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Tektronix 501A User's Manual

1. LIRFTILEATIH ERLITT PEL AUG 1980 DM 501A PAE LOIRET RBA KE 1 a Jj c Nur TEN Li He Tir T Fais iin ELO S6 HY d Aft Bat 8 ren MD A o TIO DAME HNL Ti da bus LT AO PKR x6 A co sc TR Hiji DM 501A lia kos 57 KIN A250 Vrms Li osi oou CT Lx Te be tos xiii DM 5014 Perro DM 501A Digital Multimeter xiv AUG 1980 Section 1 DM 501A SPECIFICATION introduction The DM 501A Digital Multimeter measures dc voltage and current ac voltage and current dBm dBV resistance and temperature The ac functions are ac coupled only true rms respondin
2. 19999 000V DC 500VAC ER LN 4 VOLTS LOW DC AC dBV dBm A C DC mA LOW AC DC INPUT EXT INT 28A LO 28B HD dB TEMP 3 200V 28A 28B LOW
3. mA AC DC HE LO VoLTS A dB AC AC DC Japanese 2 2 DM501A e 10 100
4. DM 501A 15cm 15kg cm Japanese 2 5 Section 3 DM 501A THEORY OF OPERATION introduction This section of the manual describes the circuits necessary to display in digital form the value of an input voltage current resistance or temperature Refer to the block diagram andthe schematic diagrams indicated by a diamond in the diagram section for an overall view of the DM 501A operation including typical input and output signal levels Voltage Input Circuits The internal external INT EXT front panel switch S4 A and S4 B
5. e MH ach IN ATTENTION e a Tr aM xii TRE WOO DM 501A X BA Van DIREI Ro TAREA WMS a ZERIT SCA A7 7 TEN LEER 2 DE Sv 2 AUG 1980 dl TM5OO en cee E E Jo t ZX 2 ORE Yo M
6. 40dB 500V AC 16 2dBm 14dB V Japanese 2 4 M501A 0dB 116009 1 mW 0 7746V IiV 0dB Tit VBR Fay ACHERN IMA RS o EM LEY EU GET AC mA LOW AC k LO vokSU ET XE2 1 HIHz LOR RIL Z4 KOM SUM RMOSRBS LES THC RALEN LO kQ LOW VOLTS VOLT
7. DM501A 2 1 DM501A DM501A LED DM501A T32749 2 2 18 REV A AUG 1980 Japanese 2 1 DM 501A 2 280 DIFHOLEDETA GEL AS Li kgm 5cg dsueBLET dB A Y FOV LOW ONTE dB INPUT N
8. Section 2 DM 501A OPERATING INSTRUCTIONS installation and Removal Instructions The DM 501A is calibrated and ready to use when received it operates in one compartment of a TM 500 Series power module Refer to the power module instruc tion manual for line voltage requirements and power module operation CAUTION Turn the power module off before inserting or removing the DM 501A otherwise arcing may occur at the rear interface connectors Arcing reduces the connectors usetul life and damage may be done to the plug in circuitry BARRIER Check to see that the plastic barriers on the inter connecting jack of the selected power module compart ment match the cut outs in the DM 501A circuit board edge connector If they don t match do not insert the piug in until proper identification is made When the units are properly matched align the DM 501A chassis with the upper and lower guides see Fig 2 1 of the selected compartment insert the DM 501A into the compartment and press firmly to seat the circuit board in the inter connecting jack The LED display should be visible when the power module power switch is turned on To remove the DM 501A pull the release latch located on the lower left corner until the interconnecting jack disengages The DM 501A will now slide out TOP GROOVE GROOVE 2749 2 Fig 2 1 installation and removal REV A AUG 1980 English 2 1 Operating Instructions DM 501
9. LOW DM501A BN Le L 3 LOW REV A AUG 1980 DM 501A 2 2 e Japanese 2 3 DM SOTA DM50IA 1 42 5V Z 2 B A STR LEE RIDE d S BRI UE RER 2 DM501A DM501 A DC VOLTS DC MEL LOW VOLTS 2 FRY LOWAH 2 7 FILIEXTVOLTS Q 447 Fic Mb gt MEAAKSDHUSILILY FT h RRS a LOW VOLTS A DC mA D
10. 2 seconds 10 MQ 10 5 paralleled by 160 pF Front panel EXT or rear interface INT 500 V rms or 500 Vdc not to exceed 1000 V peak 1000 V peak 1000 V peak 4 at ful scale Typicalty lt 2 5 dB 10 kHz to 20 kHz Typically lt 3 1 dB 10 kHz to 20 kHz 0 1 dB 2 seconds 10 MO paralleled by 160 pF 500 v rms or 600 Vdc not to exceed 1000 V peak 1000 V peak 1000 V peak 1 3 Specification DM 501A Table 1 1 cont Characteristics Performance Requirements Suppiemental information Crest Factor 4 at fuli scale Ref Voitage dBV t V dBm 0 7746 V 1 mW dissipated into 600 9 Selected by internal jumper Front panel EXT or rear interface input Connectors OHMMETER Accuracy for 200 Q 2 kQ 20 kQ pot TRUE 200 kQ 2000 kQ and 20 MQ ranges 18 C to 28 C i 200 Q to 200 kN LOQ 0 15 of reading 0 015 of full 2 k to 2000 kQ HIN Scale 2000 kN LO 0 3 of reading 0 015 of full scale 20 MQ HN 0 5 of reading 0 015 of full scale 0 C to 18 C 28 C to 50 C 200 Q to 200 kQ LO Q 0 3 of reading 0 025 of full 2 kM to 2000 kM HIN scale 2000 kQ LO Q 1 1 2 of reading 0 025 of fuil 20 MQ HI Q scale Maximum input Volts Any Range 250 V peak Measuring Current and Full Source V Max at Scate Volts Range Current Full Scale a il HI OQ 200 Q 1 0 mA 0 2 V 2 KQ 1 0 mA 2 0 V 20 kO 0 1 mA 2
11. g Adjust R1528 dB Gain for a flashing display positive reading with the upper segment of the 1 in the most significant digit followed by the numerals 0 0 h Set the ac calibrator for 7 746 mV dBm or 10 00 mV dBV i Check for a flashing display negative reading with the upper segment of the 1 in the most significant digit followed by the numerals 0 0 j The settings of R1535 dB and R1528 dB Gain may need to be compromised for optimum operation within the limits specified Refer to Tables 4 4 or 4 5 k Remove the ac calibrator connections from the DM 5014 6 Adjust HI Ohms and LO Ohms a Press the kQ function push button b Press the 20 kQ range push button C Set all other push buttons to the out position REV A MAR 1981 d Set the resistance standard for 19 000 kf e Connect the resistance standard between the VOLTS Q and LOW input connectors f With the HI LO push button in the out position adjust R1426 HIN for a display reading of 18 994 to 19 006 g Press the HI LO push button h Adjust R1412 LO N for a display reading of 18 994 to 19 006 i Remove the resistance standard connections from the DM 5014 7 Adjust TEMP 9 and TEMP Set a Remove left side shield Calibration Procedure DM SOTA Adjustment Procedure b Connect the temperature probe to the front panel TEMP connector c Press the TEMP C function push button d Place the temperature probe in a 0 0 C ic
12. 0 8 of reading 0 075 of full scale 1 3 of reading 0 075 of full scale 0 8 of reading 0 3 of full scale 1 3 of reading 0 3 of full scale Supplemental information With a 1 kO unbalance 10 pV lt 1 second 10 MQ 20 5 1000 V peak 1000 V peak 1000 V peak Front panel EXT or rear interface INT Input signal must be between 5 and 100 of fuli scale The 500 V range requires a dynamic input signal between 500 V and 100 V rms Table 1 1 cont Characteristics Performance Requirements AC VOLTMETER TRUE RMS cont Common Mode Rejection Ratio gt 60 dB at 50 and 60 Hz Maximum Resolution Response Time input Impedance Input Connectors Maximum Input Voltage VOLTS Q to LOW VOLTS Q to ground LOW to ground Crest Factor H 1 DECIBELS dB TRUE RMS Accuracy for 40 dB 20 dB 0 dB 20 dB and 40 dB ranges 18 C to 28 C 20 dB to 15 dB 0 5 dB 20 Hz to 20 kHz 15 dB to 20 dB 10 5 dB 20 Hz to 2 kHz 1 5 dB 2 kHz to 10 kHz 0 C to 18 C 28 C to 50 C 20 dB to 15 dB 1 1 dB 20 Hz to 20 kHz 15 dB to 20 dB 1 1 dB 20 Hz to 2 kHz 2 1 dB 2 kHz to 10 kHz Maximum Resolution Response Time Input Impedance Maximum input Voltage VOLTS Q to LOW VOLTS A to ground LOW to ground Equivalent to 54 dBV or 56 2 dBm REV B MAY 1980 Specification DM 501A Supplemental Information With a 1kQ unbalance 10 wv
13. Calibration Procedure DM 501A Performance Check Procedure Table 4 13 REAR INTERFACE dBm ACCURACY Calibration Frequency 20 Hz to 20 kHz 20 dB to 15 dB 20 Hz to 10 kHz 15 dB to 20 dB DISPLAY LIMITS Calibration Ambient Temp Range Ambient Temp Range Range Voltage 18 C to 28 C 0 C to 18 C 28 C to 50 C 40 dB 7 746 mV to 6 1 2 to 1 2 40 dB 77 46 mV 19 4 to 20 6 18 8 to 21 2 40 dB 0 7746 mV 19 4 to 20 6 20 Hz to 2 kHz 18 8 to 21 2 20 Hz to 2 kHz 18 4 to 21 6 2 kHz to 10 kHz 17 8 to 22 2 2 kHz to 10 kHz 20 dB 7 746 mV 19 4to 20 6 20 Hz to 2 kHz 18 8 to 21 2 20 Hz to 2 kHz 18 4 to 21 6 2 kHz to 10 kHz 17 8 to 22 2 2 kHz to 10 kHz 20 dB 77 46 mV 20 dB 774 6 mV 6 to 4 6 1 2 to 1 2 19 4 to 20 6 18 8 to 21 2 When a 2 is displayed the DM 501A overranges flashing display and illuminates only the upper segment of the 1 in the most significant digit Tabie 4 14 REAR INTERFACE dBV ACCURACY Calibration Frequency 20 Hz to 20 kHz 20 dB to 15 dB 20 Hz to 10 kHz 15 dB to 20 d8 DISPLAY LIMITS Calibration Ambient Temp Range Ambient Temp Range Range Voltage 18 C to 28 C 0 C to 18 C 28 C to 50 C 40 dB 10 mV 510 78 1 3 to 1 3 40 dB 100 mV 19 4 to 20 6 718 710 21 3 40 dB 1 mV 19 4 to 20 6 20 Hz to 2 kHz 18 8 to 21 2 20 Hz to 2 kHz 18 4 to 21 6 2 k
14. Serviceleistung bei Bewahren Sie die Originalverpackung des Ger tes f r evtl Wiederverwendung auf Steht diese nicht mehr zur Verf gung verfahren Sie bitte wie folgt Das Gerat ist zum Schutz seines AuBeren mit Plastik folie zu umwickeln und in einen Karton aus Wellpappe mit gen gender Festigkeit zu setzen Die Innenma e dieses Kartons sollten ca 15 cm gr er sein als die Ger teabmessungen Polstern Sie das Ger t allseitig mit Styroporflocken oder Schaum Der Karton ist au en mit Verpackungsband zu umwickein Die Festigkeit des Originalkartons betr gt ca 14 kg cm German 2 5 DM 501A Gk DM501A TM500 DM501A
15. Usable to 20 kHz lt 2 seconds Approximate Range Resistance 200 uA 1 0 KQ 1000 Q 102 Q 200 mA 12 Q 2000 mA 04 Q REV A AUG 1979 1 5 Specification DM 501A Characteristics Maximum Input Current Maximum Open Circuit Input Voltage mA to LOW Maximum Floating Voltage mA to ground LOW to ground Imput Connectors Maximum Resolution Accuracy for the 62 C to 240 C range 18 C to 28 C ambient Probe calibrated to instrument Any probe 0 C to 18 C 28 C to 50 C input Connectors 1 6 Table 1 1 cont Performance Requirements Supplemental information AC AMMETER cont TEMPERATURE 2 C from 62 C to 150 C 4 C from 62 C to 150 C 2 C to 8 C from 150 C to 240 C Add 1 5 C to the above tolerance in each direction 9 Cto 8 C from 150 C to 240 C 2 A any range 250 V peak i 1000 V peak i 1000 V peak Front panel oniy 10 nA REV A AUG 1980 Specification DM 501A Table 1 1 cont ELECTRICAL CHARACTERISTICS Rear Interface Inputs Characteristics Performance Requirements Supplemental Information Maximum input Voltage dc ac d8 and ohms Pin 28B to 28A 200 V peak Equivaient to 43 dBV or 45 2 dBm Pin 28B to ground 200 V peak Pin 28A to ground 200 V peak DC VOLTMETER REAR INTERFACE INPUTS Accuracy for 200 mV 2 V 20 V 200 V and 1000 V ranges 18 C to 28 C 200 mV range 0 05 of
16. ngig vom gew hiten Bereich Bereichswahi Drucktasten f r Messungen von Spannung Widerstand Strom und Dezibel Frontseitiger mA Eingang in Verbindung mit dem LOW Eingang f r Strommessungen Eingangsbuchse f r Temperaturtastkopf Chassis MasseanschluB AN Frontseitige Eing nge f r Spannungs Widerstands und Dezibel Messungen Drucktaste zur Aktivierung des Temperaturein gangs O0 0000 INPUT Eingang A Drucktaste zur Wahi der r ckseitigen inter face Eingange oder der frontseitigen Me Eingange 3 gt Drucktaste f r Wechselstrom AC MeBbereich Drucktaste f r Gleichstrom DC Me bereich Drucktaste f r Hl oder LO Betrieb bei Wider standsmessungen 6 Drucktaste f r Widerstandsmessung 5 Drucktaste f r den Dezibelme bereich in Verbindung mit der Drucktaste f r den Wechsel spannungsme bereich AC Volts Drucktaste f r den WechselspannungsmeBbe reich AC Volts Drucktaste f r den Gleichspannungsme bereich DC Volts Entriegelungsklinke zum Entnehmen des Ein schubes e 900 Beziehen Sie sich auf die allgemeine Bedienungsanteitung 2 2 German Allgemeine Bedienungsanleitung Das ist eine Versorgungseinheit eingesetzte DM 501A gestattet nach einer Warmiaufzeit von 30 Minuten Messungen mit der spezifizierten Genauigkeit Hierzu ist die gew nschte MeBfunktion und der Bereich zu wahien ist der Me wert unbekannt mu zun chst der h chste Me
17. trois conducteurs Instructions d utilisation DM 501A Capi e Fig 2 2 Commandes et prises French 2 3 Instructions d utilisation DM 501A ATTENTION Pour liminer au mieux les risques ventuels d lec trocution 1 viter tout contact avec la source de tension si la tension mesur e d passe 42 5 V cr te 2 D connecter les sondes du circuit sous test avant de les d connecter du DM 501A ou avant d extraire le DM 501A de son module d alimentation Mesures de tension continue Appuyer sur le bouton poussoir VOLTS DC et s lection ner la gamme appropri e Appliquer la tension mesurer sur les prises d entr e LOW et VOL T ohm S assurer que la tension d entr e maximale indiqu e sur le panneau avant n est pas d pass e L affichage indiquera un si l en tr e de la prise VOLTS ohm est positive par rapport l entr e LOW et un dans le cas contraire Si les entr es VOLTS OHM et LOW sont r unies entre elles court cir cuit l affichage doit indiquer 0 Mesures de courant continu Appuyer sur le bouton poussoir mA DC et s lectionner la gamme appropri e Faire circuler le courant continu mesurer entre les prises d entr e LOW et mA L affichage indiquera un si le courant entre la borne mA et sort par la borne LOW sens conventionnel du courant Un fusible interne situ sur le circuit imprim protege l entr e du cou rant Seule une personne qualifi e peut proc
18. 30 V 2 Adjust 2 Vdc Y and 200 mVdc Y a Press the VOLTS DC push button b Connect a shorting strap from the LOW connector to the VOLTS Q connector on the front panel of the DM 501A c Press the 2 V range push button switch d Adjust R1405 2 Vdc for a DM 501A display reading of 1 0000 e Press the 200 mV range push button f Adjust R1415 200 mVdc 9 located on the Main board fora DM 501A display reading of 00 01 to 00 01 g Remove the shorting strap between the LOW and VOLTS Q front panel connectors 2A 200 Q Zero Adjust SN B025410 amp Up NOTE The electrical shieid must be removed to make the 200 2 0 adjustment The shield should be installed for all other adjustments a Push DM 501A kQ function button in Push 200 0 range button in Set All other DM 501A buttons out Connect Shorting bar across the DM 501A LOW and VOLTS Q INPUT jacks b Adjust R1614 for a display of 00 00 c Remove Shorting bar from DM 5014 3 Adjust Dc Voltage Ranges a Select the range and required dc calibration voltage in the order listed in Table 4 15 4 11 Calibration Procedure DM 501A Adjustment Procedure NOTE The adjustment of the 2 Vdc range interacts with the setting of the 200 mV range but not vice versa b Adjust the selected control for the required display c Return the calibrator to a minimum voltage d Remove connections 4 Adjust AC Converter and Attenuator Compensati
19. 6 of U1539 feed through R1537 to converter U1429 pin 1 and outputs at pin 8 of U1429 Through appropriate switching U1429 pin 8 output voltage couples to the Analog Converter L1 1601 pin 15 Ac current is also measured as a true rms ac function Ohms Converter Refer to Fig 3 6 The ohms converter circuitry generates a known current that flows out the front panel VOLTS Q connector through the unknown resistance The voltage developed at the input connectors is proportional to the unknown resistance This voltage is sensed by the a d converter and displayed as an ohms value REAR INTERFACE y 28B CONNECTOR VOLTS N RT1102 10k 100 pA 1 mA TO LOW A D CONVERTER UNKNOWN 1 RESISTANCE 45V CR1516 A crisis V 100 A ER CN Q1415 W 12 V The Ohms Reference Current Source Q1415 and associated circuitry generates a 100 4A reference current This current either flows through R1516 or R1516 in parallel with the series combination of R1515 and R1412 LON depending on which ohms function and range is selected This reference current develops either 1 V or 10 V across R1516 The Ohms Converter U1515 and Q1525 applies 1 V or 10 V across the attenuator section selected by the range switches The attenuator current determined by the range switches flows through ohms protection posistor RT1102 and out the VOLTS Q front panel connector or rear interface connector pin 28B through the unknown resistance to the LOW fr
20. C push button Apply the probe sensor tip to the device under test DUT Allow sufficient time for the probe tip to stabilize before taking a reading The time to reach a stable reading is a function of the thermal mass of the probe and DUT the thermal resistance of the probe and DUT and the amount of heat being applied to the DUT Refer to the P6601 manual for more information on temperature measurements and probe use A list of standard accessories and part numbers is located in the Replaceable Mechanical Parts list Repackaging Information if this Tektronix instrument is to be shipped to a Tektronix Service Center for service or repair attach atag showing owner with address and the name of an REV A AUG 1980 Operating Instructions DM 501A individual at your firm that can be contacted include the complete instrument serial number and a description of the service required Save and re use the package in which the instrument was shipped If the original packaging is unfit for use or not available repackage the instrument as follows Surround the instrument with polyethylene sheeting to protect the finish of the instrument Obtain a carton of corrugated cardboard of the correct carton strength and having inside dimensions of no less than 6 inches more than the instrument dimensions Cushion the instrument by tightly packing 3 inches of dunnage or urethane foam between carton and instrument on all sides Seal the cart
21. Check as per part n u Remove the connections to the DM SOTA 3 Check Dc Normal Mode Rejection 60 dB a Connect a bnc female to dual banana connector to the VOLTS Q and LOW connectors b Connect the bnc female connector through a coax ial cable to the ac voltage calibrator c Press the VOLTS DC function push button REV A MAY 1980 Calibration Procedure DM 501A Performance Check Procedure d Press the 200 mV range push button e Set the ac calibrator for 1 V ac rms output at either 50 or 60 Hz 0 2 Hz f Check the display for a reading of 01 41 4 Check Ac Voltage Accuracy a Connect the ac voltage calibrator to the VOLTS Q and LOW connectors through appropriate cables and connectors b Press the VOLTS AC TRUE RMS function push button c Press the range push button and set the calibrator voltage as listed in Table 4 3 d Check that the DM 501A display reads within the display limits for the ambient temperatures and frequen cies as listed in Table 4 3 e Set the ac calibrator to a minimum voltage 5 Check dBm Accuracy Factory Shipped with internal jumper set for dBm readout a Press the VOLTS AC TRUE RMS and dB push buttons b Connect the ac voltage calibrator to the VOLTS Q and LOW connectors through appropriate cables and connectors c Press the range push button and set the calibrator voltage and frequency as listed in Table 4 4 d Check that the DM 501A display r
22. Faire ensuite glisser l appareil MODULE DE PUISSANCE D trompeur Guide sup rieur Guide inf risur TF 1431 21 2749 2 Fig 2 1 Installation et d montage REV A AUG 1980 French 2 1 Instructions d utilisation DM 501A COMMANDES ET PRISES Affichage 4 chiffres 1 2 r alis par diodes lectro luminescentes L emplacement de la virgule est d termin par la gamme s lectionn e Commandes de s lection de gammes pour les mesu res de tenion volts r sistance ohms courant am p res ou niveaux d cibels Prise d entr e mA situ e sur le panneau avant utili s e conjointement avec l entr e LOW pour les mesu res de courant Prise d entr e de la sonde de temp rature Borne de mise la masse du chassis A Entr es situ es sur le panneau avant pour ef fectuer des mesures de tension volts r sistance ohms et niveaux d cibels Bouton de commande de la fonction Mesure de temp rature Q 066686 INPUT entr e A Bouton poussoir s lectionnant soit les entr es au niveau du connecteur arri re soit les entr es si tu es sur le panneau avant Bouton de commande de la fonction Mesure de courant alternatif Bouton de commande de la fonction Mesure de courant continu Bouton poussoir s lectionnant les niveaux haute ten sion Hi ou basse tension LO l embout de la som de pour les mesures de r sistance ohms Bouton de commande de la fon
23. LD120 11601 comparator changes state The count is in single clock times The override period can exist a maximum of 56 clock times into the zero period assuming the non overload Via Since only 14 of the 16 counts in the U D waveform see Fig 3 9 produce net counts there are 128 672 counts maximum out of the measure period of 32 768 clock times available At the end of the measure period after the last count cycle has accumulated its counts the data in the counter is transferred to the data latches The data is then multiplexed to the bcd outputs at the timethe proper digit select line is enabled The digit select lines drive U1701 Digit Select Driver which pulls down on the appropriate display common cathodes During the time when each of the digit select lines on U1603 is enabled the corresponding digit infor mation is available at the bcd output Theory of Operation DM 501A Display Driver Display driver U1805 is a bcd to 7 segment decoder The bcd digit information is decoded by U1805 and applied to the cathodes of 7 segment displays DS1000 DS1001 DS1100 DS1101 and DS1200 The output of U1805 is an active high that pulls up on the appropriate LED anodes Figure 3 10 shows the waveforms available at the digit select lines and also the SIGN output in addition to the sign information the SIGN output aiso has the overrange and underrange information The sign informa tion is the only information used in this
24. Tektronix COMMITTED TO EXCELLENCE PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL DM 501A DIGITAL MULTIMETER Francais Deutsch AA 7 INSTRUCTION MANUAL Tektronix Inc P O Box 500 7101 GE Beaverton Oregon 97077 Serial Number LA E 070 2749 00 First Printing JUN 1979 Product Group 75 Revised APR 1986 Copyright 1974 1980 Tektronix Inc All rights reserved Contents of this publication may not be reproduced in any form without the written permission of Tektronix Inc Products of Tektronix Inc andits subsidiaries are covered by U S and foreign patents and or pending patents TEKTRONIX TEK SCOPE MOBILE and istered trademarks of Tektronix inc i are reg Printed in U S A Specification and price change privileges are reserved Copyright 1974 1980 TEKTRONIX INC Tous droits r serv s Le contenu de ce manuel ne peut tre reproduit sous quelque for me que ce soit sans l accord de Tektronix Inc Tous les produits TEKTRONIX sont brevet s US et Etranger et les logotypes TEKTRONIX TEK SCOPE MOBILE sont d pos s Imprim aux USA TEKTRONI X se r serve le droit de modifier caract ristiques et prix dans le cadre de d veloppements techno logiques Copyright 1974 1980 durch Tektronix Inc Alle Rechte vorbe halten Der Inhalt dieser Publikation darf ohne Genehmigung von Tektronix Inc nicht weitergegeben werden Produkte von Tektronix Inc und seinen Tochtergesells
25. This particular range will give maximum resolu tion When an input signal causes the display to read greater than 19999 an overrange blinking display occurs This blinking indicates the input is greater than the full scale reading on the particular range selected The 1000 Vdc and 500 Vac range will not cause a blinking display when the input signal exceeds the maximum allowabie input on this range Instrument damage may occur if maximum input potential is exceeded Input Connections IN Four input connectors provide front panel measure ment connections The VOLTS Q and LOW input connec tors are used for dc voitage ac voltage dBV dBm and ac and dc resistance measurements The mA and LOW input connectors are used for ac or dc current measurements The input EXT INT push button selects front panel or rear interface input Rear interface pins 28A LO and 28B HI are used for rear interface voltage dB and resistance measurements The TEMP input connector is used for temperature measurements CAUTION To avoid equipment damage do not apply a vo tage exceeding 200 V peak between pins 28A and 28B of the rear interface connector Normal measurement conditions are with the LOW connector referenced to the device under test common connection between the LOW input connector and the ground terminal may be made to referencetheinputtothe DM 501A chassis ground Use caution as the LOW connector is connected to earth ground throu
26. V ranges 18 C to 28 C 200 mV range scale 2 V to 200 V ranges scale 1000 V range scale 0 C to 18 C 28 C to 450 C 200 mV to 200 V range 0 1 of reading 0 025 of full scale 0 05 of reading 0 015 of full X 0 0596 of reading 0 01 of full 0 05 of reading 0 02 of full 1000 V range 0 1 of reading 0 05 of full scale 1 1 Specification DM 501A Characteristics Common Mode Rejection Ratio Normal Mode Rejection Ratio Maximum Resolution Step Response Time Input Resistance Maximum input Voltage VOLTS A to LOW VOLTS O to ground LOW to ground input Connectors Table 1 1 cont Performance Requirements DC VOLTMETER cont 100 dB at dc 80 dB at 50 and 60 Hz 60 dB at 50 or 60 Hz 0 2 Fiz AC VOLTMETER TRUE RMS Accuracy for 200 mV 2V 20V 200 V and 500 V ranges 18 C to 28 C 200 mV to 200 V ranges 40 Hz to 10 KHz 20 Hz to 40 Hz and 10 kHz to 20 kHz 500 V range 40 Hz to 10 kHz 20 Hz to 40 Hz and 10 kHz to 20 kHz 0 C to 18 C 28 C to 50 C 200 mV to 200 V ranges 40 Hz to 10 kHz 20 Hz to 40 Hz and 10 kHz to 20 kHz 500 V range 40 Hz to 10 kHz 20 Hz to 40 Hz and 10 kHz to 20 kHz 1 2 0 6 of reading 0 05 of full scale 1 0 of reading 0 05 of full scale 0 6 of reading 0 2 of full scale 1 0 of reading 0 2 of full scale
27. converter when in the 2 V full scale mode When the a d converter input is set for 200 mV full scale mode relays K1408 and K1505 are energized The 200 mVdc 8 R1415 is now in the circuit to adjust for the initial zero offset The a d converter operates on a charge balancing technique The input voltage is converted to acurrent that charges integrator capacitor C1508 The converter counts the units of charge needed to keep the integrator output near zero See Fig 8 2 in the Diagrams section The conversion cycle is 49 152 clock pulses long of which 16 384 pulses are used in the AUTO Zero AZ interval and 32 768 pulses are used inthe measure interval Auto Zero Period The a d converter system during the Auto Zero period is represented by Fig 3 7 In the A Z period the input bufferis connectedto reference ground andthe A Z buffer input is connected through H1507 totheintegrator output Note the M Z line is low The U D line is being toggled ata 5096 duty cycle which results in a current through R1605 and R1505 at one half of Vir Ri Thedynamics of the a d converter system causes the voltage on capacitor C1505 Cun to attain the value required for the sum of the currents entering the integrator summing mode to be zero The A Z voltage on C1505 is approximately 2 V which is equivalent to the integrator output voltage Measure Interval During the measure interval see Fig 3 8 the input buffer is connected to Vi and suppl
28. courant Seul un personnel comp tent peut proc der un changement de fusible Ne pas utiliser l appareil en atmosph re explosives Pour viter toute explosion ne pas utiliser cet appareil dans une atmosph re de gaz explosifs moins qu une telle utilisation n ait t sp cifiquement reconnue possible Ne pas Gter les capots ou panneaux Pour viter tout incident corporel grave ne pas ter les panneaux ou capots de protection de l appareil Celui ci ne doit pas fonctionner tant que les panneaux et capots n ont pas correctement t mis en place Ne pas faire fonctionner l appareil sans les capots et panneaux pour les tiroirs de la s rie TM 500 uniquement Pour viter tout incident corporel grace ne pas utiliser l appareil alors que les capots ou panneaux ne sont pas remis en place N appliquer aucune tension au tiroir par l interm diaire d un cordon d extension CONSIGNES DE SECURITE UNIQUEMENT DESTINEES AU PERSONNEL DE MAINTENANCE I est indispensable de se r f rer galement aux consignes de s curit l attention des utilisateurs Ne jamais tre seul pour proc der l entretien de l appareil Agir avec pr caution si l on effectue une r paration alors que l appareil est sous tension Des tensions dangereuses existent en divers points de l appareil Pour viter tout risque de blessure corpo relle ne touchez ni aux connexions expos es ni aux composants alors que l appareil est sous tension Couper l alime
29. der la v ri fication de ce fusible Mesures de tension alternative et mesures de ni veaux d cibels Pour effectuer les mesures de tension alternative appuyer sur le bouton poussoir VOLTS AC et s lectionner la gam me appropri e Appliquer la tension inconnue aux prises d entr e LOW et VOLTS OHM Les mesures de tension alternative ou de niveaux dB s effectuent gr ce un convertisseur tension efficace calcul e tension continue Les tensions peuvent tre mesur es avec un facteur de cr te allant jusqu quatre Le facteur de cr te est le rapport de la tension cr te sur la tension efficace Appuyer sur les boutons poussoirs VOLTS AC et dB et s lectionner la gamme appropri e On obtient une dyna mique de 20 dB sur n importe quelle gamme exception faite de la gamme 40 dB Les mesures de niveaux dB s effectuent en additionnant la valeur affich e au nombre de dB indiqu par la gamme s lectionn e Par exemple supposons que la valeur affich e soit 15 6 dB sur une gamme de 20 dB La valeur du signal sera alors de 35 6 dB Sur la gamme de 40 dB la valeur maximale affich e sera limit e 16 2 dBm ou 14 dBV la tension alternative maximale applicable l appareil tant de 500 V 2 4 French A la livraison de l appareil la valeur de r f rence O dB est d un mW dissip dans une r sistance de 600 2 0 7746 V La valeur de r f rence en dB V d un volt est galement disponible par l inter
30. in This Manual CAUTION statements identify conditions or practices that could result in damage to the equipment or other property WARNING statements identify conditions or practices that could result in personal injury or loss of life As Marked on Equipment CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking or a hazard to property including the equipment itself DANGER indicates a personal injury hazard immediately accessible as onereads the marking SYMBOLS In This Manual This symbol indicates where applicable cautionary or other information is to be found As Marked on Equipment DANGER High voltage amp Protective ground earth terminal IN ATTENTION refer to manual Power Source This product is intended to operate from a power source that will not apply more than 250 volts rms between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation REV A AUG 1980 v DM SOTA Grounding the Product This product is grounded through the grounding conductor of the power cord To avoid electrical shock plug the power cord into a properly wired receptacle before connecting tothe product input or output terminals A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Danger Aris
31. mA AC function push button c Press the range push button and set the current source as listed in Table 4 8 d Check that the DM 501A display reads within the display limits for the ambient temperature as listed in Table 4 8 e Remove the AC current source and all connections 9 Check Temperature Accuracy a Connect the temperature probe to the TEMP con nector located on the front panel b Press the TEMP C push button c Set the temperature bath for the first temperatures shown in the Temperature column in Table 4 9 d Insert the probe in the bath and allow the probe to stabilize at the selected temperature e Check that the display limits are aslistedin Table 4 9 t Repeat parts c d and e for the subsequent temperatures listed in Table 4 9 g This completes the front panel performance check Rear Interface Accuracy Checks To verify the accuracy of the dc voltage ac voltage and resistance modes via the DM 501A rear interface follow the steps outlined in the Performance Check Procedure forthe front panel input connectors but apply the voltages and resistances to rear interface pins 28B HI and 28A LO Access to the rear interface pinsis most easily made using a TM 500 series Option 2 power module Press the front panel EXT INT push button to select rear interface input and use Table 4 10 Table 4 11 Table 4 12 Table 4 13 or Table 4 14 for the appropriate input voltages frequencies and disp
32. reading 0 015 of full scale 2 V to 200 V range x 0 0596 of reading 0 01 of full scale 1000 V range 0 05 of reading 0 02 of fuil scale 0 C to 18 C 28 C to 50 C 200 mV to 200 V range 0 1 of reading 0 025 of full scale 1000 V range 0 1 of reading 0 05 of fuil scale continues on next page REV B AUG 1980 i 1 7 Specitication DM 501A Table 1 1 cont Characteristics Performance Requirements Suppiemental Information AC VOLTMETER REAR INTERFACE INPUTS Accuracy for 200 mV 2 V 20 V 200 V and 500 V ranges 18 C to 28 C 200 mV to 200 V range 40 Hz to 10 kHz input signal must be between 5 and 100 of full scale input The 500 V range is limited to between 200 V peak and 100 V rms 1 6 of reading 0 05 of full scale 20 Hz to 40 Hz and 10 kHz to 20 kHz 2 0 of reading 0 05 of full scale 500 V range 40 Hz to 10 kHz 1 6 of reading 0 2 of full scale 20 Hz to 40 Hz and 2 0 of reading 0 2 of full 10 kHz to 20 kHz scale 0 C to 18 C 28 C to 50 C 200 mV to 200 V range 40 Hz to 10 kHz 1 1 8 of reading 0 075 of fuli scale 20 Hz to 40 Hz and 1 2 3 of reading 0 075 of full 10 kHz to 20 khz scale 500 V range 40 Hz to 10 kHz 1 8 of reading 0 3 of full scale 20 Hz to 40 Hz and 2 3 of reading 0 3 of full 10 kHz to 20 kHz scale DECIBELS dB TRUE RMS REAR INT
33. see Fig 3 1 is used to select either front panel inputs or rear interface inputs In all functions except temperature the LOW input connects to the main board floating ground LO through switches S4 A and S1 M A dc voltage applied to the VOLTS A connector passes through switches S1 C and St E to the top of the attenuator resistor series network consisting of R1112A R1104 20 Vdc R11128 R1110 200 Vdc R1112C R1114 1000 Vdc and R1112D The bottom end pin 8 of R1112D is connected to floating ground through swtich S1 E and S1 M Theinput signal attenuationis selected by pressing the desired range switch for either 200 mV 2 V 20 V 200 V or 1000 V The attenuated signal couples through switches S1 F S1 D S1 J S1 L and S1 N The signal flows through R1613 located on Diagram 2 tothe Analog Converter U1601 pin 15 Resistor R1613 is a current limiting component that protects U1601 from overioad in the ac voltage function see Fig 3 2 switch S1 C is open depressed position and capacitor C1100 ac couples the input signal to the attenuator Capacitors Hi TO A D CONVERTER LO 2749 36 Fig 3 1 Dc volts switching 3 1 Theory of Operation DM 501A vVOLTS Q S4 A A EXT fT HI S1 L SN TO A D CONVERTER LO 2749 37 Fig 3 2 Ac volts switching C1110 C1114 20 Vac and C1112 comprise the 20 Vac compensation Capacitors C1126 C1128 200 Vac and C1122 comprise the 200 Vac compen
34. und Stromwert entsprechend sind Ersatz von Sicherungen ist nur von geschultem Personal vorzunehmen Arbeiten Sie nicht in explosiver Umgebung Zur Vermeidung von Explosionen ist die Inbetriebnahme dieses Ger tes in explosiver Umgebung zu unterlassen wenn das Ger t nicht daf r geeignet ist Entfernen Sie keine Geh useabdeckungen Zur Vermeidung von Personensch den sind keine Geh useteile zu entfernen Auch ist das Ger t ohne Geh use nicht in Betrieb zu nehmen Arbeiten Sie nicht ohne Geh useabdeckung Zur Vermeidung von Personensch den ist das Ger t nicht ohne Geh use in Betrieb zu nehmen Der Einschub solite nicht ber einen Verl ngerungsadapter betrieben werden SICHERHEITSANGABEN F R DEN SERVICE NUR F R GESCHULTES PERSONAL Beziehen Sie sich auch auf die vorangehenden Sicherheitsangaben f r den Anwender F hren Sie keine Servicet tigkeiten alleine durch Nehmen Sie an dem Ger t keine Service oder Einstellarbeiten vor wenn nicht eine andere Person ver f gbar ist um im Bedartstall Erste Hilfe oder Wiederbelebungsversuche zu leisten Lassen Sie besondere Vorsicht walten wenn Sie an einem unter Spannung stehenden Ger t arbeiten An verschiedenen Stellen im Ger t liegen hohe und damit gef hrliche Spannungen Zur Vermeidung von Personenschaden sind soiche Stellen und Bauteile nicht zu ber hren w hrend Betriebsspannung anliegt Vor dem Entfernen von Geh useteilen L ten oder Ersetzen von Bauteilen ist i
35. 0 00 mA 1900 0 mA 1 9041 to 1 8959 1 9062 to 1 8938 19 041 to 18 959 19 062 to 18 938 190 41 to 189 59 190 62 to 189 38 1904 1 to 1895 9 1906 2 to 1893 8 4 7 Calibration Procedure DM 501A Performance Check Procedure Table 4 8 FRONT PANEL AC CURRENT ACCURACY DISPLAY LIMITS Ambient Temp Range Ambient Temp Range Range Current 18 C to 28 C 0 C to 18 C 28 C to 50 C 200 uA 190 00 uA 191 24 to 188 76 191 48 to 188 52 2 mA 1 9000 mA 1 9124 to 1 8876 1 9148 to 1 8852 20 mA 19 000 mA 19 124 to 18 876 19 148 to 18 852 200 mA 190 00 mA 191 24 to 188 76 191 48 to 188 52 2000 mA 1900 0 mA 1912 4 to 1887 6 1914 8 to 1885 2 Tabie 4 9 TEMPERATURE LiMITS DISPLAY LIMITS Temperature Probe Calibrated To Instrument Any Probe Ambient Temp Range Ambient Temp Range 18 C to 28 C 0 C to 18 C 18 C to 28 C 0 C to 18 C 28 C to 50 C 28 C to 50 C AA SE 62 C 60to 64 58 5 to 65 5 58 to 66 56 5 to 67 5 125 C 123 to 127 4121 5 to 128 5 121 to 129 4119 5 to 130 5 N 200 C 194 to 200 T192 5 to 201 5 192 to 202 190 5 to 203 5 Tabie 4 10 REAR INTERFACE DC VOLTAGE ACCURACY DISPLAY LIMITS De Calibration Ambient Temp Range Ambient Temp Range Range Voltage 18 Cto 28 C 0 G to 18 C 28 C to 50 C 4 8 Range 200 mV 2V 29 V 200 mV 500 V Range 200 Q 2kQ 20 kQ 200 kQ 2000 KN 20 MQ REV A J
36. 0 dB 40 dB 40 dB 20 d8 20 dB 20 dB FRONT PANEL d8m ACCURACY Calibration Frequency 20 Hz to 20 kHz 20 dB to 15 dB 20 Hz to 10 kHz 15 dB to 20 dB DISPLAY LIMITS Calibration Ambient Temp Range Ambient Temp Range Voitage 18 C to 28 C 0 C to 18 C 28 C to 50 C 7 746 mV 5 to 5 1 1 to 1 1 77 46 mV 19 5 to 20 5 18 9 to 21 1 0 7746 mV 19 5 to 20 5 20 Hz to 2 kHz 18 9 to 21 1 20 Hz to 2 kHz 18 5 to 21 5 2 kHz to 10 kHz 17 9 to 22 1 2 kHz to 10 kHz 7 746 mV 19 5 to 20 5 20 Hz ta 2 kHz 18 9 to 21 1 20 Hz to 2 kHz 18 5 to 21 5 2 kHz to 10 kHz i 17 9 to 22 1 2 kHz to 10 kHz 77 46 mV 774 6 mV 5 to 5 1 1 to t 1 1 19 5 to 20 5 18 9 to 21 1 When a 2 is displayed the DM SOTA overranges flashing display and illuminates the upper segment of the 1 in the most significant digit Range 40 dB 40 dB 40 dB 20 dB 20 dB 20 dB Table 4 5 FRONT PANEL dBV ACCURACY Calibration Frequency 20 Hz to 20 kHz 20 dB to 15 dB 20 Hz to 10 kHz 15 dB to 20 dB DISPLAY LIMITS Calibration Ambient Temp Range Ambient Temp Range Voltage 18 C to 28 C 0 C to 18 C 28 C to 50 C NIAAA ALTE RR IRE RNAI BYTE RES I BE R RER RE 10 mV Sito 5 1 to 11 100 mV 18 9 to 21 1 19 5 to 20 5 20 Hz to 2 kHz 18 9 1o 21 1 20 Hz to 2 kHz 18 5 to 21 5 2 kHz to 10 kH
37. 0V 200 kQ 10 0 uA 20V 2000 kN 1 0 uA 20V 20 MQ 0 1 uA 20V LO 200 Q 1 0 2 kQ 0 1 20 kQ 10 0 200 kQ 1 0 2000 KG 0 1 20 MO 0 1 1 4 REV A AUG 1979 Characteristics Maximum Resolution Response Time Maximum Open Circuit Voltage input Connectors Accuracy for 200 uA 2 mA 20 mA 200 mA and 2000 mA ranges 18 C to 28 C 0 C to 18 C 28 C to 50 C Response Time input Resistance Maximum Input Current Table 1 1 cont Performance Requirements I DC AMMETER 0 2 of reading 0 015 of full scale 0 3 of reading 0 025 of full scale Specitication DM 501A Supplemental information 10 mA lt 2 seconds 200 Q to 2000 kn lt 10 seconds 20 MQ scale 6 V Front panel EXT or rear interface INT lt 1 second Approximate Range Resistance 200 uA 10 KQ 100 0 Q 102 N 12 NQ 04 Q 2 A any range Maximum Open Circuit Input A 250 V peak Voltage mA to LOW Maximum Floating Voltage mA to ground ON 1000 V peak LOW to ground ooo 1000 V peak Input Connectors A A See ea Eront panel only Maximum Resolution OA Accuracy for 200 uA 2 mA 20 mA 200 mA and 2000 mA ranges 20 Hz to 10 kHz Sinewave 18 C to 28 C AC AMMETER 0 6 of reading 0 05 of full scale 0 C to 18 C 28 C to 50 Q 0 7 of reading 0 075 of full Response Time input Resistance scale Input current must be between 5 and 100 of full scale
38. 5 5 1 3 b for class 5 steps 4 and 5 shall be performed before step 2 Aiso the instrument shall not be operating during step 6 paragraph 4 5 5 1 3 e class 5 While operating condensed moisture shali not be present on class 5 instruments Drying of the instrument for this class may be performed in a suitabie chamber if necessary 1 10 Specification DM 501A Table 1 4 TM 500 SYSTEMS ENVIRONMENTAL SPECIFICATION Characteristics TM 501 TM 503 TM 504 TM 506 TM 515 Temperature Meets same test standards as plug in Operating Non operating Humidity Meets same test standards as plug in Operating Non operating Altitude Meets same test standards as plug in Operating Non operating Vibration Operating 0 26 mm 0 010 in disp 10 55 Hz sine wave 0 38 mm 0 015 in 75 min total disp 10 55 Hz sine wave 75 min Shock Operating 20 g s 1 2 sine 11 ms 18 shocks 30 g s 1 2 sine 11 ms 18 shocks Bench Handling Meets same test standards as plug in Operating Electric Discharge Meets same test standards as plug in Operating Transportation Meets same test standards as plug in Vibration Package Drop PEA AAA AAA AA IE ARIS Table 1 5 PHYSICAL CHARACTERISTICS Characteristics Description Finish Anodized aluminum panel and chassis Net Weight 2 5 lbs 1 13 kg Overall Dimensions 2 633 in 66 8 mm W x 11 240 in 285 3 mm D x 4 961 in 125 9 mm H 1 11
39. A CONTROLS AND CONNECTORS 1 41 2 digit LED readout with decimal point positioned by the selected range push button switch Range selector push button switches for volts ohms current or decibel measurement Front panel mA input used in conjunction with the LOW input for current measurement Temperature probe input connector Chassis ground binding post oo esa inputs for volts ohms and decibel measurements O Temperature input function push button INPUT N Push button selects either rear interface inputs or front panel inputs for measurement mA Ac current function push button Dc current function push button Push button selects Hi or LO as probe tip voltage tor measuring ohms 12 Ohms function push button VOLTS 13 AN Decibel function push button used in con junction with the AC volts push button Ac volts function push button 15 De volts function push button English 2 2 Release latch Pull to remove plug in N Refer to General Operating Information General Operating Information With the DM 501A properly installed in the power module and the power switch on allow thirty minutes warm up time for operation to specified accuracy Select the desired measurement function and range When the value of the quantity measured is unknown select the highest range first Decrease the range setting until the display reads between 10 and 100 of the full scale reading
40. AN 1980 Table 4 11 REAR INTERFACE AC VOLTAGE ACCURACY Ac Calibration Voltage 7 000 V Mid 193 14 to 193 90 to 193 57 to 186 86 186 10 186 43 190 00 V 194 0 to 194 8 to 194 9 to 186 0 185 2 185 1 Table 4 12 19 314 to 18 686 Calibration Procedure DM 501A Performance Check Procedure DISPLAY LIMITS Ambient Temp Range 18 C to 28 C 40 Hz to 20 to 40 Hz 40 Hz to EL MESE e kHz PU i SM to 20 kHz 10 kHz 19000mV 1981400 186 86 1 9000 V 1 9314 to 1 9390 to 1 8686 1 8610 19390to0 1935710 to 186 10 19 390 to 18 610 REAR INTERFACE RESISTANCE ACCURACY Resistance 190 00 Q 1 9000 kN 1 9032 to 1 9032 to 1 8968 1 8968 19 000 kQ 190 00 kQ 193 57 to 186 43 1 9357 to 1 8643 19 357 to 18 643 DISPLAY LIMITS Ambient Temp Range 18 C to 28 C 19 032 to 18 968 190 34 to 189 70 19 032 to 18 968 190 32 to 189 68 190 32 to 189 68 Ambient Temp Range 0 C to 18 C 28 C to 50 C 20 ta 40 Hz 10 to 20 kHz 194 52 to 185 48 1 9452 to 1 8548 19 452 to 18 548 194 52 to 185 48 195 9 to 184 1 Ambient Temp Range 0 C to 18 C 28 C to 50 C A m 1 9062 to 1 8938 19 062 to 18 938 190 62 to 189 38 1900 0 kQ 1903 2 to 1906 0 to 1906 2 to 1896 8 1894 0 1893 8 19 000 MQ 19 098 to 19 233 to 18 902 18 767 LO 190 64 to 189 40 1 9062 to 1 8938 19 062 to 18 838 190 62 to 189 38 1923 3 to 1876 7
41. Bbereich gewahit werden Der MeBbereich ist zu ver kleinern bis der MeBbereich zwischen 10 und 100 der Maximalanzeige liegt In diesem MeBbereich liegt die h chste Aufl sung vor Bei Anliegen eines Signals was eine Anzeige von mehr ais 19999 bewirkt entsteht zum Erkennen des berlaufs ein Blinken Das Blinken zeigt also an da das Eingangs signal gr er ist als der gew hlte MeBbereich im 1000 V Gleichspannungs und im 500 V Wechsel spannungsbereich erfolgt bei Bereichs berschreitung kein Blinken der Anzeige VORSICHT Eine Zerst rung des Me ger tes kann durch berschrei ten des maximal zul ssigen Eingangssignals erfolgen Eingangs Verbindungen A Uber vier Eing nge k nnen von der Frontseite her MeB Signale eingespeist werden Der Voit Ohm und LOW Eingang dient zur Messung von Gleichspannung Wechselspannung dBV dBm und Widerstand Der mA und LOW Eingang dient Gleichstrom und Wechseistrommessungen ber die Drucktaste EXT INT werden die frontseitigen Eing nge oder die r ckseitigen Interfaceeing nge gew hlt Die r ckseitigen AnschluB stifte 28A LO und 28B HI werden zur Messung von Spannung dB und Widerstand verwendet Der TEMP Eingang steht f r Temperaturmessungen zur Verf gung VORSICHT Um eine Besch digung der Anlage zu vermeiden darf die Spannung an den Stiften 28A und 288 der r ck seitigen Interfaceverbindungen max 200 Vs betragen Unter blichen MeBbedingungen liegt der
42. C LOW mA LOW mA AC dB AC VOLTS AC LOW VOLTS AC dB 4 RIRE TELE dB VOLTS AC dB 408B 20dB dB 20dB 15 6 35 6dB
43. ERFACE INPUTS Accuracy for 40 dB 20 dB 0 dB 20 dB and 40 dB ranges 18 C to 28 C 20 dB to 15 dB 30 6 dB 20 Hz to 20 kHz 15 dB to 20 dB 06 dB 20 Hz to 2 kHz Typically 1 6 dB 2 kHz to 10 kHz 2 6 dB 10 kHz to 20 kHz 0 C to 18 C 28 C to 50 C 20 dB to 15 dB 1 2 dB 20 Hz to 20 kHz 15 dB to 20 dB 1 2 dB 20 Hz to 2 kHz Typically 2 2 dB 2 kHz to 10 kHz 3 2 dB 10 kHz to 20 kHz 1 8 REV B JAN 1980 Specification DM 501A Table 1 1 cont Characteristics Performance Requirements Supplemental information OHMMETER REAR INTERFACE INPUTS Accuracy for 200 2 2 kO 20 kQ 200 kQ 2000 kQ and 20 MQ ranges 18 C to 28 C 200 2 to 200 kQ LO Q 0 15 of reading 0 015 of full 2 kQ to 2000 kQ HIN scale 0 02 Q 2000 kQ LO Q 0 3 of reading 0 015 of full scale 0 02 2 20 MQ HIQ 0 5 of reading 0 015 of full scale 0 02 Q 0 C to 18 C 28 C to 50 C 200 Q to 200 KN LO Q 2 kN to 2000 kQ HIN 2000 KO LO Q 20 MQ HIQ 0 3 of reading 0 025 of full scale 0 020 1 2 of reading 0 025 of full scale 0 02 Q Tabie 1 2 MISCELLANEOUS Characteristics Description Power Consumption Approximately 9 watts Reading Rate 3 1 3 per second Over range indication Flashing display except on 500 Vac and 1000 Vdc ranges Calibration Interval 1000 Hours of operation or 6 months whichever occurs first Warm up Time 30 minute
44. Hz to 10 kHz 17 8 to 22 2 2 kHz to 10 kHz 19 4 to 20 6 20 Hz to 2 kHz 18 8 to 21 2 20 Hz to 2 kHz 18 4 to 21 6 2 kHz to 10 kHz 17 8 to 22 2 2 kHz to 10 kHz 20 dB 10 mV 20 dB 100 mV 1 3 to 1 3 20 dB 1V 19 4 to 20 6 18 7 10 21 3 When a 2 is displayed the DM 501A overranges flashing display and ifiuminates the upper segment of the 1 in the most significant digit 4 10 REV JAN 1980 Calibration Procedure DM 501A Adjustment Procedure ADJUSTMENT PROCEDURE Introduction Use this Adjustment Procedure to restorethe DM 501A to original performance requirements This Adjustment Procedure need not be performed unless the instrument fails to meet the Performance Requirements of the electrical characteristics listed in the Specification sec tion or if the Performance Check procedure cannot be completed satisfactorily if the instrument has undergone repairs the Adjustment Procedure is recommended Satisfactory completion of all adjustment steps in this procedure ensures that the instrument will meet the Performance Requirements Test Equipment Required The test equipment or equivalent listed in Table 4 1 is required for adjustment of the DM 501A Specifications given for the test equipment are the minimum necessary for accurate adjustment All test equipment is assumed to be correctly calibrated and operating within spec ifications If oth
45. LOW Ein gang auf dem Massepotential des MeBobjektes Um die Chassismasse des DM 501A auf Massepotential zulegen kann der LOW Eingang mit der Ger temasse verbunden werden Es ist dabei zu beachten da8 der LOW Eingang dann ber das 3 adrige Anschlu kabel mit Erdpotential verbunden ist Bedienungsanteitung DM 501 A Bild 2 2 Bedienungselemente und Stecker i German 2 3 Bedienungsanleitung DM 501A VORSICHT Vermeidung von elektrischen Stromschl gen beim Umgang mit dem DM 501A 1 Betr gt die zu messende Spannung mehr als 42 5 Vs ist die Ber hrung spannungsf hrender Leiter zu vermeiden 2 Vor dem Abklemmen der Me leitungen am DM 501A und vor dem Herausnehmen des DM 501A aus der Versorgungseinheit sind die Me leitungen von der zu messenden Spannungsquelle zu trennen Gleichspannungsmessungen Bet tigen Sie die Drucktaste VOLTS DC Gleichspan nung und eine entsprechende Bereichstaste Die zu messende Spannung ist an die Eingangsbuchsen LOW und VOLTS Q zu legen wobei die maximal zul ssige Spannung wie auf der Frontplatte bezeichnet nicht berschritten werden darf Das Dispiay zeigt ein Zei chen an wenn der positive Pol der zu messenden Spannung an der Eingangsbuchse VOLTS Q und der negative Pol an LOW liegt Im umgekehrten Fall erscheint im Display ein Zeichen Bei kurzgeschlossenen Eingangsbuchsen zeigt das Display Null an Gleichstrommessungen Bet tigen Sie die Dru
46. NG INHIBIT INPUT OVERRANGE 1 220 000 SIGNALS UNDERRANGE 1 799 OVERRANGE UNDERRANGE DO NOT REPEAT UNTIL THE NEXT CONVERSION CYCLE OVERRANGE 2 225 000 Fig 3 10 LD121 data output waveforms 3 8 e Section 4 DM 501A CALIBRATION PROCEDURE PERFORMANCE CHECK PROCEDURE introduction This procedure checks the electrical performance requirements as listed in the Specification section in this manual Perform the Adjustment procedure if the instru ment fails to meet these checks In some cases recalibra tion may not correct the discrepancy circuit trouble shooting is then indicated Also use this procedure to determine acceptability of performance in an incoming inspection facility Calibration Interval To ensure instrument accuracy check the calibration every 1000 hours of operation or at a minimum of every six months if used infrequently Services Available Tektronix Inc provides complete instrument repair and adjustment at local field service centers and at the factory service center Contact your local Tektronix fieid For convenience many steps in this procedure check the performance of this instrument at only one valueinthe specified performance range Any value within the office or representative for further information specified range within appropriate limits may be sub Test Equipment Required stituted Performance requirements for various tem perature ranges are listed in this
47. S Q LOW A R2 1 ko LOW VOLTS Q 6 V 2 1 LE me x BABE HI LO HI LO 200 Q ln ima 02V 0 2V ImA 1004A 2 0V 0 2V 2 0V 0 2V i 20kQ 200kQ 0 2V 2000kQ 0 2V 7 20M2 0 1mA 2 0V REV A AUG 1980 TEMP P6601 TE MP MLE HUM SHI AO FR y TO DUT VOR ht d UAR DUT P 6601
48. U1737 pin 6 appliesthis temperature probe signal to a network consisting of components R1931 CR1935 R1935 R1932 R1933 CR1934 and R1934 This network helps compensate for the non linear function of the temperature probe With diode CR1935 setting a break point at an equivalent 75 C and diode CR1934 setting a break point at approximately 125 C the output is somewhat linearized and equal to 1 mV C times probe temperature When the front panei TEMP C push button is depress ed switch S1 N couples this temperature output to Analog Converter U1601 pin 15 Analog to Digital Converter The analog to digital converter a d converter in the DM 501A uses a Siliconix type LD120 analog converter U1601 and a type LD121 digital converter U1603 to convert the analog input voltage to a digital representa tion The Analog Converter U1601 contains an input buffer integrator comparator and an auto zero amplifier The Digital Converter U1603 contains the necessary control logic for the analog converter as weil as the buffers multiplexers latches and counters needed to drive the display circuitry Theory of Operation DM 501A The basic sensitivity of the a d converteris 2 V full scale indication which is set by R1505 2 Vdc The 200 mV full scale input for the a d converter is set by R1504 200 mVdc when the relay K1505 is energized through switches S1 and S2 The 2 Vdc 0 R1405 is used to setthe initial zero for the a d
49. ch exposed connections and components while power is on Disconnect power before removing protective panels soldering or replacing components Power Source This productis intendedto operate from a power source that will not apply more than 250 volts rms between the supply conductors or between either supply conductor and ground A protective ground connect on by way of the grounding conductor in the power cord is essential for safe operation REV A AUG 1980 vii DM 501A RECAPITULATIF DES CONSIGNES DE SECURITE Le texte ci dessous divis en deux parties r sume les consignes de s curit qui doivent tre observ es toutes les phases de l utilisation de la maintenance et des r parations de l appareil Consignes de s curit destin es aux utilisateurs Les consignes g n rales de s curit s adressent la fois aux utilisateurs et au personnel de maintenance Avertissements et pr cautions respecter sont annot s au long de ce manuel chaque fois que l utilisation du DM 501A l exige TERMES Dans ce manuel Les nota d nomm s Attention indiquent les circonstances ou les manipulations pouvant provoquer des d t riorations de l appareil ou de tout autre quipement associ Les nota d nomm s Avertissement indiquent les circonstances ou les manipulations pouvant entrainer blessures corporelles ventuellement mortelles Grav s sur l appareil CAUTION lattention Ce mot identifie les zones de risqu
50. chaften sind durch US und Auslandspatente und oder schwebende Patente abgedeckt TEKTRONIX TEK SCOPE MOBILE und dif sind gesch tzte Warenzeichen von Tektronix inc Gedruckt in U S A Spezifikations und Preis nderungen bleiben vorbehalten 1974 1980 TEKTRONIX TEK SCOPE MOBILE INSTRUMENT SERIAL NUMBERS Each instrument has a serial number on a panel insert tag or stamped on the chassis The first number or letter designates the country of manufacture The last five digits of the serial number are assigned sequentially and are unique to each instrument Those manufactured in the United States have six unique digits The country of manufacture is identified as follows 8000000 100000 200000 300000 700000 Tektronix Inc Beaverton Oregon USA Tektronix Guernsey Ltd Channel Islands Tektronix United Kingdom Ltd London Sony Tektronix Japan Tektronix Holland NV Heerenveen The Netheriands DM 5014 OPERATORS SAFETY SUMMARY The general safety information in this part ofthe summary is for both operating and servicing personnel Specific warnings and cautions will be found throughout the manual where they apply but may not appear in this summary TERMS
51. checking this fuse Ac Voltage and dB Measurements For ac voltage measurements press the VOLTS AC push button and an appropriate range button Connect the unknown voltage between the LOW and VOLTS Q input connectors The ac voltage and dB measurements are made with an ac only calculating true rms to dc converter Voltages can be measured with a crest factor up to four The crest factor is the ratio of the peak voitage to rms voitage Press the VOLTS AC and dB push buttons with an appropriate range button A 20 dB dynamic range exists when any one range push button is pressed except in the 40 dBrange The dB measurementis obtained by adding the displayed value to the selected range For example 15 6 displayed reading on the 20 dB range cor responds to a 35 6 dB signal When inthe 40 dB range the maximum displayed value must be limited to 416 2 dBm or 14 dBV because of the 500 Vac maximum rating of the instrument English 2 4 When the DM 501A is shipped the O dB reference is 1 mW into 600 Q 0 7746 V AO dB reference of 1 Visalso available through an internal jumper see the Calibration Procedure WARNING Refer jumper change to qualified personnel Ac Current Measurements To measure ac current press the mA push button and an appropriate range button Connect the unknown ac current to be measured between the mA and LOW input connectors The ac current measurements are made using an ac onty calculating true r
52. chsendwert im Display aufge f hrt Die maximal an den Buchsen LOW und VOLTS Q verf gbare Leerlaufspannung betr gt 6 V Tabelle 2 1 Ohmmeter Strom und Spannung Mef max MeBspannung bereich Me strom bei Bereichs Endwert HI LO HI LO 200 Q 1mA 1 mA 0 2 V 0 2 V 2kQ 1mA t100pA 2 0 V 0 2 V 20kQ 100u 10pA 20V 02V 200kQ 10pA 1pA 20V 02 V 2000 kQ 1 uA 0 1 uA 2 0 V 0 2 V 20MQ OimA 01pA 20V 2 0 V Temperaturmessungen SchlieBen Sie den Temperaturtastkopf P 6601 an die Eingangsbuchse TEMP an wobei auf richtige Ausrich tung der Steckerstifte geachtet werden mu Bet tigen Sie die Drucktaste TEMP C und legen Sie die Tastkopf spitze an das MeBobjekt Vor der Me wertfeststellung ist eine ausreichende Zeit zur Wertstabilisierung zuzu lassen Diese Zeit ist abh ngig von der thermischen Masse und dem W rmewiderstand des Temperaturtast kopfes und des MeBobjektes sowie von der Temperatur des MeBobjektes Detaillierte Angaben ber Temperatur messungen und die Anwendung des Temperaturtast Bedienungsanleitung DM 501A kopfes entnehmen Sie bitte dem Handbuch des P 6601 Eine Aufstellung ber das Standardzubeh r und Bestell Nr befindet sich bei der St ckliste der mechanischen Bauteile Verpackungshinweise Sollte dieses Tektronix Me ger t einmal an eine Tektronix Servicestelle geschickt werden so legen Sie dem Ger t einen Anh nger mit Namen und Adresse des Besitzers der Ger te Serien Nr und der gew nschten
53. cktaste mA DC Gleichstrom und eine entsprechende Bereichstaste Der zu messen de Strom ist ber die Eingangsbuchsen LOW und mA zu f hren Die konventionelle Stromrichtung in die Buchse mA hinein und aus der Buchse LOW heraus bewirkt ein Zeichen im Display Ein Schutz des Strom eingangs erfolgt durch eine Sicherung auf der Druck platte im DM 501A Eine berpr fung der Sicherung sollte nur von geschul tem Personal vorgenommen werden Wechselspannungs und dB Messungen F r Wechselspannungsmessungen ist die Drucktaste VOLTS AC Wechselspannung und eine entsprechende Bereichstaste zu bet tigen Die zu messende Spannung ist an die Eingangsbuchsen LOW und VOLTS Q zu legen Die Wechselspannungs und dB Messungen erfolgen mit Hilfe eines Wechsel spannungs Echteffektiv Gleichspannungskonverters 2 4 German wobei b s zu einem Crestfaktor von 4 gemessen werden kann Der Crestfaktor ist definiert als das Verh ltnis von Spitzenspannung zu Effektivspannung Bet tigen Sie die Drucktasten VOLTS AC und dB sowie eine entsprechende Bereichstaste In jedem der mit den Drucktasten gew hlten Bereiche bis auf die 40 dB Bereichstaste liegt ein Dynamikumfang von 20 dB vor Die dB Messung erfolgt durch Addition des im Display angezeigten Wertes mit dem des gew hlten dB Bereichs z B ein angezeigter Wert von 15 6 mit einem gew hiten Bereich von 20 dB ergibt ein Me signal von 35 6 dB im 40 dB Bereich ist der maximal zula
54. ction Mesure de r sistance 880 VOLTS AN Bouton de commande de la fonction Mesure de niveaux d cibels utilis conjointement avec le bouton poussoir de mesure de tension alternative Bouton de commande de ia fonction Mesure de tension alternative Bouton de commande de la fonction Mesure de tension continue Loquet de verrouillage Tirer pour extraire le tiroir Co 2 2 French IN Se reporter aux informations g n rales sur l utilisation Informations g n rales sur l utilisation Le DM 501A tant correctement mis en place et le mo dule d alimentation plac sous tension pr voir un temps de mise en chauffe de 30 minutes pour obtenir la pr cision annonc e S lectionner ensuite la nature de la mesure d sir e et la gamme Lorsque la valeur de la quantit mesur e est inconnue s lectionner au d part la plus haute gamme Choisir ensuite une gamme plus basse jusqu ce que l affi chage soit compris entre 10 et 100 de la pleine chelle On obtient ainsi une r solution maximale Si un signal d en tr e provoque un affichage sup rieur 19999 c est dire sup rieur l affichage pleine chelle de la gamme s lec tionn e l affichage clignote indiquant ainsi qu il y a d pas sement de la capacit d affichage de la gamme consid r e La gamme de 1000 V continu et 500 V alternatif ne provoque aucun clignotement de l affichage sit le signal d entr e exc de la tension
55. design Clock The clock for the LD121 U1603 consists of Q1435 crystal Y1425 and associated circuitry This clock circuit is a Pierce coupled oscillator that oscillates at 163 84 kHz Decimal Point Circuitry The decimal point circuit is composed of U1703 U1705 U1707 and associated circuitry The decimal point line is only enabled when one of the range switches is selected and anded with a digit select line to turn on Q1805 The anded signal pulls the decimal point line high turning on the appropriate decimal point at the correct time U D DUTY CYCLE A U D DUTY CYCLE 8 DUTY CYCLE COUNTER STATE CLOCK 7 8 9 10 11 12 13 14 15 Fig 3 9 Modulo 16 dual duty cycte counter wavetorms 3 7 Theory of Operation DM 501A Power Supply The 25 Vac input to isolation transformer T1301 is supplied from the power module through rear interface pins 13A and 138 The output voltage from pins 7 and 9 is rectified by CR1422 and applied to U1325 and U1335 These three terminal reguiators provide the 15 V source and 12 V source 32 CLOCK CYCLES The output voltage trom T1301 pins 10 and 12 is rectified by CR1424 and CR1426 and applied to U1431 This three terminal regulator provides the 5 V source Ail three terminal regulators are internally current limited peso CLOCK a gg nn lm 9 _ a L D D Di Bo Bi B DATA 2 7 9 SIGN OR UR emu a ura m BLINKI
56. dienung und richtige Stromversorgung der Versorgungseinheit beziehen Sie sich bitte auf die Be dienungsanleitung Ihrer TM 500 Versorgungseinheit VORSICHT Vor dem Einsetzen oder Herausnehmen des DM 501A ist die Versorgungseinheit unbedingt auszuschalten um an den r ckseitigen Kontaktleisten Funkenbildung zu ver meiden die die Funktionsdauer der Kontakte einschr n ken w rde und evtl Schaltkreise im Ger t besch digen k nnte berpr fen Sie ob der Plastiksteg der Verbindungs buchse im Fach der Versorgungseinheit mit dem Aus schnitt in der Steckverbindungsleiste der DM 501A Platine bereinstimmt Setzen Sie den Einschub nicht ein bevor das berpr ft wurde Bei bereinstimmung setzen Sie das DM 501A Chassis in die obere und untere F hrung siehe Abb 2 1 des gew hiten Faches und schieben es mit dem n tigen Druck so weit ein bis die r ckseitige Steckverbindungsleiste einrastet Nach Ein schalten der Versorgungseinheit solite das LED Display aufleuchten Zum Herausnehmen des DM 501A ziehen Sie die Entriegelungsklinke an der linken unteren Ecke des Ein schubes bis sich die r ckseitige Steckverbindung l st Nun kann das DM 501A dem Fach entnommen werden OBERE FUEHRUNGSNUT UNTERE FUEHRUNGSNUT 1G 1431 21 2749 2 Bild 2 1 Ein und Ausbau REV A AUG 1980 German 2 1 Bedienungsanleitung DM 501 A BEDIENUNGSELEMENTE UND STECKVERBINDUNGEN O 4 1 2 stellige LED Anzeige mit Dezimalpunkt ab h
57. e Check Procedure Table 4 1 cont Performance Requirements Applications Range 0 to 20 MQ accuracy 0 05 Description Example Resistance Standard Ohmmeter accuracy check Electro Scientific industries inc Model DB 62 Dekabox Temperature Bath Nesiab Instruments inc Model ULT 80 Bath Circulator with denatured ethyl alcohol coolant Model TX 9 Circulator with Dow Corning 710 fluid and necessary hoses and adapters Temperature probe check and adjustment Range 62 C to 240 C accuracy 0 25 C Requires a TM 500 series power module Connect the TX 9 cooling coil to the cooling pump in the ULT 80 to obtain temperatures between 10 C and 40 C Dangerous voltages may be encountered in the following steps Caution must be exercised Do not contact the output connectors of the voltage calibrator the input terminals of the DM 501A or the internal circuitry of the DM 5014 FRONT PANEL INPUT ACCURACY CHECKS 1 Check Dc Voltage Accuracy a Set the dc voltage calibrator for a minimum output voltage b Press the VOLTS DC function push button switch c Connect the dc voltage calibrator to the VOLTS Q and LOW connectors through appropriate cables and adapters d Press the range push buttons and set the calibrator voltages as listed in Table 4 2 e Check that the OM 501A display reads within the display limits for the ambient temperature as listed in Table 4 2 f Set the calibrato
58. e bath environment Allow enough time forthe display reading to stabilize e Adjust R1731 TEMP for a display reading of 000 2 to 000 2 f Place the temperature probe in a 100 0 C environ ment Allow enough time for the display reading to stabilize g Adjust R1831 TEMP Set for a display reading of 99 7 to 100 3 h Interaction may occur in TEMP Y and TEMP Set adjustments Repeat step 7 parts d through g as needed Table 4 15 DC VOLTAGE RANGE ADJUSTMENTS Component Location Display Reading 1 8997 1 9003 1 8996 1 9004 18 997 19 003 189 97 190 03 999 80 1000 2 Main Main Attenuator Attenuator Attenuator AC VOLTAGE RANGE ADJUSTMENTS Component Location Display Reading 18 990 19 010 189 90 190 10 Attenuator Attenuator L 3 NE Range Voltage x Table 4 16 Calibration wer Voltage at Range 10 kHz 200 V C1128 200 Vac 500 V 500 00 C1129 500 Vac Attenuator 499 50 500 50 4 13
59. e de blessure non imm diatement perceptibles ou un risque ventuel de d t rioration de l appareil DANGER Ce mot indique les zones de risque imm diat pouvant entrainer blessures ou mort SYMBOLES Dans ce manuel IN Ce symbole de s curit signifie se reporter au manuel Grav s sur l appareil DANGER Haute tension Protection la masse A ATTENTION se reporter au manuel viii REV A AUG 1980 DM 501A Mise la masse du produit La mise la masse du DM 5014 s effectue l aide d un conducteur de masse du cordon d alimentation Pour viter tout choc lectrique ins rer la prise du cordon d alimentation dans une prise de distribution correspon dante avant de connecter l entr e ou les terminaisons de sortie de l appareil Pour utiliser l appareil en toute esie pis connexion la borne de masse au moyen du conducteur de masse au cordon d alimentation est indispensable Utiliser le cordon d alimentation appropri N utiliser que lc cordon d alimentation et la prise recommand s pour votre appareil N utiliser qu un cor don d alimentation en bon tat Pour effectuer les changements de cordons d alimentation et de prises faire appel un personnel qualifi Utiliser le fusible appropri Pour viter tout risque d accident incendie n utiliser que le fusible recommand pour votre appareil Les remplacements de fusible doivent toujours tre en harmonie avec le type la vitesse de tension et la vites se de
60. eadout is within the display limits for the ambient temperatures and frequencies as listed in Table 4 4 Check dBV Mode limits The check procedure is identical to the setup for the dBm Accuracy check with the exception of using the range push buttons and calibrator voitages as listed in Table 4 5 4 3 Calibration Procedure DM 501A Performance Check Procedure Check Ohms Accuracy a Connect aresistance standard to the VOLTS Q and LOW connectors b Press the kQ function push button and the ap propriate Hi or LO push button as indicated in Table 4 6 c Press the range push button and set the resistance standard as listed in Tabie 4 6 d Check that the DM 501A display reads within the display limits for the ambient temperature as listed in Table 4 6 e Remove ali connections 7 Check Dc Current Accuracy a Connect the dc current source to the mA and LOW connectors through appropriate cables and connectors with the positive source to the mA connector b Press the mA DC function push button c Press the range push button and set the current source as listed in Table 4 7 d Check that the DM 501A display readout is within the display limits for the ambient temperature as shownin Table 4 7 e Remove the dc current source and all connections 8 Check Ac Current Accuracy a Connect the precision ac current souce to the mA and LOW connectors through appropriate cables and connectors b Press the
61. entr e pour une lecture pleine chelle sans d passement de ca pacit La tension maximale disponible circuit ouvert sur la prise VOLTS Q par rapport la prise LOW dans la fonction k 2 est d environ 6 V Tableau 2 1 Tension et courant de mesure en ohmmetre Tension maximale pleine chelle Gamme Courant de mesure Tension Tension Tension Tension haute basse haute basse 1 mA 0 2 V 0 2V 0 2V 0 2V 0 2 V 20V Mesures de temp rature Connecter la sonde P6601 la prise TEMP du panneau avant Proc der avec soin l alignement des broches du connecteur Appuyer sur le bouton poussoir TEMP C Ap pliquer l extr mit sensible de la sonde au composant sous test Attendre suffisamment pour que la temp rature de l embout de la sonde se soit stabilis e avant d effectuer une mesure Le temps n cessaire la stabilisation de la lec ture d pend de plusieurs facteurs la masse thermique de la sonde et du composant sous test la r sistance thermique de la sonde et du composant sous test et la quantit de chaleur appliqu e au composant sous test Se reporter au manuel de la sonde P6601 pour avoir des informations compl mentaires sur les mesures de tem p rature et l utilisation de la sonde La liste des accessoires standard avec leur r f rence se trouve dans la liste des pi ces m caniques du manuel Instructions de r emballage pour exp dition Si un appareil Tektronix doit tre exp d
62. er test equipment is substituted calibration setup may need to be altered to meet the requirements of the equipment used Preparation Access to the internal adjustments is achieved most easily when the DM 501A is connected to the power module with a flexible plug in extender Remove the left side cover of the DM 501A to access the adjustments on the main and attenuator boards The electrical shield must be removed to make temperature adjustments See Fig 8 3 in the Diagram section at the rear of this manual Remove the power module cabinet to make ad justments to the DM 501Ainsidethe power module Install the DM 501A in the right side compartment of the power module with its unused compartments on the leff side Make adjustments at an ambient temperature between 21 C and 25 C 70 F and 77 F 1 Check Power Supplies a Set the test voltmeter to the 20 V range b Connectonelead ofthe voltmetertothe 15 V point located on the Main board and the other lead to the LOW test point c Check for a 15 Vreading 6 between 14 1 V and 15 9 V d Disconnect the voltmeter lead from the 15 V point and reconnect this lead to the 12 V point of the Main board REV MAR 1983 e Check for a 12 V reading 16 between 11 28 V and 12 72 V f Disconnect the voltmeter lead from the 12 V point and reconnect this lead to the 5 V point on the Main board g Check for a 5 V reading 16 between 4 70 V and 5
63. g All the functions and ranges are front panel push button selected including the rear interface connector input Readout in dBm or dBV is selected by an internal jumper The unit is shipped with the internal jumper in the dBm position The readout is a 0 4 high 4 1 2 digit display using seven segment LED The decimai point is automatically positioned depending on the selected operating range of the instrument Polarity indication is automatic Accessories Standard accessories include this instruction manual a set of test leads and the TEKTRONIX P6601 temperature probe with its instruction manual The P6601 temperature probe and temperature measurement capabilities are deleted for Option 2 in struments Performance Conditions The electrical characteristics are valid only if the DM 501A has been calibrated at an ambient temperature between 21 C and 25 C andis operating at an ambient temperature between 0 C and 50 C uniess otherwise noted Items listed in the Performance Requirements column of the Electrical Characteristics are verified by completing the Performance Check in the Calibration section of this manual These items are either explanatory notes or performance characteristics for which no limits are specified Table 1 1 ELECTRICAL CHARACTERISTICS Front Panel Characteristics Performance Requirements Supplemental information DC VOLTMETER Accuracy for 200 mV 2 V 20 V 200 V and 1000
64. gh the jme power module three wire power cord REV A AUG 1980 Operating Instructions DM 501A Fig 2 2 Controls and connectors REV A AUG 1980 English 2 3 Operating instructions DM 501A CAUTION To help eliminate shock hazard from voltages measured by the DM 5014 1 if the measured voltage exceeds 42 5 V peak avoid all contact with the voltage source 2 Disconnect test probes from circuit under test before disconnecting probes from the DM 501A or before removing the DM 5014 from the power module Dc Voltage Measurements Press the VOLTS DC push button and an appropriate range button Apply the voltage to be measured to the LOW and VOLTS Q input connectors Observe the max imum input voltage ratings as indicated on the front panel The readout dispiays a reading if the input to the VOLTS Q connector is positive with respect to the LOW input connector A readingis displayedifthe input atthe VOLTS Q connector is more negative With the LOW and VOLTS Q input connectors shorted the display reads zero as to the specifications Dc Current Measurements Press the mA DC push button and appropriate range button Connectthe dc currentto bemeasuredtothe LOW and mA input connectors Conventional current flowing into the mA connector and out of the LOW connector indicates a onthe display The current input is protected with an internal fuse located on the circuit board Refer to qualified personnel when
65. i un centre de maintenance Tektronix pour entretien ou r paration attachez l appareil une tiquette portant les iridications instructions d utilisation DM 501A suivantes nom du propri taire l adresse compl te et le nom du responsable pouvant tre contact Ne pas oublier de mentionner le type complet de l instrument le num ro de s rie et une description de l intervention souhait e Nous vous recommandons de conserver le carton et le mat riel d emballage d origine dans lequel vous avez recu votre appareil Si vous n avez pas pr serv ceux ci embal lez l instrument de la mani re suivante Procurez vous une boite de carton ondul d passant d au moins 15 cm les dimensions de l appareil de ma ni re pouvoir entourer celui ci de mat riaux protec teurs Entourez l instrument d une feuille de poly thyl ne de mani re assurer la protection du boitier Intercalez entre le carton et l instrument de la mous se d ur thane d une paisseur de 7 6 cm de chaque c t Fermez le carton au moyen d une bande adh sive ou d une grosse agrafeuse industrielle Test de r sistance de l emballage pour cet appareil 15 kg cm French 2 5 Kapitel 2 DM 501A BEDIENUNGSANLEITUNG Ein und Ausbauanweisungen Das DM 501A wird kalibriert und gebrauchsfertig ge liefert Es muB zur Anwendung in ein Einschubfach einer TM 500 Versorgungseinheit eingesetzt werden F r die Be
66. iestheintegrator with a current equal to Vin Rz Capacitor C1505 C is disconnected from the integrator output The current developed from Vi causes the integrator output voltageto move from Vaz Digital converter U1603 attempts to keep the integrator output voltage close to Vaz by adding or subtracting units of charge to integrator capacitor C1508 Cin With a unit of charge equal to 14 counts the net amount of charge for correction is totaled by the BCD counters The measure interval can only resolve multiples of 14 counts Override Period The override period immediately follows the measure interval and resolves the last of the measurement The input buffer now connects to the high quality ground and the Caz switch is left open The LD121 U1603 causes the 3 5 Theory of Operation DM 501A COMPARATOR SAMPLE POINTS FOR NEXT DUTY CYCLE SELECTION COMPARATOR INTEGRATOR Yso OUTPUT COUNTER COUNTER CONTENTS 0 CONTENTS 0 COUNTER CONTENTS 14 Measure Interval Timing Vis 1 V Fig 3 7 Measure interval timing DUTY CYCLE CONVERTER STATE M Z INTEGRATOR OUTPUT END OF CONVERSION annm 14 NET COUNTS ADDED 14 NET COUNTS ADDED TO COUNTER TOTAL TO COUNTER TOTAL companaron L1 Lf LI L LL Fig 3 8 Algorithm waveforms at end of measure interval 3 6 integrator to go positive with respect to Vaz see Fig 3 7 then returns it to Vaz potential stopping oniy when the
67. ing From Loss of Ground Upon loss of the protective ground connection ali accessible conductive parts including knobs and controis that may appear to be insulating can render an electric shock Use the Proper Power Cord Use only the power cord and connector specified for your product Use only a power cord that is in good condition Refer cord and connector changes to qualified service personnel Use the Proper Fuse To avoid fire hazard use only the fuse specified in the parts list for your product and which is identical in type voltage rating and current rating Refer fuse replacement to qualified service personnel Do Not Operate in Explosive Atmospheres To avoid explosion do not operate this product in an atmosphere of explosive gases unless it has been specifically certified for such operation Do Not Operate Without Covers To avoid personal injury do not operatethis product without covers or panels installed Do not apply power to the plug in via a plug in extender yi REV A AUG 1980 DM 501A SERVICING SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Refer also to the preceding Operators Safety Summary Do Not Service Alone Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present Use Care When Servicing With Power On Dangerous voltages exist at several points in this product To avoid personal injury do not tou
68. lay limits NOTE Theoutput cable fixture from the calibrating sources to the rear interface pins may have to be modified to accommodate accuracy checks via the rear inter face Range 200 mV 2V 20 V 200 V 1000 V Range 200 mV 2 V 20 V 200 V 500 V Table 4 2 FRONT PANEL DC VOLTAGE ACCURACY Dc Calibration Voltage 190 00 mV 1 9000 V 19 000 V 190 00 V 1000 0 V Ambient Temp Range 18 C to 28 C Table 4 3 FRONT PANEL AC VOLTAGE ACCURACY Ac Calibration Voltage Ambient Temp Range 18 C to 28 C 40 Hz to 20 to 40 Hz 40 Hz to 10 kHz 10 to 20 kHz 10 kHz 190 00 mV 191 24 to 192 00 to 191 67 to 188 76 188 00 188 33 1 9000 V 1 9124 to 1 9200 to 1 9167 to 1 8876 1 8800 1 8833 19 000 V 19 124 to 19 200 to 19 167 to 18 876 18 800 18 833 190 00 V 191 24 to 192 00 to 188 76 188 00 500 00 V 504 0 to 506 0 to 505 5 to 496 0 494 0 494 5 Calibration Procedure DM 501A Performance Check Procedure DISPLAY LIMITS Ambient Temp Range 0 C to 18 C 28 C to 50 C 190 24 to 189 76 1 9024 to 1 8976 19 024 to 18 976 190 24 to 189 76 1001 5 to 998 5 DISPLAY LIMITS Ambient Temp Range 191 67 to 188 33 0 C to 18 C 28 C to 50 C 20 to 40 Hz 10 to 20 kHz 192 62 to 187 38 1 9262 to 1 8738 19 262 to 18 738 192 62 to 187 38 208 0 to 492 0 45 Calibration Procedure DM 5014 Performance Check Procedure Table 4 4 Range 4
69. ltage proportional to dB at pin 5 This dc voltage is then coupled to pin 7 which has a resistor network to set the dB reference current and a jumper 1435 that selects the dBm or dBV mode Ac dB CONVERTER of SEN CF HI TO A O CONVERTER LO 2749 38 Fig 3 3 dB switching REV A JAN 1980 Refer to Fig 3 3 With the jumper in the dBm mode R1535 dB is adjusted for 4 dBm when the dB range switch is depressed and 0 7746 Vac is connected between the VOLTS Q and LOW front panei connectors When the jumper is in the dBV mode and the input signal is 1 000 Vac the display readout is also Y dB The signal at U1429 pin 7 is internally buffered and appliedto pin 6 dB BUF OUT This signal changes approximately 3 mV per 1 dB change The positive temperature coef ficient resistor RT1525 is used to provide compensation for the 0 3 per degree C temperature drift in the dB converter of U1429 Potentiometer R1528 dB Gain in combination with U1538 dB AMP RT1525 and feedback resistor R1536 is used to scale the dB buffer output signal to 100 mV per dB at the input of U1538 pin 6 This output signal feeds through switch sections S3 and S1 to resistor R1613 located on diagram 2 then into the Analog Converter U1601 pin 15 CURRENT SHUNTS Theory of Operation DM 501A When dB is selected the display is limited to 0 1 dB resolution This reduced resolution occurs when dB switch S3 A pin 3 co
70. m diaire d un cavalier interne voir la proc dure d talonnage AVERTISSEMENT Seu un personnel qualifi peut proc der au chan gement du cavalier Pour effectuer des mesures de courant alternatif appuyer sur te bouton poussoir mA et s lectionner la gamme conve nable Appliquer le courant alternatif inconnu mesurer aux prises d entr e mA et LOW Les mesures de courant alternatif s effectuent gr ce un convertisseur tension ef ficace caicul e tension continue Mesures de r sistance Appuyer sur le bouton poussoir kQ et s lectionner la gamme ad quate Le facteur d chelle est fonction de la gamme s lectionn e Pour obtenir la tension maximale pos sible pleine chelle voir tableau 2 1 s lectionner par l in term diaire du bouton poussoir la tension haute Hi ou la tension basse LO L avantage de la fonction HI r side dans son insensibilit au bruit et l effet de thermocouple d fa pr sence de m taux diff rents susceptibles de g n rer des erreurs La fonction LO offre la possibilit d effectuer des mesures de r sistance dans les circuits sans cr er de po larisation directe de la plupart des semi conducteurs au silicium La fonction kQ permet la circulation d un courant constant entre les prises d entr e LOW et VOLTS k 2 Le courant conventionnel circule de la prise VOLTS Q vers la prise LOW Le tableau 2 1 indique les valeurs courant et des tensions maximales appliqu es aux prises d
71. maximale autoris e dans cette gamme ATTENTION L instrument peut tre endommag si le potentiel appliqu est sup rieur amp la tension d entr e maxi male autoris e Connexions d entr e A Les connexions du panneau avant sont compos es de quatre prises d entr e Les prises d entr e VOLTS OHMS et LOW sont utilis es pour les mesures de tension continue tension alternative mesures de niveaux dBV dBm et me sures de r sistance alternative et continue Les prises d en tr e mA et LOW sont utilis es pour les mesures de courant alternatif ou continu Le bouton poussoir EXT INT s lec tionne l entr e au niveau de l interface arri re ou du pan neau avant Les broches 28A LO et 28B HI de l interfa ce arri re sont utilis es pour les mesures de tension de ni veau dB et de r sistance au niveau de l interface arri re La prise d entr e TEMP est utilis e pour les mesures de temp rature Afin d viter tout endommagement du tiroir ne pas appliquer de tension exc dant 200 V cr te entre les broches 28A et 288 du connecteur arri re Lors de mesures classiques la borne d entr e LOW est reli e au commun du circuit sous test Une connexion peut tre tablie entre la prise d entr e LOW et la borne de mas se afin de r f rencer l entr e du DM 501A au chassis de l appareil Des pr cautions sont prendre lorsque la borne LOW est ainsi reli e la terre au moyen du c ble d alimen tation r seau
72. mmer die Betriebsspan nung zu entfernen Netzspannungsversorgung Die Betriebsspannung f r dieses Ger t darf 250 Van nicht berschreiten und ist an die Versorgungsiei tungen bzw an eine Versorgungsleitung und Masse anzulegen Innerhalb des NetzanschluBkabels mu ein Schutzleiter vorhanden sein der mit Ger temasse verbunden ist REV A AUG 1980 xi DM 5014 DM 501A Pe HR 2 7 mi vafra Xu WARNING CAUTION Hif Mix riiv b 5IbOOiG CS CAUTION X JUS AL TAS SBOE A USO AS B ET EAEYISndb9EzdoccikXArsve DANGER Til os ERRE TOR
73. ms to de converter Resistance Measurements Press the kQ function push button and the appropriate range button The scaling factor is a function of the range push buttons only Select the HI or LO function push button for the maximum desired voltage at full scale see Table 2 1 The Hi function advantage is its non susceptibility to noise or thermocouple dissimilar metals generated error signals The LO function advantage is allowing in circuit measurements without forward biasing most silicon type semiconductor components The kQ function provides constant current at the LOW and VOLTS Qinput connectors The conventional current flows from the VOLTS N connector into the LOW connec tor Refer to Table 2 1 for the value of current and maximum voitages across the input connectors for full scale display readings instrument not over ranged The maximum open circuit voltage available from the VOLTS Q connector referenced to the LOW connector in the kQ function is approximately 6 V Table 2 1 OHMMETER SOURCE CURRENT AND VOLTAGE V Max Source Current at Full Scale t m Lo ria HE 200 Q 1mAl ima 02V 02V 2kQ 1mAI100zA 20V 02V UCET TENET 200 kA 10pA twA 20V 02V Range 2000 kQ 1uA Q 14A 20V 02V 20 MQ 0 1 mA 0 1 yA 2 0 V 2 0 M REV A AUG 1980 Temperature Measurements Connect the P6601 temperature probe to the front panel TEMP connector Use care to align the connector pins Press the TEMP
74. nnects 5 V to Digit Select Driver U1701 pin 1 The output of U1701 pin 16 turns on diodes CR1605 and CR1607 disabling the digit select lines for the two least significant digits in the display DS1200 and DS1101 Simultaneously 5 V is coupled through diode CR1711 turning on the SIGN DS1000 in the display This same high level disables integrated circuits U1703A U17038 and U1705B and enables U1705A The decimal point is displayed after the second most significant digit ranges Current Input Circuits o Refer to Fig 3 4 and Fig 3 5 The current input is only available through the front panel mA and LOW connectors Input current to the mA connector flows through fuse F1626 and the appropriate range switch and shunt resistors consisting of R1628A B and C and R1711 and R1713 In dc current function with the mA dc front panel switch S1 J pin 4 closed the voltage drop across the shunt resistors is directly coupied Hi to A D CONVERTER LO 2749 39 Fig 3 4 Dc current switching CURRENT SHUNTS Ac dB CONVERTER TO A D CONVERTER LO 2749 40 Fig 3 5 Ac current switching 3 3 Theory of Operation DM SOTA to the Analog Converter 111601 pin 15 In ac current function the mA ac front panel switch S1 L pin 4 is closed The voltage developed across the input current shunt is coupled to AC Buffer U1539 which is connected by Relay K1528 energizer as a X10 gain amplifier The voltage at pin
75. ntation avant d enlever les panneaux de protection d effectuer des soudures ou de remplacer des composants Source d alimentation Ce produit est concu pour fonctionner partir d une source d alimentation qui n appliquera pas plus de 250 V efficaces entre les conducteurs d alimentation ou entre chaque conducteur d alimentation et la terre Pour utiliser l appareil en toute s curit une connexion la masse au moyen d un conducteur de masse dans le cordon d alimentation est indispensable REV A AUG 1980 ix DM 5014 SICHERHEITSANGABEN Der folgende Text enth lt in zwei Teilen Angaben ber Sicherheitsvorkehrungen die jederzeit bei Betrieb Service und Reparatur des Ger tes beachtet werden m ssen SICHERHEITSANGABEN F R DEN ANWENDER Die allgemeinen Sicherheitsinformationen in diesem Teil der Angaben dienen dem Anwender und Servicepersonal Spezielle Warnungen und Hinweise sind berall im Handbuch zu finden m ssen jedoch in diesen Angaben nicht erscheinen BEGRIFFE in diesem Handbuch VORSICHTSHINWEISE erl utern Bedingungen die zur Zerst rung des Ger tes oder anderer Gegen st nde f hren k nnten WARNUNGSHINWEISE erl utern Bedingungen die zu Personensch den f hren k nnen oder lebens gef hrlich sind Markierungen auf dem Ger t CAUTION VORSICHT weist darauf hin daB durch zuf lliges Ber hren an einer nicht unmit telbar zug nglichen Stelle Personenschaden entstehen kann oder Schaden am Ger t selb
76. on a Press the VOLTS AC function push button b Press the 2 V range push button c Set the ac voltage source frequency to 10 kHz with an output of 0 1000 V rms d Connect the ac voltage source to the LOW connec tor and VOLTS Q connector on the front panel e Adjust R1525 LO Vac for a display reading of 0997 1002 f Set the ac calibrator for a voltage of 1 9000 V rms at 10 kHz g Adjust R1537 2 Vac for a display reading of 1 8995 1 9005 h Interaction may occur in the adjustments of R1525 and R1537 Repeat step 2 part b through part g as needed i Adjust 20 Vac 200 Vac and 500 Vac ranges WARNING Use an insulated shaft adjustment tool when ad justing capacitors C1114 C1128 and C1129 The input potential is connected to the metal topof these capacitors j Using Table 4 16 set the range and the required ac calibration voltage Adjust the selected control for the required display reading 4 12 k Setthe ac voltage calibrator to a minimum voltage 1 Remove connections 5 Adjust dB9 and dB Gain a Press the VOLTS AC push button b Check and note the position of the dBm dBV internal jumper Set the ac calibrator for 77 46 mV dBm or 100 00 mV dBV at a frequency of 10 kHz Cc Press the dB function push button d Press the 20 dB range push button e Adjust R1535 dB for a display reading of 1 to 2 f Set the ac calibrator for 774 6 mV dBm or 1 0000 V dBV
77. on with shipping tape or an in dustrial stapler The carton test strength for this instrument is 200 pounds per square inch English 2 5 Chapitre 2 DM 501A INSTRUCTIONS D UTILISATION Instructions d installation et de d montage V rifier que les d trompeurs situ s sur le connecteur du ch ssis d alimentation choisi s adaptent aux encoches situ es sur le connecteur arri re du circuit imprim du DM 507A L insertion du tiroir ne peut se faire qu partir du moment o les d trompeurs sont correctement plac s Aligner ensuite les rainures sup rieure et inf rieure du DM 501A avec les guides du chassis d alimentation voir Fig 2 1 et ins rer fond le tiroir L affichage doit appa ATTENTION raitre d s la mise sous tension Couper l alimentation du ch ssis avant d ins rer ou d extraire le DM 501A des arcs lectriques Le multim tre num rique DM 501A est livr talonn et pr t fonctionner H peut tre utilis dans n importe quel boitier d alimentation de la s rie TM 500 se repor ter au manuel d instructions du ch ssis d alimentation pour toute information relative la mise sous tension de l appareil pourraient se produire au niveau du connecteur Pour extraire le DM 501 tirer le loquet de verrouillage diminuer sa dur e de vie et endommager les cir situ au coin inf rieur gauche jusqu ce que le connec cuits du tiroir teur arri re soit lib r
78. ont panel or rear interface connector pin 28A The output current from the VOLTS Q or rear interface connector varies between 100 yA and 1 mA in decade steps depending on the selected range 100 90 k 1k 900 k 20 k 9M 2 MO 20 MQ o R1516 100 k 200 Q R1515 20 MQ 10 93 k me R1412 500 NOTE Switches shown in 200 Q position 2749 4 A Fig 3 6 Simplified ohms converter diagram 3 4 REV A JAN 1980 Circuit protection tothe ohmmeter functionis provided by posistor RT1102 and clamping diodes CR1516 and CR1518 A voltage source inadvertently applied in the ohmmeter function will cause RT1102 to heat and effec tively open Temperature Measurement Circuitry The temperature circuitry is designed to operate with the P6601 Temperature Probe The temperature sensing element consists of a thin film platinum resistor in the tip of the probe The sensor resistance which is a function of temperature is R Re aT BT where Rais 100 Q a is equal to 0 3738 Q per degree C and is equal to 8 85 x 105 Q C nominal coefficient T is temperature in degrees Celsius A 1 mA current source from transistor Q1731 zener diode VR1636 and related circuitry flows through the temperature probe sensor When the temperature changes the sensor resistance changes which causesthe voltage developed across the sensor to change This voitage is shifted and amplified by the Temperature Amplifier U1737 The output of
79. procedure when perfor The following test equipment or equivalent refer to Table 4 1 is suggested to perform the Performance ming the procedure use only the Display Limits listed for Check and Adjustment Procedure the ambient temperature in which the instrument is operating To check the rear interface accuracy specifications access the rear interface pins 28A LO and 28B HI with a TM 500 series Option 2 power module Instructions and accuracy tables for rear interface performance checks are given following this procedure Table 4 1 LIST OF TEST EQUIPMENT REQUIREMENTS Desctiption Performance Requirements Applications Digital Voltmeter Range 0 to 50 V accuracy Voltage measurement 10 1 Ac Dc Current Source Range 0 to 2 A sine wave Ac Dc ammeter from 20 Hz to 10 kHz accuracy check accuracy 0 06 Range 0 to 2 A de accuracy Example TEKTRONIX TM 503 or TM 504 TEKTRONIX DM 501A OM 502A DM 505 Valhalla Scientific Inc 2500 Ac Dc Current Calibrator 0 02 Dc Voltage Source Range 0 to 1000 V accuracy De voltmeter Fiuke Model 343A or 341A 0 01 accuracy check De Voltage Calibrator Ac Voitage Source Range 0 to 500 V accuracy Ac voltmeter 0 05 20 Hz to 20 kHz Ad accuracy check justable 0 2 Hz at 50 Hz and 60 Hz REV A MAY 1980 Fluke Model 5200A Ac Calibrator and Fluke Model 5215A Power Amplifier Calibration Procedure DM 501A Performanc
80. r for a minimum output voltage g Remove all connections 4 2 2 Check Dc and Ac Common Mode Rejection Ratios a Connect a bnc female to dual banana connector to the VOLTS Q and LOW connectors b Connect a dual binding post with bnc male connec tor to ihe bnc female connector of the dual banana connector c Connect a 1 kQ resistor between the binding posts d Connect the red lead of a clip lead adapter to femaie bnc connector to the red binding post one side of the resistor e Connect theblacklead of the cliplead adapter tothe ground binding post of the DM SOTA f Connect thebncfemale connector through a coaxial cable to the dc voltage calibrator g Press the VOLTS DC function push button h Press the 200 mV range push button i Set the dc voltage calibrator for 10 00 V output j Check the display for a reading of lt 00 13 k Move the red lead of the clip lead adapter to black binding post and repeat part j 1 Replace the dc voltage calibrator with an ac voltage calibrator m Set the ac calibrator for a 10 V ac rms output at either 50 or 60 Hz 0 2 Hz n Check the display for a reading of 01 44 o Press the VOLTS AC TRUE RMS function push button p Check the display for a reading of lt 14 33 q Movetherediead of the cliplead adapter back tothe side of the resistor connected to the red binding post r Check as per part p s Press the VOLTS DC function push button t
81. s 60 minutes after storage in high humidity environment REV B JAN 1980 1 9 Specification DM 501A Table 1 3 ENVIRONMENTAL Characteristics Description Se EE Temperature Operating Non operating Humidity Altitude Operating Non operating Vibration Shock Bench Handling Operating E M C Operating Electrical Discharge Operating Transportation Vibration Package Drop See Tabie 1 4 tor system modifiers With power module Without power module 0 C to 50 C Meets or exceeds MIL T 288008 class 5 with exceptions 99 Gto 750 95 to 100 for 5 days Meets or exceeds MIL T 28800B class 5 derated above 25 C 4 6 km 15 000 tt Meets or exceeds MIL T 28800B class 3 15 km 50 000 tt 0 64 mm 0 025 disp Meets or exceeds MIL T 288008 class 3 5 55 5 Hz sine wave 75 min total 30 g s half sine Meets or exceeds MIL T 288008 class 3 11 ms 18 shocks 45 or 4 or equilibrium Meets or exceeds MIL T 28800B class 3 whichever occurs first 30 Hz to 1 GHz Meets or exceeds MIL T 28800B class 3 20 kV max No MIL T 28800 equivalent Charge applied to each protruding area of the front panel except the input connectors 25 mm 1 inch at 270 rpm National Safe Transit Association for 1 hr Preshipment Test Procedures project 1A B 1 and 1A B 2 10 drops from 3 ft 91 cm Temperature During low temperature test MIL T 28800B paragraph 4
82. sation The 500 Vac compensation consists of C1126 C1129 500 Vac and C1124 The attenuated signal passes through switches S1 F and S1 D pin 3 and posistor RT1633 to the input of the AC Buffer U1539 Simultaneously the other half of switch S1 D pin S couplesthe output ofthe dB Converter 01429 through switch sections S3 and S1 to the Analog Converter pin 15 The posistor RT1633 with diodes CR1631 and CR1632 protect U1539 from input voltage overloads REA an SOSHGS occurs diodes CRI and Chiesa clamp the signal at 0 7 V above or below the power supply voltage causing RT1633 to heat When reaching the trigger Temperature RT1633 will effectively open or achieve a very high resistance thus limiting the input current to U1539 CURRENT SHUNTS dB Input Circuitry in the 200 mVac range position switch S2 C activates relay K1528 which sets the AC Buffer U1539 for X10 gain Resistor R1539 and U1539 feedback resistor R1538 comprise the X1 and X10 gain setting network The output of U1539 pin 6 is coupled through capacitor C1539 and R1537 2 Vac GAIN to the input of U1429 pin 1 The dB Converter U1429 computes the rms level of the input ac signal and outputs the equivalent dc level on pin 8 This output signal Hi is appropriately switch coupled through resistor R1613 located on diagram 2 to the Anaiog Converter U1601 pin 15 The dB Converter U1429 also converts the ac signal input pin 1 to a dc vo
83. ssige Wert im Display 16 2 dBm oder 4 14 dBV aufgrund der maximal zul s sigen Wechselspannung von 500 V Bei Lieferung des DM 501A betr gt die 0 dB Referenz 1 mW an 600 Q 0 7746 V Eine Umstellung auf 0 dB bei 1 Vist durch eine interne Br cke m glich siehe hierzu die Kalibrieran weisung WARNUNG Die Umstellung sollte nur von geschuitem Personal durchgef hrt werden F r Wechselstrommessungen ist die Drucktaste mA und eine entsprechende Bereichstaste zu bet tigen Der zu messende Strom ist ber die Eingangsbuchsen mA und LOW zu f hren Die Wechselstrommessungen erfolgen mit Hilfe eines Wechselstrom Echteffektiv Gleichspannungskon verters Widerstandsmessungen Bet tigen Sie die Drucktaste kQ und eine entsprechende Bereichstaste Dann w hien Sie entsprechend der maximal gew nschten MeBspannung die Drucktasten Hl oder LO siehe Tabelle 2 1 Der Vorteil des Hi Betriebes ist die Unempfindlichkeit gegen St rspannungen wie sie z B durch Thermoelementbildung bei ungleichen Me tallen entstehen k nnen Beim LO Betrieb liegt die MeB spannung unterhalb der Schwellspannung von Silizium halbleitern so da ohne Einflu innerhalb haibleiterbe st ckter Schaltungen gemessen werden kann im Widerstandsme betrieb liefern die Eingangsbuchsen LOW und VOLTS Q konstanten Strom mit Stromrichtung von der VOLTS Q Buchse in die LOW Buchse In Tabelle 2 1 sind die Strom und Spannungswerte an den Ein gangsbuchsen bei Berei
84. st DANGER GEFAHR weist darauf hin da durch zuf lliges Ber hren an einer zug nglichen Stelle Personenschaden ntstehen kann SYMBOLE In diesem Handbuch A Dieses Symbol zeigt an wo Vorsicht walten zu lassen ist oder wo Informationen zu finden sind Markierungen auf dem Ger t 4 GEFAHR Hochspannung Schutzerdungskontakt gt A ACHTUNG beziehen Sie sich auf das Handbuch Masseanschlu des Ger tes Dieses Ger t wird ber den Schutzleiter der Versorgungseinheit mit Erdpotential verbunden Zur Vermeidung von elektrischen Schl gen ist vor der Beschaltung der Ein und Ausg nge der Netz stecker in eine korrekt verdrahtete Steckdose einzustecken Verwenden Sie den Schutzleiter nicht als einzige Verbindung zwischen zwei oder mehreren Ger ten Zur Vermeidung von elektrischen Schl gen sind die Ger te untereinander mit separaten Leitungen zu verbinden x REV A AUG 1980 DM 501A Verwendung eines richtigen Netzkabels _ Verwenden Sie nur Netzkabel die f r die Versorgungseinheit geeignet sind und die sich in gutem Zustand befinden F r detaillierte informationen ber Kabel und Stecker beziehen Sie sich auf Abbildungen innerhalb des Handbuches Ein Austausch von Kabeln und Steckern ist nur von geschultem Personal vorzunehmen Verwendung einer richtigen Sicherung Zur Vermeidung von Brandsch den sind nur Sicherungen zu verwenden die in den Teilelisten dieses Ger tes aufgef hrt sind und die in Spannungs
85. z 17 9 to 22 1 2 kHz to 10 kHz 19 5 to 20 5 20 Hz to 2 kHz 18 9 to 21 1 20 Hz to 2 kHz 18 5 to 21 5 2 kHz to 10 kHz 17 9 to 22 1 2 kHz to 10 kHz 19 5 to 20 5 18 9 to 21 1 19 5 to 20 5 When a 2 is displayed the DM 501A overranges flashing display and illuminates onty the upper segment of the 1 in the most significant digit 4 6 REV A JAN 1980 Range 200 Q 2 kQ 20 KQ 200 kQ 2000 kQ 20 MQ Range 200 uA 2 mA 20 mA 200 mA 2000 mA REV A JAN 1980 Calibration Procedure DM 501A Performance Check Procedure Table 4 6 FRONT PANEL RESISTANCE ACCURACY DISPLAY LiMITS Ambient Temp Range Ambient Temp Range Resistance 18 C to 28 C 0 C to 18 C 28 C to 50 C EM TNA ee re call Lo 190 00 Q 190 32 to 190 62 to 189 68 189 38 1 9000 kQ 1 9032 to 1 9032 to 1 9062 to 1 9062 to 1 8968 1 8968 1 8938 1 8938 19 032 to 19 032 to 19 062 to 19 062 to 18 968 18 968 18 938 18 938 190 32 to 190 62to 190 62 to 189 68 189 38 189 38 1903 2 to 1906 0 to 1906 2 to 1923 3 to 1896 8 1894 0 1893 8 1876 7 19 000 MA 19 098 to 19 233 to 18 902 18 767 19 000 kQ 190 00 kQ 190 32 to 189 68 1900 0 kQ Table 4 7 FRONT PANEL DC CURRENT ACCURACY DISPLAY LIMITS Ambient Temp Range Ambient Temp Range Current 18 C to 28 C 0 C to 18 C 28 C to 50 C 190 00 yA 190 41 to 189 59 190 62 to 189 38 1 9000 mA 19 000 mA 19

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