Electrical; Electrical Measurements; Thermocouple Measurements; Resistance Thermometer Measurements - WIKA Pascal ET Betriebsanleitung

6. Commissioning, operation

6.2 Electrical

The Pascal ET is a multi-function calibrator.
The electrical modules can be maximum four, two of them are input modules (IN A – IN B), and the other two are output
modules (OUT A – OUT B).
EN

6.2.1 Electrical measurements

The instrument is able to measure voltage, current, resistance and frequency. To optimise the resolution and get better
measurement results, there are three ranges for voltage measurement, two for resistance measurements, one range for
current and three ranges for frequency.
Ranges of measurement and resolutions are specified in the table, see chapter 3.4 "Electrical signals".

6.2.2 Thermocouple measurements

The electrical module measures signals from the thermocouple and shows it in different engineering units (°C, °F, K).
Thermocouple types, measuring range, linearity error and related resolutions are given in the table, see chapter
3.7 "Thermocouple measurement").
It is possible to perform the measurement in two different ways: with internal reference (cold junction), with external reference
cold junction or by entering the reference value through the keyboard. When internal reference cold junction is selected, the
ambient temperature is measured through the thermocouple pins using a special resistance thermometer. This temperature
value is used for compensation. The standard connector Mignon for thermocouple is shown in Fig. 1 "Input panel module". The
resistance thermometer for compensation of the reference cold junction is integrated in the same connector.

6.2.3 Resistance thermometer measurements

The electrical module measures signals from resistance thermometer and shows it in different engineering units (°C, °F, K).
Resistance thermometer types, measuring range and related resolutions are given in the table, see chapter 3.6 "Resistance
thermometer simulation").
It is possible to connect the resistance thermometer according to the type of measurement: 2-wire, 3-wire and 4-wire. The
2-wire measurement is performed without any compensation of the connection cables resistances; in this case the connection
is among the two central (COM - Ω) pins. In the case of 3-wire connection the pin identified with the writing 3W must also be
used. While for the 4-wire measurement, the most accurate of the above, is performed by using all four pins.

6.2.4 Generation of electrical parameters

The output module (OUT) allows to generate voltage, current, resistance and frequency. For the voltage there are three
different ranges with different resolutions. Resistance has two ranges while current and frequency have only one range.
Ranges and resolutions are given in the table, see chapter 3.4.2 "Electrical output signal").

6.2.5 Thermocouple simulation

Through the output module it is possible to simulate thermocouples. This function can be used to test and calibrate:
thermocouple transmitters, analogue or digital indicators. A resistance thermometer Pt100, inserted in isothermal contact with
the connectors, measures the ambient temperature for the cold junction compensation. It is possible to disable the automatic
cold junction compensation and set out the reference temperature by the keyboard.
The instrument can simulate thermocouple types indicated in the table, see chapter 3.8 "Thermocouple simulation").
24 WIKA operating instructions, model Pascal ET