System Components and Range of Applications
The METRAHIT CAL calibrator functions as a highly accurate calibration and simulation instrument for electrical quantities. As a handheld instrument, it’s suitable for precise, on-site calibration and inspection tasks, as well as for test department and laboratory work. Thanks to its diverse functions, the highly flexible instrument can be used in process engineering, control room and equipment fabrication, general measuring technology and many other applications. As a system component it can always be used in calibration systems for calibrating measuring transducers, buffer amplifiers, transmitters, temperature measuring and recording instruments, controllers, signaling devices and indicators.
Universal Calibration Standard
Integrated electronics generate mV, V and mA signals. Beyond this, they’re capable of simulating thermo-voltages for various types of thermocouples for predefined temperatures (°C or °F), as well as resistance values for various Pt and Ni temperature sensors.
Integrated electronics generate mV, V and mA signals. Beyond this, they’re capable of simulating thermo-voltages for various types of thermocouples for predefined temperatures (°C or °F), as well as resistance values for various Pt and Ni temperature sensors.
Frequency and Pulse Run Generator
Continuous frequency signals can be transmitted by the METRAHIT CAL for testing SPCs, energy metering devices, flow rates and more. Amplitude is adjustable for the generated square-wave pulses, which are used to simulate sensor pulses. Predefined pulse runs are also transmitted at a given frequency.
Continuous frequency signals can be transmitted by the METRAHIT CAL for testing SPCs, energy metering devices, flow rates and more. Amplitude is adjustable for the generated square-wave pulses, which are used to simulate sensor pulses. Predefined pulse runs are also transmitted at a given frequency.
Calibration and Simulation
Measuring transducers with a wide variety of input signals (voltage, thermo-voltage, RTD and 2-wire resistance sensors etc.) can be directly connected and calibrated. If a multimeter is used (e.g. METRAHIT X-TRA), the respective values can be measured at the measuring transducer’s output, transmitted to a PC via an adapter if desired, displayed with the help of optional METRAwin90-2 software and compared with the appropriate calibration specifications. Setpoint values and actual values are displayed, or printed as a certificate. When operated in the “mA sink” mode, the METRAHIT CAL simulates a 2-wire transmitter and retrieves the selected current value from the measuring sequence.
Measuring transducers with a wide variety of input signals (voltage, thermo-voltage, RTD and 2-wire resistance sensors etc.) can be directly connected and calibrated. If a multimeter is used (e.g. METRAHIT X-TRA), the respective values can be measured at the measuring transducer’s output, transmitted to a PC via an adapter if desired, displayed with the help of optional METRAwin90-2 software and compared with the appropriate calibration specifications. Setpoint values and actual values are displayed, or printed as a certificate. When operated in the “mA sink” mode, the METRAHIT CAL simulates a 2-wire transmitter and retrieves the selected current value from the measuring sequence.
Read-Out Modes for Source and Sink Functions
Calibration signals can be read out either manually (numerically with key entries), or automatically by means of intervals with intermediate steps, or as a ramp in a stepless fashion. The METRAHIT CAL can thus be used as a precision pulse generator for dynamic testing.
Depending upon individual needs, desired dynamic response can be derived from, for example, the full-scale value and the number of intermediate steps (intervals), or rise and dwell periods (ramp). This is especially helpful for long-term testing of laboratory and panel recorders, as well as measuring transducers, and for “one-man” control rooms.
Fixed value
Calibration values are set and read out manually with the help of the instrument’s keypad immediately after the calibration function has been selected.
Interval
Continuous read-out of calibration values is accomplished in steps between the minimum and maximum values selected at the device to be calibrated in this read-out mode. The following step can be triggered automatically (time per step: 1 second to 60 minutes) or manually.
Ramp
Continuous read-out of calibration values is accomplished in a stepless fashion between the minimum and maximum values selected at the device to be calibrated in this read-out mode. Ramp duration for rising and falling ramps, as well as dwell time at min. and max. values, can be set within a range of 1 second to 60 minutes.
Temperature Simulation
The ten most common sensor types are available for the simulation of thermo-voltages. Thermo-voltages can be read out with reference to an internal (terminal temperature) or an external reference junction.
Temperature for the external reference junction can be set at the calibrator or with a PC. This eliminates the need to connect the device to be calibrated with the calibrator via the respectively required compensating lead. A copper conductor between the calibrator and the device to be calibrated is sufficient in this case.