Operating Instructions METRAHIT⏐CAL Calibrator 3-349-442-03 11/12.
Operating Overview – Connections, Keys, Rotary Switch, Symbols 14 13 1 12 2 12 3 10 4 9 5 6 7 8 ! 2 1 Display (LCD) (see page 3 for significance of symbols 2 HOLD / CONT Pause/resume ramp/interval Increase parameter values Selection of individual menu entries against direction of flow Mode menu: 3 ON / OFF | LIGHT, key for switching device and display illumination on and off 4 OUT | ENTER OUT: Switch calibrator output on and off Mode menu: Acknowledge entry (ENTER) 5 Move cursor to the rig
Symbols used in the Digital Display 1 2 3 4 5 6 7 15 8 9 14 10 12 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Battery level indicator NUM: Numeric entry of the output signal INT: Interval sequence active RAMP: Ramp function active SINK: Current sink is active SOURCE: Current source is active ON: The calibrator output is active IR: Infrared interface display Auxiliary display with decimal point and polarity display Main display with decimal point and polarity display Calibration unit of measure : Simulator i
Table of Contents Page 1 Safety Features and Precautions ....................................................5 Page 12 Maintenance .................................................................................29 Displays – Error Messages ........................................................................... 29 Batteries ...................................................................................................... 29 Fuses ...................................................................
1 Safety Features and Precautions You have selected an instrument which provides you with a high level of safety. This instrument fulfills the requirements of applicable European and national EC directives. This is confirmed by means of the CE mark. A corresponding declaration of conformity can be requested from GMC-I Messtechnik GmbH. The device has been manufactured and tested in accordance with safety regulations IEC 61010–1:2010/DIN EN 61010– 1:2010/VDE 0411–1:2011.
Meanings of Symbols on the Instrument ! Warning concerning a source of danger (attention: observe documentation!) Ground Continuous, doubled or reinforced insulation Indicates EC conformity The device may not be disposed of with the trash. Further information regarding the WEEE mark can be accessed on the Internet at www.gossenmetrawatt.com by entering the search term WEEE.
2 Initial Start-Up Battery operation Be certain to refer to section 12.2 regarding correct battery installation. ! Attention! As a result of internal battery voltage monitoring, the instrument may respond as follows if the battery charge level is low: – Cannot be switched on. – Shuts back down immediately. – Shuts back down if a load is connected to the output. If this is the case, replace the batteries in accordance with section 12.2, or continue work with the power pack if possible.
3 Voltage Source [V] Voltages can be simulated within the following ranges: 0 … ±60 mV, 0 … ±300 mV, 0 … 3 V, 0 … 10 V and 0 … 15 V. Resistance of the connected circuit should not be any less than 1 kΩ. – CALIBRATOR Output + ≥1kΩ Device to be calibrated, e.g. measuring transducer – Input + ➭ Connect the device to be calibrated with the measurement cable as shown. ➭ Select the V calibration function with the rotary switch. ➭ Switch the calibrator on by pressing the ON / OFF | LIGHT key.
4 Frequency Generator (positive square-wave pulses) [Hz] Voltage and frequency can be set independent of each other for frequency generators. The output signal is a square wave. Resistance of the connected circuit should not be any less than 1 kΩ. ➭ Connect the device to be calibrated with the measurement cable in the same way as specified for the voltage simulator. ➭ Select the HZ calibration function with the rotary switch. ➭ Switch the calibrator on by pressing the ON / OFF | LIGHT key.
5 Resistance Simulation [Ω] The resistance simulator is capable of simulating resistors using 2-wire connection for the following range: 5 … 2000 Ω. 2-Wire Resistance Simulation Abbreviated Instructions Select the calibration function. Ω ON/OFF LIGHT CALIBRATOR – Output + Device to be Calibrated Change the fixed value. 0000.0 Ω – Note! The following error messages are possible: “HiCurr” (high current – current value to high) where I > 4.
6 Temperature Simulation [°C / °F] The temperature simulator is capable of simulating resistance temperature detectors (RTD) or thermocouples (TC) with specification of the external reference junction temperature. ➭ Connect the device to be calibrated with the measurement cables. ➭ Select the Temp RTD or Temp TC calibration function with the rotary switch. ➭ Switch the calibrator on by pressing the ON / OFF | LIGHT key. The last selected temperature sensor is displayed.
6.1 Temperature Simulation for Resistance Temperature Detectors – RTD setting for temperature Resistance temperature detectors (types Pt100, Pt1000, Ni100 and Ni1000) are simulated by means of resistance values. 6.2 Temperature Simulation for Thermocouples – TC Temperature Setting Thermocouples (types B, E, J, K, L, N, R, S, T and U) are simulated with voltage. Internal or external temperature compensation is possible. Abbreviated Instructions Select the calibration function.
a) The device to be calibrated is connected to the jacks at the calibrator with equalizing leads for the thermocouple to be simulated. b) The temperature of the thermocouple connector jack at the device to be calibrated is measured with a precision temperature measuring instrument, and the resulting value is entered to the calibrator as a reference temperature. The calibrator and the device to be calibrated are connected with copper wire.
7 Current Source and Current Sink [mA] ➭ Connect the device to be calibrated with the measurement cables (see example in section 7.1). ➭ Select the mA current sink ( ) or mA current source ( ) calibration function with the rotary switch. ➭ Switch the calibrator on by pressing the ON / OFF | LIGHT key. The last selected current range is displayed.
7.1 Current Sink – Simulation of a 2-Wire Transmitter A current sink (0 … 24 mA) or current loop load can be simulated with this function. The calibrator regulates the current, which flows via the calibrator jacks from an external power supply independent of direct voltage applied to the jacks (4 … 27 V). The calibrator varies internal resistance such that the selected current value is maintained. Note! The last selected simulation range is saved to memory.
8 Interval Functions, Ramp Functions and Procedures Two types of setpoint sequences can be generated in order to simulate sensor conditions at the inputs of transducers, transmitters and buffer amplifiers: • Interval sequences (see section 8.1) Automatic (periodic) or manually controlled sequences or • Ramp sequences (see section 8.
Example of a Manually Controlled Interval Sequence Setting the Interval Parameters ZERO/SEL ESC Initial value: seleCt range 1nt start 300 mV … 15 V 1nt 02.000 V 10.000 V Final value: 1nt end Steps: 1nt steps 03.0 Dwell time: 1nt t1 Repetition: 1nt mode 00.05 min.
Automatic Interval Sequence Automatic execution of a programmed sequence range is above all advisable if feeding to a signal circuit and scanning of the peripheral device under test are physically separated. After entering all parameters for the “automatic interval sequence” output function (see above) (Int, mode = auto), the sequence can be started and stopped whenever desired, as well as resumed.
8.2 Read-Out a Periodic Ramp – RAMP Function Ramp-type signals can be used to test the dynamic performance of devices to be calibrated, or entire measuring circuits. An example would be performance of a control loop with a setpoint specified via the analog setpoint input at the controller. The instrument can be used to replace costly hardware and software for the setup of long-term test bays with cyclical time sequences.
Setting Ramp Parameters ZERO/SEL ESC seleCt range Example of a Periodic Ramp Sequence Controlled by Manual Intervention 300 mV … 15 V ramp LCD: 10 V Initial value: ramp start 02.000 V OUT ENTER Final value: ramp end 10.000 V OUT ENTER Rise time: ramp t1 00.05 min.s OUT ENTER Dwell time: ramp t2 00.08 min.s OUT ENTER Decay time: ramp t3 00.05 min.
9 Device and Calibration Parameters The instrument’s “SET” mode (menu mode) makes it possible to set operating and measuring parameters, query information and activate the interface. ➭ The menu mode is accessed by pressing the MEAS/CAL | SETUP key, assuming that the instrument is switched on and set to “Measure” (measuring mode operation). “inFo” appears at the display.
9.1 Querying Parameters – InFo Menu bAtt – query battery voltage MEAS/CAL SETUP inFo OUT ENTER bAtt 3.1 V. tiME / dAtE – query date and time MEAS/CAL SETUP inFo OUT ENTER bAtt ... 02.01.200813:46:56 DD.MM.YYYY hh:mm:ss D = day, M = month, Y = year, h = hour, m = minute, s = second Date and time must be reentered after replacing the batteries. cALdAt – query calibration date MEAS/CAL SETUP inFo OUT ENTER bAtt ... caldat 02.01.08 uEr 0..
Addr – set device address tEMP – °C / °F setting, select internal/external reference temperature See section 10.2 regarding settings. See section 6 regarding selection. irStb – status of the infrared receiver in the stand-by mode 9.3 Default Settings Previously entered changes can be undone, and the default settings can be reactivated.
10 Interface Operation (with selector switch setting ≠ OFF) The calibrator is equipped with an infrared interface for communication with the PC. Commands are optically transferred through the instrument housing by means of infrared light to an interface adapter (accessory) which is attached to the calibrator. The adapter’s USB interface allows for connection to the PC with an interface cable. Commands and parameters can be transmitted from the PC to the calibrator.
11 Technical Data Simulator for Temperature Sensors (resolution: 0.1 K) Simulation Range Direct Voltage Source Minimum Load Resistance 0…±300 mV V Intrinsic Uncertainty 0.01 mV 0… 3 V 0.1 mV 0 … 10 V 1 mV 0 … 15 V 1 mV 1 kΩ ±(% S + mV) Overload Imax 1 kΩ –60 …+180 –76 …+356 0.1 + 0.2 18 mA 16 V 0.05 + 2 Current Sink ±(% S + μA) Umax 0.05 + 2 27 V 4 … 20 mA Vin = 4 ... 27 V 0 … 24 mA 5 … 2000 Ω Sensor current [mA] 0.1 Ω ±(% S + Ω) 0.05...0.1..4...5 0.05 + 0.
Additional Error for Thermocouple Simulation Internal clock Time format Resolution Accuracy Temperature Influence DD.MM.YYYY hh:mm:ss 0.1 s ±1 minute per month 50 ppm / K Reference Conditions Ambient temperature Relative humidity Battery voltage +23 °C ±2 K 40 ... 75% 3.0 V ±10 % Thermocouple Simulation Error [°C] Thermocouple error is specified in the technical data as thermovoltage error: ΔU. ΔT error is dependent upon characteristic thermocouple slope.
Display LCD panel (65 mm x 36 mm) with digital display including simulation unit of measure and various special functions Background Illumination Background illumination is switched off approximately 1 minute after it has been activated. Display / Char. Height 7-segment characters Main display: 1 x 6 digits, 12 mm Auxiliary displays: 2 x 6 digits, 7 mm Max.
Data Interface Type Data transmission Protocol Baud rate Functions Optical via infrared light through the housing Serial, bidirectional (not IrDa compatible) Device specific 38,400 baud Set/query calibration functions and parameters. The USB X-TRA plug-in interface adapter (see accessories) is used for adaptation to the PC’s USB port. Ambient Conditions Accuracy range Operating temp. range Storage temp. range Relative humidity Elevation 0 °C ... +40 °C −10 °C ... +50 °C −25 °C ...
12 Maintenance ! Attention! Disconnect the instrument from the device to be calibrated before opening to replace batteries or fuses! Charge Level The current battery charge level can be queried in the “1nfo” menu: MEAS/CAL SETUP info OUT ENTER bAtt 2.7 V 12.1 Displays – Error Messages Message Meaning FUSE Blown fuse Battery voltage has fallen below 1.8 V 12.
Replacing the Batteries ! Attention! Disconnect the instrument from the device to be calibrated before opening the battery compartment lid when replacing the batteries. ➭ Set the instrument face down onto the working surface. ➭ Turn the slotted screw on the lid with the battery symbols counterclockwise. ➭ Lift off the lid and remove the batteries from the battery compartment. ➭ Insert two new 1.
Note! Testing the Fuse with the Instrument Switched On After inserting the fuse with the instrument switched on, it must be switched off briefly and then switched back on again. If contact is poor or the fuse is blown, FUSE blinks at the display. 13 Calibrator Messages The following messages appear at the main or the auxiliary displays as required. See page 3 for messages displayed at visible segments. Message 12.4 Housing Maintenance No special maintenance is required for the housing.
14 Accessories 14.1 General The extensive accessories available for our measuring instruments and calibrators are checked for compliance with currently valid safety regulations at regular intervals, and are expanded as required for new applications.
14.4 USB X-TRA Bidirectional Interface Adapter This adapter makes it possible to connect the calibrator to a USB port at a PC. The adapter allows for data transmission between the calibrator and the PC. 14.5 METRAwin 90 Software METRAwin 90 calibration software is a multilingual program* for controlling various calibrators for electrical quantities with the help of a PC, and for documenting calibration results.
15 Repair and Replacement Parts Service Calibration Center * and Rental Instrument Service If required please contact: GMC-I Service GmbH Service Center Thomas-Mann-Str. 20 90471 Nuremberg, Germany Phone: +49 911 817718-0 Fax: +49 911 817718-253 E-mail service@gossenmetrawatt.com www.gmci-service.com This address is only valid in Germany. Please contact our representatives or subsidiaries for service in other countries.
16 Guarantee All METRA HIT digital multimeters and calibration instruments are guaranteed for a period of 3 years after shipment. The manufacturer’s guarantee covers materials and workmanship. Damages resulting from use for any other than the intended purpose or operating errors, as well as any and all consequential damages, are excluded. The calibration certificate confirms that the product conformed to the specified technical data at the time of calibration.
Prepared in Germany • Subject to change without notice • PDF version available from the Internet GMC-I Messtechnik GmbH Südwestpark 15 90449 Nürnberg • Germany Phone: +49-911 8602-111 Fax: +49 911 8602-777 E-Mail: info@gossenmetrawatt.com www.gossenmetrawatt.
