- calibration of pointer, indication instrument and recorders
- simulation of thermocouples
- plotting of components characteristics and checking of amplifiers, transducers, etc.
The function SINK can simulate a 2 wire transducer in a current loop. The output level can be changed between 4, 8, 12, 16 and 20 mA signals by one touch for the “4-20 mA” output, and between 1, 2, 3, 4 and 5 V DC signals for the “1-5 V” output, for efficient calibration work. While the “ramp function” increases and decreases the output level to the present level at a constant rate for the selected sweep time (16 or 32 seconds).DIGISTANT® model 4462 can be used either as a standalone table-top device, or in automatic, computer assisted manufacturing and testing systems. Its applications include:
- calibration of current and DC voltage meters
- testing of thermocouples
- calibration of controllers, sensors, detectors, and other devices used in process control
- integrated ramp function for open-loop process control
Burster DIGISTANT® 4462 is possible to set currents from ± 200 nA to ± 52 mA, voltages of ±1μV to ± 30 V and, optionally temperature set point values of 14 thermocouple types. Thermovoltage sourcing can be entered by °C, °F and K, the temperature scales ITS 90 or IPTS 68. Furthermore, when sourcing thermocouples a calibrated external comparison point can be used, whereby the data for calibration in the device can be taken into consideration. The device can be operated both via the keyboard as well as the interface. For more details pleases download product brochure.
|High precision Calibration Source DIGISTANT®Model 4462||±30V(±60V); ±52mA(±22mA); Thermocouple: 14 types||0.003% Rdg. (error limit)||5℃..23℃..40℃||– Simulation for all conventional thermocouple types; – Standard with RS232 & IEEE488 interface, USB and Ethernet; – Current “SINK”.|
Calibration, according to The International Vocabulary of Metrology, is defined as an “operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties and, in a second step, uses this information to establish a relation for obtaining a measurement result from an indication.” A reliable, stable DC voltage source is required as the reference of calibration. The DC and AC currents are scaled from this voltage reference.The purpose of using calibrator is to ensure the accuracy of the outputs. The accuracy can have a broad range of definitions and is affected by many parameters in the system. In this circumstance, accuracy can be defined as the difference/error between the true value and the measured value or how close a measured value is to the actual value. In reality, the true value is hardly obtained due to the limitation of measurement method and tools we used, while calibration is to compensate systematic errors of the measurement to improve the accuracy of the results.Calibration assumes a profile for the relationship between the actual value and the measured value. This profile depends on the characteristics of the components used in the measurement. There are two calibration profiles: one corrects for offset error only, and the second accounts for both offset and gain errors. Figure 1 illustrates these typical profiles that define the calibration implementation methodology and Figure 2 explains the relationship between the actual value and measured value.Burster universal precision calibrator source 4411 and 4462 operates on the principle of current and voltage. According to Ohm’s Law, V(voltage) =I(current) • R(resistance) , the amount of electric current through a metal conductor in a circuit is directly proportional to the voltage impressed across it, for any given temperature. By specifying any two of the quantities in circuit it determines the third. Along with voltage law and current law, the voltages and currents associated with a particular circuit and the power can be analysed and identified.