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Meatest M550 User Manual
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Meatest M550 User Manual

Impedance calibrator
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Summary of Contents for Meatest M550

  • Page 5 Practically this bank can be used in four-wire (4W) or two-wire (2W) measurements. M550 has a built-in test signal level meter which can be easily used for verification of test signal voltage, current and frequency. Color LCD display shows parameters of a selected standard, set-up configuration, calibration data accuracy and other useful information.
  • Page 6 Main control segments of the calibrator are: 1. Output terminals – Calibrator contains two sets of output terminals. Both sets are electrically isolated from each other. 4TP – coaxial BNC output for calibration of BNC terminal LCR meters. Shielding of the BNC connectors is isolated and connected together inside the bank of standards in one point to obtain the lowest frequency dependency.
  • Page 7 characters and changing the selected character’s value. Arrow icons above and below the selected digit indicate which of the two modes are active. 8. Soft keys - There are five buttons below the display, which meaning changes depending on the content of the display.
  • Page 8 Calculated test current Common rules are used for an applied color of labels and values. Red color is applied, when displayed value is measured by M550 calibrator. Blue color is applied for parameters or values, which can be set up or modified Black color is used for fixed values, labels, notes, parameters which cannot be modified and for other fixed text with a general information purpose.
  • Page 9 When controlled remotely, maximum ratings of calibrator’s output signals as well as all other specifications are the same as in manual mode. Meatest software package WinQbase + Caliber is recommended for best automation results. This system is designed for automated and semi automated calibrations of digital and analogue meters including uncertainty calculation, result evaluation and certificate printing according to ISO 17025 standard.
  • Page 10 Inspect package contents when unboxing the calibrator for the first time. See chapter 1.3 for complete list of accessories. Place the instrument on a level surface before powering on and let it stabilize for at least one hour if the instrument has been stored outside of reference temperatures beforehand.
  • Page 11 Plug one end of the power cord into connector on the rear panel and connect the other end of the power cord into a wall outlet. Turn the calibrator on with mains switch right next to it. The calibrator performs internal hardware checks for 5 seconds. During initialization label M550 Impedance calibrator is displayed.
  • Page 12 Push the OPER button to switch output terminals on. The selected partial standard is available at the output terminals either coaxial or banana terminal depending on the selected mode 4TP or 4W/2W. Status of the output terminals is shown on the display with following meaning: output terminals OFF output terminals ON If an obvious failure occurs during the operation (e.g.
  • Page 13 Press the MENU button to enter to main system MENU. Submenu contains basic parameters of display and keyboard. - Language Language version of user interface [0 – 15] - Volume [0 – 7] - Brightness - Beeper [On/Off] - Phase unit [deg/rad] - Password setting Sets new calibration password...
  • Page 14 Important factor in impedance calibration is correct connection of test cables between source of standard value (like M550 calibrator) and DUT. Four cables typically used for the connection have specific purpose and must not be swapped. M550 operation manual uses for description symbols H however some LCR meter manufacturers use different symbols.
  • Page 15 Inductance bank does not contain any physical inductors. All inductance values are simulated using T network of RC type guard and quality factor Q = ω*C*R/2. Application of simulated with simulated serial inductance value L = C *R inductance standards is limited to LCR meters which use four terminal pair technique (4TP). Partial standards are connected to the output terminals using signal relays which switch both signal and shielding wire in all four terminals H .
  • Page 16 Note: LOAD correction makes sense to use only if DUT – LCR meter is equipped with LOAD correction function. There is no difference in connection between CORR ON and CORR OFF in M550. The only difference is in displayed calibration values.
  • Page 17 (SHORT) and high impedance range (OPEN). To simplify calibration of LCR meters M550 calibrator is equipped with both of these reference positions enabling compensation without disconnection of DUT to M550. The positions can be selected by pushing the buttons OPEN or SHORT.
  • Page 18 By pushing the button Meter ON in System buttons field internal voltmeter & counter can be temporarily activated to measure DUT test signal level. After pushing the button the meter is connected for approx. 5 – L second to the H output terminals.
  • Page 19 The four–terminal pair method is applied in many LCR meters which use coaxial inputs. It solves problems with mutual coupling among test cables. The reverse test current flows through shielding of the current coaxial cables and so it eliminates an effect of the magnetic flow, arising as measuring current flow though inner current conductors sequence.
  • Page 20 4. Select requested bank of standards using R, L, C buttons 5. Select requested partial standards using either rotary button or numerical keypad 6. Select requested pair of parameters and frequency in M550. Optionally, use test signal level meter to measure test frequency, see chapter 5.4. for details.
  • Page 21 4. Select requested bank of standards using R, L, C buttons 5. Select requested partial standards using either rotary button or numerical keypad 6. Select requested pair of parameters and frequency in M550. Optionally, use test signal level meter to measure test frequency, see chapter 5.4. for details.
  • Page 22 SHORT) at all in this mode. Partial standards are suitable for application only bellow 1 kHz. DUT LCR meter 1. Connect LCR meter to M550 calibrator using two banana-banana test cables. Use M550 4W/2W output. Make sure to connect corresponding terminals (H ) correctly.
  • Page 23 Test signal voltage and frequency can be measured directly when M550 meter of test signal level meter is activated. Activation can be setup in SETUP menu. 1. Push the button METER ON. M550 starts to measure test signal. 2. Test voltage line on M550 display becomes red indicating in this way that test signal level measurement is in process.
  • Page 24 Ensure the calibrator has been in a temperature suitable environment for at least one hour before starting the verification process. If you don’t have the necessary equipment or can’t do the calibration on your own, please ask local Meatest representative to help you calibrate this device.
  • Page 25 Connect standard LCR meter to the M550 4TP output terminals. Use four terminal coaxial connection. Set test frequency 1 kHz, test voltage 1 V. Set SHORT position in M550 and make SHORT correction in the standard LCR meter. Set OPEN position in M550 and make OPEN correction in the standard LCR meter.
  • Page 26 Connect standard multimeter to the M550 4/2W output terminals. Use four single banana-banana test leads. Connect them as follows: Standard multimeter M550 + SENSE - SENSE - Use four terminal connection, set the most accurate mode of four terminal resistance measurement in the multimeter, TRUE RMS mode - Set 4W mode in M550.
  • Page 27 Connect standard LCR meter to the M550 4/2W output terminals. Use four terminal Kelvin cable adapter from standard LCR meter accessory. Connect the clips to H and L terminals. When autobalance bridge is applied for 4W verification, connect standard LCR meter terminals to M550 4/2W output according to following picture.
  • Page 28 Connect standard multimeter to the M550 4/2W output terminals. Use four single banana - banana test leads. Connect them as follows: Standard multimeter M550 + SENSE - SENSE - Use four terminal connection, set the most accurate mode of four terminal resistance measurement in the multimeter, TRUE RMS mode.
  • Page 29 Connect standard LCR meter to the M550 4/2W output terminals. Use Kelvin cable adapter from standard LCR meter accessory. Connect the clips to H and L terminals. If the adapter is not available, use connection according to following picture. To M550...
  • Page 30 The impedance calibrator requires periodical recalibration. Recommended recalibration interval is 1 year. The recalibration process is based on measuring of M550 partial standards using either direct method of measurement with standard LCR meter and standard multimeter or using comparison method with set of single standard resistors, capacitors and inductors of decimal nominal values and entering and saving new calibration values.
  • Page 31 Calibration structure consists of three calibration levels: - Selection of type of calibration - Selection of mode (type of connection) 4TP or 4W/2W and standard bank R or C or L - Individual partial standard selection Select either Full or Offset calibration. - Full calibration The item enables to modify both complex calibration values (primary and secondary) of all R, C, L partial standards, and reference positions SHORT/OPEN as well in spot frequencies.
  • Page 32 - Full scale calibration Access to recalibration of full-scale point. M550 Impedance calibrator is equipped with memory of history of calibration values of partial standards. Calibrator records and keeps past calibration values of primary and secondary parameters at frequency 1 kHz.
  • Page 33 Maximum number of stored calibration pairs is 30 records per standard. When maximum number is being crossed over during calibration, calibrator deletes the oldest calibration parameter pair and adds the newest one. Warning is displayed before deleting the old data with option to delete it or not to save the new calibration values.
  • Page 34 1. Push MENU button, select CALIBRATION item. 2. Select DISCRETE STANDARD CALIBRATION 3. Select FULL CALIBRATION in next step 4. Select type of bank (resistance, capacitance, inductance) and type of connection (4TP, 4W or 2W) 5. Select nominal value of partial standard which calibration values are requested to modify. 6.
  • Page 35 1. Select 4TP mode. Use BNC-banana adapters. Switch output terminals ON – L 2. Make short between H terminals 3. Push MENU button, select CALIBRATION item. 4. Select METER CALIBRATION 5. Select ZERO CALIBRATION 6. Screen with ZERO point calibration appears. Live reading of internal voltmeter in digits is displayed. Push the WRITE soft button to save ZERO calibration value.
  • Page 36 This chapter explains how to perform the routine maintenance to keep your device in optimal operating conditions. Replace the fuses as follows: - Unplug the power cord from the Calibrator. - Locate the fuse holder which is a part of power line entry module on the rest panel. Of the calibrator. - Inserting a flat-blade screwdriver in the slot in the end of the fuse holder, remove the fuse holder from the module.
  • Page 37 Bellow shown accuracy is valid after specified warm-up time in temperature range 23 ± 2 °C. The accuracy includes long-term stability, temperature coefficient, linearity, load and line regulation and the traceability of factory and National calibration standards. Specified accuracy is valid for one year after the last calibration. Specified accuracy „of range“...
  • Page 38 0.1 Ω to 100 MΩ Range fix decimal values in 4TP mode 0.1 Ω to 100 MΩ fix decimal values in 4W mode 1 Ω to 10 MΩ fix decimal values in 2W mode Deviation to nominal value 0.05 % to 10 % depending on value, mode and frequency Calibration uncertainty 0.02 % to 2 % at 1 kHz depending on value and mode Temperature coefficient...
  • Page 39                              ...
  • Page 40          ...
  • Page 41                   ...
  • Page 42      ...
  • Page 44 Typical 1 year stability: 0.01% 0.005 % / C Maximal temperature coefficient Tk: Maximal deviation to nom. val. at 1 kHz:...
  • Page 46                    ...
  • Page 47           Maximal deviation: Nominal value at 1 kHz (4W – CORR OFF):                 ...
  • Page 48    OPEN 4TP Residual capacitance < 0.5 pF at 10 kHz 4TP Residual conductance < 10 nS at 10 kHz 4W Residual capacitance < 40 pF at 1 kHz 4W Residual conductance < 10 nS at 1 kHz <...
  • Page 49 1. Calibration values define impedance parameters of internal partial standards. They do not cover potential additional deviations caused by test cables between DUT and M550 calibrator. 2. Calibration uncertainty is specified for temperature range 23 °C ± 2 °C and for RH < 80 % working condition.
  • Page 50 According to EN ISO/IEC 17050-1:2010 standard as well as 2014/30/EU and 2014/35/EU directives of European Parliament and European Council, MEATEST, spol. s r. o., manufacturer of M550 Impedance Calibrator, based in Železná 3, 619 00 Brno, Czech Republic, declares that its product conforms to following specifications: - EN 61010-1 ed.