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MS8250A/B 

 

Digital Multimeter 

 

Operation Manual 

 

 

 

 

 

 

 

 

 

 

MS8250A/B Digital Multimeter 

 

Safety information

 

 

 

1. Safety information 

    Warning 

Please  particularly  note  that  inappropriate  use  may  cause  shock  or 

damage  to  the  meter.  When  using,  comply  with  common  safety 

procedures  and  completely  follow  the  safety  measures  stated  in  the 

operation manual.   

In  order  to  make  full  use  of  the  meter’s  functions  and  ensure  safety 
operation,  please  carefully  read  and  follow  the  use  methods  in  the 

operation manual.   

The  meter  meets  GB/T  13978-92  digital  multimeter  general  technology 

conditions,  GB4793.1-1995  (IEC  61010-1,  IEC  61010-2-032)  electronic 

measurement  instrument  safety  requirements  with  secondary  pollution  and 

over-voltage standard of CAT 

 600V. 

Please follow the safety operation guidelines to ensure the safe use of meter.   

The  meter  will  provide  satisfactory  service  to  you  if  you  use  and  protect  it 

appropriately.

 

1.1 Preparation 

1.1.1  When  using  the  meter,  the  user  should  comply  with  standard  safety 

rules:   

- General shock protection 

- Prevent misusing the meter 

1.1.2  Please  check  for  damage  that  may  have  occurred  during  transportation 

after receiving the meter. 

1.1.3 If it should be stored and shipped under hard conditions, please confirm 

if    the meter is damaged. 

1.1.4 Probe should be in good condition. Before use, please check whether the 

probe  insulation  is  damaged  and  whether  metal  wire  is  bare  (not 

properly insulated). 

1.1.5  Use  the  probe  table  provided  with  the  meter  to  ensure  safety.  If 

necessary, it should be replaced with another identical probe or one with 

the same capacity.- 1 - 

Summary of Contents for MS8250A

Page 1: ...ion and over voltage standard of CAT Ⅳ 600V Please follow the safety operation guidelines to ensure the safe use of meter The meter will provide satisfactory service to you if you use and protect it appropriately 1 1 Preparation 1 1 1 When using the meter the user should comply with standard safety rules General shock protection Prevent misusing the meter 1 1 2 Please check for damage that may hav...

Page 2: ...mmediately 1 2 13 Do not use the meter unless the bottom case and the battery cover are completely fastened in their original places 1 2 14 Don t store or use the meter in direct sunlight or high temperature and high humidity conditions 1 3 Mark Note Important safety information Refer to the operation manual Can be used for dangerous electric conductor Double insulation protection class II CAT Ⅳ A...

Page 3: ...DC current voltage DC voltage frequency duty ratio resistance capacitance measurement and circuit connection diode test The meter has automatic measuring range and manual measuring range The meter s AC current and AC voltage are measured with True RMS The meter has reading hold function relative measuring function max measuring function min measuring function auto power off function When measuring...

Page 4: ...ed for shutting off the power Jack voltage resistance frequency duty ratio capacitance diode circuit connection input wire connecting terminal Jack common wire connecting terminal Jack μA and mA current input terminal Jack 20A current input terminal 2 3 LCD display 6 MS8250A B Digital Multimeter Description AC DC Diode Audible continuity AUTO Automatic measuring range mode MAX Maximum measurement ...

Page 5: ...easurement When measuring current digital display is about 1 sec cycle analog display 0 1 sec cycle 3 1 10 Unit display has function and power unit display 3 1 11 Auto off time 30 sec 3 1 12 Operating power supply 9V 6F22 battery 3 1 13 Battery low voltage indication LCD displays symbol 3 1 14 Temperature coefficient less than 0 1 accuracy C 3 1 15 Operating temperature 0 C 40 C 3 1 16 Storage tem...

Page 6: ...tection 250V DC or AC RMS 10 MS8250A B Digital Multimeter Specification 3 2 5 Capacitance Measuring range Resolution Accuracy 40nF 0 01nF 3 0 reading 5 digits 400nF 0 1nF 4 F 0 01 F 40 F 0 01 F 100 F 0 1 F Overload protection 250V DC or AC RMS 3 2 6 Diode test Measuring range Resolution Function 0 001V Display approximate diode forward voltage value Forward DC current is about 1mA Backward DC volt...

Page 7: ...00 A 1 A 40mA 10 A 400mA 100 A 20A 10mA 1 2 reading 2 digits Overload protection A and mA grade Fuse F400mA 250V A grade Fuse F20A 250V When measuring current is greater than 5A the continuous measurement time should not be more than 10 seconds After measuring disconnect the current 3 2 10 AC current Measuring range Resolution Accuracy 400 A 0 1 A 1 5 reading 2 digits 4000 A 1 A 40mA 10 A 400mA 10...

Page 8: ...meter will enter frequency measurement state 14 MS8250A B Digital Multimeter Operating guidance 4 5 Function switch 4 5 1 When measuring voltage and current press FUNC key to switch AC voltage and AC current 4 5 2 When measuring voltage and current press FUNC to switch different measuring signals 4 6 Backlight 4 6 1 Press key to open the backlight the backlight will automatically trun off after 20...

Page 9: ...ge measurement 16 MS8250A B Digital Multimeter Operating guidance 4 11 Measurement Resistance range of this meter 400 0 4 000k 40 00k 400k 4 000M 10 00M To measure resistance 4 11 1 Rotate rotary switch to position 4 11 2 Respectively connect black and red test probes to COM input socket and V input socket 4 11 3 Measure the resistance value of circuit to be tested with other two ends of test prob...

Page 10: ...to be tested is lower than 600mA connect the red test probe to the mA input socket if the measured current is between the range of 600mA 10A the red test probe should be connected to 20A input socket 18 MS8250A B Digital Multimeter Operating guidance 4 16 4 Cut off the circuit to be tested Connect the black test probe to one end of disconnected circuit low voltage relatively and connect the red te...

Page 11: ...it should be replaced immediately 6 Accessories 1 Probe 1 pc 2 Operation Manual 1 pc 3 Battery 9V 6F22 1 pc 4 Interface cable USB interface cable MS8250B 1 pc 5 CD Communication software CD MS8250B 1 pc 20 Dongguan Huayi Mastech Co Ltd Shenzhen Huayi Mastech Co Ltd Address Floor 9 Block 3 West Saige Science Technology Park North Huaqiang Road Shenzhen City Tel 0755 83766634 0755 83766670 Fax 0755 ...

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