Tektronix TekMeter THM 550 Instructions Manual

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THM 550, THM 560 & THM 565

TekMeter

Instructions

070-8840-02

This document applies for firmware version 2.00

and above.

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Page 1 THM 550, THM 560 & THM 565 TekMeter Instructions 070-8840-02 This document applies for firmware version 2.00 and above.
Page 2 Copyright Tektronix, Inc. 1993. All rights reserved. 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.
Page 3 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.
Page 4 Purchase Repair Protection or Calibration Services, or both, to meet your needs. You can have confidence that your TekMeter investment is protected. To order Service Assurance, please contact your Tektronix representative with the information below. Service Assurance may not be available in some locations outside the United States of America.
Page 5 Table of Contents General Safety Summary ......Overview ......... . Getting Started .
Page 6 Table of Contents Scope Menus ........Scope Menu Tree .
Page 7 General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. Only qualified personnel should perform service procedures. Injury Precautions Avoid Electric Overload To avoid electric shock or fire hazard, do not apply a voltage to a terminal that is outside the range specified for that terminal.
Page 8 General Safety Summary Do Not Operate in Explosive Atmosphere To avoid injury or fire hazard, do not operate this product in an explosive atmosphere. Product Damage Precautions Use Proper Power Source Do not operate this product from a power source that applies more than the voltage specified.
Page 9 General Safety Summary Terms on the Product These terms may appear on the product: DANGER indicates an injury hazard immediately accessible as you read the marking. WARNING indicates an injury hazard not immediately accessible as you read the marking. CAUTION indicates a hazard to property including the product. Symbols on the Product The following symbols may appear on the product: Double...
Page 10 Overview The THM 550, THM 560, and THM 565 TekMeters provide you with the features of a complete digital multimeter (DMM), and in addition, give you the power of a scope, all in a small portable package that is intuitive and simple to use. The DMM provides true RMS AC and DC voltage readouts, resistance readouts, continuity testing with an audible signal, and a diode test mode.
Page 11 Getting Started Installing Batteries The low battery indicator appears in the upper right of the display when the battery voltage gets low. With alkaline batteries, you have about a half hour of battery life. With NiCd batteries, you have only about 30 seconds left.
Page 12 Getting Started Adjust Offset Before performing any measurements using the Scope mode, adjust the offset setting. This is especially important if the THM 500 series instruments has been left without a power source for several hours. NOTE. Pressing the ON/OFF button without batteries installed instantly uncalibrates the offset settings.
Page 13 DMM Operations Meter Bar shows the measured Readout shows the Min/Max Readouts show the Press SELECT to value in a visual measured value extent of variation of the restart monitoring form. numerically. signal over time. the signal variation. Press MENU ON/OFF to display and operate the DMM menus.
Page 14 DMM Operations AC / DC Volts Measurement Load Connect voltage probes to the COM and DMM connectors. Press if in Press to toggle between Read results. Adjust range only if scope mode. AC or DC measurements. needed. Press both to set to Autorange mode.
Page 15 DMM Operations Current Measurement Load Connect current probe to DMM and COM connectors. Adjust range only Set switch on Use the menu to specify that you The readouts if needed. Press current probe. have a current probe and match change to show both to set to the scale factor of the current Amperes.
Page 16 DMM Operations Max/Min Values Variation Window The measurement window always displays the instantaneous value. The variation window displays the maximum and minimum values and the difference between the max and min measurements. The MAX value displays the maximum value measured. This value only changes with a higher measurement value.
Page 17 DMM Operations Ohms and Continuity Connect Press if in Press once or twice to Press Select to turn continuity beeper probes across scope show desired display. on or off. resistor or mode. circuit. Diode Test Press if in Press to display Check forward voltage Check reverse voltage scope...
Page 18 DMM Operations Hold Values Press the Hold button to freeze the Hold shows reading at last hold. display. Press the Hold button again to Hold shows the difference from last held value restart the display. and the present measured value. THM 550, THM 560, and THM 565 TekMeter Instructions...
Page 19 DMM Operations DMM Menus Display menus. Use direction buttons to navigate through Press SELECT if the the menus. message “PRESS SELECT TO CHOOSE” is displayed. If “PRESS SELECT TO CHOOSE” appears, the SELECT button must be pushed to make the selection. If the message does not appear, THM 500 series instruments automatically changes to the chosen selection.
Page 20 DMM Operations DMM Menu Tree The following menu tree provides a quick look at the available DMM menus, helping you to locate specific menu choices. Each DMM menu is described in the following pages. LIGHT UTILITY CONTRAST ADJUST GRATICULE NONE PRINT CROSSHAIR GRID...
Page 21 DMM Operations DMM Main Menus LIGHT PRINT RESET ALL PROBES FILTER STO/REC UTILITY LIGHT turns on the display backlight (THM 565 only). PRINT sends the current DMM display to a connected printer. The printer must use Epson-style commands and be connected through the optional THMCOM1 Communications Adapter.
Page 22 DMM Operations Probes LIGHT PRINT RESET ALL NORMAL PROBES FILTER 1mV=1A 10mV=1A STO/REC UTILITY 100mV=1A 1V=1A The Probes menu lets you specify whether a voltage (normal) or current probe is used. If using a current probe, specify the scale factor. Filter LIGHT PRINT...
Page 23 DMM Operations DMM Sto/Rec Menu LIGHT PRINT RESET ALL PROBES FILTER STO/REC STO SCREEN SCRN1 ( ) UTILITY REC SCREEN PRNT SCRN SCRN8 ( ) STO SETUP CLEAR ALL REC SETUP SCRN1 ( ) SCRN8 ( ) CLEAR ALL SCRN1 ( ) SCRN8 ( ) SET1 ( ) SET8 ( )
Page 24 Scope Operations Run/Hold and The SELECT button selects acquisition among the items displayed in the mode display. upper right corner of the display. Press the MENU ON/OFF button to display and operate the scope menus. The HOLD ON/OFF. Display Controls set button stops the scope display and restarts...
Page 25 Scope Operations Using Channel 1 Connect COM and Press if in Select CH1. (If the Select label is Press if not Press both CH1 probes across not displayed, press the already on. buttons signal source. mode. POSITION/SCALE button.) together to autorange.
Page 26 Scope Operations Positioning Waveforms Press to display position label. Adjust vertical position Adjust horizontal position of display. of display (horizontal position of trigger event). See the example below. Trigger Event Trigger Event A horizontal position of 50% means the A horizontal position of 20% means the trigger event is at center screen.
Page 27 Scope Operations Scaling (Sizing) Waveforms Press to display Scale Press to change volts/division scale Press to change label. factor. seconds/division scale factor. Horizontal scale set to 5 per division. Horizontal scale set to 500ns per division. Vertical scale is set to 200mV per division. Vertical scale is set to 100mV per division.
Page 28 Scope Operations Using Cursors Press to display Cursor label Press Select to toggle between cursor 1 and cursor bars. (CUR 1) and cursor 2 (CUR 2). Display and position the Display and position the time cursors. voltage cursors. Voltage cursors displayed. V measures Time cursors displayed.
Page 29 Scope Operations Triggering Press to display Trigger label and trigger bar. Select the channel to use as the trigger source. Adjust the trigger level. Select the trigger slope (rising or falling). Trigger Point Trigger Level Slope This example shows the trigger source set to channel 1 and the trigger event occurring when the rising edge of the signal exceeds 400 mV.
Page 30 Scope Operations Waveform ON/OFF Press to select which display the WAVEFORM ON/OFF button affects. Press to turn waveform displays on or off. CH1 is the channel 1 scope input. CH2 is the channel 2 scope input. M is the math waveform display last chosen (CH1–CH2 or CH1+CH2). R is the last waveform stored in memory.
Page 31 Scope Operations Scope Menus Display menus. Use direction buttons to navigate Press Select if the through the menus. message “PRESS SELECT TO CHOOSE” is displayed. If “PRESS SELECT TO CHOOSE” appears, the SELECT button must be pushed to make the selection. If the message does not appear, THM 500 series instruments automatically changes to the chosen selection.
Page 32 Scope Operations Scope Menu Tree The menu tree below provides a quick look at the available scope menus, helping locate specific menu choices. Each scope menu is described in the following pages. LIGHT TRIGGER MODE AUTO NORMAL PRINT SINGLE SLOPE NEGATIVE RESET ALL POSITIVE...
Page 33 Scope Operations Scope Main Menus LIGHT PRINT RESET ALL OPERATION MEASURE INPUT ACQUIRE TRIGGER STO/REC UTILITY LIGHT turns on the display backlight (THM 565 only). PRINT sends the current scope display to a connected printer. The printer must use Epson-style commands and be connected through the optional THMCOM1 Communications Adapter.
Page 34 Scope Operations Operation Mode LIGHT PRINT RESET ALL MANUAL OPERATION MEASURE AUTORANGE LINE TEST INPUT ACQUIRE MOTOR TEST TRIGGER STO/REC UTILITY Operation Mode selects between instrument operation. MANUAL lets you set parameters directly; this prevents all other parameters from automatically changing. Manual can be set without using the menu by directly setting any parameter.
Page 35 Scope Operations Measure Modes LIGHT PRINT RESET ALL OPERATION MEASURE NONE INPUT TIMING ACQUIRE VOLTS/AMPS TRIGGER THDF STO/REC POWER UTILITY Measure selects from several automated measurement displays. NONE turns measurements off. TIMING measures the period, frequency, and duty cycle (% of time the voltage is high) of the selected channel.
Page 36 Scope Operations Input Modes LIGHT PRINT RESET ALL OPERATION MEASURE INPUT CH1 CPLG ACQUIRE CH1 INVERT TRIGGER CH1 PROBE STO/REC CH2 CPLG UTILITY CH2 INVERT MATH NORMAL 1mV=1A 10mV=1A 100mV=1A 1V=1A CH1 – CH2 CH1 + CH2 Input mode selections let you choose various actions to apply to the input signal.
Page 37 Scope Operations CH1 PROBE lets you specify whether a voltage or current probe is used on channel 1. If using a current probe, the scale factor must be set to match the attached current probe. NORMAL — Voltage input 1 mV = 1 A — Current input with a conversion factor of 1 mV/A.
Page 38 Scope Operations Acquire Modes LIGHT PRINT RESET ALL OPERATION MEASURE INPUT ACQUIRE SAMPLE TRIGGER SPIKE DETECT STO/REC SMOOTH UTILITY DYNAMIC DSP ACQUIRE specifies how sampling is performed and how the waveform is displayed. SAMPLE (the default) takes one sample for each displayed waveform dot.
Page 39 Scope Operations Time/Div Frequency 200 nS 2.87 MHz 500 nS 1.18 MHz 531 kHz 256 kHz 126 kHz 10 S 62.5 kHz 20 S – 60 S 31.5 kHz DYNAMIC DSP (Dynamic Display) acquires multiple wave- forms per screen update. It is ideal for capturing fast changing and infrequent events.
Page 40 Scope Operations Trigger Menus LIGHT PRINT RESET ALL OPERATION MEASURE INPUT ACQUIRE TRIGGER MODE AUTO STO/REC SLOPE NORMAL UTILITY MOTOR SINGLE NEGATIVE POSITIVE Trigger specifies the parameters needed to trigger the waveform display (cause a sweep). MODE sets the operation of the oscilloscope trigger. AUTO automatically updates the waveform even if a trigger event is not detected.
Page 41 Scope Operations Normal Trigger Level Hysterisis Motor Trigger Level In Normal trigger mode with positive edge selected, the scope triggers on the rising edge of the waveform. However; pulse width modulated waveforms are a series of alternating positive and negative going pulses. With normal triggering, the scope cannot determine which positive pulse to trigger on, resulting in an unstable display.
Page 42 Scope Operations Scope Sto/Rec Menu LIGHT PRINT RESET ALL OPERATION MEASURE INPUT ACQUIRE TRIGGER STO/REC STO SCREEN SCRN1 ( ) REC SCREEN UTILITY PRNT SCRN SCRN8 ( ) STO SETUP CLEAR ALL REC SETUP STO WAVE SCRN1 ( ) REC WAVE SCRN8 ( ) CLEAR ALL SCRN1 ( )
Page 43 Scope Operations Utility Menus LIGHT PRINT RESET ALL OPERATION MEASURE INPUT ACQUIRE TRIGGER STO/REC UTILITY CONTRAST ADJUST GRATICULE TIME OUTS NONE STATUS CROSSHAIR ADJ OFFSET GRID BAUD DIAGNOSTIC POWER OFF TURN ON BACK LIGHT DATE/TIME VIEW PRINT CH1 OFFSET CH2 OFFSET 1200 9600 INTERNAL...
Page 44 Scope Operations STATUS displays the instrument type and firmware. If a printer is not connected when PRINT is selected, press MENU ON/OFF to cancel. ADJ OFFSET removes any offset from the specified scope channel. This has no effect on the DMM input. You will be asked to disconnect the probe from the specified channel and press the Select button to complete the automatic adjustment.
Page 45 Scope Applications Detecting Line Disturbances Connect COM and CH1 across the line voltage. Display menu. Use direction buttons to show Line Test. Select. Select the Specify line test parameters from the dialog screen. Change the Select. parameter parameter. to change. THM 550, THM 560, and THM 565 TekMeter Instructions...
Page 46 Scope Applications Set VOLTAGE QUALITY to define a “Quality Window” for the system under test. Voltage Guaranteed Guaranteed Quality to Pass Nominal to Fail HIGH < 6% > 12% < 13% > 19% FAIR < 20% > 26% < 27% >...
Page 47 Scope Applications Displaying PWM Motor Drive Waveforms (THM 565) Motor Drive Motor Stator Connect voltage probe across the desired phase. WARNING. To prevent injury or loss of life, do not make high voltage measurements without the use of safety gloves. Display menu.
Page 48 Scope Applications Three Phase Voltage (THM 560 and THM 565) Delta ( ) Configuration Connect CH1 across one phase and CH2 across second phase. Select CH1 to show Push to Select CH2 to show Push to first phase. turn on. second phase.
Page 49 Scope Applications Select M to display the math waveform. Push to Press to turn waveform turn on. displays on or off. The math waveform (CH1 – CH2) provides the P2 – P3 phase. Notice that the waveforms are displayed 60 CH 2 from one another.
Page 50 Scope Applications Three Phase Voltage (THM 560 and THM 565) Wye (Y) Configuration Connect CH1 across one phase and CH2 across second phase. Select CH1 to show Push to Select CH2 to show Push to first phase. turn on. second phase. turn on.
Page 51 Scope Applications Select CH2 to store the Store the channel 2 waveform in a waveform memory channel 2 waveform to memory. location. Disconnect CH2 from the second phase and connect across third phase. Channel 1 displays the S1 phase. Channel 2 displays the S3 phase. The Reference waveform “R”...
Page 52 Scope Applications Transformer Harmonic Derating Factor (THDF) Connect current probe to CH1. Use menu to select Set current probe scale. Read results on display. THDF measurement. Transformer Harmonic Derating Factor (THDF) is calculated as follows: RMS Current THDF Peak Current THDF measurements should be performed on each phase of a transformer.
Page 53 Scope Applications Measuring True Power (THM 560 and THM 565) Load Connect current probe to CH1, voltage probe to CH2, and a probe to COM. Use menu to select power Set current probe Read results measurement. Press the scale. on the display. Select button.
Page 54 Appendix A: Specifications To meet specifications, the instrument must have been operating continuously for five minutes within the operating temperature range specified. Specifications are warranted unless noted “typical.” Table 1: DMM Specifications 550 560 565 General Resolution digit, –4,000 count full scale reading except as noted Input Impedance, 10 M typical DC or AC Volts...
Page 55 Appendix A: Specifications Table 1: DMM Specifications (Cont.) AC Voltage Range and Resolution All measurements are true RMS. Range Resolution 400.0 mV 0.1 mV 4.000 V 1 mV 40.00 V 10 mV 400.0 V 100 mV 600 V Autorange available; selects from all ranges except 400.0 mV.
Page 56 Appendix A: Specifications Table 2: Scope Specifications 550 560 565 Modes Autorange (Default) Autorange mode positions and sets the vertical and horizontal scales to between 30% and 60% of full screen (typical). After 500 ms, the process repeats if signal amplitude or period changes. Lower limits of Autorange are 50 mV/div and 100 ms/div.
Page 57 Appendix A: Specifications Table 2: Scope Specifications (Cont.) Vertical Maximum Input Voltage 600 V . See Surge Protection under Safety. Accuracy (3.5% + 2 pixels), 19 C to 27 C; (Vertical DC derate by 0.25% per C outside that range. Delta Voltage Derate additional 0.5% at 5 mV/div.
Page 58 Appendix A: Specifications Table 2: Scope Specifications (Cont.) Measurements Power Calculates true RMS current, voltage, true power, and power factor from CH1 current (using current probe) and CH2 voltage. THDF Calculated as [(RMS Current 1.41414) Peak (Transformer Harmonic Current], as read from a current probe on CH1. Derating Factor) Trigger Source...
Page 59 Appendix A: Specifications Table 3: General Specifications 550 560 565 Real Time Clock Provides date and time stamp capability for line test events and saved waveforms. Display System Display Type Super Twisted Liquid Crystal Display (LCD) Size Width 120 mm (4.72 in) nominal, Height 60 mm (2.36 in) nominal Display Resolution 256 pixels horizontal 128 pixels vertical...
Page 60 Appendix A: Specifications Table 3: General Specifications (Cont.) Environmental Temperature +0 C to +50 C Operating. –20 C to +70 C Storage. Humidity, Operating +0 C to +40 C, up to 90% RH non-condensing (60% for 4 M and 40 M measurements), +41 C to +50 C, 60% RH non-condensing.
Page 61 Appendix A: Specifications Table 3: General Specifications (Cont.) Safety Certifications Listed UL 1244 for 600V measurements; CSA–C22.2 No 231 Series-M89 Surge Protection Withstands incidental line surges up to 6 kV, minimum rise time of 1.2 s, maximum 50 s duration, minimum of 2 minutes between pulses. Maximum volt-hertz product is 50 V MHz.
Page 62 Appendix B: Optional Accessories Several accessories are available for the THM 550, THM 560, and THM 565 TekMeters. Table 4: Optional Accessories TXMDXPB Deluxe Probe Set The deluxe probe set provides more configurations in a wider environmental range than the standard probes that are shipped with the THM 500 series instruments.
Page 63 A605, A621, and A622 Current Probes Three Tektronix current probes extend the THM 500 series instruments to handle current and power measurements. These clamp-on probes do not require disconnections to insert the meter into the circuit.
Page 64 In rare cases, your THM 500 series instrument may require servicing. There are no user serviceable parts inside the THM 500 series instruments. For service, return the instrument to the Tektronix office in your location. THM 550, THM 560, and THM 565 TekMeter Instructions...
Page 65 Appendix C: Troubleshooting Reducing Noise Pickup Picking up line signal noise is a typical problem when using sensitive measurement devices such as THM 500 Series instruments. Here are some helpful hints to limit the amount of noise picked up by the THM 500 Series instrument: Keep the transformer line cord away from the measurement leads.
Page 66 Obtain replacement parts for THM 500 series instruments by contacting your distributor, the place of purchase, or your nearest Tektronix office. The replaceable parts that are available are listed below. There are no user-replaceable parts inside the THM 500 series instruments.
Page 67 EC Declaration of Conformity Tektronix Holland N.V. Marktweg 73A 8444 AB Heerenveen The Netherlands declare under sole responsibility that the THM 550, THM 560, and THM 565 instruments meet the intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance was demonstrated to the following...

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