valid or usable measurement range.
Indicates that the condition of the battery, capacitor or other backup source used for the real-time clock can be monitored or diagnosed.
Indicates that the device can detect corruption or integrity failures affecting stored configuration, measurement or metrological data.
Standards and Compliance25
Regions or markets for which the manufacturer declares regulatory or certification compliance of the product.
Certification, market-approval, or conformity marks applicable to the product.
Primary normative document or standard according to which the manufacturer classifies or assesses the product.
Additional normative documents and standards declared by the manufacturer as applicable to the product.
Indicates whether an official declaration of conformity is available for the product.
Indicates whether a certificate relating to the declared certification or conformity of the product is available.
Identification number of the certificate relating to the product or its certified version.
Name of the organization that issued the certificate or performed the relevant conformity assessment.
Indicates whether the CE marking is applied to the product where applicable.
Indicates whether the EAC marking is applied to the product where applicable.
Indicates whether the cULus mark is applied to the product where applicable.
Indicates whether the product has a declared CSA certification or recognition status.
Indicates whether product compliance with applicable RoHS restrictions on hazardous substances has been declared.
Indicates whether the manufacturer declares compliance of the product with applicable REACH Regulation requirements.
Indicates that the measuring function can be calibrated using a manufacturer-defined procedure.
Indicates that the product is calibrated by the manufacturer before delivery.
Indicates that a calibration certificate can be supplied for the product.
Manufacturer-recommended interval between periodic calibrations, where such an interval is specified.
Indicates that calibration can be performed in the installed location without factory return.
Indicates that an authorized user can execute a manufacturer-supported calibration procedure.
Indicates support for adjustment or calibration of measurement zero offset.
Indicates support for gain or span calibration using a reference measurement value.
Number of calibration points supported by the manufacturer-defined calibration procedure.
Indicates that access to calibration parameters or procedures is protected against unauthorized changes.
Indicates that the manufacturer provides a defined procedure or test facility for verifying measurement accuracy.
Logistics9
Mass of the product together with its individual packaging and the accessories included in it.
External horizontal dimension of the product's individual package.
External vertical dimension of the product's individual package.
External depth dimension of the product's individual package.
Design type of the product's individual or transport packaging.
Mass of the product itself, excluding transport packaging, additional accessories, and external equipment.
Country of origin of the goods declared for customs or commercial purposes.
Commodity code under the international Harmonized Commodity Description and Coding System.
Commodity code under the Combined Nomenclature of the European Union.