TX-DMMTM TX1 and TX3 True HMS Digital Multimeters User Manual
Contents
1. 18V AA 1 Wu g E resur C Ko TEKTRONUX BEAVERTON OR U S A Made in U S A To replace batteries or tuso duo o 1 Press and hold options Activate by holding down the specified button for two seconds while the meter is on 2 Power up options Activate by holding down the specified button while turning on the meter 3 Compliance and battery and fuse replacement information 4 Serial number and barcode tag 5 Removable battery cover and TY Tens DME Ninital Multimatarc Front and Rear Panel Overview Display Indicators jM MAX MINAVG A n N A Dal 1000500 om n n m BLUE mmFMKOHzmVAS 7 41 7 10 51 Re al F Ir 389 RRE lACrDCI dBmA i EXITOK bec Y 1 Special feature indicators 6 Upper display 2 Low battery indicator 7 Upper display units 3 Delta indicator 8 Main display 4 Blue button and memory 9 Main display units mode indicators 10 Range indicators 5 Bargraph 11 Softkey menus TXI and TX3 Troe Niaital Multimatare Front and Rear Panel Overview Measurement Function Knob om op Hz A Hz Ye v v A L OFF OFF TX TX3 OFF Turns off the meter Setup parameters and stored measurements are saved V Volts AC RMS Volts DC Volts AC DC dual di2. Trna BMG Dieital Multimatarc Special Features High Resolution HrES 50 000 Count Mode By default the meter is set to 5 000 count mode For 50 000 count mode press the blue button when you turn on the meter To change the default resolution to 50 000 count mode use the Setup menu information on page 23 The following measurements are limited to 5 000 count mode 50 50 MQ I ms peak hold AC DC amps AC DC amps AC DC volts AC DC volts capacitance and Hertz dual display mode Beeper A single beep indicates correct operation You can turn the single beep feature off in the Setup menu A double beep indicates a warning or error condition A triple beep indicates the meter will auto off in one minute Continuous beeping indicates there is circuit continuity while in continuity mode You can not disable double triple or continuous beeps Auto Off The auto off feature automatically turns off the meter if no controls or settings are changed within a set amount of time To turn on the meter after auto off press any button The meter will return to the state it was in before auto off occurred but held values are lost Use the Setup menu to adjust the auto off delay The default auto off time is thirty minutes You can disable auto off by pressing the button when you turn on the meter or by using the Setup menu Auto off is disabled during M M A mode Special Features Power Up Options To activate po
3. Observe the safe test lead connections below when you remove the test leads from the meter Always disconnect power to the circuit when you measure resistors capacitors diodes or continuity within the circuit Discharge capacitors before taking capacitance measurements Safe Test Lead Connections A To safely disconnect the test leads from the meter first disconnect all test leads from the circuit being tested then disconnect the leads from the input connectors WARNING To prevent electrical shock do not insert unnecessary test leads or metal pins into the A amps connector Voltages applied to any connector may be present at all other input connectors Only use the test leads supplied or recommended or their equivalent with the meter Refer to Accessories on page 43 1 and TX3 True RMS Digital Multimeters Operating Basics Using Procedures in this Section All measurements are made by first setting the measurement function knob to a function setting and then selecting a measurement from the softkeys Note that not all knob settings have corresponding softkey settings For example the steps below show how to make a DC voltage measurement 1 Set the measurement function knob to V for a voltage measure ment 2 Select softkey 2 for DC voltage AC DC AC DC dBmA 7 amp a 2 0 it 3 Connect the leads to the measurement points TXI and
4. Follow the steps below to access and replace the service replaceable Servicing TX Series Multimeters fuse 1 Remove the battery cover Remove the batteries and two screws EL et on both sides of the batteries The information in this section shows you how to replace fuse F1 2 Carefully insert a screw driver between the gasket and meter case Only qualified personnel should perform service procedures Read and gently lift and remove the gasket You must remove the this Service Safety Summary and the General Safety Summary before gasket before opening the meter case performing any service procedures Remove 2 screws 211 0927 XX Do Not Service Alone Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present Use Care When Servicing with Power On Dangerous voltages or currents may exist in this product Disconnect power remove battery if applicable and disconnect test leads before removing protective panels soldering or replacing components To avoid electric shock do not touch exposed connections Service only in a clean dry environment Annual calibration verification is recommended Remove gasket part number 354 0748 XX WARNING Installing improper fuses can cause injury and product damage 48 TXI and TX3 True RMS Digital Multimeters TXI and TX3 True RMS Digital Multimeters 49 Servicing TX
5. 3 While in C or F mode allow the temperature reading to stabilize on a value this value should be very close to 0 C for C mode or 32 0 F for F mode Any deviation from 0 C or 32 F represents the thermocouple s offset 4 Once the reading stabilizes press and hold softkey for C mode or softkey 2 for F mode for five seconds until the display shows 0000 or 0032 This calibrates the meter for the operating environment A shows in the upper display If you hear an error beep the offset is greater than 5 C You can repeat this calibration at any time To undo this calibration return the meter to factory settings by pressing both the blue button and M M A button while powering up the meter see Table 2 on page 27 To insure accuracy of temperature measurements you should follow this procedure when using other K type thermocouple probes with the TX Series DMMs because accuracy specifications vary in different types of probes NOTE Observe proper polarity on the probe adapter and do not calibrate the offset immediately following high amperage measure ments and TX3 True RMS Digital Multimeters 17 Operating Basics curent Measurements Main display Measurement Connect leads True RMS AC Amps DC Amps default display Amps AC DC dual display Current Load AC DG pressito Amps AC DC total RMS toggle P o 4 20 mA current 2 20
6. 1 5 000 count mode only TXI and TX3 True RMS Dieital Multimeters Specifications Table 22 Physical characteristics Characteristic Description Dimensions H x W x D 38 mm 88 mm x 183 mm without holster Weight with batteries 383 g 13 5 oz With holster 539 g 1 Ib 3 oz Table 23 Environmental characteristics eee Characteristic Description Temperature Operating 1010 450 C Non operating storage 40 to 60 C T Humidity 40 to 435 C lt 80 35 to 440 lt 70 40 to 60 C lt 55 Altitude Operating 2 000m 6 562 ft For altitudes from 2 000 m up to 5 000 m 16 404 ft derate voltage input to 600 VAC CAT Ill Non operating storage 12 300 m 40 354 ft Vibration Operating 2 66 Gams 5 to 500 Hz 3 axes 10 minutes each 3 48 gnus 5 to 500 Hz 3 axes 10 minutes each Non operating 40 TXI and TX3 True RMS Digital Multimeters Specifications Table 24 Certifications and compliances Category Standards or description O EC Declaration of Conformity Meets intent of Directive 89 336 EEC for Electromagnetic Compatibility Compliance was demonstrated to the following specifications as listed in the Official Journal of the European C
7. 39 4 20 mA measuring 18 50 ohm measuring 14 A AC coupled measurement 13 AC current specifications 35 AC DC applications 9 AC voltage specifications 32 33 AC DC applications 9 AC DC current accuracy 35 accessories 43 44 altitude specifications 40 Amps input connector 5 applications AC DC voltage 9 AC DC voltage 9 dB and dBm 10 11 measuring low resistance 14 auto hold 21 auto off 24 25 and M M A 25 disabling 25 27 average AVG 19 28 backlight 20 timeout 24 26 batteries life of 30 low voltage indicator 30 power up test 27 bEEP 24 beeper 24 25 blue button 19 C calibration annual verification 48 temperature 16 calibration date 26 capacitance measuring 6 15 specifications 37 certifications and compliances 41 CHEC ProbE 18 cleaning 51 clearing memory 23 CLR 23 COM input connector 5 continuity measuring 14 specifications 37 current measuring 18 D dB applications 10 11 changing reference value 24 dB and dBm measuring 10 dBm applications 10 11 DC coupled measurement 13 DC current specifications 34 DC voltage specifications 31 delta default setting 24 drEF 24 rEF 22 24 relative to measured value 21 Index relative to programmed value 22 relative to saved value 21 diagnostics at power up 27 diode measuring 14 specifications 37 disconnecting test leads 6 display LCD 3 24 dust resistance 30
8. Series Multimeters A 50 3 Carefully lift the rear panel of the meter up to access the fuse F1 Remove and replace the fuse Refer to Table 25 on page 43 for more information on which fuse to use WARNING Installing improper fuses can cause injury and product damage 4 Verify meter calibration after replacing F1 Fuse F1 TXI and TX3 True RMS Digital Multimeters General Care and Cleaning gt gt Protect the meter from adverse weather conditions Do not expose the LCD display to direct sunlight for long periods of time CAUTION To avoid damage to the meter do not expose the interior of the meter to sprays liquids or solvents Clean the exterior of the meter by removing dust with a lint free cloth Use care to avoid scratching the clear plastic display filter For further cleaning use a soft cloth or paper towel dampened with water You can use an alcohol free glass cleaner for more efficient cleaning CAUTION To avoid damage to the surface of the meter do not use abrasive or chemical cleaning agents WARNING The meter is not protected from exposure to water Exposing the meter to water can create a shock hazard If the meter is exposed to water open the case and allow the meter to fully dry To open the meter use the procedure in the Servicing TX Series Multimeters section 1 and TX3 True RMS Digital Multimeters 51 Index Ims peak hold 20
9. TX3 True RMS Disital Multimeters 7 Operating Basics 5 Voltage Measurements Main Upper Measurement Softkey Connect leads display display True RMS AC voltage AC A WON Y AC Hz default DC voltage DC L 4 dC i AC DC dual display C BAC DC or ON v DC AC AC DC press to AC DC total RMS toggle AC DC Hz 00 Veus VAC VDC TVI and TV Tess DMC Ninital Meltimatares Operating Basics Application Using AC DC and AC DC in Volts Mode AC Vnus Frequency 60 Hz AC voltages riding on power supplies can cause problems with electronic circuits If you set the meter to DC Volts mode the display shows the DC component of 5 000 V However the AC component may be missed It is recommended that you set the meter to AC DC dual display mode The main display shows the 5 000 V DC voltage and the upper display shows the 1 000 V AC voltage AC DC mode also allows you to simultaneously make AC and DC measurements without changing the meter settings Another useful measurement is AC DC total RMS To take this measurement press softkey 3 to toggle to AC DC In the above example the total RMS of 5 099 V shows on the main display and the frequency of 60 00 Hz shows on the upper display When calculating the power dissipated in a circuit component it is critical that the DC value is factored into the equation Vrms X Igys where Vems is AC DC total RMS TV 1
10. TX3 only mA 1 VIAC IDC 2 4 20 mA measurement is used in process loop calibration measured current 4 16 mA When overrange occurs in manual range the meter will uprange in order to protect the internal circuitry measurements to 10 A for three minutes or 15 A for 30 seconds and allow ten minutes of cooling between measurements Do not connect CAUTION To avoid damaging the meter limit large current to circuits with 7600 V Do not attempt to measure current with batteries removed Button and Softkey Overview 18 When you exit current measurement mode the words CHEC ProbE show on the display reminding you to remove your test lead from the A amps input connector When you make high current measurements gt 15 A use a current clamp probe optional accessory connected to the volts input connector TXI and TX3 True RMS Digital Multimeters Blue Button To access functions in blue text press the blue button and then press a function button while the indicator is on The indicator shows on the display for five seconds Press and hold the blue button for two seconds to access the Setup menu See page 23 for more information about the Setup menu RANGE Button Use the RANGE button to manually select a range Press and hold RANGE for two seconds to return the multimeter to auto range mode The meter is in auto range mode when the indicator is on The range and units a
11. adjust the setting for the backlight HOLD Button Press HOLD to turn hold mode on and off When you activate the hold feature the instrument beeps freezes the display and displays the indicator Hold mode freezes the display so you can remove the probes from the test points without losing the measure ment reading 1 and TX3 True RMS Digital Multimeters Button and Softkey Overview Auto Hold To activate auto hold press down on the HOLD button until appears on the display Auto hold is not available for capacitance or AC DC measurements In auto hold mode the display automatically freezes and the instrument beeps when the measurement reading stabilizes The displayed value will be updated when the meter stabilizes on a new measurement value Auto hold is useful when it is not possible for you to press the HOLD button or see the meter display while probing and taking measure ments A Button Making Relative A DELTA Measurements Use this button to set the meter to delta mode and make relative measurements The reference value for the A measurement can be a measured a stored or a programmed value Relative to a Measured Value When you take the measurement and the meter settles on the measurement value press the A button For subsequent readouts the measured reference value is subtracted from the actual measurement Relative to a Saved Value Use the measurement function knob and softkeys to set
12. factor duty 1 a b 100 12 TXI and TX3 True RMS Digital Multimeters TXI and TX3 True RMS Digital Multimeters 13 Operating Basics Taal Resistance Measurements Ohms Continuity Diode and 500 Range Measurement Connect leads Resistance default Continuity 2 OPEn or Shrt beeps on short Diode gt t Forward bias Reverse bias pi n 1 Application Measuring Low Resistance Values See application below To measure low resistance values to 0 01 Q resolution set the meter to 50 mode and short the leads together to subtract the lead resistance from low resistance measurements If you do not short the leads together the meter will not enter 50 mode The lead resistance must be less than 5 The measured resistance shows on the main display CAUTION To avoid damaging the meter remove all power from the circuit before connecting the test leads 14 and TX3 True RMS Digital Multimeters Operating Basics D Capacitance Measurement Main Softkey Connect leads display no selection ES F Upper display Measurement Capacitance CAUTION To avoid damaging the meter remove all power from the circuit before connecting the test leads Measuring large value capacitors may take several seconds Follow the procedures below when making capacitance measure ments m Remove cap
13. the meter to the measurement function you want Use the memory information on page 22 to recall RCL a reference value from memory then press the A button To exit delta mode press the A button For subsequent readouts the recalled reference value is subtracted from the actual measurement TXI and TX3 True RMS Digital Multimeters 21 Button and Softkey Overview A Relative to a Programmed Value Use the measurement function knob and softkeys to set the meter to the measurement function and range you want and then press the A button While the meter is in delta mode press and hold the blue button until the Setup menu appears Use the softkeys to edit rEF to the desired value and press softkey 4 for OK To exit delta mode press the A button For subsequent readouts the programmed reference value is subtracted from the actual measurement The programmed reference value is lost when you turn off the meter You can also use the A button to make relative dB AdB measure ments See page 10 for more information MEM Memory Use the memory mode to store and recall measurement values No data is lost during power cycles To activate the MEM memory mode press the blue button and then the A button while shows on the LCD display The display shows four softkey selections STO RCL CLR and EXIT STO Select STO to store the held value in the next available memory location The memory location number momentarily shows on the upp
14. 4 specifications 36 resolution 25 reverse bias 14 S safe test lead connections 6 Setup menu 23 accessing 19 activating 23 auto off 25 saving as defaults 23 shorting leads 14 Shrt 14 softkeys 23 software calibration date 26 software version 26 standard accessories 43 STO 22 storing in memory 22 T temperature measuring 16 specifications 39 40 thermocouple type 39 thermocouple offset calibration 16 thermocouple offset calibration 16 verification 16 45 V vibration specifications 40 voltage AC DC 8 applications 9 AC DC 8 applications 9 changing range 13 dB applications 10 11 dBm applications 10 11 DC 8 DC specifications 31 measuring 8 true RMS AC 8 Volts input connector 5 VnMs equation 8 W water resistance 30
15. 7 Frequency characteristics resolution and accuracy Characteristics Description enn DAR Signal coupling AC Minimum frequency 0 5 Hz Maximum 1 MHz frequency Accuracy 0 002 1 count Best resolution 10 000 count 0 01 Hz 100 000 count 0 001 Hz Temperature Add 0 00004 C beyond rated temperature range coefficient Table 18 Frequency voltage range Sensitivity 10 Hz 100 kHz Sensitivity 1 MHz 500 mV 100 mV 5V 500 50V 5V 500V 50V 1 For voltages gt 100 V the maximum volts Hz product is lt 10 MVHz 38 1 and TX3 True RMS Digital Multimeters Specifications Table 19 Duty factor characteristics Characteristics Description Range 1 Hz to 100 kHz Accuracy 0 1 0 05 per kHz for 5 V input logic signals only Signal coupling DC Resolution 0 1 Sensitivity 30 of range Table 20 Temperature characteristics ra M Characteristics Description Main display Range 50 C to 980 C Accuracy 3 C typical Thermocouple type K Upper display Accuracy t 3 C of ambient temperature typical 1 Use the water and ice offset calibration method on page 16 for accuracy to 1 0 C Table 21 1ms peak hold characteristics Characteristics Accuracy Description Specified voltage or current measurement 30 counts of the peak value of a single 1ms pulse
16. ANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Contacting Tektronix Product Support Service Support For other information To write us For application oriented questions about a Tektronix measurement product call toll free in North America 1 800 TEK WIDE 1 800 835 9433 ext 2400 6 00 a m 5 00 p m Pacific time Or contact us by e mail tm_app_supp tek com For product support outside of North America contact your local Tektronix distributor or sales office Contact your local Tektronix distributor or sales office Or visit our web site for a listing of worldwide service locations http www tek com In North America 1 800 TEK WIDE 1 800 835 9433 An operator will direct your call Tektronix Inc P O Box 1000 Wilsonville OR 97070 1000 Table Contents General Safety Summary eese Front and Rear Panel Display Indi GBtOS ve anm men oc See ae rh pm HOR Measurement Function Knob Input ava s em x gam SO ap E LR BD E Operating Basle
17. Digital Multimeters Accessories This section lists all standard and optional accessories for the TX1 and TX3 true RMS digital multimeters Table 25 Standard accessories Standard accessory Test lead set Product or part number ATLO1 or equivalent Test leads Certified to 1000 V CAT III 1 red 1 black Alligator clips Certified to 1000 V CAT III 1 red 1 black Protective boot 650 3681 XX or equivalent User Manual Language Pan Number Language Part Number English 070 9880 XX Portuguese 070 9885 XX French 070 9881 XX Korean 070 9886 XX German 070 9882 XX Simplified Chinese 070 9887 XX Italian 070 9883 XX Traditional Chinese 070 9888 XX Spanish 070 9884 XX Tem 070 9889 XX Installed dry cell batter ies Two AA 1 5 V alkaline batteries IEC LRG or ANSI NEDA 15 Fuse installed 15 1000 Vrms 159 0409 XX Littelfuse or 11 A 1000 V Buss DMM B 11 service replaceable Temperature probes TX3 only ATKO1 or equivalent K type thermocouple adapter and ATPO1 or equivalent bead probe TXI and TX3 True RMS Digital Multimeters 43 Accessories Table 26 Optional accessories Optional accessory Probing solutions Product or part number ATL21 ATL22 ATL23 ACL21 ACL22 ACL23 ACL24 Nylon softcases AC12 AC13 Clamp on current probes A605 A621 A622 Cables and software WSTRM TX1 and TX3 070 9893 XX
18. Service Manual 44 TXI and TX3 True RMS Digital Multimeters Setup for Optional Computer Interface Accessory WSTRM Follow the steps below to set up the computer interface accessory 1 Press the plastic receptacle into place in the top of the DMM protective boot Connect the WSTRM cable to the plastic receptacle WSTRM cable A Plastic receptacle 9 pin connector 2 Connect the other end of the WSTRM cable to your computer using the 9 pin connector If you require a 24 pin connection to your PC you will need to use a 9 pin to 24 pin adapter 3 Insert WSTRM CD ROM into your computer drive and proceed with software installation Refer to the WSTRM documentation for further instructions on using WSTRM You can find further information about WSTRM features on the WSTRM CD ROM 1 and TX3 True RMS Digital Multimeters 45 46 Using Protective Boot and Versa Stand M TXI and TX3 True RMS Digital Multimeters Battery Replacement Batteries 2 AA alkaline or rechargeable Battery cover When you replace a battery the multimeter calibration is not affected and the stored data is not lost Remove the battery cover only in a clean dry environment See Table 25 on page 43 for the descriptions and part numbers of the replaceable batteries TXI and TX3 True RMS Digital Multimeters 47 Servicing TX Series Multimeters
19. Tektronix TX DMM TX1 and TX3 True RMS Digital Multimeters User Manual 070 9880 00 Ce Copyright Tektronix Inc All rights reserved Licensed software products are owned by Tektronix or its suppliers and are protected by United States copyright laws and international treaty provisions Use duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 or subparagraphs 1 and 2 of the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 as applicable Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Printed in the U S A Tektronix Inc Box 1000 Wilsonville OR 97070 1000 TEKTRONIX and TEK are registered trademarks of Tektronix Inc WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of three 3 years from the date of shipment If a product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this war
20. acitors from circuitry Discharge capacitors before measuring them m Connect polarized caps as shown above m To measure small values of capacitance accurately press the A button when the leads are open TXI and TX3 True RMS Digital Multimeters 15 Operating Basics e Temperature Measurements TX3 only Measurement Connect leads Celsius temperature F C Ambient default 1 1 temp C Thermocouple Fahrenheit temperature F oF Ambient ATPO1 K Type temp oF Temperature probe 16 Before you take a temperature measurement momentarily change the temperature of the thermocouple to verify a shorted or open thermocouple is not incorrectly displaying the ambient temperature Helpful Tip Increased Temperature Accuracy To achieve high accuracy temperature measurements to 1 0 C it is necessary to calibrate the meter to account for any thermocouple offset Temperature accuracy without performing the following calibration is 3 C 1 Turn on the meter in the environment you will make the measurements 2 Fill a wide shallow container with ice and water Stir the ice and water mixture for two or three minutes to evenly distribute the temperature of the mixture Place the container next to the meter and submerge the tip of the bead probe in the ice and water and TX3 True RMS Digital Multimeters Operating Basics
21. and TY Tena DMC Dinital Maleimatace Operating Basics e dB and dBm Voltage Measurements Measurement Softkey dB TX3 only dBm TX3 only Main display Connect leads dB or dBm press to toggle 1 2 10 dB readout 20 x log main display readout ref where ref 1 V is the default dBm readout 10 x log main display readout R where R 600 Application Using a Reference Value Other than Default 1 000 Vans in dB Mode To manually change the reference voltage in dB mode press and hold the blue button to display the Setup menu Adjust the rEF dB value to the value you want and press softkey 4 for OK Subsequent dB measurements will use this stored value as the reference voltage until you turn off the meter 1 and TX3 True RMS Digital Multimeters Operating Basics Application Using Voltage in a Circuit as the Reference Value in dB Mode An example of using a voltage in a circuit as the reference value is measuring the AC voltage gain of an amplifier Set the meter to dB mode and measure the voltage that you want to use for the reference the input of the amplifier Press the A button to save the measured value as the reference value Next measure the output of the amplifier The voltage gain of the amplifier in dB shows in the upper display In both of these applications the A indicator shows in the upper display to indicate the reference is a voltage other
22. cations Table 8 DC current characteristics Characteristics Description Burden voltage 5 mA to 5 A 0 3 V max 10 0 5 V max Percent 4 20 mA 4mA 0 calculated in 20 mA 100 50 mA range Settling time 4 readings typical Reading rate 5 000 ct 4 readings per second 50 000 ct 1 reading per second Table 9 DC current range resolution and accuracy a a Resolution Accuracy Range 5 000 counts 50 000 counts TX1 TX3 500 WA 100nA 10nA 0 2 4 counts 5mA ipa 100 na 0 2 2 counts 50 10pA 1pA 500mA 100 uA 10 pA 5A 1mA 100 uA 0 4 2 counts 10 Afor 10 1 0 8 2 counts eth 15 A for 30 sec Temperature coefficient Add 0 05 0 1 ct C beyond rated temperature range 1 Accuracy in 50 000 count mode is 40 counts Accuracy in 50 000 count mode is 20 counts 34 1 and TX3 True RMS Digital Multimeters Specifications Table 10 AC current chi aracteristics Characteristics Description Burden voltage 0 5 mA to 5 A 0 9 V max 10 A 1 0 V max AC DC Accuracy AC RMS amps accuracy DC amps accuracy Upper display frequency Accuracy 0 002 1 count for 20 Hz to 5 kHz Sensitivity 10 of range Settling time 4 readings typical Reading rate 5 000 ct 4 readings per second 50 000 ct 1 reading per second 5 000 count mode only Table 11 AC current range res
23. duty factor negative 12 POL 24 positive 12 specifications 39 E EdGE 24 edge triggering default setting 24 F factory default settings 27 forward bias 14 frequency measuring 12 13 edge triggering 24 specifications 38 fuse auto detection 29 replacing fuse 1 49 H high impedance 26 high resolution 24 25 26 HOLD 20 and M M A 20 24 26 humidity relative 40 TEC 529 IP64 30 input connectors 5 L LCD 3 27 enunciators 3 power up test 27 LOFF 24 low resistance applications 14 M M M A 28 second 26 1 ms peak detect exiting 20 1 peak hold 20 and upranging 29 AVG 28 button 19 disable downranging 29 exiting 19 29 live 28 MAX 28 MAX MIN 28 MIN 28 recording rate 28 maximum MAX 28 maximum minimum MAX MIN 28 measurement function knob 4 power up diagnostics 27 memory CLR 22 23 EXIT 22 RCL 22 23 Index Index STO 22 minimum MIN 28 N negative duty factor 12 negative edge triggering 12 0 OPEn 14 optional accessories 44 24 POL 24 positive duty factor 12 power up options 26 process control measurements 18 protective boot uses 46 R range auto range mode 19 button 19 changing 13 default value 13 RCL 23 recalling from memory 23 TEF 24 reference value db 10 H in a circuit 11 other than 1 000 VRMS 10 rESEt 27 resistance measuring 1
24. e RMS Digital Multimeters Special Features Table 2 Power up options Cont OO Button Power up function Explanation Softkey 2 Overall Diagnostics Displays all LCD segments Press softkey 2 again to hear the beeper Press softkey 2 again to perform button and knob diagnostics The display shows two two digit numbers The numbers on the left confirm the knob location and the numbers on the right confirm the button operation To exit diagnostics turn off meter Softkey3 LCD test Displays all LCD segments so you can verify correct LCD operation and display Compare this to the LCD figure on page 3 Softkey 4 Battery test Displays the voltage across the battery terminals The meter will shut off at 1 5 V HOLD Disables auto off BLUE Resets meter to factory You must press both buttons at the same time M M A default settings while powering on the meter rESEt voaa The bolded text in parentheses in the Button column shows when the meter registers the power up setting Do not release the button until you either hear a single beep or see the text TX1 and TX3 True RMS Digital Multimeters 27 Special Features MAX MIN AVG Operation Press the M M A button to start recording M M A values In 5 000 count mode the M M A default recording rate is 4 measurements per second Press and hold the M M A button when turning on the meter to apply averaging which red
25. er display If no memory locations are available FULL shows on the upper display for two seconds and nothing is stored To overwrite an existing memory value recall the memory location using the RCL button press CLR then press STO to store the new value in this location and TX3 True RMS Digital Multimeters Button and Softkey Overview RCL Select RCL to scroll through the stored values in reverse order The upper display momentarily shows the memory location while the main display shows the value stored in that location CLR Select CLR to clear the currently selected memory location The location is replaced with A To clear all memory locations press and hold the CLR button for five seconds shows on the display next to the CLR enunciator The word donE shows on the display indicating that all memory locations are clear and you can release the button If you release the button before the word donE shows no data is cleared from the memory EXIT Select EXIT to exit memory mode You can also exit memory mode by pressing any button Softkeys Each setting on the measurement function knob may activate one or more softkey settings on the LCD If there is more than one measurement for a function knob setting a softkey menu appears on the display Press the corresponding softkey to select the desired measurement Setup Menu The Setup menu allows you to customize default settings To activate the Setu
26. erly Replace batteries only with the proper type Specifications 30 and rating specified ACCOSSOFIES s tees soss does 43 Do Not Operate Without Covers Do not operate this product with Setup for Optional Computer Interface covers or panels removed Accessory WS ERM o somo ocu torni nte 8 ans 45 Use Proper Fuse Use only the fuse type and rating specified for this Using Protective Boot and Versa Stand 46 product Battery Replacement 47 Avoid Exposed Circuitry Do not touch exposed connections and components when power is present Servicing TX Series Multimeters 48 Do Not Operate With Suspected Failures If you suspect there is damage General and Cleaning 51 to this product have it inspected by qualified service personnel INGER aio sane cux aes qvo ques pee gues durs uu TUS VE 52 Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere Keep Product Surfaces Clean and Dry General Safety Summary Safety Terms and Symbols Front and Rear Panel Overview Terms in This Manual These terms may appear in this manual A WARNING Warning statements identify conditions or practices that ET could result in injury or loss of life B 88 im Dm 3B jn AN CAUTION Caution statements identify conditions or practices that could result in damage to this prod
27. ing per second Common mode 60 dB at DC to 60 Hz rejection ratio Crest factor maximum Full scale 3 Half scale 6 AC DC total RMS volts accuracy AC RMS accuracy 0 1 1 count AC DC dual display accuracy DC Accuracy 0 05 1 count AC RMS Accuracy 0 1 1 count Upper display frequency 5 000 counts Accuracy 0 002 1 count for 20 Hz to 20 kHz Sensitivity 10 of selected voltage range dB reference 1 Vams adjustable dBm reference 775 mV across 600 1 mW 5 000 count mode only 2 See page 10 for dB and dBm calculations 32 TX1 and TX3 True RMS Digital Multimeters Specifications Table 7 AC voltage range resolution and accuracy M Resolution Accuracy Range 5 000counts 50 000 counts TX1 TX3 05V 100 pV 10 pV 40 Hz 20 kHz 40 Hz 20 kHz 5 1 100 uV 0 6 2 counts 0 4 2 counts 50V t0mV inv 500V 100mV 10 mV 1000V 1V 100 mV 40 Hz 10 kHz 40 Hz 10 kHz 0 6 2 counts 0 4 2 counts Temperature coefficient AC Add 0 03 0 1 ct C beyond rated temperature range AC DC Add 0 06 0 1 ct C beyond rated temperature range 1 Accuracy in 50 000 count mode is 20 counts For voltages gt 100 V the maximum volts Hz product is lt 10 MVHz TXI and TX3 True RMS Digital Multimeters Specifi
28. olution and accuracy HM MMM M Resolution Accuracy Range 5 000counts 50 000 counts TX1 TX3 0 5 100 10 nA 40 Hz 1 kHz 0 6 2 counts 5mA 1 pA 100 nA 1 kHz kHz 1 0 2 counts SOmA 10 HA 3 kHz 5 kHz 2 0 2 counts 500 100 uA 10 pA 5A 1mA 100 pA 10Afor 10 1mA 3 minutes 15A for 30 sec Temperature coefficient Add 0 05 0 1 ct C beyond rated temperature range 1 Accuracy in 50 000 count mode is 20 counts 5 of range and TX3 True RMS Digital Multimeters 35 Specifications Table 12 Resistance Q characteristics Characteristics Description Update rate 5 000 ct 2 readings per second 50 000 ct 1 reading per second 50 MC 1 reading per second Settling time 50 Q to 5 MQ range 3 readings typical 50 MQ range 4 readings typical Compliance 0 6 V 50 and 500 range is 1 3 V voltages typical Common mode 60 dB at DC 50 Hz or 60 Hz rejection ratio Normal mode 20 dB at gt 50 Hz rejection ratio Table 13 Resistance range resolution and accuracy Resolution Accuracy Range 5 000 counts 50 000 counts TX1 TX3 500 001Q 0 1 10 counts 5000 010 0010 0 1 4 counts 5kQ 10 010 0 1 2 co
29. ommunities EN 55011 Class A Radiated Emissions EN 50082 1 Immunity IEC 801 2 Electrostatic Discharge Immunity IEC 801 3 Electromagnetic Field Immunity Australia New Zealand Declaration of Conformity EMC Complies with EMC provision of Radiocommunications Act per the following standard s AS NZS 2064 1 2 Class A Radiated Emissions EC Declaration of Conformity Low Voltage Compliance was demonstrated to the following specification as listed in the Official Journal of the European Communities Low Voltage Directive 73 23 EEC as amended by 93 69 EEC EN 61010 1 A2 1995 Safety requirements for electrical equipment for measuring control and laboratory use U S Nationally Recognized Testing Laboratory Listing UL3111 1 Standard for electrical measuring and test equipment Canadian Certification CAN CSA C22 2 No 1010 1 Safety requirements for electrical equipment for measurement control and laboratory use Additional Compliance 1EC61010 1 A2 1995 Safety requirements for electrical equipment for measurement control and laboratory use and TX3 True RMS Digital Multimeters 41 Specifications Table 24 Certifications and compliances cont eee Category Installation Category Descriptions Standards or description Terminals on this product may have different installation category designations The installation categories are CAT III Dist
30. p menu press and hold the blue button for two seconds Use the softkeys as shown in the following table to edit setup values Setup menu values are saved when you turn off the meter except for reference values TXI and TX3 True RMS Nicital Multimeterc an Button and Softkey Overview Press to increase Press to de setting value crease setting value Function Press to save setting and move to next setup pa rameter Press to step to next digit in set ting value The following table lists the setup menu prompts the definition of parameters and default values Table 1 Setup prompts definitions and default values Upper display Definition of parameter Default prompt press OK to cycle through parameters value POFF Sets auto off time in minutes 30 minutes LOFF Sets backlight auto off time in seconds 60 seconds bEEP Toggles beeper on and off ON HrES Changes display to 50 000 counts OFF POL Duty Scrolls through OFF POS positive duty factor and OFF NEG negative duty factor EdGE Hz Toggles between POS positive edge and NEG Positive rising negative edge triggering in Hz measurement Changes the reference value for delta measure Value before A ments button is pressed A rEF dB Changes the reference value for dB measurements 1V Meter must be in A or dB mode to access these setup parameters 24 and
31. ranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer Shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARR
32. re displayed above the indicator to the right of the bargraph M W A Minimum Maximum and Average Button Press this button to scroll through the live maximum minimum maximum minimum and average value The elapsed time between the last recorded event and the start of the test shows in the upper display Press and hold the M M A button for two seconds to exit M M A mode See MAX MIN AVG Operation on page 28 for more information TX1 and TX3 True RMS Digital Multimeters 19 Button and Softkey Overview 1ms 1 ms Peak Hold To activate ms peak hold first press the blue button and then the M M A button while the indicator shows on the display When in ms mode the LCD displays the and indicators Display resolution in 1ms peak hold is 5 000 counts Live and average AVG readings are not available in Ims peak hold mode You can use 1ms peak hold when you take AC or DC measurements The meter only records events that have a pulse width that is greater than ms Press the M M A button to view Ims peak hold minimum and maximum values The MAX value shown is the value of the positive peaks and the MIN value shown is the value of the negative peaks Press and hold the M M A button for two seconds to exit Ims peak hold mode Backlight Button Press the button to turn the backlight on or off Adjust the LOFF setting in the Setup menu to adjust the backlight timeout setting Use the Setup menu information on page 23 to
33. ribution level mains usually permanently connected Equipment at this level is typically in a fixed industrial location CAT II Local level mains wall sockets Equipment at this level includes appliances portable tools and similar products Equipment is usually cord connected Pollution Degree A measure of the contaminates that could occur in the environment around and within a product Typically the internal environment inside a product is considered to be the same as the external Products should be used only in the environment for which they are tested Pollution Degree 2 Normally only dry nonconductive pollution occurs Occasionally a temporary conductivity that is caused by condensation must be expected This location is a typical office home environment Temporary condensation occurs only when the product is out of service Pollution Degree 3 Conductive pollution or dry nonconductive pollution that becomes conductive due to condensation These are sheltered locations where neither temperature nor humidity is controlled The area is protected from direct sunshine rain or direct wind Add 25 counts 250 counts in 50 000 count mode to the accuracy specifications when in the presence of an RF field as defined in IEC801 3 Amps DC Add 60 counts 600 counts in 50 000 count mode to the amps accuracy specifications when in the presence of an RF field as defined in IEC801 3 42 TXI and TX3 True RMS
34. s pe pui sous eases eens Safe Test Lead Connections skie aes e osae mem tea Using Procedures in this Section Voltage Measurements Application Using AC DC and AC DC in Volts Mode dB dBm Voltage Measurements Application Using a Reference Value Other than Default 1 000 VRMS in dB Mode Application Using Voltage in a Circuit as the Reference Valuedn dB Mode saa iea a ci eene Brequeney Measurements sins sers mem a tuni E mE Negative Edge Triggering eee nee neue ane se Positive and Negative Duty Factor AC vs DC Coupled Frequency Measurements Changing Voltage Range in Frequency Mode Resistance Measurements Ohms Continuity Diode and 50Q Range Application Measuring Low Resistance Values Capacitance Measuretiletit sass cae a par Hay E DAA EE Temperature Measurements TX3 only Helpful Tip Increased Temperature Accuracy GurrentMeasuremefitsi aco a ova oni ii a XC ay Bd 11 12 12 12 13 13 14 14 15 16 16 18 Table of Contents Button and Softkey Overview ae 19 earn vere m Wir 19 General Safety Summary RANGE BUNON mers wee dans dante ete d saver a 19 M M A Minimum Maximum and Average Button 19 Review the follo
35. splay Volts AC DC total RMS dB and dBm Hz Frequency measurements Duty factor also shows if it is turned on in the Setup menu Q Access to resistance and continuity measurements and diode test Capacitance measurements C Temperature measurements in degrees Celsius or Fahrenheit A Amps AC RMS Amps DC Amps AC DC total RMS Amps AC DC dual display and Amps DC 4 20 mA process control loop measurement 1 and TX3 True RMS Digital Multimeters Front and Rear Panel Overview Input Connectors Ke Gi ES ZA A renew gt 1 and TX3 True RMS Digital Multimeters Input connector for current measurements to 5 10 for three minutes or 15 A for 30 seconds Rating is 600 V open circuit voltage COM Common connector All measurements are referenced to this connector V Input connector for volts frequency ohms continuity diode capacitance and temperature measurements Rating is 1000V CAT III for all V input connector measurements WARNING To avoid personal injury do not attach meter leads with the battery cover removed CAUTION To avoid damaging the meter do not attempt to measure current with the batteries removed Operating Basics Before you take any of the measurements described in this section follow these steps For specified accuracy allow the meter to stabilize for 30 seconds after you turn on the meter
36. t and restart the M M A recording While in M M A mode activate memory mode to hold the displayed M M A value for storage into memory without stopping or resetting the M M A recording To exit M M A mode and clear stored values press and hold the M M A button for two seconds Auto Fuse Detection The meter automatically verifies the integrity of the internal fuse when you set the measurement function knob to A If an open fuse is detected the word FUSE shows on the main display See page 48 for instructions on how to replace fuse TX1 and TX3 True RMS Digital Multimeters 2 Specifications 30 All specifications are warranted unless noted as typical for the rated temperature range of 23 C 5 C at less than 80 relative humidity Characteristics Description LCD display digits 3 default or 4 Display counts 5 000 default or 50 000 Bargraph 20 segment updated 20 times per second Memory locations TX1 10 TX3 30 Out of range indicator OL overrange Ur underrange Low voltage indicator Battery symbol shows on LCD at 2 0 V Meter powers down at 1 5 V Battery life 100 hours continuous use with backlight off typical Auto off Adjustable 30 minute default Power source Two AA 1 5 V alkaline batteries NEDA 15A Maximum input voltage between 1000 Vays Installation Category III terminals and between terminals CAT III and earth Ma
37. than the default value of 1 000 Vrms The reference value returns to 1 000 V when you exit dB mode TXI and TX3 Trne RMS Dioital Multimeters 11 Operating Basics Operating Basics Hz S Frequency Measurements AC vs DC Coupled Frequency Measurements When the duty factor measurement mode is off the frequency measurement is AC coupled otherwise it is DC coupled Main Connect leads display Measurement display Changing Voltage Range in Frequency Mode Frequency no selection To change voltage range press the RANGE button The voltage range shows momentarily in the upper display Continue pressing the RANGE button to cycle through the available voltage ranges until the range you want shows The default voltage range is 5 V Frequency and duty factor dual display Displayed when you set negative edge triggering in the Setup menu EdGE is active but not displayed when duty is on You must turn on positive or negative duty in Setup menu Negative Edge Triggering To trigger on the negative edge of the waveform set EdGE to nEG in the Setup menu The word EdGE shows in the upper display when you exit the Setup menu Positive and Negative Duty Factor To measure duty factor set duty POL in the Setup menu to either POS or nEG When you measure negative duty factor a symbol shows in the upper display Positive duty factor b duty a b x 100 Negative duty
38. uces the recording rate to 1 measure ment per second 1 sec M M A The M M A button cycles through the operations listed in the following table Table 3 MIN MAX AVG operations eS Display indicator Description The live signal value is shown The upper display shows the elapsed time since the recording began MAX The MAX indicator and maximum value are shown The upper display shows the timestamp at which the maximum value occurred relative to the start of the test MIN The MIN indicator and minimum value are shown The upper display shows the timestamp at which the minimum value occurred relative to the start of the test MAX MIN The MAX MIN indicator and maximum value minus minimum value are shown The upper display shows the time difference between the MAX and MIN events AVG The AVG indicator is shown and the value shown is the average value of all meter readings The upper display shows the elapsed time since recording began 28 1 and TX3 True RMS Digital Multimeters Special Features Once you set the meter to M M A mode the meter will uprange or automatically increase range setting but will not downrange You must exit M M A mode to restore downranging abilities to the meter While in M M A mode press the HOLD button to stop the recording and freeze the most recent M M A values Press the M M A button to cycle through the held values Press the HOLD button a second time to rese
39. uct or other property si EN Terms on the Product These terms may appear on the product CAUTION indicates a hazard to property including the product Symbols on the Product These symbols may appear on the product AN 5 WARNING CAUTION Double Risk of Refer to Manual Insulated A com v Electric Shock A 2 10 FUSED 600V ad SY 1 Extra large LCD display with dual numerical readout 2 Measurement function knob Use to select a measurement 3 Blue Button Use to access 1ms MEM and Setup menu 4 RANGE Button Use to set measurement range 5 M M A Button Use to set meter to MIN MAX AVG or 1ms modes 6 Softkeys Use with measurement function knob to select measurements 7 Backlight Button Use to turn backlight on and off 8 HOLD Button Use to freeze display 9 A Button Use to make relative measurements and access the memory 10 Input connectors TX 1 and Trne RMS Ninital Multimararc 4 Front and Rear Panel Overview poe E PRESS amp HOLD OPTIONS A Press amp Hold for 2 seconds RANGE Auto RANGE lt 1 HOLD Auto HOLD Setup Manu power up Press amp Hold While Tuming On Meter RANGE 500mV High Impedance 1 soc MMA HOLD Disable Auto Off lt Turn Beeper OFF 2 50 000 Counts Timeout caution amp
40. unts 50 kQ 100 10 500kQ 1000 100 5MO 1kQ 1000 0 4 4 counts 50MQ 10kQ 1 0 4 counts Temperature coefficient 50 Q to 500 KQ Add 0 03 0 1 ct C beyond rated temperature range 5 MQ to 50 MQ Add 0 2 0 1 ct C beyond rated temperature range 1 5 000 count mode only Accuracy in 50 000 count mode is 40 counts eo Accuracy in 50 000 count mode is 20 counts 36 TXI and TX3 True RMS Digital Multimeters Specifications Table 14 Continuity characteristics t M i M E Characteristics Description Continuity threshold Beeper sounds when resistance is 100 or less typical Response time 1ms Table 15 Diode test characteristics Characteristics Description Test current typical 0 35 mA Test voltage 2 8 V maximum open circuit Accuracy E 0 Table 16 Capacitance range resolution and accuracy 5 000 counts only Accuracy Range Resolution 1 TX3 5 nF 1 pF 1 0 5 counts using A mode 50 nF 10 pF 1 0 3 counts using A mode 500 nF 100 pF 1 0 3 counts 5 uF 1nF 50 uF 10 nF 3 0 3 counts 500 uF 100 nF 5 mF 1 pF 50 mF 10 uF Temperature Add 0 05 0 1 ct C beyond rated temperature range coefficient 1 5 000 count mode only gt 1 of range and TX3 True RMS Digital Multimeters 37 Specifications Table 1
41. wer up functions press and hold a button or softkey when you turn on the meter Hold the button or softkey until you hear a single beep and see a text acknowledgment on the display see Table 2 below The following table lists all power up options Most of the power up option descriptions also appear on the rear panel When you turn off the meter the power up options are not saved Use the Setup menu to change default settings Table 2 Power up options Button Power up function Explanation RANGE Sets meter to 500 mV Enables high impedance gt 10 MQ across the HIQ mV high impedance mode input jacks in the 500 mV DC range so that the device under test is not loaded when you measure small voltages Sets meter to 1 second See MAX MIN AVG Operation on page 28 for 1 SEC M M A mode More information A Turns off beeper Double triple and continuity beeps are not affected BLUE Sets meter to high resolu See High Resolution HrES 50 000 Count HrES lion 50 000 count mode Mode on page 25 for further information LIGHT Disables light timeout LOFP Softkey 1 Displays software version Displays the software version M mm where M and calibration date is the major revision and mm is the minor revision Press softkey 1 again to display the date the meter was last calibrated upper display shows month and main display shows year 2 4 26 TXI TX3 Tru
42. wing safety precautions to avoid injury and prevent Ims 1 ms Peak Hold 20 damage to this product or any products connected to it To avoid Backlight Button 20 potential hazards use this product only as specified HOLD Button 20 dice eu e mess vmi Yr indc Fanos maet ien seen 21 Only qualified personnel should perform service procedures A Button Making Relative A DELTA Measurements 21 MEM Memory ass amc tin saan enean 22 To Avoid Fire or Personal Injury ones acti as atit 23 uu 23 Connect and Disconnect Properly Do not connect or disconnect probes ABs Noe pane t xt Si Scu dnm v s sore NUS or test leads while they are connected to a voltage source i TEIE E ENEE EE 25 343 HrES 50 000 Count Mode 25 Observe All Terminal Ratings To avoid fire or shock hazard observe all Bee HAEC QUT TE el hae or 25 ratings and markings on the product Consult the product manual for i i 4 j f f j i f f f 25 further ratings information before making connections to the product Rower Up ORS erna ids wane share N ana 26 Do not apply a potential to any terminal including the common MAX MIN AVG Operation 28 terminal that exceeds the maximum rating of that terminal AutoFuse Detection aan ss sors wan dure zx 29 Replace Batteries Prop
43. ximum open circuit voltage 600 Vrms CAT III when utilizing the A terminal Overload protection V terminal 1000 Vrms 1500 Vj for all functions F1 fuse protection 15 A 1000 V service replaceable Backlight Green LEDs 1 If meter is exposed to water have it inspected by qualified service personnel TXI and TX3 True RMS Digital Multimeters Specifications Table 4 DC voltage characteristics e Characteristic Settling time Description 3 readings typical Reading rate 5 000 ct 4 readings per second 50 000 ct 1 reading per second Rejection ratio Common mode 120 dB at DC or 50 Hz or 60 Hz Normal mode 60 dB at 50 Hz or 60 Hz Input impedance 10 MQ typical Table 5 DC voltage range resolution and accuracy Resolution Accuracy 5 000 counts 50 000 counts 0 07 1 count 0 05 1 count Temperature coefficient Add 0 005 0 1 ct C to accuracy beyond rated temperature range Accuracy in 50 000 count mode is 10 counts and TX3 True RMS Digital Multimeters 31 Specifications Table 6 AC voltage characteristics SSS Characteristic Input impedance Description 10 MQ in parallel with 100 pF typical Settling time 4 readings typical Reading rate 5 000 ct 4 readings per second 50 000 ct 1 read
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