Fluke 8502A, Instruction Manual

Page 1: ...dix 7A If your instrument contains assemblies with different revision tetters it will be necessary for you to either update or backdate this manual Refer to the supplemental change errata sheet for ne...

Page 2: ...giving full details of the difficulty and include the model number type number and serial number On receipt of this information service data or shipping instructions will be forwarded to you 2 On rec...

Page 3: ...git instrument employing microprocessor control and a bus structure Memory programming either from the front panel or through a remote interface permits a number of operations to be performed on the m...

Page 4: ...stalled simultaneously 2 Only one of Options 05 06 and 07 can be installed at any time 3 For die AC portion of Option 03 to operate either Option 01 or 09A must be installed 4 Option 08A must be insta...

Page 5: ...trument 12 watts 1 15V ac or 230V ac 10 Fully Loaded 24 watts 50 60 Hz WARM UP 1 hour to rated accuracy SHOCK AND VIBRATION Meets requirements of MIL T 28800 for Class 5 style E equipment Note The sta...

Page 6: ...f Input 30 000V 15V to Ext Ref HI 15V to Ext Ref LO A 001 1 Digit B 001 1 Digit Ratio Accuracy A B 10 ppm 001 1 Digit 001 1 Digit 001 CK 3 2 Digits Reading may be between 3 0003 and 2 9997 2 Input 1 2...

Page 7: ...l pushbutton auto zero is provided The zero correction is stored in memory until power is interrupted or the 8502A is RESET If calibration memory Option 04 is installed the zero correction is retained...

Page 8: ...s dc volts Ext Ref Input Line frequency and 2x line frequen cy 75 dB Settling Time Sense Input Fast Filter 50 ms to 0 001 of change Sense Input Slow Filter 500 ms to 0 001 of change Digitizing Time NO...

Page 9: ...problem 2 Learning the guidelines for handling them 3 Using the procedures and packaging and bench techniques that are recommended The Static Sensitive S S devices are identified in the Fluke technic...

Page 10: ...LD BE USED 10 ONLY GROUNDED TIP SOLDERING IRONS SHOULD BE USED Anti static bags for storing S S devices or pcbs with these devices on them can be ordered from the John Fluke Mfg Co Inc See section 5 i...

Page 11: ...tandard 19 inch equipment racks Information regarding installation or rack mounting accessories Is contained in Section 6 2 8 The 8502A operates from either 115V ac 10 or 230V ac 10 50 or 60 Hz 10 tol...

Page 12: ...de the exponent display will be used as an extra digit for 6 1 2 digits 2 Exponent Display Displays polarity and value of exponent for engineering notation 3 Range and Function indicators LED s illumi...

Page 13: ...se Use AGC 1 5A 10 MODIFIER Controls RESET 11 Status Display RESUME REMOTE EXT REF FILTER SAMPLE Numerics LED s light for 12 Power Switch Slow filter Sample flashes at reading rate SCALING selected RE...

Page 14: ...ble meanings Error codes will not be displayed in Cal mode Random readings will then be the only indic ation of an invalid fiinction or faulty module Table 2 2 Error Codes CODES FAULT Error System err...

Page 15: ...h INPUT HI terminals may be left strapped together The INPUT LO terminals may likewise remain strapped For most mea surements it is sufficient to strap GUARD to INPUT LO Refer to Figure 2 2 for recomm...

Page 16: ...ypass 4 F2 slow filter with time out 550 msec settling time FILTER LED on 5 F3 fast filter with time out 50 msec settling time Fast and slow refer to the respective filter s settling time 2 41 The slo...

Page 17: ...alues stored as references the 8502A toggled into the limits mode will yield a display of 1 HI if the reading is greater than the high limit 2 PASS if the reading is less than or equal to the high lim...

Page 18: ...ed at a time A function change will deactivate the Scaling mode but retain the stored factor NOTE If the 8502A is in both Scaling and Offset the scaling factor will be applied first the scaled display...

Page 19: ...HMS Depress the switch for the desired function The 8502A will assume autoranging AUTO LED on and retain any modifier sample filter etc or memory scaling offset etc mode already In use if a function i...

Page 20: ...ange the range DOWN Steps 8502A to the next lower range each time it is depressed DOWN will have no effect at the bottom of the range AUTO Toggles the 8502A into out of the Autoranging mode HIGH RESOL...

Page 21: ...FILTER The mode will be displayed as long as FILTER is held depressed 4 If modes FI or F3 are in effect subsequent use of FILTER will tt gle the 8502A back to mode F If mode F2 is in effect pressing F...

Page 22: ...nual or Externa Triggering modes RESET Use RESET to put the 8502A back to the power on status 1 V DC function 2 1000V range FO filter 4 7 sample 5 No other modifiers or memory modes in effect Memory e...

Page 23: ...LO The value t ing entered will be displayed as long as HI or LO are held depressed Release of eiliier switch will enter the value as the respective limit LIMIT must be separately depressed before or...

Page 24: ...VDC OHM ZERO The value will be displayed as long as VDC OHM ZERO is held depressed OFFSET Enter the Offset mode by pressing OFFSET OFFSET LED will come on Exit diis mode by again depressing OFFSET St...

Page 25: ...each range and function the optional Calibration Memory must be installed Refer to Section 6 for applicable operating instructions TRIGGER 1 Press TRIGGER to activate both manual triggering mode and e...

Page 26: ...lude staying in the entry sequence exiting the sequence and retaining memory or exiting the sequence and losing memory Stay in sequence CE erases only numbers before entry Exit sequence retain memory...

Page 27: ...then display Go Start entries again from this point a For Filter enter the mode number 0 1 2 or 3 b For Sample enter the exponent of 2 for samples averaged in each reading 0 through 17 c For Offset e...

Page 28: ...installed Option 01 or 09A 2 Select the VAC function 3 The 8502A will go to autoranging manual ranging can be selected if necessary There are four avail able ranges lOOOV lOOV lOV IV 5 6 The slow fil...

Page 29: ...lications presented in Table 2 3 presuppose described below 10 ohm range only an initial power on or reset instrument status i e 5 Select desired modifiers and memory operations 1 V DC function 6 Conn...

Page 30: ...s a scaling factor Press STORE SCALING SCALING Initial use of SCALING places the displayed value which is seen as long as the switch is held depressed into memory The second use of SCALING places the...

Page 31: ...equal the deviation from 20V APPLICATIONS REQUIREMENT Make a series of measurements in a noisy environment Speed of measurement is not important Display only the deviation in volts METHOD Allow for ex...

Page 32: ...ON 7 REQUIREMENT Determine the highest and iowest readings encountered in measuring a group of 28V power supplies METHOD Press PEAK to record measurement extremes When required measurements are comple...

Page 33: ...ock diagram of the instrument with optional modules drawn in dashed lines Figure 3 2 is a block diagram illustrating signal flow A microprocessor based controller module controls information flow on t...

Page 34: ...onnecting the input switch Sense HI and ID source HI and LO Guard Ohms Guard to the signal conditioning and con verting modules AC converters Ohms converter etc Ohms guard is only available through th...

Page 35: ...to an appropriate lime in the microprocessor cycle through interrupt control where assigned priorities vector module identity data onto the data bus Module identity data words direct the micro proces...

Page 36: ...Y TAKE AUXILIARY PERFORM OHMS OHMS VOLTAGES CALCULATION RANGER NO MULTIPLY READING BY CAL CORRECTION TAKE READING DIVIDE ACCUMULATED AT X REF INPUTS READING BY X REF OFFSET CONVERT ACCUMULATED READING...

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Page 38: ...signal conditioners Ohms or Current Shunts are routed through the DC Signal Condilioner to be brought v ithiri the range of the A D Converter 20V Figure 3 6 is a block diagram of the DC Signal Condit...

Page 39: ...current is switched off If not it is left on I hen the next current is switched into the Summing Node and another polarity bit returned Another decision is made and so on until all five currents have...

Page 40: ...rupt MARK INT 3 38 ADDRESS and DATA BUSSES 3 39 Sixteen address lines are used for addressing mem ory locations and external modules Refer to the Controller schematic in Section 8 Internal scratch pa...

Page 41: ...or to enter a wait state by pulling the ready RDY line low Figure 3 12 Set Ready SRDY normally high is pulled low to exit the wait state Reset ready RRDY normally low goes high to enter the wait state...

Page 42: ...nterrupt INT control logic Figure 3 13 A low on OR gate U17 places a high on NAND gate U38 When INTE is high from the microproces sor during the last state of an Instruction cycle U38 out puts a low t...

Page 43: ...US LATCH MEM RD memory read is disabled by DBIN from the microprocessor and MEMR from the ST TUS LATCH both being low After ARM MARK Ul 7 is docked high the next pulse from the phase locked loop timin...

Page 44: ...ion of the input Figure 3 16 If both relays are energized the input is from the Volt n input terminals with 64 attenuation If just Kl is energized the input is from the Volt fi input terminals with no...

Page 45: ...8502 fi 3 n Figure 3 15 Front Panel...

Page 46: ...V OUT 8502A RELAY DRIVER...

Page 47: ...FILTER BYPASS 8502A Figure 3 17 Filter Externa Reference 3 15...

Page 48: ...and possibly opened again This constitutes a decision period 3 71 Following the decision period is the subtraction period Switch G is opened and switches X and SX are dosed to form a feedback path for...

Page 49: ...7V REFERENCE REFERENCE SWITCH 8502A...

Page 50: ...on the input of one section of AND gate U25 Through OR gate U16 a one will be applied to the D input of that switch latch The next transition of U31 will clock the hitch keeping the switch closed If t...