Tektronix 502A User's Manual
Contents
1. Specification DM 502A Tabie 1 2 cont Characteristics Performance Requirements Suppiementai Information Usable from 20 kHz to 100 kHz 200 mV to 200 V ranges Typically lt 5 of reading 0 3 of full scale 500 V range Typically 5 of reading 1 2 of full scale Common Mode Rejection Ratio 60 dB at 60 Hz Verified with 1 kN unbalance in series with the LOW terminal Response Time lt 1 second within any range Add 1 5 seconds for each range change in the AUTO mode Input Impedance 10 MQ 0 5 paralleled by lt 60 pF Input Terminals Front panel EXT or rear inter face INT Switch selectable Maximum Input Voltage Front Pane Terminals VOLTS Q to LOW 500 Vrms notto exceed 1 kV peak VOLTS Q to Ground 500 Vrms not to exceed 1 kV peak LOW to Ground 500 Vrms not to exceed 1 kV peak ieee zz Pin 28B to Pin 28A Not to exceed 200 V peak Pin 28B to Ground Not to exceed 200 V peak Pin 28A to Ground Not to exceed 200 V peak Crest Factor O See 4 at full scale on all ranges na except 500 V lt 2 on 500 V i range Table 1 3 DECIBELS dB TRUE RMS ida cards ita a r RERER Characteristics Performance Requirements Suppiemental Information Accuracy for 10 dB 10 dB 30 dB and 50 dB ranges Front Panel and Rear Interface Automatic or manual ranging Front panel shows maximum range value with 40 dB be2. Maximum Open Grau vete 2 nn u Specification DM 502A Table 1 5 DC AMMETER Perforr Characteristics Accuracy for 200 pA 2 mA 20 mA 200 mA and 2000 mA ranges ce Requirements Front Panel only 18 C to 28 C 0 C to 18 C 28 C to 50 C Response Time Maximum Open Circuit Input Voltage 0 2 of reading 0 05 of full scale 0 3 of reading T 0 1 of full scale mA to LOW terminals Maximum input Current 250 V peak 2 A o on any range Input Terminals Front panel input only Input Resistance Range Resistance _ 200 pA 1 KO 2 mA 100 Q 20 mA 10 20 200 MA 129 nia 2000 mA 040 Maximum Floating Voltage z mA terminal to Ground 1000 V peak LOW terminal to Ground 1000 V peak Table 1 6 AC AMMETER TRUE RMS lemental information Characteristics Performance Requiremen is PI AAA A TA Accuracy for 200 yA 2 mA 20 mA 200 mA i Manual ranging only and 2000 mA ranges Front Panel 40 to 10 kHz Sine wave 18 C to 28 C 000 of reading 0 3 of full scale Useable to 20 kHz 0 C to 18 C 28 C to 50 C it 0 7 of reading 0 5 of full scale nn nn nn nennen Response Time lt 1 second Maximum Open Circuit Input Voltage mA to LOW terminals Maximum Input Current input Terminals input Resistance Same
3. COMMITTED TO EXCELLENCE MANUAL TION gt Tektronix inc P O Box 500 Serial Number 97077 Beaverton Oregon First Printing FEB 1979 070 2693 00 SH ER S VAR E EIS AN tees Wasser RX t TY Je RER SS RAS DM 502A OPERATORS SAFETY SUMMARY The general safety information in this part of the 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 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 ora hazard to property including the equipment itself DANGER indicates a persona injury hazard immediately accessible as one reads the marking SYMBOLS in This Manual This symbol indicates where applicable cautionary or other information is to be found As Marked on Equipment h DANGER High voltage amp Protective ground earth terminal IN ATTENTION refer to manual Power Source This product is intended to operate in a power module connected to a power sour
4. The maximum input voltage is 1 kV peak at the front panel connectors and 200 V peak at the rear inter face connectors The front panel VOLTS Q and LOW connectors may be floated 1 kV maximum above ground the rear input connectors 200 V 69 TEMP C Select temperature readout in C A Use in conjunction with LOW terminal for current measurements mA LOW Common terminal for ali inputs except temperature TEMP Connect temperature probe to this terminal Ground Terminal Chassis ground VOLTS O IN Use in conjunction with LOW terminal for voltage and resistance measurements AUTO 20 MQ Selects automatic ranging for dc and ac voltage dB and resistance The 20 MQ range is available only in the automatic mode Range Select Pushbuttons Press these buttons to select the desired mea surement ranges Operating Instructions DM 502A vo filer pare Front panel controls and connectors 2 2 i F 2 3 Operating Instructions DM 502A input Connections if the INPUT button is pressed signal inputs are made via the rear interface connector INT if the button is out signal inputs are made via the front panel connector EXD CAUTION N The maximum input voltage is 1 kV peak at the front panel connectors and 200 V peak at the rear inter face connectors The front panel VOLTS N and LOW connectors may be floated 1 kV maximum above ground the r
5. received It operates in any compartment of a TM 500 series power module See the power module instruction manual for line voltage requirements and power moduie operation Figure 2 1 shows the DM 502A installation and removal procedure CAUTION Turn the power module off before inserting the DM 502A Otherwise arcing may occur at the rear interface connectors reducing their useful life and damage may be done to the plug in circuitry Before installing the DM 502A in the power module make certain that the internal jumper is set for the desired dB mode of operation dBm of dBV Refer the setting of this jumper to qualified personnel POWER Barrier Check to see that the plastic barriers on the inter connecting jack of the selected power module compart ment match the cutoutsinthe DM 502A circuit board edge connector Align the DM 502A chassis with the upper and lower guides of the selected compartment Press the DM 502A in and firmly seat the circuit board in the interconnecting jack To remove the DM 502A pull the release latch located in the lower left corner until the interconnecting jack disengages and the DM 502A slides out Check that the DM 502A is fully inserted in the power module Pull the power switch on the power module One or more characters in the LED display should now be visible Top Groove PLUG IN Bottom Groove 2693 2 Fig 2 1 installation and removal 2 1 Operating Instru
6. Temperature Operating 0 C to 50 C Test to MIL T 28800B class 5 with Nonoperating 55 C to 75 C i exceptions Rel ie ri sie CR a er ee ae Humidity j Operating 30 C and 50 C to 90 5 0 Test to MIL T 28800B class 5 Nonoperating 30 C to 60 C to 90 5 0 Altitude Operating 4 5 km 15 000 ft Test to MIL T 28800B class 3 Nonoperating 15 km 50 000 ft Vibration Operating 0 64 mm 0 025 disp 5 55 5 Hz Test to MIL T 28800B class 3 sine wave 75 min total Shock Nonoperating 50 g s 1 2 sine 11 ms Test to MIL T 288008 class 3 18 shocks Bench Handling Operating 45 or 4 or equilibrium Test to MIL T 28800B class 3 whichever occurs first E M C Operating 30 Hz to 1 GHz Test to MIL T 28800B class 3 Electrical Discharge Operating 20 kV max Charge applied to each protruding area of the product under test except the input terminais No MIL T 28800 equivalent Transportation Qualified under National Transit Association Pre shipment Test Procedures Project 1A B 1 and ci iena AB See Table 1 10 for system modifiers With power module Without power module Tem perature During low temperature test MIL T 288008 paragraph 4 5 5 1 3 b for class 5 steps 4 and 5 shall be performed before step 2 Also the instrument shall not be operating during step 6 paragraph 4 5 5 1 3 e class 5 While operating condensed moisture shail not be
7. as for dc ammeter redditi art asus tiri TE Te IMMA Tso Maximum Floating Voltage mA terminal to Ground 1000 V peak LOW terminal to Ground 2a 1000 V peak _ Specification DM 5024 Table 1 7 TEMPERATURE Reading Rate Over Range Indication iti Warm up Time III N WR DAREI iodio aisi gs ue Characteristics Performance A Supplemental information Accuracy for the 55 C to 200 C range Manta ranging only 418 C to 28 C Ambient P6601 Probe calibrated to 2 5 C from 55 C to 150 C instrument Polo from 150 C to 200 C Any P6601 probe 4 5 G from 55 C to 150 0 8 5 C from 150 C to 200 C 0 C to 18 C 28 C to 50 C Ambient Probe calibrated to instrument 4 G from 55 C to 150 C 5 C from 150 C to 200 C Any probe 6 C from 58 C to 160 C 7 C from 150 C to 200 C role ERA vo cr PX ias Input Terminals Front panel only DI Table 1 8 MISCELLANEOUS Characteristics Description Power Consumption Approximately 8 W o 3 p per second Flashing display except 1000 Vdc and 500 Vac ranges e dit A _ __ _ _ 04 O j 30 minutes 60 minutes after storage in high humidity environment Specification DM 502A ENVIRONMENTAL CHARACTERISTICS Table 1 9 ENVIRONMENTAL Characteristics Description
8. 5 dB EE RN A A A Specification DM 502A Table 1 4 OHMMETER Supplemental Information Characteristics Performance Requirements Automatic or manual ranging Accuracy for 200 9 2 KO 20 kQ 200 kN 2000 kQ and 20 MQ ranges 18 C to 28 C 200 2 to 2000 kM ranges 0 5 of reading 0 05 of full scale 0 2 Q 20 MQ range 1 of reading 0 05 of full scale 200 to 2000 kQ ranges 0 8 of reading 0 1 of full scale 0 2 Q 20 MQ range 1 3 of reading 0 1 of full scale Add 0 5 to the front panel accuracies stated for the 200 N to 2000 kQ ranges Rear Interface lt 1 second within any range Add 1 5 seconds for each range change in the AUTO mode Response Time Input Terminals nidi i iii Maximum Input Volts Front panel EXT or rear inter face INT Switch selectable 130 Vdc or ac rms indefinitely 230 Vdc or ac rms for 1 2 hour 200 V peak ai rear interface Measuring Current and Full Fuli Scale Volts HI OHMS Scale Range Current Voltage 200 Q 1mA 0 2 V 1 mA 2 0 V 20 KQ 1 mA 2 0 V 200 kQ 104A 20V 2000 kQ 1uA 20V 20MQ 174 20 V Full LO OHMS Scale Current Voltage 1mA 02V 1 mA 0 2 V 10 uA 0 2 V 1uA 0 2V 2000kKQ JaA 02V 20MQ tua 20V Maximum Resolution i NE 100 ma e
9. a a plug in extender DM 502A DM 502A Autoranging Digital Multimeter Section 1 DM 5024 SPECIFICATION instrument Description The DM 502A Digital Multimeter measures de and ac voitage and current dBrn dBV resistance and tem perature The ac functions are true rms responding The ranges for dc voltage ac voltage dBm dBV and resistance are automatically or manually selected as desired The current and temperature ranges are manually selected Rear interface connector input is pushbutton selected from the front panel Readout in dBm or dBV is chosen by an internal jumper The unit is shipped with the internal jumper in the dBm position The readout is a 31 2 digit display using seven segment LED The decimai point is automatically positioned depending on the 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 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 502A 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 Items listed in the Performance Requirements column of the Electrical Characteristics are verified by compl
10. ce 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 ofthe grounding conductorinthe power cord is essential for safe operation vii DM 502A viii Grounding the Product When installed in the power module 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 to the product input or output terminals Upon loss of the protective ground connection all accessible conductive parts including knobs and controls that may appear to be insulating can render an electric shock Use the Proper Fuse To avoid fire hazard use only the fuse specified in the parts list for your product and whichis identical in type voltage rating and current rating Refer fuse replacement to qualified service personnel Do Not Operate In Explosive Atmospheres To avoid expiosion do not operate this product in an atmosphere of explosive gases unless it has been specifically certified for such operation Do Not Remove Covers or Paneis To avoid personal injury do not remove the product covers or panels Do not operate the product without the covers and panels properly installed Do Not Operate Without Covers To avoid personal injury do not operate this product without covers or panels installed Do not apply power to the plug in vi
11. ctions DM 502A Controls Connectors and indicators All controls connectors and indicators except for the rear interface connector and the internal jumper used to select readout for the dBm or dBV modes required for operation of the DM 502A are located on the front panel Figure 2 2 provides a brief description of all front panel controls connectors and indicators o Display 3 1 2 digit LED readout with properly positioned decimal point Special scale factors are il luminated by separate LEDs LA illuminated when units are microamperes mV Hluminated when units are millivolts N Hluminated when units are Ohms MQ illuminated when units are megohms VOLTS DC Selects dc voltage ranges VOLTS AC TRUE RMS Selects ac voltage ranges A See Decibel Measurements on page 2 4 dBm dBV dB Selects dB ranges when depressed along with AC VOLTS TRUE RMS Reference dBm or dBV is internally selectable kQ Selects resistance measuring ranges Hi LO Button in selects full scale voltage as 0 2 in all ranges except 20 MQ which is 2 V Button out selects full scale voltage as 2 except in 2000 range which is 0 2 V mA DC Selects de current measuring range AC Selects ac current measuring ranges INPUT EXT INT IN Button out selects front panel input button in selects rear interface input for dc and ac volts resistance and current measurements only MANNA NM ASS MSI N CAUTION
12. ear input connectors 200 V Three input jacks provide measurement connections The VOLTS Q and LOW input jacks are normally used for all measurements except current and temperature Nor mal measurement conditions will be with the LOW ter minal ungrounded A connection between the LOW and GND input jack post may be made to reference the input against DM 502A chassis ground Use caution as the LOW terminal is then connected to earth ground through the three wire power cord False readings may be ob tained due to ground loops Making Measurements With the DM 502A properly installed in the power module allow 30 minutes warmup time for operation to specified accuracy Select the desired measurement mode voltage decibels resistance current or temperature Then select the desired measurement range or the automatic AUTO range in all modes except current and temperature When the value of the measurand is unknown use the automatic mode Units of measurement are volts decibels kilohms milliamperes or degrees centigrade unless the appropriate suffix yA microamperes mV millivolts Q Ohms or MQ megohms is illuminated at the right of the display The decimal point is automatically positioned To use the 20 MQ range push the button marked AUTO 20 MQ If the autoranging feature is not desired push the desired measurement range button The measurement units are read the same as in the automatic mode of operation Dc Voltage Mea
13. eting the Performance Check in the Calibration section of this manual Items listed in the Supplemental Information column are not verified in this manual They are either explanatory notes or performance characteristics for which no limits are specified ELECTRICAL CHARACTERISTICS Table 1 1 DC VOLTMETER a LL LO eee o H Characteristics Performance Requiremenis Supplemental Information and 1000 V ranges Front Panel and Rear Interface 18 C to 28 C 200 mV to 200 V ranges 1000 V range 0 C to 18 C 28 C to 50 C 200 mV to 200 V ranges 1000 V range Common Mode Rejection Ratio 22100 dB at dc 80 dB at 50 to 60 Hz 0 2 Hz ee _ Normal Mode Rejection Ratio 0 1 of reading 0 05 of full scale 0 1 of reading 0 1 of full scale 0 2 of reading 0 1 of full scale 0 2 of reading 0 2 of full scale 50 dB at 50 or 60 Hz 0 2 Hz Automatic or manual ranging Maximum input for rear interface Maximum input for rear interface is 200 V peak Verified with a 1 kQ unbalance in series with LOW terminal Interna clock frequency must be 20 48 kHz 1 Internai clock frequency must be 20 48 kHz 1 1 1 Specification DM 502A Characteristics Maximum Resolution Step Response Time Input Resistance Input Terminals Maximum input Voltage Front Panel Terminais VOLTS N to LOW VOLTS Q to Ground LOW t
14. he device under test the readings change less rapidly and finally stabilize See the P6601 manual for more information on temperature measurements and probe use Operating Instructions DM 502A Repackaging Information If the Tektronix instrument is to be shipped to a Tektronix Service Center for service or repair attach atag showing the owner with address and the name of an 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 your 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 noless than six inches more than the instrument dimensions Cushion the instrument by tightly packing three inches of dunnage or urethane foam between carton and instrument on all sides Seal the carton with shipping tape or an in dustrial stapler The carton test strength for this instrument is 200 pounds per square inch
15. low dynamic range 0 5 dB from 50 dB to 50 dB from 20 Hz to 20 kHz 0 5 dB from 50 dB to 60 dB from 20 Hz to 2 kHz 1 5 dB from 50 dB to 60 dB from 1 _2 kHz to 20 kHz 18 C to 28 C Specification DM 502A Table 1 3 cont Performance Requirements Supplemental Information 0 C to 18 C 428 C to 750 C 1 1 dB from 50 dB to 50 dB from 20 Hz to 20 kHz E 1 1 dB from 50 dB to 60 dB from 20 Hz to 2 kHz 2 1 dB from 50 dB to 60 dB from 2 kHz to 20 kHz Maximum Resolution 0 1 dB er ASTE a se FE IT Response Time lt second within any range Add 1 5 seconds for each range change in the AUTO mode Input Impedance 10 MQ 0 5 paralieled by lt 60 pF Front panel EXT or rear inter face INT Switch selectable Input Terminals Maximum Input Voltage Front Panel Terminals VOLTS N to LOW 500 Vrms notto exceed 1 kV peak VOLTS Q to Ground 500 Vrms not to exceed 1 kV peak i LOW to Ground 500 Vrms not to exceed 1 kV peak diri SIAT EIA Rear Interface Terminals Pin 28B to Pin 28A Not to exceed 200 V peak Pin 28B to Ground Not to exceed 200 V peak Crest Factor 4 at full scale except lt 2 above Pin 28A to Ground Not to exceed 200 V peak Reference Voltage dBV dBm 0 7746 V 1 mW dissipated in 600 Q Noise Level Typically below 7
16. o ground Rear Interface Terminals Pin 28B to Pin 28A Pin 28B to Ground Pin 28A to Ground Characteristics Accuracy for 200 mV 2 V 20 V 200 V and 500 V ranges Front Panel o 18 C to 28 C 200 mV to 200 V ranges 20 Hz to 40 Hz 40 Hz to 20 kHz 500 V range 20 Hz to 40 Hz 40 Hz to 20 kHz 0 C to 18 C 28 C to 50 C 200 mV to 200 V ranges 20 Hz to 40 Hz 40 Hz to 20 kHz 500 V range 20 Hz to 40 Hz 40 Hz to 20 kHz Rear interface Table 1 1 cont Pertormance Requirements Supplemental information TRATTA eresie eee NNN MT A direte att lt 1 second within any range Add 1 5 seconds for each range change in the AUTO mode 10 MQ 0 5 Front panel EXT or rear inter face INT Switch selectable 1000 V peak 1000 V peak 1000 V peak 200 V peak 200 V peak 200 V peak Table 1 2 AC VOLTMETER TRUE RMS _ Supplemental information Automatic or manual ranging Performance Requirements 1 5 of reading 0 3 of full scale 0 6 of reading 0 3 of full scale 1 5 of reading 1 2 of full scale 0 6 of reading 1 2 of full scale ili ide alii 1 8 of reading 0 35 of full scale 0 8 of reading 0 35 of full scale 1 8 of reading 1 4 of full scale i 0 8 of reading 1 4 of full scale Maximum rear interface input is 200 V peak increase above percent of reading tol erances by 0 5
17. present on class 5 instruments Drying of the instrument for this class may be performed in a suitable chamber if necessary Characteristics Temperature Operating Nonoperating Humidity Operating Nonoperating Altitude Operating Nonoperating E TRO NIRA A e Specification DM 502A Table 1 10 TM 500 SYSTEMS ENVIRONMENTAL SPECIFICATIONS TM 501 TM 503 TM 504 TM 506 TM 515 i Meets same test standards as plug in Meets same test standards as piug in Vibration Operating 0 26 mm 0 010 in disp 10 55 Hz sine wave 75 min total 0 38 mm 0 015 in disp 10 55 Hz sine wave 75 min Shock Operating Bench Handling Operating 20 g s 1 2 sine 11 ms 18 shocks 30g s 1 2 sine na ER Li ms 18 shocks Meets same test standards as plug in Electric Discharge Operating Meets same test standards as plug in Transportation Vibration Package Drop Meets same test standards as plug in Table 1 11 Characteristics Finish Net Weight Overali Dimensions Anodized aluminim panel and chassis 2 5 lbs 1 13 kg 2 633 in 66 8 mm W x 11 240 in 285 3 mm D x 4 961 in 125 9 mm H 1 9 Section 2 DM 502A OPERATING INSTRUCTIONS Installation and Removal The DM 502A is calibrated and ready for use when
18. surements Press the VOLTS DC pushbutton and AUTO or the desired measurement range button Apply the voltage to be measured to the VOLTS Q and LOW connectors Observe the maximum voltage ratings The readout displays a if the VOLTS Q input is positive with respect to the LOW input A is displayed ifthe LOW input is more positive With the input shorted the display reads zero one count 2 4 Ac Voltage Measurements Press the VOLTS AC TRUE RMS and AUTO or the desired measurement range button Apply the voltage to be measured to the VOLTS Q and LOW connectors Observe the maximum input voltage ratings Decibel Measurements IN Press the VOLTS AC TRUE RMS dB and AUTO or the desired measurement range pushbutton The DM 502A will read directly in dBm or dBV depending onthe position of the internal jumper This jumper is located on the main board in the upper rear quadrant and is numbered P1517 WARNING j Refer jumper change to qualified personnel The formula for calculating dB from voltage is E dB 20 10910 Ei When the DM 502A is set for dBV 1 V is the reference voltage Ei in the formula and the instrument calculates and displays the dBV value When the jumper is set for dBm the reference voltage is 0 7746 V the equivalent of 1 mW dissipated in 600 N The unknown voltage is E Resistance Measurements Connect the resistance to be measured tothe VOLTS Q and LOW input terminals Select the maximum resis
19. tance measuring range desired by pressing the appropriate pushbutton or the AUTO pushbutton if automatic ranging is desired Press the kQ and the HI or LO pushbutton depending on the voltage desired at the measurement terminals The voltage at the measurement terminals with the LO pushbutton pressed is 0 2 V in ali ranges except 20 MQ which is 2 0 V With the HI pushbutton pressed the voltage is 2 0 Vin all ranges except 200 which is 0 2 V Use the LO ranges lower voltage for incircuit resistance measurements where diode junctions might be forward biased with the higher voltages Current Measurements Connect the ac or dc current to be measured tothe mA and LOW input connections Observe the maximum voltage ratings Press the mA DC or AC pushbuttons and the current range desired The DM 502A does not auto range in the current modes Temperature Measurements _ Connect the P6601 temperature probe to the front panel TEMP connector Use care to align the connector pins Press the TEMP C button For best accuracy calibrate the individual instrument to the probe used Apply the probe sensor tip to the device being measured For optimum temperature transfer coat the surface of the device being measured with silicone grease and appiy the probe tip squarely to the surface Allow sufficient time for the probe tip to stabilize before taking a reading The time required depends on several factors Generally when the tip is first applied to t
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