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Summary of Contents for Maxwell MX-25 302
- Page 2 MX-25 302 User’s guide for 3 1/2 digits multimeter Description: 1.1 General description 2 Display: ½ digits liquid crystal display, with 26 mm characters max. displayable …1999 Polarity: Automatic negative polarity display Null: Automatic Measuring method: A/D converter Measurement rate: 3/seconds Overload Display: only the “1/-1”...
- Page 3 2.1 Electronic characteristics Punctuality +/- (displayed value’s rate(%) + the number of the digits) 23 +/-5 C°, if the humidity is lower than 75%. DC Voltage Measuring range Accuracy Resolution 200 mV 0,1 mV 1 mV +/- (0,5%+3) 20 V 10 mV 200 V 100 mV...
- Page 4 Resistance Measuring range Accuracy Resolution 200Ω +/- (0,8%+5) 0,1 Ω 2Ω 1 Ω 20 Ω +/- (0,8% + 3) 10 Ω 200 Ω 100 Ω 2 M Ω 1 k Ω 200 M Ω +/-(5,0%(rdg-10) + 20) 100 k Ω output voltage : <3V Overload protection: 250 V DC/AC RMS DC Current...
- Page 5 AC current Measuring range Accuracy Resolution 20 mA +/- (1,0% +5) 10 uA 200 mA +/- (2,0% +5) 100 uA 20 A +/- (3,0% +10) 10 mA Max. max measuring voltage:200 mV Max input current: 20 A (max: 10 seconds) Overload protection: 0,2 A/250 V “F”fusion 20 A measuring range not ensured! Frequency range :40-200 Hz...
- Page 6 Temperature Measuring range Accuracy Resolution -40 C° – 1000 C° +/- (1,0%+3) < 400 C° 1 C° +/- (1,5%+15) > 400 C° With K type temperature sensor Diode Test Function Description Test mode Open circuit voltage measurement Open circuit DC current approx. : 1mA Close circuit DC voltage 3V A Sound indicates, if resistance between the Output voltage 3 V...
- Page 7 Transistor h ” test Function Description Test mode … the transistors electric power (0-1000) Basis current around 10 uA (All the types) around 3V 2. Use of the device 1. Check the 9 V battery, turn Power On position. If the battery exhausted, the symbol appears on the display.
- Page 8 2.2 Measure of DC and AC current 1. connect the black wire in to the “COM”, the red in to the “mA” (max . 200mA) or the “20A” wire for measuring 200mA – 20A. 2. Switch the Function button in to the right measure range. 3.
- Page 9 2.4 Capacity measure 1. Set the function switch to the F position. 2. Connect the black test lead to the (-) jack „COM” and red lead to the (+) jack „mA”. 3. Connect test leads across the capacitor under measurement and be sure that the polarity of connection is observed. Note: 1.
- Page 10 Note: 1. This unit uses a special temperature measuring sensor. 2.7 Transistor h Test Turn the switch to h 1. Connect the sensor to the COM and mA ports. 2. Put the transistor into the appropriate socket, depending on the transistor being NPN or PNP. 3.
- Page 11 4. Warning 1. When measuring 32 V DC / 25 V AC be sure that no cables are connected to the current measuring socket and the main switch is not in diode or resistor testing mode.Always make sure that you connected the cable to the right socket for its voltage. 2.
- Page 12 4.2 Servicing the device 1. Changing the battery (one 9V battery is required) a. Switch off the unit and disconnect every external circuit. Disconnect the instrument cable from the socket. b. Remove the screws then the cover on the bottom side. c.