VA55 MANUAL 091224 WLS0238
Contents
1. DC Voltage Figure3 1 Measuring AC and DC Voltage 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 3 2 2 Freguency and Duty Cycle measurement Do not measure Frequency on high voltage gt 1000V A to avoid electrical shock hazard and or damage to the instrument To measure frequency or Duty Cycle set up and connect the Meter as shown in Figure 3 2 1 Set the rotary switch to the Hz mV range 2 Press SELECT key to select Hz 3 3 Insert the black and red test leads into the COM and Hz uis input terminals 4 Connect the test leads tip in parallel with the circuit to be measured And don t touch any electrical conductors 5 Read the frequency on the main display and read the percent of duty cycle on the sub display NOTE In noisy environment it is preferable to use shield cable for measuring small signal PC LINK ii iinet A ah be MA WWE vio at AY t maa NARO Figure 3 2 Measuring Frequency and Duty Cycle 15 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 3 2 3 Resistance measurement To avoid electrical shock and or damage to the A instrument disconnect circuit power and discharge all high voltage capacitors before measuring resistance Resistance is an opposition to current flow The unit of resistance is the ohm Q The Meter measures resistance by sending a small current thro2. C 32 F 122 F lt 80 RH lt 10 C non condensing Storage temperature 10 60 C 14 F 140 F lt 70 RH battery removed Temperature Coefficient 0 1x specified accuracy C lt 18 C or gt 28 C MAX Voltage between terminals and earth ground 1000V AC rms or 1000V DC Fuse Protection mA F 0 25A 1000V 10 3x38 A F 10A 1000V 10 3x38 Sample Rate 3 times sec for digital data Display 4 1 2 digits LCD display Automatic indication of functions and symbols Range selection automatic and manual Over Range indication LCD will display OL Low battery indication 4 segment battery indicator please replace the battery as soon as the battery power is less than one grid so as not to affect the measurement accuracy Polarity indication displayed automatically Power source 9V Battery type 6F22 Dimensions 190 L x90 W x40 H mm Weight 500g Approx battery included 4 2 Measurement specifications Accuracy is specified for one year after calibration at operating temperatures of 18 C to 28 C with relative humidity at 0 to 75 Accuracy specifications take the form of of Reading Number of Least Significant Digits 23 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 4 2 1 AC Voltage ACV Range Resolution Accuracy 40Hz 400Hz 2V 0 1mV 0 5 40 20V 1mvV 0 5 40 200V 10mvV 0 5 40 1000V 0 1V 0 5 40 Above accuracies can be guaranteed within 5
3. follows 1 LCD display Used for displaying the measuring results and various symbols Keypad Measurement function keys Rotary switch Used for selecting measurement functions We Terminal receiving the red test lead for all measurement functions except for current measurement lt is the positive terminal for measurement of T1 thermocouple mA Terminal receiving the red test lead for mA measurements lt is the positive terminal for measurement of T2 thermocouple A Terminal receiving the red test lead for 10A measurements lt is the negative terminal for measurement of T2 thermocouple COM Terminal receiving the black test lead as a common reference It is the negative terminal for measurement of T1 thermocouple PC Link interface 2 2 LCD Display ONGC Tooooous ve ji ia 43 ji eo are oe ec rm nc OUD ty i J oe St ai Sania es ae SA 20 Figure 2 2 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL LCD screen is shown as in Figure 2 2 with its every symbol s meaning shown as in the Table 1 No Meaning 1 The main display for the meter s measurement value showing all the measurement values 2 Indicator for AC voltage or current 3 Indicates negative readings 4 DC Indicator for DC voltage or current 5 Unsafe voltage voltage 36V or voltage overload OL 6 AUTO The meter is in the Autor
4. 100 of the full range The true RMS meter has residual value within 10 counts when the test leads are shorten but that will not affect the accuracy of measurement 4 2 2 DC Voltage DCV Range Resolution Accuracy 200mV 0 01mV 0 05 10 2V 0 1mV 0 05 10 20V 1mV 0 05 10 200V 10mV 0 05 10 1000V 0 1V 0 05 10 24 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 4 2 3 Freguency Logic frequency 1Hz 1MHz Function Range Resolution Accuracy 99 999Hz 0 001 Hz 999 99Hz 0 01 Hz Frequency 9 9999kHz 0 1Hz 5 10Hz 2MHz 99 999kHz 1Hz 0 05 10 999 99kHz 0 01kHz 2 0000MHz 0 1KHz Sensitivity Vp 2 5V Square Wave Linear frequency 6HZ 10KHZ Function Range Resolution Accuracy 2V 0 15V 20V 2V Freguency 200V 20V A 10Hz 200KHz 1000V 100V SA Wa 200mA 20 mA 10A 1A Above accuracies can be guaranteed within 10 100 of the full range 4 2 4 Duty cycle Frequency Range Range Resolution Accuracy 10Hz 20KHz 10 90 0 01 1 30 25 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 4 2 5 Resistance Range Resolution Accuracy 200 00 0 010 2 0000k2 0 10 20 000k2 10 a 200 00kQ 100 Boveri 2 0000MQ 1000 20 000MQ 1KQ 4 2 6 Diode Test Range Resolution Accuracy 2V 0 1mV Approximate values of forward voltage 4 2
5. 2 7 Current measurement A To avoid damage to the Meter or injury if the fuse blows never attempt an in circuit current measurement where the open circuit potential to earth is greater than 1000V To avoid damage to the meter check the meter s fuse before proceeding Use the proper terminals function and range for your measurement Never place the probes in parallel with a circuit or component when the leads are plugged into the current terminals To measure current set up the Meter as shown in Fure 3 7 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Set the rotary switch to the mA or A range 3 Press SELECT key to select DCA or ACA measuring mode When measuring AC current the sub display will show the frequency of AC signal 4 In mV_range press SELECT key twice to activate percent display O 4mA 100 20mA 5 Connect the black test lead to the COM terminal and the red test leads to the mA terminal for a maximum of 600mA ET a Maximum of 10A move the red test lead to the A erminal 6 Break the circuit path to be tested Touch the black probe to the more negative side of the break touch the red probe to the more positive side of the break Reversing the leads will give a negative reading but will not damage the Meter a 7 Turn on power to the circuit then read the eplay Be sure to note the measurement units at the right side of the display uA mA or A When only the figu
6. 3 Battery replacement A To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator 2 appears Before replacing the battery disconnect test leads and or any connectors from any circuit under test turn the meter off and remove test leads from the input terminals Set rotary switch to the OFF position Disconnect test leads and or any connectors from the terminals Use a screwdriver to unlock the two screws on the battery cover Take out the battery cover from the meter Remove the used battery Replace with one new 9V battery 6F22 Rejoin the battery cover and tighten the screws NOOR OD 6 ACCESSORIES Delivered with the multimeter e User s manual One piece e Test leads One piece e K type Thermocouple Two piece e Multi function socket One piece e USB line One piece e PC Link software CD One piece If there are some changes in accessories please refer to the real product as standard 29
7. 7 Continuity Check Range Resolution 2009 0 012 Description Continuity beepers40Q 4 2 8 Capacitance Range Resolution Accuracy 20nF 0 01nF 200nF 0 1nF 5 Our Tne 1 5 20 20uF 10nF 200uF 0 14 F 1000uF TuF 2 0Yo 420 26 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 4 2 9 Temperature Range Resolution Accuracy 200 C 100 C 01 C 1 0 10 100 C 1300 C i 0 5 10 Note The specifications of temperature don t include thermocouple errors 4 2 10 Current DCA Range Resolution Accuracy 200mA 0 01mA 0 2 20 10A imA 0 2 20 ACA Range Resolution Accuracy 200mA 0 0i1mA 1 0 30 10A 1mA 1 0 30 Above accuracies can be guaranteed within 5 100 of the full range The true RMS meter has residual value within 10 counts when the test leads are shorten but that will not affect the accuracy of measurement Overload protection F 10A 1000V fuse for 10A range F 0 25A 1000V fuse for mA ranges Maximum input current 200mA dc or 200mA ac rms for mA ranges 10A dc or 10A ac rms for 10A ranges 27 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 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 relevan
8. Contents TITLE 1 GENERAL INSTRUCTIONS 1 1 Precaution safety measures 1 1 1 Preliminary 1 1 2 During use 1 2 Symbols 1 3 Instructions 2 DESCRIPTION 2 1 Instrument Familiarization 2 2 LCD Display 2 3 Key pad 3 FUNCTION DESCRIPTION 3 1 General Functions 3 1 1 DATA HOLD mode 3 1 2 Manual range and Autorange mode 3 1 3 True RMS measurement 3 1 4 Relative measurement mode 3 1 5 Analog indication bar 3 1 6 Auto power off setting 3 2 Measurement Functions 3 2 1 AC and DC Voltage measurement 3 2 2 Frequency measurement TITLE 3 2 3 Resistance measurement 3 2 4 Continuity Check 3 2 5 Diode Test 3 2 6 Capacitance measurement 3 2 7 Current measurement 3 2 8 Temperature measurement 3 2 9 PC Link 4 TECHNICAL SPECIFICATIONS 4 1 General specifications 4 2 Measurement specifications 4 2 1 AC Voltage 4 2 2 DC Voltage 4 2 3 Frequency 4 2 4 Duty cycle 4 2 5 Resistance 4 2 6 Diode Test 4 2 7 Continuity Check 4 2 8 Capacitance 4 2 9 Temperature 4 2 10 Current 5 MAINTENANCE TITLE 5 1 General maintenance 5 2 Fuse replacement 5 3 Battery replacement 6 ACCESSORIES 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 1 GENERAL INSTRUCTIONS This instrument complies with IEC 61010 1 2001 CAT TII 1000V and CAT VI 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 t
9. ange mode in which the meter automatically selects the range with the best resolution 7 MANU The meter is in the Manual Range mode in which the user selects the range 8 Indicator for auto power off 9 H The meter is in Data Hold mode 10 MAX MIN Display maximum minimum data 11 PC LINK The Meter is in the data transmission mode 12 REL The meter is in Relative Measurement mode eon 13 sub display zone 14 T2 Indicator for T2 thermocouple CF 15 mVA Measurement units of sub display KHz 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL Tabeli continue No Symbol Meaning 16 on The meter is in Continuity Check mode 17 gt The meter is in Diode Test mode 18 T1 Indicator for T1 thermocouple CF numF RIN 19 umVA Measurement units of main display MKQHz 20 NY if Analog bar indicating the measurement value with a graphic mode 21 4 segment battery indication 2 3 Keypad 2 3 1 SELECT 1 At V position Switches between dc and ac voltage 2 At DCmV Hz position Switches between dc mV and frequency 3 At gt t position Switches between Continuity check and Diode Test 4 At IC position Switches between and F 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 5 At mA position Switches between dc ac mA and percent display 6 At A position Switches between dc and ac current 7 Power up Option Disables automatic power off feature 2 3 2 RANGE 1 Press RANGE to ent
10. bution panel devices Pangi e Lighting systems in larger buildings commercial lighting Appli j f e Appliance outlets with short connections to service entrance e Refers to the origin of installation i e where low voltage connection is Three phase at made to utility power CAT VI utility connection e Electricity meters primary overcurrent protection equipment any outdoor conductors e Outside and service entrance service drop from pole to building run between meter and panel e Overhead line to detached building underground line to well pump When using this Multimeter the user must observe all normal safety rules concerning protection against the dangers of electric current protection of the Multimeter against misuse For your own safety only use the test probes supplied with the instrument Before use check that they are in good condition 2 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 1 1 2 During use If the meter is used near noise generating equipment be aware that display may become unstable or indicate large errors Do not use the meter or test leads if they look damaged Use the meter only as specified in this manual otherwise the protection provided by the meter may be impaired Use extreme caution when working around bare conductors or bus bars Do not operate the meter around explosive gas vapor or dust Verify a Meter s operation by measuring a known vol
11. ction can be cancelled by changing the measurement mode pressing any key except the backlight key To enter and exit the Data Hold mode 1 Press HOLD key short press Fixes the display on the current value H is displayed 2 Asecond short press returns the meter to normal mode 3 1 2 Manual range and Autorange mode The Meter has both manual range and autorange options In the autorange mode the Meter selects the best range for the input detected This allows you to switch test points without having to reset the range In the manual range mode you select the range This allows you to override autorange and lock the meter in a specific range The Meter defaults to the autorange mode in measurement functions that have more than one range When the Meter is in the autorange mode AUTO is displayed To enter and exit the manual range mode 1 Press RANGE key The Meter enters the manual ranging mode AUTO turns off Each presses of RANGE key increments the range When the highest range is reached the Meter wraps to the lowest range NOTE If you manually change the measurement range after entering the Data Hold modes the Meter exits this mode 11 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 2 To exit the manual range mode press and hold down RANGE key for two seconds The Meter returns to the autorange mode and AUTO is displayed 3 1 3 TRUE RMS measurement All the measurement values of this meter on the AC voltage and AC current a
12. e icon will 12 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL disappear 3 When RS232 output is active the auto power off function is disabled 13 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 3 2 Measurement Functions 3 2 1 AC and DC Voltage measurement To avoid electrical shock and or damage to the A instrument do not attempt to take any voltage measurement that might exceeds 1000Vdc or 1000Vac rms To avoid electrical shock and or damage to the instrument do not apply more than 1000Vdc or 1000Vac rms between the common terminal and the earth ground Voltage is the difference in electrical potential between two oints he polarity of ac alternating current voltage varies over time the polarity of dc direct current voltage is constant To measure ac or dc voltage set up and connect the Meter as shown in Figure 3 1 Set the rotary switch to the position of V or Hz mV 1 Press SELECT key to select between AC and DC voltage mode It has no ac mode in mV range 2 Connect the black and red test leads to the COM and V terminals das parties 3 Connect the test leads tip in parallel with the circuit to be measured 4 Read the voltage value on the main display and read the frequency of AC signal on the sub display NOTE In case of probe hanging in the air the voltage inducted by the test leads mi cause unstable readings on the display screen but that will not affect the accuracy of measurement 14
13. er 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 Except Continuity Duty Temperature 2 3 3 RELA Press RELA to enter the Relative measurement mode The sub display will show the value measured at the time when pressing the key it is called the initial value and the main display shows the relative value that will be equivalent to the present value minus the initial value By pressing the key again the relative measurement state will be exited Except Hz Duty 2 3 4 MAX MIN This key is for measuring maximum value and minimum value 1 Press it to enter Max Min mode The main display always shows the current value and the sub display shows the Maximum Value 2 Press it again the sub display will show the Minimum Value 3 Press and hold it for two seconds the meter will return to normal measurement state Except Hz Duty 2 3 5 HOLD 1 Press it to enter the Data Hold mode Used to maintain the measurement data unchanging by pressing the key again it will exit the Data Hold mode 2 Pressing this key and last for 2 seconds will enter into PC LINK mode 2 3 6 71 gt 10 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL Press the key backlight on press it again backlight off 3 FUNCTION DESCRIPTION 3 1 General Functions 3 1 1 DATA HOLD mode Data Hold mode makes the meter stop updating the display Data Hold fun
14. he Meter and in this manual are explained in chapter 1 2 1 1 Precautions safety measures 1 1 1 Preliminary As the possibilities of high transient overvoltages occurred in today s power systems increase more stringent safety standards are set for the electrical test equipment Transients on electrical systems power grid feeder or branch circuits will trigger a series of incidents that may result in serious personal injury To protect you against transients safty must be built into the test equipment 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL Overvoltage f category In brief Examples e Protected electronic equipment e Equipment connected to source circuits in which measures are taken CAT I Electronic to limit transient overvoltages to an appropriately low level e Any high voltage low energy source derived from a_highwinding resistance transformer such as the high voltage section of a copier Single phase e Appliance portable tools and other household and similar loads e Outlet and long branch circuits CAT II receptacle Outl han 10 f f CAT III connected loads utlets at more than 10 meters 30 feet from source e Outlets at more that 20 meters 60 feet from CAT IV source Three phase a a in fixed installations such as switchgear and polyphase distribution nh CAT II e Bus and feeder in industrial plants including Feed Jd shorb h circuits distributi devi single phase eeders and short branch circuits distri
15. nd T2 from LCD 3 2 9 PC Link The meter has serial data output function lt can be connected with PC by USB interface so the measured data can be recorded analyzed processed and printed by PC Before use this function you need install the PC Link software and USB driver in your PC PC LINK SOFT OPERATING MANUAL 1 Make sure the two Install USB driver and Install software files in the attached CD successfully installed before any measurement 2 Pressing HOLD key and last for 2 seconds will enter into PC LINK mode and the symbol PC LINK will appear on the LCD if the serial data output function is active 3 Connect the meter s OPTICAL PORT and computer USB port with the USB line 4 Select the default sampling rate or you can select other desired sampling rate 5 Now press the Start in the PC LINK SOFT to measure and view the synchronic data or graph in the software 21 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL interface 6 To disable the serial data output function press HOLD key and last for 2 seconds or switch the meter to OFF location More information about the PC LINK SOFT please refer to the Help topic including in the software or enter our website www mastech com cn 22 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 4 TECHNICAL SPECIFICATIONS 4 1 General specifications Environment conditions 1000V CAT III and 600V CAT IV Pollution degree 2 Altitude lt 2000m Operating temperature 0 40
16. re OL displayed it napale overrange situation and the higher range has to be selected 8 Turn off power to the circuit and discharge all high voltage emove the Meter and restore the circuit to normal capacitors operation 20 OFF open Oo S OFF open adi e gt NA ON close f A ma Figure 3 7 Measuring Current 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 3 2 8 Temperature measurement To avoid electrical shock and or damage to the instrument do not apply more than 250Vdc or 220Vac rms between the C terminal and the COM terminal To avoid electrical shock do not use this instrument when voltages at the measurement surface exceed 60v dc or 24v rms Ac To avoid damage or burns Do not make temperature measurement in microwave ovens To measure temperature 1 Set the rotary switch tol C F range OL symbol will be shown on both the main display and sub display if no thermocouple is input 2 Press SELECT key to select Cor F 3 Insert K type thermocouples into the COM and V terminal or mA and A terminal or you can insert it by using Multi Function Socket Takings care to observe the correct polarity 4 Touch the object with the thermocouple probe for measurement 5 Read the temperature values of T1 a
17. re true root mean square values which distinguishing this meter from the low grade meters which only can measure the AC average value 3 1 4 Relative measurement mode The Meter will display relative measurement in all functions except frequency To enter and exit the relative measurement mode 1 With the Meter in the desired function touch the test leads to the circuit on which you want future measurement to be based 2 Press RELA key to enter the relative measurement mode The meter remembers internally the instantaneously measured value called initial value when pressing the RELA key and the sub display shows this initial value The main display shows the relative value which being present value initial value The relative measurement value reflects the changes of the measured value It also can be used to take off the errors brought about by lead resistance or distributed capacitance during measuring low resistance and low capacitance 3 Press RELA key again to return the Meter to normal operation 3 1 5 Analog indication bar Analog indication bar is used for graphic measurement value and it always synchronizes with the value of the main display 3 1 6 Auto power off setting 1 The Meter enters the sleep mode and blanks the display if the Meter is on but not used for 15 minutes Press any key or rotate the rotary switch to wake the meter up 2 To disable the auto power off function hold down SELECT key while turning the meter on Then th
18. rvicing the Meter use only specified replacement parts Before opening up the instrument always disconnect from all sources of electric current and make sure you are not charged with static electricity which may destroy internal components Any adjustment maintenance or repair work carried out on the meter while it is live should be carried out only by 4 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL appropriately gualified 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 He is trained and authorized to energize and de energize circuits and equipment in accordance with established practices When the instrument is opened up remember that some internal capacitors can retain a dangerous potential even after the instrument is switched off If any faults or abnormalities are observed take the instrument out of service and ensure that it cannot be used until it has been checked out If the meter is not going to be used for a long time take out the battery and do not store the meter in high temperature or high humidity environment 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 2 DESCRIPTION 2 1 Instrument Familiarization Figure 2 1 The front panel is shown as in Figure 2 1 explanation being as
19. t calibration performance test and service information 5 1 General Maintenance A To avoid electrical shock or damage to the meter do not get water inside the case Remove the test leads and any input signals before opening the case Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents Dirt or moisture in the terminals can affect readings To clean the terminals Turn the meter off and remove all test leads Shake out any dirt that may be in the terminals Soak a new swab with a cleaning and oiling agent such as WD 40 Work the swab around in each terminal The oiling agent insulates the terminals from moisture related contamination 5 2 Fuse replacement A Before replacing the fuse disconnect test leads and or any connectors from any circuit under test To prevent damage or injury replace the fuse only with specified ratings Set rotary switch to the OFF position Disconnect test leads and or any connectors from the terminals Use a screwdriver to unlock the four screws on the rear cover Take out the rear cover from the meter Remove the fuse by gently prying one end loose then sliding the fuse out of its bracket Install the replacement fuses only with specified ratings F 0 25A 1000V 10 3x38 and F 10A 1000V 10 3x38 Rejoin the rear cover and tighten the screws NOOR WD 28 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 5
20. tage Do not use the Meter if it operates abnormally Protection may be impaired When in doubt have the Meter serviced Uses the proper terminals function and range for your measurements When the range of the value to be measured is unknown check that the range initially set on the multimeter is the highest possible or wherever possible choose the autoranging mode To avoid damages to the instrument do not exceed the maximum limits of the input values shown in the technical specification tables When the multimeter is linked to measurement circuits do not touch unused terminals 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 Before changing functions disconnect the test leads from the circuit under test For all dc functions including manual or auto ranging to avoid the risk of shock due to possible improper reading verify the presence of any ac voltages by first using the ac function Then select a dc voltage range equal to or greater than the ac range Disconnect circuits power and discharge all high voltage capacitors before testing resistance continuity diodes or Capacitance Never perform resistance or continui
21. trical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before measuring capacitance Use the dc voltage function to confirm that the capacitor is discharged Capacitance is the ability of a component to store an electrical charge The unit of capacitance is the farad F Most capacitors are in the nanofarad to microfarad range The Meter measures capacitance by charging the capacitor with a known current for a known period of time measuring the resulting voltage then calculating the capacitance The measurement takes about a few seconds per range To measure capacitance set up the Meter as shown in Figure 3 6 1 Set the rotary switch to 4F range 3 Connect the black and red test leads to the COM and 4 terminals respectively 4 Connect the test leads tip to the capacitor being measured 5 Read the displayed value from LCD NOTE The meter may take a few seconds to stabilize reading when measurement high capacitance To improve the accuracy of measurements less than 200nF subtract the residual capacitance of the Meter and leads 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL PC LINK RANGE RELA MAK MIN C HoLD za on gt w 2 AF Figure 3 6 Measuring Capacitance 19 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 3
22. ty measurements on live circuits Before measuring current check the meter s fuse and turn off power to the circuit before connecting the meter to the circuit In TV repair work or when carrying out measurements on power switching circuits remember that high amplitude 3 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL voltage pulses at the test points can damage the multimeter Use of a TV filter will attenuate any such pulses Use just one 6F22 battery properly installed in the Meter s battery case to power the Meter Replace the battery as soon as the battery indicator is less than one grid With a low battery the Meter might produce false readings that can lead to electric shock and personal injury Do not measure voltages above 1000V in Category Ill or 600V in Category IV installations When in REL mode the REL symbol is displayed Caution must be used because hazardous voltage may be present Do not operate the Meter with the case or part of the case removed 1 2 Symbols Symbols used in this manual and on the instrument A Caution refer to the instruction manual Incorrect use may result in damage to the device or its components AC Alternating Current DC Direct Current AC or DC Earth ground Double insulated Fuse 1 2 1 i lb a C Conforms to European Union directives 1 3 Instructions Remove test leads from the Meter before opening the Meter case or battery cover When se
23. ugh the circuit Because this current flows through all possible paths between the probes an in circuit resistance reading represents the total resistance of all paths between the probes To measure resistance set up the Meter as shown in figure 3 3 1 Set the rotary switch to Q range 2 Connect the black and red test leads to the COM and VQ terminals respectively 3 Connect the test leads tip to the circuit being measured 4 Read the displayed value NOTE In case of performing resistance test on circuit board it is necessary firstly to turn off the power of the circuit board and then perform the measurement As there may be other parallel circuits so the displayed value of test is not surely the actual value of the resistor 16 i mmnm 5 a MQ mp PC LINK Multimeter o Figure 3 3 Measuring Resistance 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 3 2 4 Continuity Check A To avoid electrical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before testing for Continuity To test for continuity set up the Meter as shown in Figure 3 4 1 Set the rotary switch to gt range 2 Connect the black and red test leads to the COM and Q terminals respectively 3 Connect the test leads tip to the resistance in the circuit being measured 4 When the test lead to the circ
24. uit is below 40Q a continuous beeping will indicate it NOTE Continuity test is available to check open short of the circuit Figure 3 4 Checking the Continuity 17 20000 COUNTS DIGITAL MULTIMETER USER S MANUAL 3 2 5 Diode Test A To avoid electrical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before testing diodes To test a diode out of a circuit set up the Meter as shown in Figure 3 5 1 Set the rotary switch to gt range 2 Press the SELECT key once to activate Diode Test 3 Connect the black and red test leads to the COM and VQ terminals respectively 4 For forward bias readings on any semiconductor component place the red test lead tip on the component s anode and place the black test lead tip on the component s cathode 5 The meter will show the approx forward voltage of the diode If the polarity of test leads is reversed OL will be displayed In a circuit a good diode Silicon should still produce a forward bias reading of 0 5V to 0 8V however the reverse bias reading can vary depending on the resistance of other pathways between the probe tips 18 Forward Bias Anode Z Cathode at Reverse Bias Cathode KE Anode Figure 3 5 Testing a Diode 3 2 6 Capacitance measurement To avoid elec
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