Mastech MS8268 HANDHELD DIGITAL MULTIMETER OPERATOR’S INSTRUCTION MANUAL http://www.HisTest.
Table of Contents Table of Contents TITLE PAGE 1. GENERAL INSTRUCTIONS 1.1 Precaution safety measures 1.1.1 Preliminary 1.1.2 During use 1.1.3 Symbols 1.1.4 Instructions 1.2 Safety mechanisms 1 1 1 2 4 4 5 2. DESCRIPTION 6 2.1 Instrument Familiarization 2.2 LCD Display 2.3 Keypad 2.4 Terminals 6 7 9 10 2.5 Rotary switch 2.6 Accessories 11 11 3. FUNCTION DESCRIPTION 12 3.1 General Functions 3.1.1 Misconnection alarm system 3.1.2 DATA HOLD mode 3.1.3 Manual ranging and Autorange mode 3.1.
1. GENERAL INSTRUCTIONS This instrument complies with IEC 1010-1 (61010-1@IEC: 2001), CAT. II 1000V and CAT. III 600V overvoltage standards. See Specifications. To get the best service from this instrument, read carefully this user's manual and respect the detailed safety precautions. International symbols used on the Meter and in this manual are explained in chapter 1.1.3 1.1 Precautions safety measures 1.1.1 Preliminary * Measurement category III is for measurements performed in the building installation.
* Do not apply any voltage measurement between the 10A * Replace the batteries as soon as the battery indicator ( terminal and the COM terminal. * Caution when working with voltages above 60Vdc or 30Vac rms. Such voltages pose a shock hazard. * When using the probes, keep your fingers behind the finger guards. * When making connections, connect the common test lead before connecting the live test lead; when disconnecting, disconnect the live test lead before disconnecting the common test lead.
* Any adjustment, maintenance or repair work carried out on the meter while it is live should be carried out only by 2. DESCRIPTION 2.1 Instrument Familiarization appropriately qualified personnel, after having taken into account the instructions in this present manual. * A "qualified person" is someone who is familiar with the installation, construction and operation of the equipment and the hazards involved.
2.2 LCD Display See Table 1 indicated for information about the LCD display. Symbol Table 1. Display Symbols (continued continued)) Meaning ∆ REL REL∆ Indicator for the Relative measurement. Indicator for the Diode Test mode hFE Indicator for the transistor test mode Indicator for the Continuity Check mode. Indicator for the Data Hold mode AC V, mV Meaning The battery is low.
2.3 Keypad See Table 2 indicated for information about the keypad operations. Table 2. Keypad Key RANGE Function V~ V~,,V , Ω , mA and µA SELECT V~ V~,, A, and µA. HOLD Any switch Press HOLD to enter and exit position 1. Press RANGE to enter the manual ranging mode. 2. Press RANGE to step through the ranges available for the selected function. 3. Press and hold RANGE for 2 seconds to return to autoranging. LIGHT mA Press to turn the backlight on.
2.5 Rotary switch A eleven-position rotary selector switch gives access to the following quantities: ℕ Current: 10A ℕ Current: mA ℕ Current: µA ℕ DC Voltage ℕ AC Voltage ℕ OFF: off position ℕ Resistance ℕ Diode and Continuity (with beep) ℕ Capacitance ℕ Transistor: hFE ℕ Frequency 3. FUNCTION DESCRIPTION 3.1 General Functions 3.1.1 Misconnection alarm system The input terminals of the meter are equipped with sound and light alarms against misconnection of test leads.
2 DATA HOLD mode 3.1. 3.1.2 Data Hold mode makes the meter stop updating the display. Enabling Data Hold function in autorange mode makes the meter switch to Manual ranging mode, but the full-scale range remains the same. Data Hold function can be cancelled by changing the measurement mode, pressing RANGE key, or push HOLD key again. To enter and exit the Data Hold mode: 1. Press HOLD key (short press). Fixes the display on H” is displayed. the current value, “H 2.
3.2 Measurement Functions 3.2.1 AC and DC Voltage measurement To avoid electrical shock and/or damage to the instrument, do not attempt to take any voltage measurement that might exceed 1000Vdc or 750Vac rms. To avoid electrical shock and/or damage to the instrument, do not apply more than 1000Vdc or 750Vac rms between the common terminal and the earth ground. The polarity of ac (alternating current) voltage varies over time; the polarity of dc (direct current) voltage is constant.
ℕ The resistance function can produce enough voltage to forward-bias silicon diode or transistor junctions, causing them to conduct. To avoid this, do not use the 40MΩ range for in-circuit resistance measurements. ℕ On 40M Ω range, the meter may take a few seconds to stabilize reading. This is normal for high resistance 5. The meter will show the approx. forward voltage of the diode. In a circuit, a good diode should still produce a forward bias reading of 0.5V to 0.
To test the hFE of transistor: To measure capacitance: 1. Set the rotary switch to hFE range. 1. Set the rotary switch to 2. Connect the “com” plug and “+” plug of the special 2. Connect the black and red test leads to the COM and multi-function socket to the COM and hFE terminals. 3. Determine whether the transistor to be tested is NPN or PNP type and locate the Emitter, Base and Collector leads. terminals respectively. range.
Note: Distortion can cause multiple triggering of the frequency ℕ Reading is possible at input voltages above 3V rms, but the counter. Selecting a higher voltage range might solve this accuracy is not guaranteed. problem by decreasing the sensitivity of the meter. Also, try ℕ In noisy environment, it is preferable to use shield cable for measuring small signal. selecting a dc range, which raises the trigger level. In general, the lowest frequency displayed is the correct one.
5. Break the circuit path to be tested. 10A: F 10A/250V ∅6.3×32 mm. Touch the black probe to the more negative side of the ℕ Sample Rate: 3 times/sec for digital data. break; touch the red probe to the more positive side of ℕ Display: the break. (Reversing the leads will give a negative reading, but will not damage the Meter.) 6. Turn on power to the circuit; then read the display. Be 3 3/4 digits LCD display. Automatic indication of functions and symbols. ℕ Range selection: automatic and manual.
4.2.2 AC Voltage Range Resolution Accuracy 400mV 0.1mV ±(3.0% of rdg + 3 digits) 4V 1mV 40V 10mV 400V 100mV 750V 1V ±（0.8% of rdg +3 digits） ±（1.0% of rdg +3 digits） Input impedance: 10MΩ 5 Diode 4.2. 4.2.5 Range Resolution 1mV Forward DC Current: approx. 1mA Reversed DC Voltage: approx. 1.5V Overload protection: 250Vdc or 150Vac rms. 6 Transistor .2.6 4.2. Range Max. input voltage: 1000Vdc or 750V ac rms. Frequency Range: 40Hz-200Hz for 4V range, 40Hz-1kHz for other ranges.
- By Hz range range:: Overload protection: 250V dc or 250V ac rms. Input Voltage range: 0.6V-3V ac rms (Input voltage must be enlarged with increasing frequency under measurement) Frequency Response: 10Hz-200kHz, sine wave. 0.5Hz-200kHz, square wave. e range - By AC Voltag Voltage range： Input Voltage range: 1V-750Vac rms (Input voltage must be enlarged with increasing frequency under measurement) Frequency Response: 1Hz-10kHz, sine wave. Maximum input voltage: 1000V dc or 750V ac rms.
5. MAINTENANCE This section provides basic maintenance information, including fuse and battery replacement instructions. Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance test, and service information. 5.1 General Maintenance To avoid electrical shock or damage to the meter, do not get water inside the case.
+ + AA A AA A + - Figure 2. Battery and Fuse Replacemen Replacementt CAUTION: “Using this appliance in an environment with a strong radiated radio-frequency electromagnetic field9approximately 3V/m), may influence its measuring accuracy.
