Instrum Multimeter - Mastech M9803R Guide
Contents
1. Digital Multimeter Guide Mastech M9803R Version 2008 Jan 1 Dept of Electrical amp Computer Engineering Portland State University Copyright 2008 Portland State University Digital Multimeter Guide ECE Dept Portland State University 1 Basic Information This guide provides basic instructions for operating the Mastech M9803R Bench Digital Multimeter The M9803R provides these features e Multiple measurement functions DC amp AC voltage DC amp AC current resistance audible continuity test capacitance frequency diode test e True RMS capability e 4 digit backlit LCD display with 42 segment bar graph e Auto and Manual Range with data hold e RS232C computer interface 2 Instrument Front Panel LCD Function Function Range Display Buttons Selector Rotary Switch OR on gt sin RS Wy REL E MAX MIN M N DC za AG Input ae mA COM V Q F Hz Terminals Figure 1 Mastech M9803R front panel Copyright Precision Mastech Enterprises Co Digital Multimeter Guide ECE Dept Portland State University LCD Panel The LCD shows the measured value as numbers in the center of the display In addition a multi segment bar graph gives an analog representation of the value At the bottom of the panel is a row of annunciators that indicate the range mode measurement unit V A Q F Hz and multiplier n u m k M Power Switch This switch controls the AC line input to the2. AC Voltage Resistance Continuity Capacitance Frequency Diode Measuring DC AC Current mA mA COM VQ Hz A mA COM VallHz O O O d Re Figure 4 Standard test lead connections for various measurements Digital Multimeter Guide 4 Measurement Procedures ECE Dept Portland State University Measuring DC Voltage V 1 Attach test leads to the input terminals Black gt COM Red gt VQ Hz 2 Turn the rotary switch to V Choose either Auto Range default or Manual Range 4 Connect the test leads in parallel across the test circuit Red probe tip positive side of circuit Black probe tip negative side of circuit 5 Read the measured voltage Note If the positions of the probe tips are swapped the measured value will have a negative sign Measuring AC Voltage V 1 Attach test leads to the input terminals Black COM Red gt VQ Hz Turn the rotary switch to V Choose either Auto Range default or Manual Range Connect the test leads in parallel across the test circuit Gr eRe E Read the measured voltage Note The M9803R displays the RMS Root Mean Square magnitude of the AC waveform Measuring DC amp AC Current up to 10 A 1 Attach test leads to the input terminals Black COM Red gt A 2 Turn the rotary switch to A Use the FUNCTION SELECTOR button to set whether DC or AC current will be measured 4 Turn off power to the test circuit and
3. Resistance Range Resolution Accuracy rdg digits 400 Q 0 12 0 5 rdg 5d 4kQ 1Q 0 5 rdg 3d 40 kQ 10Q 0 5 rdg 3d 400 kQ 100 Q 0 5 rdg 3d 4MQ 1 kQ 1 rdg 5d 40 MQ 10 kQ 1 5 rdg 10d Capacitance Range Resolution Accuracy rdg digits 4 nF 1 pF 2 rdg 40d in relative mode 40 nF 10 pF 2 rdg 5d in relative mode 400 nF 100 pF 2 rdg 5d in relative mode 4 uF 1 nF 2 rdg 5d 2 rdg 5d lt 20 uF TO oos 5 rdg 5d gt 20 uF Appendix 2 References 1 M9803R Bench Multimeter Users Manual Precision Mastech Enterprises Co
4. cross the capacitor If the capacitor is polarized be sure to follow the polarity markings 6 Read the measured capacitance Note Measurement accuracy can be improved by using REL mode Refer to full Users Manual ECE Dept Portland State University Resistance Q Capacitance F The capacitor can be safely discharged by shorting a large resistor e g 100 KQ across the two capacitor leads 6 Digital Multimeter Guide ECE Dept Portland State University Appendix I Resolution and Accuracy DC Volts mV DC Range Resolution Accuracy rdg digits 400 mV 0 1 mV 0 3 rdg 5d 4V mV 0 3 rdg 2d 40 V 10 mV 0 3 rdg 2d 400 V 100 mV 0 3 rdg 2d AC Volts true rms ac coupled Range Resolution Accuracy rdg digits 4V 1mV 40 V 10 mV 0 8 rdg 5d 50Hz to 60Hz 400 V 100 mV 1 2 rdg 2d 45Hz to 1kHz DC Current Range Resolution Accuracy rdg digits 4mA 1 uA 0 8 rdg 5d 40 mA 10 pA 0 8 rdg 5d 400 mA 100 uA 0 8 rdg 5d 10A 10 mA 1 5 rdg 10d AC Current Range Resolution Accuracy rdg digits 4 mA 1 uA 1 5 rdg 5d 45Hz to 400Hz 40 mA 10 pA 1 5 rdg 5d 45Hz to 400Hz 400 mA 100 uA 1 5 rdg 5d 45Hz to 400Hz 10A 10 mA 2 rdg 10d 45Hz to 400Hz
5. de e When the rotary switch is set for DC and AC current A pressing this button toggles between DC mode and AC mode e When the rotary switch is set for DC and AC current mA pressing this button toggles between DC mode and AC mode RANGE allows manual selection of the measurement range Differences among Auto Range Manual Range and Fixed Range modes In Auto Range mode the multimeter automatically chooses the appropriate range for measuring and displaying the data In Manual Range mode the user can step through different ranges by pushing the RANGE button In Fixed Range mode the range is set by the position of the rotary switch so the RANGE button has no effect Function Auto Manual Fixed DC Voltage y AC Voltage V y DC amp AC Current A DC amp AC Current mA Resistance y y Continuity y Capacitance V y Frequency y Diode y koai Table 1 Available range modes for each measurement function Pressing the RANGE button selects the Manual Range mode The AUTO annunciator will turn off and the MANU annunciator will turn on Each subsequent press of the RANGE button will change the range and update the display Pressing the RANGE button for longer than one second will exit the Manual Range mode and revert back to Auto Range mode The MANU annunciator will turn off and the AUTO annunciator will turn back on Warning When measuring cur
6. multimeter It is located at the rear of the multimeter case Function Range Selector Rotary Switch The rotary switch selects which measurement function to perform For DC and AC current measurements it also sets the range The multimeter is turned off by rotating the switch to the OFF position When the switch is in any other position the multimeter is turned on DC amp AC current Multimeter OFF up to 10 A i AC voltage NS 3 As a DC voltage COOMA off We Ven Selection indicator A Qog a Resistance amp DC amp AC current 40mA ce Continuity up to 400 mA Diode test Capacitance Frequency Multimeter OFF Figure 2 Close up view of the rotary switch Copyright Precision Mastech Enterprises Co Use a range that is just large enough to accommodate the maximum DC or AC current to be measured As an example if the actual current is 15 mA then the 40 mA range is optimal The 4 mA range is too small while the 400 mA range is too big Note that 400 mA will work but the 40 mA range has better resolution 2 Digital Multimeter Guide ECE Dept Portland State University Function Buttons These buttons activate additional multimeter functions Some often used buttons are BACKLIGHT illuminates the LCD display e C FUNCTION SELECTOR e When the rotary switch is set for Resistance amp Continuity pressing this button toggles between Resistance mode and Continuity mo
7. rent always start at the highest range first and check the measured value If more resolution is needed then gradually step down to lower ranges Failure to follow this procedure can lead to excessive current at the mA or A input terminals of the multimeter and may blow the internal fuse Digital Multimeter Guide ECE Dept Portland State University Input Terminals External test leads are connected to the input terminals of the multimeter Figure 3 Close up view of the input terminals Copyright Precision Mastech Enterprises Co o VQ Hz Positive input terminal for all functions except current measurements o COM Negative ground input terminal for all functions o A Positive input terminal for both DC and AC current measurements up to 10 A o MA Positive input terminal for both DC and AC current measurements up to 400 mA 3 Test Leads Test leads are insulated wires that connect the circuit or component being tested to the multimeter s input terminals Two leads are required for all measurements By convention one lead is color coded red positive input while the other is color coded black negative or ground input One end of the test lead is plugged into an input terminal on the multimeter The other end can be one of a variety of test connectors Popular choices include straight test probes alligator clips mini grabbers and spade lugs Measuring DC AC Current A A mA COM VQl IHz 00O Measuring DC
8. then connect the test leads in series with the circuit branch to be measured 5 Turn on power to the circuit and read the measured current Digital Multimeter Guide Measuring DC amp AC Current up to 400 mA 1 Attach test leads to the input terminals Black COM Red mA 2 Initially turn the rotary switch to 400mA Use the FUNCTION SELECTOR button to set whether DC or AC current will be measured 4 Turn off power to the test circuit and connect the test leads in series with the circuit branch to be measured 5 Turn on power to the circuit and read the measured current Note If the value does not have enough resolution then use the rotary switch to progressively lower the range setting to either 40mA or 4mA Measuring Resistance Q 1 Attach test leads to the input terminals Black gt COM Red gt VQ Hz 2 Turn the rotary switch to Q 3 Choose either Auto Range default or Manual Range 4 Turn off any power to the test device Connect the test leads across the resistor 5 Read the measured resistance Note Measurement accuracy can be improved by using REL mode Refer to full Users Manual Measuring Capacitance F 1 Attach test leads to the input terminals Black COM Red gt VQ Hz 2 Turn the rotary switch to 4 Choose either Auto Range default or Manual Range 4 Turn off any power to the test device and discharge the capacitor 5 Connect the test leads a
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