background image

 

 

※ 

在电路外测试一个二极管: 

 

将旋转开关转至

  档位。 

 

分别把黑色表笔和红色表笔连接到 COM 插座和 V/

输入插座。 

 

分别把黑色表笔和红色表笔连接到被测二极管的负极和正极。 

 

仪表将显示被测二极管的正向偏压值。如果测试表笔极性接反,仪表将显示“OL”。 

 

在电路里,正常的二极管仍应产生 0.5V 到 0.8V 的正向压降;但反向偏压的读数将取决
于两表笔之间其它通道的电阻值变化。 

※ 

通断测试: 

 

把测试笔另两端测量被测电路的电阻两端,如被测电路电阻小于约 50

时,蜂鸣器会发出

连续响声,指示灯同时亮。 

 

晶体管测量 

 

不可在公共端和 hFE 端施加超过 36V 直流或交流有效值的电压以防遭到电击和/
或损坏仪表。 

 

将旋转开关转至  hFE  档位。 

 

判别晶体管是 NPN 或 PNP 型,然后将三极管的 e.b.c 三个脚插入 HFE 测试座的相应孔
内  。 

 

液晶显示器上读得被测晶体管的 hFE 近似值。 

 

电流测量   

本仪表的直流电流量程为 2mA、20.00mA、200.0mA 和 10.00A 

 当开路电压对地之间的电压超过 250V 时,切勿尝试在电路上进行电流测量。如果测

量时保险管被烧断,您可能会损坏仪表或伤害到您自己。 
为避免仪表或被测设备的损坏,  进行电流测量以前,请先检查仪表的保险管。测量时,
应使用正确的输入插座、功能档和量程。当测试笔被插在电流输入插座上的时候,切
勿把测试笔另一端并联跨接到任何电路上 

※ 

测量电流: 

 

将旋转开关转至合适档位。 

 

把黑色测试笔连接到 COM 输入插座。如被测电流小于 200mA 时将红色测试笔连接到
mA 输入插座;如被测电流在 200mA~10A 间,将红色测试笔连接到 10A 输入插座。 

 

断开待测的电路。把黑色测试笔连接到被断开的电路(其电压比较低)的一端,把红色测
试笔连接到被断开的电路(其电压比较高)的一端。 

 

接上电路的电源,然后读出显示的读数。如果显示器只显示“OL”,这表示输入超过所选
量程,旋转开关应置于更高量程。 

※ 

测量温度: 

 

将旋转开关旋至合适档位。仪表将显示周围环境温度。 

 

分别把热电偶的正负极性连接到 COM 插座和 V/

输入插座,测温探头接触待测物体表面。 

 

由液晶显示器读取测量温度值。 

 

NCV 测试(非接触电压侦测) 

 

将旋转开关旋转 NCV 档位,将仪表顶部贴近导体,如果仪表探测到 30V 以上交流电压时,
仪表根据探测到的信号强度,点亮相应信号强度指示灯(高、低),同时蜂鸣器发出不同
频率的报警声。   

※ 

注意: 

 

即使没有指示,电压仍然可能存在。不要依靠非接触电压探测器来判断导线是否存在电压。

Summary of Contents for MT-1220

Page 1: ...MT 1220 MT 1225 3 1 2 Digital Multimeter User s Manual 1 st Edition 2020 2020 Copyright by Prokit s Industries Co Ltd...

Page 2: ...this meter ensure that the test lead is flawless 1 1 2 Safety Considerations When the meter is used in the vicinity of the equipment that produces strong electromagnetic interferences the reading on t...

Page 3: ...the circuit to be measured the operator must first power off the aforesaid circuit Before repairing TV sets or measuring power switching circuit the operator must be careful enough to prevent high amp...

Page 4: ...itance may promise the dangerous voltages even if the power supply to the meter is cut off The operator should stop using and maintain the meter immediately if any abnormality has been observed on the...

Page 5: ...2 Symbols Description Symbol Description Low battery To avoid electric shock or personal injury as a result of incorrect reading promptly replace the battery when the low battery symbol appears Auto p...

Page 6: ...scription COM All public input terminals to be measured are connected to test leads in black or the public output plugs of exclusive multi function test sockets V mA Positive input terminals connected...

Page 7: ...asured In parallel connection with the circuit to be measured Read the measured voltage value on LCD screen When DC voltage measurement is attempted the display unit will show the voltage polarity of...

Page 8: ...t the test leads in black and in red to COM input socket and V input socket respectively Connect the test leads in black and in red to the positive and negative poles of the diode to be tested respect...

Page 9: ...d current is less than 200mA connect the test lead in red to a 10A input socket when the measured current is 200mA 10A Disconnection of the circuit to be measured Connect the test lead in black to the...

Page 10: ...temperature is less than 10 and relative humidity is below 80 Storage temperature humidity 10 60O C Batteries shall be removed when RH is below 70 Coefficient of temperature 0 1 accuracy O C 18 O C or...

Page 11: ...4 2 2 AC Voltage Measuring range Resolution Accuracy 200V 100mV 1 readings 10 digits 600V 1V 1 2 readings 10 digits Input impedance 1M Maximal input voltage 600V DC or AC valid value Frequency respon...

Page 12: ...letion of previous measurement 4 2 7 Temperature only MT 1225 Measuring range Resolution Accuracy 20 1000 1 1 0 Reading 3 digits Overload protection 250V DC AC 5 Meter Maintenance This section provide...

Page 13: ...ver to replace batteries unless you have already powered off the device and carried out an examination to ensure that the test lead has been disconnected from the circuit to be measured Battery Replac...

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Page 23: ...MT 1220 MT 1225 3 1 2 1 MT 12 2000 AD 1 1 A B 60Vdc 30Vac 3 1 5V AAA 600V...

Page 24: ...AC DC CAT 600 V European Union 1 2 600V 250V mA F200mA 250V A F10A 250V 2 2 1 LED...

Page 25: ...HFE 2 2 NCV hFE V mV V mV 1x10 3 0 001 A mA A mA 1x x10 3 0 001 k M k 1000 M 1 000 000 2 3 HOLD 15 3 30 2 4 COM V mA mA 10A 10A...

Page 26: ...2 5 K 3 3 1 HOLD H H 15 3 2 200 0mV 2 000V 20 00V 200 0V 600V 200 0V 600V 600V 600V V V COM V 200 0 2 000k 200 0k 2 000M 20 00M COM V 20M OL...

Page 27: ...COM V OL 0 5V 0 8V 50 hFE 36V hFE NPN PNP e b c HFE hFE 2mA 20 00mA 200 0mA 10 00A 250V COM 200mA mA 200mA 10A 10A OL COM V NCV NCV 30V...

Page 28: ...RH 0 1 18 28 600V mA F200mA 250V A F 10A 250V 3 2000 counts OL 3 x 1 5V AAA 148mm L 79mm W 48mm H 210g 4 2 18 28 80 200mV 0 1mV 0 5 5 2V 1mV 20V 10mV 200V 100mV 600V 1V 0 8 5 1M 600V DC AC 200V 100mV...

Page 29: ...1 3 2k 1 200k 100 2M 1k 20M 10k 1 5 3 250V DC AC 2 4 V 0 8mA 2 4V 30 250V DC AC hFE hFE 0 1000 10 A Vce 2 8V 2mA MT 1220 0 01 A 1 5 20mA 0 01mA 200mA 0 1mA 10 00A 10mA 3 10 mA F200mA 250V 10A F10A 250...

Page 30: ...MT 1225 20 1000 1 1 0 Reading 3 digits 250V DC AC 5 5 1 5 2 F200mA 250V F10A 250V 3 x 1 5V AAA...

Page 31: ...12 0755 83692415 83692986 83246594 83247554 400 169 9629 0755 83692143 130 7 5 886 2 22183233 E mail pk mail prokits com tw 1365 25 403 5 0755 83692415 0755 83692143 400 1699 629 E mail shenzhen mail...

Page 32: ...2020 Prokit s Industries Co Ltd All rights reserved 2020001...

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