MC1200 Reference Manual
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Standard Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 . . . . . . . . . . . . .3 . . . . . . . . . . . . .3 . . . . . . . .
1. Introduction The Martel MC1200 Multifunction Process Calibrator is a handheld, battery-operated instrument that measures and sources electrical and physical parameters. The calibrator has the following features and functions: • A dual display. The upper display is used for the measurement of volts, current, and pressure.
1.3 Safety information Symbols Used The following table lists the International Electrical Symbols. Some or all of these symbols may be used on the instrument or in this manual. Symbol Description AC (Alternating Current) AC-DC Battery CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface (Burn Hazard) Read the User’s Manual (Important Information) Off On Canadian Standards Association The following definitions apply to the terms “Warning” and “Caution”.
Warning To avoid possible electric shock or personal injury: • Do not apply more than the rated voltage. See specifications for supported ranges. • Follow all equipment safety procedures. • Never touch the probe to a voltage source when the test leads are plugged into the current terminals. • Do not use the calibrator if it is damaged. Before you use the calibrator, inspect the case. Look for cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors.
2. Calibrator Interface Figure 1 shows the location of the input and output connections on the calibrator, while Table 1 describes their use. Figure 1. Input/Output Terminals Table 1: Input and Output Terminals 6 No. Name Description 1, 2 Measure Isolated V, mA terminals Input terminals for measuring current, voltage, and supplying loop power. 3 TC input/output Terminal for measuring, or simulating thermocouples. Accepts miniature polarized thermocouple plugs with flat in-line blades spaced 7.
Figure 2 shows the location of the keys on the calibrator. Table 2 lists the functions of each key. Figure 2. Keypad Table 2. Key Functions No. Name Function 1 Function Keys F1, F2, F3 Used to operate the menu bar at the bottom of the calibrator display. F1 is used for selecting options in the left box, F2 for the center box, and F3 for the right box. 2 Home Returns to home menu on the menu bar. 3 Power Turns calibrator on and off.
The display of the calibrator, shown in Figure 3, is divided into three main sections: the upper display, the lower display, and the menu bar. The upper display is used for measuring dc voltage, dc current with and without loop power, and pressure. The lower display can be used for both measuring and sourcing. The menu bar is used to setup both the upper and the lower display to perform the desired function. Table 3 explains the different parts of the display: Table 3: Display Functions No.
In the input home menu the only active options are [MENU] and [LIGHT]. The [MENU] option is used to enter the next level of the menu bar, the main menu. Press the corresponding function key (F1) to enter the main menu. The [LIGHT] option is used to turn on the LCD back light. Press the corresponding function key (F2) to turn on the back light. In the output home menu there are three active options, [MENU], [LIGHT] and [STEP] or [RAMP]. The first two options work the same as in the input home menu.
1. Turn on the unit while holding down the “HOME” key. 2. Hold the key down for a count of 10 seconds to restore contrast default settings. If the display is so dim that you cannot tell if the unit is on or off, use the backlight key to determine if the power is on or off. The auto off main menu contains the options [AUTO OFF], [NEXT], and [DONE]. The [AUTO OFF] option is used to turn the automatic shutoff on and off and set the amount of time the unit needs to stay dormant to shut off.
2.3 Cursor control / Setpoint control The output value can be controlled by the four cursor control arrows on the keypad. By pressing one of the arrows a cursor will be added to the display under the last digit of the output value. The left and right arrow keys are used to select which decade to be changed in the output value. The up and down arrow keys are used to increase, decrease, or ramp the output value. The menu bar will change to the setpoint menu with the touch of any one of the four arrow keys.
3. Using Measure Modes (Lower Display) 3.1 Measuring volts and frequency Electrical parameters volts and frequency can be measured using the lower display. To make the desired measurements, follow these steps: 1. Switch to the lower display [LOWER] from Main Menu. 2. Select the desired parameter for measurement. 3. Connect leads as shown in Figure 5. Figure 5. Measuring Volts and Frequency with Input/Output Terminals 3.2 Measuring mA To measure mA follow these steps: 1.
3.3 Measuring Temperature 3.3-1 Using Thermocouples The calibrator supports the following thermocouple types: B, C, E, J, K, L, N, R, S, T, U, BP, and XK. The characteristics of all the types are described in Specifications section. The calibrator also has a Cold Junction Compensation (CJC) function. Normally this function should be ON and the actual temperature of the thermocouple will be measured.
3. Choose 2, 3, or 4-wire connection [2W, 3W, 4W]. (4-wire allows for the most precise measurement) 4. Select RTD type from the sensor types. 5. Attach RTD leads as shown in Figure 8. Figure 8. Measuring Temperature with RTD Connection Resistance can also be measured using this function. To do so, use the above procedure and choose OHMS from the sensor types. This option can be used along with a table to measure an RTD which is not programmed into the calibrator. 3.
To measure pressure, follow these steps: 1. Connect the pressure module to the calibrator as shown in Figure 9. using the 700mA pressure module adapter. The calibrator can measure pressure on both the upper and the lower display. This makes it possible to measure pressure in two different units at the same time. Note: Make sure the calibrator is on before you plug in the pressure module. 2. Switch to either upper or lower display from the Main Menu. 3. Select [PRESSURE] from the primary parameters. 4.
4. Using Source Modes (Lower Display) The calibrator can generate calibrated signals for testing and calibrating process instruments. It can source voltages, currents, resistances, frequencies, pulses, and the electrical output of RTD and thermocouple temperature sensors. 4.1 Setting 0% and 100% Output Parameters To set the 0% and 100% points, use the following steps: 1. Select the lower display [LOWER] from Main Menu, and choose the desired primary parameter. 2.
Figure 10. Connections for Sourcing Current 4.3-1 HART™ Resistor Selection The MC1200 can be set-up so that the 250 ohm resistor required for Hart™ configuration devices resides inside the MC1200. Enabling the MC1200's internal 250 ohm resistor eliminates the need to manually add a series resistor during a Hart™ calibration process. NOTE: When the MC1200's internal 250 resistor is enabled, maximum load driving capability drops from 1000 ohms @ 20mA to 750 ohms @20mA. Enable/Disable Procedure 1.
4.4 Simulating a Transmitter To have the calibrator supply a variable test current to a loop in place of a transmitter, follow these steps: 1. Select lower display from the Main Menu. 2. Choose mA simulation from the primary parameters [mA 2W SIM], and enter the desired current. 3. Connect the 24V loop as shown in Figure 11. Figure 11. Connections for Simulating a Transmitter 4.5 Sourcing volts To source volts follow these steps: 1. Select lower display from the Main Menu. 2.
4.6 Sourcing frequency To source a signal use these steps: 1. Switch to the lower display and select frequency from the primary parameters. 2. Select output, and than choose the frequency units. 3. Connect the leads to the frequency output terminals as shown in Figure 12. 4. Enter the desired frequency using the keypad. 5. To change the amplitude, select [FREQ LEVEL] from frequency level menu. 6. Enter the amplitude. 4.
Figure 13. Connections for Outputting Thermocouples 4.8 Sourcing Thermocouples To source a thermocouple use the following steps: 1. Connect the thermocouple leads to the appropriate polarized TC miniplug, and insert the plug into the TC terminals on the calibrator, as shown in Figure 13. 2. Select lower display from the Main Menu, and choose thermocouple [TC] from the primary parameters. 3. Choose output [OUT] from the input/output control. 4. Select the desired thermocouple type from the sensor types. 5.
4.9 Sourcing Ohms/RTDs To source an RTD, follow these steps: 1. Select lower display from the Main Menu, and choose [RTD] from the primary parameters. 2. Choose output [OUT] from the input/output control, and select RTD type from the sensor types. 3. Connect the calibrator to the instrument being tested, as in Figure 14. 4. Enter the temperature or resistance using the keypad. Figure 15. Using a 3- or 4-wire Connection for RTDs Note: The calibrator simulates a 2-wire RTD.
temperature, maximum temperature, R0, and the values for each of the temperature coefficients. The custom function uses the Calendar-Van Dusen equation for outputting and measuring custom RTDs. The coefficient C is only used for temperatures below 0°C. Only A and B coefficients are needed for the range above 0°C, so coefficient C should be set to 0. The R0 is the resistance of the probe at 0°C. The coefficients for PT385, PT3926, and PT3616 are shown in Table 4 below. Table 4.
Figure 17. Connection Using Current Loop 5.2-1 HART™ Resistor Selection The MC1200 can be set-up so that the 250 ohm resistor required for Hart™ configuration devices resides inside the MC1200. Enabling the MC1200's internal 250 ohm resistor eliminates the need to manually add a series resistor during a Hart™ calibration process. NOTE: When the MC1200's internal 250 resistor is enabled, maximum load driving capability drops from 1000 ohms @ 20mA to 750 ohms @20mA. Enable/Disable Procedure 1.
Warning! To avoid a violent release of pressure in a pressurized system, shut off the valve and slowly bleed off the pressure before you attach the pressure module to the pressure line. Caution To avoid mechanically damaging the pressure module, never apply more than 10 ft-lb. of torque between the pressure module fittings, or between the fittings an the body of the module. To avoid damaging the pressure module from overpressure, never apply pressure above the rated maximum printed on the module.
6. Using the Upper and the Lower Display for Calibration and Testing 6.1 Testing an Input or Indicating Device To test and calibrate actuators, recording, and indicating devices using the source functions, follow these steps: 1. Select the lower display and choose the correct primary parameter. 2. Switch to [OUT] in the input/output control. 3. Connect the leads to the instrument and the calibrator as shown in Figure 19. Figure 19. Connections for Testing an Output Device 6.
6.3 Calibrating a Transmitter To calibrate a transmitter both the upper and the lower displays will be used; one for measuring and the second a source. This section covers all but the pressure transmitters. A thermocouple temperature transmitter is used in this example. The following steps show how to calibrate a temperature transmitter: 1. From the Main Menu select upper display, and choose current loop [mA LOOP]. 2. Switch to lower display from the Main Menu, and select [TC] from the primary parameters.
Figure 22. Calibrating a Pressure Transmitter 7. Remote Operation The calibrator can be remotely controlled using a PC terminal, or by a computer program running the calibrator in an automated system. It uses an RS-232 serial port connection for remote operation. With this connection the user can write programs on the PC, with Windows languages like Visual Basic to operate the calibrator, or use a Windows terminal, such as Hyper Terminal, to enter single commands.
Serial parameter values: 9600 baud 8 data bits 1 stop bit no parity Xon/Xoff EOL (End of Line) character or CR (Carriage Return) or both To set up remote operation of the calibrator on the Windows Hyper Terminal, connected to a COM port on the PC as in Figure 23, use the following procedure: 1. Start Hyper Terminal (located in Accessories/Communications of the Windows Start menu) 2. Select New Connection. 3. For Name enter ASC300. Select the serial port that the unit is connected to. 4.
Calibrator Commands Only the calibrator uses these commands. For example LOWER_MEAS DCV tells the calibrator to measure voltage on the lower display. Common Commands Standard commands used by most devices. These commands always begin with an "*". For example *IDN? tells the calibrator to return its identification. Query Commands Commands that ask for information. They always end with a "?". For example: FUNC? Returns the current modes of the upper and lower displays.
7.3-2 Character Processing The data entered into the calibrator is processed as follows: • ASCII characters are discarded if their decimal equivalent is less than 32 (space), except 10 (LF) and 13 (CR): • Data is taken as 7-bit ASCII • The most significant data bit is ignored. • Upper or lower case is acceptable. 7.3-3 Response Data Types The data returned by the calibrator can be divided into four types: Integer For most computers and controllers they are decimal numbers ranging from -32768 to 32768.
Service Request Enable Register (SRE) Enables or disables the bits of the STB. Cleared when power is reset. Setting bits to 0 disables them in the STB. Setting the bits to 1 enables them. Bit assignments for the SRE and the STB are shown below. 7 6 5 4 3 2 1 0 0 MSS ESB 0 EAV 0 0 0 MSS Master Summary Status. Set to 1 when ESB or EAV are 1 (enabled). Read using the *STB? command. ESB Set to 1 when at least one bit in ESR is 1. EAV Error Available.
CME Command Error. Set to 1 when the calibrator receives an invalid command. Entering an unsupported RTD type may cause such an error. EXE Execution Error. Set to 1 when the calibrator runs into an error while executing is last command. A parameter that has too significant figures may cause such an error. DDE Device-dependent Error. Set to 1 when, for example, the output of the calibrator is overloaded. QYE Query Error. OPC Operation Complete.
Table 5: Common Commands Command Description *CLS *CLS (Clear status.) Clears the ESR, the error queue, and the RQS bit in the status byte. Terminates pending Operation Complete commands *ESE Loads a byte into the Event Status Enable register. *ESE? Returns the contents of the Event Status Enable register. *ESR? Returns the contents of the Event Status register and clears the register. *IDN? Identification query.
Command FREQ_TYPE Description Set the frequency output to continuous (frequency) or pulse.
Table 7: Parameter units Units Meaning MA milliamps of current MV Voltage in millivolts V Voltage in volts CPM Frequency in cycles per minute Hz Frequency in Hertz KHz Frequency in kiloHertz Ohms Resistance in Ohms Cel Temperature in Celsius Far Temperature in Fahrenheit Psi Pressure in pounds per square-inch InH2O4C Pressure in inches of water at 4°C InH2O20C Pressure in inches of water at 20°C CmH2O4C Pressure in centimeters of water at 4°C CmH2O20C Pressure in centimeters of
Error Number Error Description 114 The serial output buffer overflowed 115 Output is overloaded 116 Calibrator not in pulse train mode when TRIG was received 117 An invalid FREQ_TYPE was received 7.5 Entering Commands Commands for the calibrator may be entered in upper or lower case. There is at least one space required between the command and parameter, all other spaces are optional. Almost all commands for the calibrator are sequential, any overlapped commands will be indicated as such.
*OPC Enables the Operation Complete setting in the ESR. This setting makes it possible to check if an operations is complete after it has been initialized. For example this operation could be used with the command TRIG. *OPC? Returns 1 when all operations are complete, and causes program execution to pause until all the operations are complete. For example: TRIG ; *OPC? will return a 1 when the pulse train initiated by TRIG is complete. *RST Resets the state of calibrator to the power-up state.
CJC_STATE Turns Cold Junction Compensation (CJC) on or off, when the calibrator is in thermocouple (TC) mode. The command is used by adding ON or OFF after it. For example: CJC_ STATE OFF turns CJC off. CJC_STATE? Tells whether the Cold Junction Compensation in thermocouple mode is turned on or turned off. The calibrator returns OFF if CJC is off, and ON if CJC is on. CPRT_COEFA This command is used for entering a custom RTD into the calibrator.
CPRT_COEFC? Returns the number which was entered for the first coefficient of the polynomial used in the custom RTD. Using the example above CPRT_COEFC? Would return: -5.801900E-12 CPRT_MIN_T Sets the minimum temperature of the custom RTD range. The temperature value must be entered with a degrees label, CEL for Celsius and FAR for Fahrenheit. For example: CPRT_MIN_T -260 CEL enters -260°C as the minimum temperature.
103 which is the code number for an entry over range. Refer to the Error Codes table for more information on error code numbers. FREQ_LEVEL Sets the amplitude of the wave used in the Frequency Out and Pulse modes. The range for amplitude entered may be found in the Specifications section. For example: FREQ_LEVEL 5 V sets the amplitude at 5Vpp. FREQ_LEVEL? Returns the amplitude of the wave used in Frequency Out and Pulse modes. FREQ_LEVEL? with the above example would return: 5.
LOCAL Restores the calibrator to local operation if it was in remote mode. Also clears LOCKOUT if the unit was in lockout mode. LOWER_MEAS Sets the lower display to measure mode. The command is followed by any of the parameters except for pulse and mA sim, which are source only. Enter DCI for mA, DCV for volts, TC for thermocouple, RTD for RTD, FREQUENCY for frequency, and PRESSURE for pressure.
PULSE_CNT Sets the number of pulses the calibrator will produce when it is triggered while in pulse mode. For example; PULSE_CNT 3000 will set the number of pulses to 3000. PULSE_CNT? Returns the number of pulses in the pulse train. Using the above example, the returned value would be: 3000 REMOTE Puts the calibrator in remote mode. From the remote mode the user can still use the keypad to get back to local unless the command LOCKOUT was entered before REMOTE.
SIM Sets the output for current simulation. This command also switches the calibrator into mA simulation mode. A number and a unit must be entered after the command. For example: SIM 5 MA sets the current simulation at 5 mA SIM? Returns the output of the current simulation. With the example above, the output would be: 5.000000E-03, A TC_TYPE Sets the type of the thermocouple. All available types are shown in the TC Types table in Section 8. (Specifications).
TSENS_TYPE? Returns the type of sensor that is currently set to measure temperature, either TC or RTD. UPPER_MEAS Sets the measuring mode for the upper display. After the command enter DCI for mA, DCI_LOOP for mA with loop power, DCV for volts, and PRESSURE for pressure. For example: UPPER_MEAS DCV sets the upper display to measure volts U_PRES_UNIT Sets the unit for measuring pressure on the upper display. Add the unit after the command. The available pressure units and their syntax are shown in Table 7.
8. Specifications All measurements apply at 23°C ± 5°C. unless specified otherwise. Outside of this range the stability of the measurements is ± 0.005%of reading/°C. Table 9: General Specifications Operating Temperature -10°C to 50° Storage Temperature -20°C to 70°C Power 4 X AA batteries; Alkaline or optional rechargeable Low battery warning Yes Serial Communications Yes, ASCII CE - EMC EN50082-1: 1992 and EN55022: 1994 Class B Safety CSA C22.2 No. 1010.
Table 13: Resistance Measurement Range Accuracy(% of reading ± floor) Ohms low 0.00Ω - 400.0Ω 0.025% ± 0.05Ω Ohms high 401.0Ω - 4000.0Ω 0.025% ± 0.5Ω Table 14: Resistance Source Range Ohms low Ohms high Excitation Current Accuracy(% of reading ± floor) 5.0Ω - 400.0Ω 0.1mA - 0.5mA 0.025% ± 0.1Ω 5.0Ω - 400.0Ω 0.5mA - 3mA 0.025% ± 0.05Ω 400Ω - 1500Ω 0.05mA - 0.8mA 0.025% ± 0.5Ω 1500Ω - 4000Ω 0.05mA - 0.4mA 0.025% ± 0.5Ω Note: Unit is compatible with smart transmitters and PLCs.
TC type Range (°C) U -200.0 - 0.0 0.0 - 600.0 N -200.0 - 0.0 0.0 - 1300.0 Accuracy 0.5 0.25 0.8 0.4 All TC errors include CJC errors CJC error outside of 23 ± 5°C is 0.05°C/°C (In °C add .2 for cold junction compensation error.) Table 17: RTD Read and Source RTD Type Ni120 (672) Cu10 Cu50 Cu100 YSI400 Pt100 (385) Pt200 (385) Pt500 (385) Pt1000 (385) Pt385-10 Pt385-50 Pt100 (3926) Pt100 (3916) Range (°C) -80.0 - 260.0 -100.0 - 260.0 -180.0 - 200.0 -180.0 - 200.0 15.00 - 50.00 -200.0 - 100.
9. Maintenance / Warranty 9.1 Replacing Batteries Replace batteries as soon as the battery indicator turns on to avoid false measurements. If the batteries discharge too deeply the MC1200 will automatically shut down to avoid battery leakage. Note: Use only AA size alkaline batteries or optional rechargeable battery pack. 9.2 Cleaning the Unit Warning To avoid personal injury or damage to the calibrator, use only the specified replacement parts and do not allow water into the case.
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