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Changzhou Chuangkai Electronic Co.,Ltd

                                 

                                       

Edition 

V1.0

 

  18 

 

1.4 Checking the Measurement Target 

To  carry  out  proper  resistance  measurement,  change  the  measurement 

conditions  appropriately  according  to  the  measurement  target.  Before  starting 
measurement,  use  the  examples  recommended  in  the  following  table  to 
configure the instrument. 

 

 

⚫

  When  the  measurement  target  significantly  depends  on  temperature, 

use the temperature correction function. 

⚫

  The  interval  measurement  function  allows  you  to  save  a  measured 

value every fixed interval.   

Summary of Contents for CKT3548

Page 1: ...CKT3548 User s Manual RESISTANCE METER Changzhou Chuangkai Electronic Co Ltd Edition V1 0...

Page 2: ...unction 41 4 3 Compensating for Thermal Effects Temperature Correction TC 42 4 4 Compensating for Thermal EMF Offset Offset Voltage Compensation Function OVC Function 44 4 5 Setting the Delay Time for...

Page 3: ...ings 74 8 1 confirmation screen displays the date and time 74 8 2 calibration clock 75 8 3 initialized reset 76 Chapter 9 Appendix 77 Appx 1 block diagram 77 Appx 2 Four Terminal Voltage Drop Method 7...

Page 4: ...Contents When you receive the instrument inspect it carefully to ensure that no damage occurred during shipping In particular check the accessories panel switches and connectors If damage is evident...

Page 5: ...could result in injury or death as wellas damage to the instrument Be certain that you understand the instructions and precautions in the manual before use Notation This manual contains information a...

Page 6: ...perator or damage to the instrument or malfunction Indicates functions of the instrument or relative suggestion of a correct operation Accuracy We define measurement tolerances in terms of f s full sc...

Page 7: ...ible to vibration Checking before use Before using the instrument the first time verify that it operates normally to ensure that no damage occurred during storage or shipping If you find any damage co...

Page 8: ...ibration or shock during transport or handling Especially be careful not to drop or fall the instrument which will cause shock To avoid any damage to the instrument do not input voltage or current to...

Page 9: ...tandard auto memory and auto hold and optional L2105 LED Comparator Attachment Highly reliable specifications implemented in a compact light weight body 35 000 dgt high resolution 0 1 resolution at 1...

Page 10: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 10 1 2 Component Names and Operation Overview Front Panel Rear Panel Rear panel...

Page 11: ...ializes the measurement conditions SAVE CLEAR key press and hold Saves and clears panels SAvE CLr TC T key Temperature correction conversion function oFF TC T LENGTH key press and hold Length conversi...

Page 12: ...e no indicator memory number MEMORY No key Changes values and items DATE key press and hold Displays the date and time confirmation screen ESC key Cancels the setting when in the setting screen Releas...

Page 13: ...e of the following settings it is necessary to turn the power from off to on while holding down a particular key For details see the indicated page Clearing zero adjustment Switching to a different me...

Page 14: ...re display is lit Displays measurement conditions settings measured values memory numbers MEMORY No panel numbers comparator settings judgment results etc For information on the error display see Erro...

Page 15: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 15 Temperature conversion T measurement screen Interval measurement screen Non measured value display Out of range Current fault...

Page 16: ...is enabled Blinking Zero adjustment is in progress A HOLD The auto hold function is enabled A MEMO The auto memory function is enabled The beeper function is enabled APS The auto power save function...

Page 17: ...n doing the settings for each function COMP Comparator function is enabled PASS The notation appears when the comparator judgement result is confirmed as qualified FAIL The notation appears when the c...

Page 18: ...itions appropriately according to the measurement target Before starting measurement use the examples recommended in the following table to configure the instrument When the measurement target signifi...

Page 19: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 19 1 5 Dimension...

Page 20: ...hing the strap to the instrument allows you to use it with the strap around your neck Follow the procedure below to attach the strap Note Use the four attachment points on the instrument to attach the...

Page 21: ...to reattach the cover Poor performance or damage from battery leakage could result Observe the cautions listed below Do not use both new and old batteries or different types of batteries together Be c...

Page 22: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 22 Lithium battery replacement...

Page 23: ...oid electric shock accident connect the test leads correctly To be safe do not use any test lead other than the ones specified by our company The ends of leads are sharp Be careful to avoid injury Con...

Page 24: ...e POWER key to turn the power on Hold the key down until the entire display turns on Entire display lit A self test is started The model name and version number are displayed during the self test Turn...

Page 25: ...with the previous state used immediately before turning it off Automatic power off with auto power save APS When the instrument is not being used the APS function automatically turns it o to reduce ba...

Page 26: ...while holding the ENTER key down when the power is off The setting of the APS function is not saved When the instrument is turned on again the APS function is enabled again IMPORTANT During an interva...

Page 27: ...he metal exposed If the coating of a test lead is broken the measured value may become unstable or have an error Replace the damaged test lead Power on checking Inspection item Action Is the remaining...

Page 28: ...proximately 2 W may be applied If there are any of the following concerns depending on the level of the measurement current select a range using a lower measurement current The measurement target may...

Page 29: ...the comparator function is turned ON the range is fixed and cannot be changed To change the range turn the comparator function OFF or change the range in the comparator setting Depending on the measu...

Page 30: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 30 3 2 Connecting the Test Leads to the Measurement Target Example Test clip Example Test Probe...

Page 31: ...of a Conductor Length Conversion Function Switching the display Press and hold the VIEW key to switch the type of information displayed on the upper right of the screen Temperature no indicator memor...

Page 32: ...nd if oF is displayed the comparator judgment is Lo In the same manner oF is displayed when the temperature exceeds the measurement range during temperature measurement Current fault or not measured y...

Page 33: ...ge input If an overvoltage is accidentally applied and a fuse is blown replace the fuse Temperature Sensor not connected Temperature cannot be measured as the Temperature Sensor is not connected When...

Page 34: ...nversion function exceeds 999 99 km 2 Current fault detection function Current fault examples The DRIVE or DRIVE probe is open The measurement target has a broken wire open circuit work The DRIVE or D...

Page 35: ...Co Ltd Edition V1 0 35 Save a measured value The storage function helps to verify a measured value later It saves the displayed measured value For more details about the save function see Saving Data...

Page 36: ...led IMPORTANT When the ambient temperature changes or the test leads are replaced after zero adjustment perform zero adjustment again Perform zero adjustment for each range used In the manual range mo...

Page 37: ...zero adjustment 1 Short the test leads Example Test CliP p Correct Incorrect Example Text Probe 2 Confirm that the measured value is within 3 f s If no measured value is displayed make sure that the...

Page 38: ...ent If it is difficult to press the key as the Zero Adjustment Board is used press the 0 ADJ key before shorting the measurement lead Zero adjustment is automatically performed after the measured valu...

Page 39: ...each range or the instrument is in a measurement error state Perform zero adjustment with the correct wire connection again If the resistance is too high e g due to a self made cable zero adjustment...

Page 40: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 40...

Page 41: ...ectronic Co Ltd Edition V1 0 41 4 2 Stabilizing Measured Values Averaging Function This function averages the measurement values in order to display a single value It helps to stabilize fluctuations i...

Page 42: ...he reference temperature to display the converted value For the principles of temperature correction see Appx Temperature Correction Function TC To perform temperature correction connect the Z2002 Tem...

Page 43: ...Chuangkai Electronic Co Ltd Edition V1 0 43 IMPORTANT If the t Err is displayed the Temperature Sensor may not be connected or Of is displayed for the temperature Check the connection of the Temperatu...

Page 44: ...ically compensates for an offset voltage caused by thermal EMF or an internal offset voltage OVC Offset Voltage Compensation See Appx Effect of Thermoelectromotive Force Thermal EMF The function uses...

Page 45: ...et OVC delay value factory default Unit ms Measurement current Range Delay time Lo 3m 30m 200 300m 3 50 30 300 30 Hi 300m 200 IMPORTANT When the offset voltage compensation function is ON the OVC indi...

Page 46: ...ime to approximately ten times the following calculation so that the reactance component inductance or capacitance does not affect the measurement L Measurement target inductance R Measurement target...

Page 47: ...ons It is also useful when performing measurement in an environment with external noise When measurement is performed with the 300 mA measurement current the 300 mA indicator lights up 1 When measurin...

Page 48: ...urement current This is due to an oxide film that is generated around the contact while it is not used Even when it is judged that no abnormality is found using a small current the connection sections...

Page 49: ...ED Comparator Attachment option There are two different judgment methods available ABS mode and REF mode Before using the comparator function If no measured value appears the comparator judgment is di...

Page 50: ...ode Set the upper and lower limit values for judgment as absolute values Example Upper limit value 100 00 m Lower limit value 80 00 m Upper limit value 100 00 m REF relative value judgment mode Set th...

Page 51: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 51 Judging based on upper and lower limit values ABS mode...

Page 52: ...ased on a reference value and allowable range REF mode In REF mode a measured value is displayed as a relative value The upper and lower limit values cannot be set separately IMPORTANT Any setting cha...

Page 53: ...hen upper limit value lower limit value Judging based on a reference value and allowable range REF mode In REF mode a measured value is displayed as a relative value The upper and lower limit values c...

Page 54: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 54 Verifying a judgment with a sound judgment sound function This function sounds the buzzer based on a comparator judgment result...

Page 55: ...T 1 After the motor and coil are stabilized at room temperature measure the resistance R1 and instrument ambient temperature t1 and then input these values to the instrument 2 Disconnect the test lead...

Page 56: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 56 Measurement screen...

Page 57: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 57...

Page 58: ...s a conductor Press and hold the TC T LENGTH key to display the ON OFF setting screen for the length conversion function Example When the measured resistance is 8 and per meter resistance is 100m m Me...

Page 59: ...RTANT The display format decimal point position and unit automatically changes depending on the range and setting For details see the product specifications For some ranges oF is always displayed beca...

Page 60: ...he measurement conditions at any time The panel data is retained even if the instrument is turned off Press the PANEL key to display the panel load screen Press and hold the PANEL SAVE CLEAR key to di...

Page 61: ...e set of current measurement conditions 1 Press the PANEL SAVE CLEAR key 2 Select SAVE 3 Select a panel number 4 Press the ENTER key save and move to the measurement screen IMPORTANT If the already sa...

Page 62: ...ress and hold the PANEL SAVE CLEAR key 2 Select CLEAR 3 Select a panel number 4 Press the ENTER key to delete the panel move to the measurement screen IMPORTANT If the number of a panel that is not sa...

Page 63: ...time measurement value temperature resistance measurement range averaging temperature correction TC temperature conversion T and interval Memory layout Memory block 10 blocks Maximum number of entries...

Page 64: ...Edition V1 0 64 1 Press the M BLOCK key to go to the memory block selection screen 2 Rolling the or key to change the memory block 3 Press the Enter key to move the measurement screen or press the Esc...

Page 65: ...ess any timing to save manual storage Press the ENTER MEMO key to save the displayed measured value The memory number is incremented by one each time data is saved and cannot be specified If data is a...

Page 66: ...and saved Press the MODE key to switch saving mode oFF Auto hold A HOLD Auto memory A HOLD A MEMORY Interval INTERVAL oFF Press the ENTER key to confirm the saving mode press the ESC key to cancel th...

Page 67: ...form a temperature rise test for estimation of power off temperature Press the MODE key to switch the saving mode oFF Auto hold A HOLD Auto memory A HOLD A MEMORY Interval INTERVAL oFF Press the key t...

Page 68: ...on IMPORTANT When an interval measurement starts data is automatically saved in an available free block The memory block used cannot be changed When the interval measurement stops the used memory bloc...

Page 69: ...c Co Ltd Edition V1 0 69 7 4 Display saved measurement data stored display Press the READ key to display the saved measurement data Press the key to change the saved read number Press ENTER or ESC key...

Page 70: ...are three different methods to clear saved measurement data Clearing only the last data latest data saved in a block Clearing an entire block Clearing all Press and hold the READ MEMO CLEAR key to di...

Page 71: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 71 Clearing an entire block of saved data Clearing all...

Page 72: ...the plugs to the instrument and PC Removing the USB cable To remove the USB cable connected to the instrument while the PC is running use the Safely Remove Hardware icon on the PC Install desktop sof...

Page 73: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 73 After the connecting successfully click data to read measurement Click the data export the data can be exported to a CSV file...

Page 74: ...ctronic Co Ltd Edition V1 0 74 Chapter 8 System Settings 8 1 confirmation screen displays the date and time Press and hold the DATE key to verify the date and time Press the Esc or Enter key to return...

Page 75: ...time To display the time setting screen press and hold the DATE key in date and time state Press key to switch the digits items press the key to change the values Press the Enter key to confirm and sw...

Page 76: ...urement data This type of initialization is possible even if the power is on Reset to reset the current measurement conditions Resets data and settings other than the panel data saved measurement data...

Page 77: ...stance easily During measurement it is monitored whether normal constant current flow is present in the measurement target C In addition to resistance temperature is measured with a thermistor tempera...

Page 78: ...al method is essential for measuring very small resistance values With two terminal measurements Fig 1 the resistance of the test leads is included in the measured resistance resulting in measurement...

Page 79: ...t impedance of the voltmeter allows only negligible current flow through r3 and r4 So the voltage drop across r3 and r4 is practically nil and voltage E across the measurement terminals and voltage E0...

Page 80: ...of an DC power supply and DC voltmeter While its simple circuitry makes it easier to increase accuracy it is prone to measurement errors due to electromotive force that may be present in the measurem...

Page 81: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 81...

Page 82: ...arget having resistance temperature coefficient at t0 C of t 0 at t C and t 0 C Example If a copper test object with a resistance temperature coefficient at 20 C of 3930 ppm measures 100 at 30 C its r...

Page 83: ...ficient at 20 C is a20 and the temperature coefficient for conductivity C at t C is aCt aCt is determined as follows near the ambient temperature For example the temperature coefficient of internation...

Page 84: ...Changzhou Chuangkai Electronic Co Ltd Edition V1 0 84...

Page 85: ...t1 of 20 C and measured resistance R2 of 210 m at current ambient temperature t2 of 25 C the temperature increase value is calculated as follows Therefore the current temperature tR of the resistive...

Page 86: ...1 The amplitude of thermal EMF depends on the temperature of the measurement environment with the force generally being greater at higher temperature Increasing thermal EMF examples The measurement t...

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