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MS8218 True RMS Multimeter

Operation Methods

23

Diode Measurement

Figure 3-5

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Summary of Contents for MS8218

Page 1: ...acteristics Explanation on Front Panel Understanding Display Screen Function Descriptions Chapter 3 Operation Methods ACV dBm Measurement DCV DCV ACV Measurement DC mV AC mV DC mV AC mV Measurement Logic Frequency Duty Ratio Measurement Diode Measurement Resistance continuity Measurement Capacitance Measurement DC μA AC μA DC μA AC μA Measurement I 1 1 2 3 8 11 14 16 18 20 22 24 26 28 4 ...

Page 2: ...inimum Value Maximum Value Minimum Value Measurement Backlight Control Data Hold Automatic Shutdown and Continuous Operation Mode Selection Connected to RS 232C Interface Of Computer Chapter 4 Technological Specifications General Features Range and Accuracy Chapter 5 Maintenance Replacement of Batteries Replacement of Fuse Meter Calibration Others II 30 32 34 35 35 36 36 36 37 38 39 43 43 44 44 ...

Page 3: ...Before use of the meter firstly check up if there is any crack on the outer shell or if it lacks any plastic part and check up whether the testing line is damaged or has any exposed metal The meter can be used only if no any insulating problem be found Carefully read the operating methods and safety prompts in this manual Using it not based on the methods specified in this manual may cause the met...

Page 4: ...eries it is necessary firstly to pull out the testing line AA batteries should be used and they should be put into the meter with the proper polarity Must not make any voltage measurement when the testing line being inserting into the current hole Repair and calibration of the meter must be carried out by experienced professionals unprofessionals should not repair and calibrate the meter by themse...

Page 5: ...ty ratio measurement Capacitance measurement from 0 01nf to 5000μF AC DC true RMS measurement DBm measurement Maximum value minimum value measurement Relative measurement 50 segment analog bar display Automatic shutdown continuous working mode selection Back light control RS 232C infrared interface Display record and graphics software of computer Overload protection Sound alarm for wrong current m...

Page 6: ...MS8218 True RMS Multimeter Introduction to the Meter Explanation on Front Panel The front panel is shown as in Figure 2 1 explanation being as follows 4 ...

Page 7: ...rrent resistance and Capacitance 6 POWER switch Used for putting on or off the operating power for the meter 7 RANGE key For various kinds of measurements it is used manually to select range Under the automatic range state AUTO displaying it will enter manual range state MANUAL displaying with a press on RANGE after that the range will be changed with a press on RANGE while the small digits on the...

Page 8: ...N key Press MAX MIN key to enter the record state for the maximum and minimum value and simultaneously display the maximum value By pressing this key again it will be possible to display the minimum value and the maximum value minimum value When releasing the key after pressing it for two seconds the maximum and minimum record state will be exited Pressing this key will be void during frequency di...

Page 9: ...ta to the RS 232C interface 13 LIGHT key By pressing this key for a time the backlight of the LCD screen will be opened and after five seconds the meter will automatically turn off the backlight It is also possible to turn off the backlight by pressing the LIGHT key before the five seconds 14 Hz key During the voltage or current measurements by pressing Hz key the meter will enter the linear frequ...

Page 10: ...MS8218 True RMS Multimeter Introduction to the Meter Understanding Display Screen Figure 2 2 8 ...

Page 11: ...r MHz KHz and Hz of frequency 2 Indicating the measurement unit being the duty ratio of logic impulse 3 MAX MIN Indicating the display value being the maximum value MAX the minimum value MIN or the maximum value the minimum value MAX MIN 4 AUTO Indicating the measurement being automatic range 5 MANUAL Indicating the measurement being manual range 6 51000 Indicator of range indicating the full rang...

Page 12: ... it is DC AC measurement 13 Indicating it is now in the data holding state 14 Please Wait When measuring 50μF 5000μF capacitor under automatic range for ensuring the accuracy of measurement it is necessary to perform the measurement after fully discharging capacitor while prompting the operator to wait 15 Analog bar indicating the measurement value with a graphic mode 16 Indicating the meter being...

Page 13: ... selecting the DC AC measurement mode this meter will perform measurements on both DC and AC components respectively and then calculate and display the results according to the following formula DC AC measurements reflect the general effective values generated jointly by both the DC and AC components Automatic and manual ranges When turning on the meter s power switch the meter defaults the automa...

Page 14: ...he meter remembers internally the instantaneously measured value called initial value when pressing the REL Δ key and the later displaying value being present value initial value The relative measurement value reflects the changes of the measured value It also can be used to take off the errors brought about by lead resistance or distributed capacitance during measuring low resistance and low capa...

Page 15: ...l on the LCD screen will be lighted to prompt the batteries should be replaced Analog indication bar analog indication bar is used for graphic measurement value and it always synchronizes with the size of the present measured value During the maximum value minimum value measurement and the relative value measurement it sill synchronizes with the size of the present measured value and not indicatin...

Page 16: ...cessary to remove both the red and black probes from the measured circuit immediately 6 By pressing the RANGE key it is possible to select range manually Indicator of range displays range While displaying OL during manual range measurement it is necessary to select a larger range When OL displaying under the maximum range it indicates the voltage exceeding 1000V so it is necessary to remove both t...

Page 17: ...MS8218 True RMS Multimeter Operation Methods 15 ACV dBm Measurement Figure 3 1 Warning Not try to measure a voltage higher then 1000 volt ...

Page 18: ...tes the measured voltage exceeding the range of the meter and it is necessary to remove the both red and black probes from the measured circuit immediately 6 When performing DCV measurement by pressing the RANGE key it is possible to select range manually The indicator of range indicates the range value If OL displaying during manual range measurement it is necessary to select a larger range If OL...

Page 19: ...MS8218 True RMS Multimeter Operation Methods 17 DCV DCV ACV Measurement Figure 3 2 Warning Not try to measure a voltage higher then 1000 volt ...

Page 20: ...playing on the meter it indicates the measured voltage exceeding the range of the meter and it is necessary to remove both the red and black probes from the measured circuit immediately 6 When performing DCmV or ACmV measurement by pressing the RANGE key it is possible to select range manually The indicator of range indicates the range value If OL displaying during manual range measurement it is n...

Page 21: ...MS8218 True RMS Multimeter Operation Methods 19 DC mV AC mV DC mV Ac mV Measurement Figure 3 3 ...

Page 22: ...Hz end and the black testing line into the COM end 3 Press the SELECT key to select the logic frequency Hz or duty ratio modes 4 Connect the red testing line to high logic level the black one to low logic level 5 Read the measured value from the display screen If the frequency of the measured signal is lower or higher than the meter s measurement range the reading will be displayed as zero If the ...

Page 23: ...MS8218 True RMS Multimeter Operation Methods 21 Logic Frequency Duty Ratio Measuremeat Figure 3 4 ...

Page 24: ...its negative polarity while the display screen will display the forward voltage drop 4 Connect the black probe to the positive polarity of the diode and the red probe to its negative polarity if OL displaying on the display screen it indicates the backward resistance of the diode being normal while OL not displaying it indicates that the diode is backward leaking Notes In case of performing diode ...

Page 25: ...MS8218 True RMS Multimeter Operation Methods 23 Diode Measurement Figure 3 5 ...

Page 26: ...ack probes to the two measured points respectively In case of the resistance between the two points being less than about 50Ω 60Ω the buzzer will sound while the display screen displaying the value of resistance If OL displaying it indicates the resistance between the two points is larger than 500Ω 5 When the resistance measurement mode being implemented it is possible to select range by pressing ...

Page 27: ...MS8218 True RMS Multimeter Operation Methods 25 Resistance Continuity Measurement Figure 3 6 ...

Page 28: ...y of the capacitor and the black probe to its negative polarity 5 Read the capacitance from the display screen If capacitance value 5300μF the meter will display OL while capacitance value 10PF it will display zero 6 It is possible to select range manually by pressing the RANGE key The indicator of range indicates the value of range If OL displaying during manual range measurement it is necessary ...

Page 29: ...MS8218 True RMS Multimeter Operation Methods 27 Capacitance Measurement Figure 3 7 ...

Page 30: ...s to the measured circuit in serial way and then turn on the power of the measured circuit 3 Read the measured value from the display screen If it displays as positive during the DC measurement it means the current is flowing into the meter from the red testing line while it displaying as negative it means the current is flowing into the meter from the black testing line If it displays as OL it me...

Page 31: ...MS8218 True RMS Multimeter Operation Methods 29 DC μ μ μ μA AC μ μ μ μA DC μ μ μ μA AC μ μ μ μA Measurement Figure 3 8 ...

Page 32: ...cuit in a serial way and then turn on the power of the measured circuit again 5 Read the measured value from the display screen If it displays as positive during DC measurement it means the current is flowing into the meter from the red testing line while it displays as negative it means the current is flowing into the meter from the black testing line If it displays OL indicating current exceedin...

Page 33: ...MS8218 True RMS Multimeter Operation Methods 31 DC mA AC mA DC mA AC mA Measurement Figure 3 9 ...

Page 34: ...t in a serial way and then turn on the power of the measured circuit again 5 Read the measured value from the display screen During the DC measurement if it displays as positive it means the current is flowing into the meter from the red testing line while it displays as negative it means the current is flowing into the meter from the black testing line If it displays OL it indicates current excee...

Page 35: ...MS8218 True RMS Multimeter Operation Methods 33 DC Ampere AC Ampere DC Ampere AC Ampere Measurement Figure 3 10 ...

Page 36: ...d requirements for signal amplitude when it is in different ranges for information of which please refer to Table 3 1 2 If the position of rotary switch is in ACV or DCV after pressing Hz key the indicator of range will indicates the meter s present voltage range In addition it is possible to change the range by pressing the RANGE key to meet the different voltages 3 Press Hz key again to exit lin...

Page 37: ...ead resistance will have been taken off from the displayed value When performing capacitance measurement open the red and black testing line press REL key to record the distributed capacitance and after that performing capacitance measurement again the distributed capacitance will have been taken off from the displayed value During relative measurement analog bar is always indicating the present m...

Page 38: ... the backlight can be turned off in advance Lighting the backlight will cause three times higher energy consumption than the ordinary operation So by less use of backlight power can be saved Data Hold By pressing the HOLD key it is possible to hold the measurement value and the state at the moment of pressing the HOLD key While pressing the key again data measurement will be resumed Automatic Shut...

Page 39: ...D display screen displaying Then it will be able to record analyze draw and print all the measurement on computer as long as you insert one end of the RS 232C cable options into the front socket of the meter and another end into the computer RS 232C interface and run the record and graphics software options And press the HOLD key for two seconds and then release it again the meter will stop to sen...

Page 40: ...age will be 250V effective value while in the positions of μA mA the protection current being 0 64A and in the position of A the protection current being 12 5A Over range indication OL When the total voltage of batteries being lower than 6 8V the symbol for battery display will be lighted Fuse being 0 63A 500V μA mA end and 12 5A 500V A end Six 7 AA batteries X 1 5V Infrared coupling RS 232C inter...

Page 41: ...C Voltage DC Voltage AC Voltage Accuracy Range Resolution 40Hz 1KHz 1KHz 10KHz 10KHz 20KHz 50mV 0 001mV 0 5 40 1 40 2 5 40 500mV 0 01mV 0 5 40 1 40 2 5 40 5V 0 1mV 0 5 40 1 40 2 5 40 50V 1mV 0 5 40 1 40 2 5 40 500V 10mV 0 5 40 1 40 unspecified 1000V 0 1V 0 5 40 unspecified unspecified Notes above accuracies can be guaranteed within 10 100 of the full range DC Voltage Range Resolution Accuracy 50mV...

Page 42: ...5 20 1 20 2 20 500mA 10μA 0 75 10 1 10 2 10 1 5mV mA 5A 0 1mA 0 75 20 1 5 20 5 20 10A 1mA 1 0 10 1 5 10 Unspecified 30mV A Notes above accuracies can be guaranteed within 10 100 of the full range DC Current Range Resolution Accuracy Voltage Drop 500μA 0 01μA 0 15 15 5000μA 0 1μA 0 15 10 102µV µA 50mA 1μA 0 15 10 500mA 10μA 0 15 10 1 5mV mA 5A 0 1mA 0 5 10 10A 1mA 0 5 10 30mV A Notes above accuraci...

Page 43: ...KΩ 0 5 10 Notes above accuracies can be guaranteed within the full range Capacitance Range Resolution Accuracy 50nF 0 01nF 1 5 500nF 0 1nF 1 5 5μF 1nF 1 5 50μF 10nF 1 5 500μF 0 1μF 2 5 5000μF 1μF 2 5 Notes above accuracies for film capacitor or better can be guaranteed within the full range Diode Range Resolution Accuracy 2 5V 0 1mV 1 5 Notes the test current is about 0 7mA 41 ...

Page 44: ...ve 0 006 4 Linear Frequency Frequency Range Voltage Current Range Sensitivity Accuracy 500mV 100mV 5V 0 5V 50V 4V 500V 40V 1000V 400V 5000μA 1mA 5Hz 200KHz sine wave 500mA 100mA 0 006 4 Notes Low voltage or low frequency would lower the accuracy Duty Ratio Frequency Range Duty Ratio Range Resolution Accuracy 5Hz 500KHz 5 95 0 01 2 5 42 ...

Page 45: ... rotate the two plastic bolts for 90 according to the direction of clock hand while closing the cover should do for 90 according to the opposite direction of clock hand Rotation more than 90 may damage the plastic bolts Replacement of Fuse It must take off the red and black testing lines from the measured circuit and turn off the power of the meter before replacement of fuse It should only use fus...

Page 46: ...contact us for calibration methods when there is a need on calibration meter while those who having not such conditions can contact us for calibration matters Others In case of any default being found this meter must not be used continuously When the meter needs repair please send it to experienced professionals or the appointed maintenance department for repairing It should use soft cloth but not...

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