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IET Labs, Inc. RLC Digibridge 1693, User And Service Manual, Page: 144 / 171

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IET Labs, Inc. RLC Digibridge 1693 User And Service Manual Download Page 144

120

1693 RLC Digibridge

Service and Maintenance 

6.  Fasten the bnc connector bracket in the rear 

position and the blank bracket in the front 

position.

7.  Reassemble the instrument and verify nor-

mal operation. To relocate the bnc connec-

tor bracket to the front again, reverse this 

procedure.

5.5.2  Major internal components

The following figures show the major internal com-

poenents of the 1693 Digibridges.

Figure 5-3:  Analog and Control Board Assembly (1689-4702)

Figure 5-4:  Display Board Assembly (1689-4705)

Summary of Contents for RLC Digibridge 1693

Page 1: ...516 334 5959 800 899 8438 FAX 516 334 5988 www ietlabs com 534 Main Street Westbury NY 11590 IET LABS INC Copyright 2012 IET Labs Inc Visit www ietlabs com for manual revision updates 1693 im Septemb...

Page 2: ...TEL 516 334 5959 800 899 8438 FAX 516 334 5988 534 Main Street Westbury NY 11590 IET LABS INC www ietlabs com Standards Decades Strobes Sound Level Meters Bridges...

Page 3: ...T replaced at no charge when returned to IET Changes in this product not approved by IET or application of voltages or currents greater than those allowed by the specifications shall void this warrant...

Page 4: ...AGES 45 V ARE USED TAKE ALL MEASURES TO AVOID ACCIDENTAL CONTACT WITH ANY LIVE COMPONENTS USE MAXIMUM INSULATION AND MINIMIZE THE USE OF BARE CONDUCTORS WHEN USING THIS INSTRUMENT Use extreme caution...

Page 5: ...2 1 2 2 References 2 1 3 Controls Indicators and Connectors 2 1 4 Accessories 6 1 4 1 Supplied accessories 6 1 4 2 Optional Accessories 6 Chapter 2 Installation 2 1 Unpacking and Inspection 8 2 2 Dime...

Page 6: ...Connection to HACS Z High Accuracy Decade Capacitor 25 3 2 11 Connection to 1482 Inductance Standard 27 3 2 12 Connection to 1409 Capacitance Standards 28 3 2 13 Connection to 1404 Reference Standard...

Page 7: ...cy 54 3 6 4 Selection of Median Value for Better Accuracy 55 3 6 5 Accuracy Enhancement for Large or Small Impedances at Particular Frequencies 55 3 6 6 Accuracy Enhancement by Special Attention to Sh...

Page 8: ...488 2 SCPI Digibridge Command Reference 80 3 11 11 Example Programming 91 3 11 12 Talk Only Use for Data Output 91 3 11 13 Talk Listen Use for Remote Programming and Data Transfers 94 3 11 14 Data Out...

Page 9: ...ponents 120 5 5 3 Interface Options 121 5 5 4 Removal of Multiple Pin Packages 122 5 6 Periodic Maintenance 122 5 6 1 Care of Test Fixtures 122 5 6 2 Care of the Display Panel 122 5 7 Trouble Analysis...

Page 10: ...emote test fixture and the Extender cable to RLC Digibrige 20 Figure 3 12 1689 9602 Extender Cable with bnc to banana plug adapters 21 Figure 3 13 7000 05 Chip Component Tweezers 22 Figure 3 14 1700 0...

Page 11: ...timing source 108 Figure 4 4 Sine wave generator 108 Figure 5 1 Screws holding the interface assembly on the rear panel 117 Figure 5 2 Interior top view of 1693 Digibridge 118 Figure 5 3 Analog and Co...

Page 12: ...x Table of Contents 1693 RLC Digibridge This page is intentionally left blank...

Page 13: ...s with the required rated current voltage and specified type normal blow time delay etc should be used Do not use repaired fuses or short circuited fuse holders Using the wrong fuse could cause a shoc...

Page 14: ...ted to the ground wire before operating the equipment Material Contents Declaration A regulatory requirement of The United States of America defined by specification SJ T 11364 2006 mandates that manu...

Page 15: ...of parameters are measured R and Q C and D L and Q C and R R and X G and B Z magnitude and angle and Y magnitude and angle as selected by the R Q C D L Q or C R keys or the SHIFT key and the R X G B...

Page 16: ...ly from the IEEE bus and the result held until another measurement is started There are three measurement rates selected by single keys SLOW MEDIUM and FAST whose measurement times depend on the test...

Page 17: ...e voltage applied to the device depends on the value of the source resistor Rs and the impedance value of the device As an example where Range 4 is used which has a source impedance Rs of 25 ohms and...

Page 18: ...onstants Ks and Kfv are given in Tables 0 and D Note that for SLOW measurements at 1kHz and 1 V with non constant voltage these K constants are all zero and that f 1 Accuracy of primary parameters lef...

Page 19: ...hm 60 kohm Lmax 160 H 10 H Cmin 160 pF 3 nF Gmin Ymin Bmin 1 uS 15 uS Table C Ks as a Function of Measurement Rate Measurement Rate Slow Medium Fast Maximum Ks 0 3 8 23 Maximum is FAST measurement mod...

Page 20: ...tage 8 5 3 2 1 2 2 4 6 12 25 80 0 1 V to 0 25 V AC Applied Voltage 12 8 6 5 4 5 6 8 10 20 50 100 0 03 V to 0 1 V AC Applied Voltage 35 30 25 20 14 15 15 20 25 40 100 0 01 V to 0 03 V AC Applied Voltag...

Page 21: ...upon power up Self Check diagnostics Self tests are performed during power up to verify proper operation and validity of calibration Coded error signals on the display notify the operator if a problem...

Page 22: ...ard lights indicate MEASURE VALUE SLOW TRIGGERED SERIES If a fault is detected measurements are blocked and an er ror code remains displayed See manual paragraph 3 13 If keyboard lights remain dark ke...

Page 23: ...come first 0 SHIFT BIN NO 0 6 Overlapping values will always get assigned into the lower numbered bin e Press FUNCTION key to select MEASURE mode f Press DISPLAY key as needed to select the desired m...

Page 24: ...xxii 1693 RLC Digibridge Abbreviated Specifications This page is intentionally left blank...

Page 25: ...pen circuit and short circuit conditions in the procedure The Digibridge tester normally autoranges and automati cally identifies the principal measurement parameter The optional test fixture 1689 960...

Page 26: ...shed in keeping with the long life circuitry inside Glass epoxy circuit boards interconnect and support high quality components to assure years of dependable performance Adaptability to any common ac...

Page 27: ...secondary display Indicates if display selection is delta Indicates PPM if Q or D display selection is parts per million 3 QDRXBAng Display Digital display 5 numerals with decimal points and negative...

Page 28: ...E key Indicators CONT TRIGGERED Mode selection CONT continuously repeating measurement TRIGGERED single measurement initiated by START button 13 BIAS ON Indicator LED indicator Indicates that internal...

Page 29: ...nly with the same rating To replace press up on the release tab to remove fuse drawer 5 Side Vent Air passage Ventilation 6 RS 232 Interface RS 232 Interface for updating firmware of IEEE Card Firmwar...

Page 30: ...racy A remote test fixture is available to receive hand inserted components at a distance from the Digibridge 1 4 1 Supplied accessories Extender cable bnc to bnc 1 meter long Power cable Instruction...

Page 31: ...nown make sure that the and ends of the cable are at least 0 75 19 mm apart c Confirm that MEASURE keyboard light is lit d Press MEASURE MODE key to select TRIGGERED mode e Press the following keys 1...

Page 32: ...nsions Width 440 mm 17 3 Height 147 mm 5 8 Depth 377 mm 14 8 2 3 Power Line Connection This instrument uses a standard IEC input module The input fuse is located in the drawer above the input power mo...

Page 33: ...at the test fixture s and 0 labels agree with the bias polarity NOTE In the cable s color code RED is associated with hot leads which have dc voltage negative with respect to ground when bias is used...

Page 34: ...ent results to the active listeners in the system 2 7 2 Signal Identification For a key to signal names functions and pin num bers Further explanation is found in the IEEE 488 2 Standard 2 7 3 Codes a...

Page 35: ...WARNING Shock hazard and static electricity can cause damage Disassembly should be preformed by qualified personnel only Strictly speaking the address includes more S2 determines only the device depen...

Page 36: ...gth of 17 characters for QDR value 17 characters for bin number 10 characters including spaces carriage return and line feed characters Refer to the format tables in Section 3 11 12 for details 2 8 En...

Page 37: ...e instrument is automatically executing a power up routine that includes self checks CAUTION Before the unit is powered up the internal temperature of the Digibridge must be above 0 C Otherwise the in...

Page 38: ...r being lit and two fives confirm the previous step C Press the START button The GO indication disappears D Wait for the GO indicator to be lit again E Remove the short circuit Note For best accuracy...

Page 39: ...tential together and drives together Geometry If is important to maintain the spacing between the leads during the open compensation at exactly the same distance as the spacing is when the banana plug...

Page 40: ...s open compensation is performed to eliminate this additional capacitance Figure 3 4 Open and short measurements with GR874 connectors Short Connection Open Connection 7000 05 Tweezers The small amoun...

Page 41: ...low The RLC display and units indicator show the principal measured value and the basic parameter thus identifying the DUT The QDR display shows the measured Q if the principal units are ohms or henri...

Page 42: ...basic there are many alter natives described later You can select and program for other equivalent circuits types of results displayed test conditions measurement rate and bin sorting etc 3 2 Connecti...

Page 43: ...ent reliable guarded 4 terminal connection to any common radial lead or axial lead component part using adaptors 1657 5995 an axial lead component part The slots in the test fixture accommodate wires...

Page 44: ...o remove each adaptor lift with a gentle tilt left or right never forward or back 3 2 4 1657 9600 Banana Plug Extender Cable The 1657 9600 is a male banana plug extender cable with shielded 4 terminal...

Page 45: ...g mutual inductances between cable shields 3 2 6 The Effects of Cable and Fixture Capacitances It is important to use very low capacitance shielded wire for cables not only for accuracy but also to mi...

Page 46: ...dge open circuit test with the tips held at a spacing equal to that of the component s contact spacing Figure 3 13 7000 05 Chip Component Tweezers For this accessory an additional accuracy for param e...

Page 47: ...OT red IH Drive HCUR red Table 3 2 Digibridge to 1700 03 cable connections Zero the Digibridge as instructed in Section 3 1 3 on page 14 Note that red designates leads that may be hot When bias is app...

Page 48: ...ct 7000 04 cable to the 1693 Digibridge as specified in Table 3 3 On 1693 Bias Polarity Description 7000 04 Cable IL Drive IL black PL Potential PL black PH Potential PH red IH Drive IH red Table 3 3...

Page 49: ...c to banana adapters see Figure 3 17 1657 9600 Extender Cable or 7000 04 Alligator Clip Leads see Figure 3 18 Note that the alligator clips are removed for direct connection to the binding posts Figur...

Page 50: ...maintained to reduce er rors after the zeroing procedure has been performed Figure 3 19 Connection to HACS Z bnc terminals with 1689 9602 cable with 6700 adapters LOW HIGH 0 1 2 3 4 5 6 7 8 9 1 0 HAC...

Page 51: ...to determine the value of DUT Actual Value DUT Known Value of Std Measured Value of Std Measured Value of DUT See Figure 3 22 for the 3 terminal transfer method Ratio measurements of 2 1 made on a 168...

Page 52: ...L Y Z G R D Q ANG B X R Q C R C D L Q PAR DUT Measurement 3 2 12 Connection to 1409 Capacitance Standards Connection to the 1409 Capacitance standard can be accomplished using the 1657 9600 Extender...

Page 53: ...direct compari son method The unknown is simply compared to a standard capacitor of almost equal value that has a NIST calibration and the measured difference is used to obtain the value of the unkno...

Page 54: ...l Open compensation should be performed as normal Short compensation should be performed as follows with cables connected as above with exception of plugging Red White PH lead into Black White PL lead...

Page 55: ...ement on the 1433 HARS with ground strap not connected between LOW and GND The green guard lead is used in this measurement to minimize noise Open and Short compensation should be performed as describ...

Page 56: ...1 M STEPS IH PH IL PL 1689 9602 IL PL PH IH P I P I 1689 9600 REMOTE TEST FIXTURE Formerly made by GenRad WARNING SHOCK HAZARD HIGH VOLTAGE MAY APPEAR ON LEADS AND TERMINALS 1693 RLC DigiBridge TM 20...

Page 57: ...lity Ohms none L Q Ls Q Lp Q Inductance Quality Henries none C D Cs D Cp D Capacitance Dissipation Farads none C R Cs Rs Cp Rp Capacitance Resistance Farads Ohms R X Rs Xs Resistance Reactance Ohms Oh...

Page 58: ...are none known be sure to specify with your results whether they are parallel or series and what the measurement frequency was 3 3 2 1 Suggested Test Conditions Capacitors less than 10 pF Parallel 10...

Page 59: ...t the Digibridge measures the equivalent series components Rs 15 or Cs if you select SERIES EQUIVALENT CIRCUIT It measures the parallel equivalent components Rp Lp or Cp if you select PARALLEL D and Q...

Page 60: ...and The size of the phase angle of an admittance is the same as that of the corresponding impedance but if we use the convention that a positive angle is one in the counterclockwise direction then the...

Page 61: ...situations in which the paral lel equivalent circuit better represents the physical device For small air core inductors the significant loss mechanism is usually ohmic or copper loss in the wire and...

Page 62: ...FUNCTION key and delta with the DISPLAY key Observe that the RLC display will now be in percent not an electrical measurement unit It is the difference of the measured principal value from the nominal...

Page 63: ...factor of 100 For example if the displayed D values of two capacitors are both 0 0001 changing to DQ in PPM might distinguish them by providing a reading of 138 ppm for one and 87 ppm for the other Th...

Page 64: ...r like 10xxx For example if the measured value is 99 985 nF the display is a full 5 digits if the previous measured value display was 12 345 99 984 or 99 999 but the display is rounded off to 099 98 n...

Page 65: ...mall values Otherwise the resolution can be no better than 00001 on the lowest range For example consider the measurement of some inductors with values near 20 nH Because the minimum measured value an...

Page 66: ...nearest available one 1 Select ENTER with the FUNCTION key 2 Enter the desired frequency in kilohertz and press SHIFT FREQUENCY in sequence as follows For example to select 500 Hz press 5 SHIFT FREQUE...

Page 67: ...the low impedance end Normally the smallest voltage across the DUT if its impedance is 6 25 ohms or more will be 20 of the source voltage this is the case for resistors measured at the low end of each...

Page 68: ...lliamps For example to enter 2 mA press 2 SHIFT CONST I To disable Const I press 0 SHIFT CONST I Refer to Table 3 8 for a listing of constant current source values CURRENT RANGE 51 nA 13 1 A 13 2 A 19...

Page 69: ...z display selection bin no measure mode continuous which elimi nates the settling time that is normal with triggered mode no data output via IEEE 488 bus For test frequency 1 kHz the minimum is about...

Page 70: ...ay the speed of the Digibridge makes it reasonable to dis regard the first displayed result which is liable to be in error for several reasons and observe subsequent displays for consistency which ind...

Page 71: ...point control are explained below Basic Ranges The 4 basic ranges are numbered 1 2 3 4 in order of decreasing impedance Each basic range is approximately a factor of 16 wide Refer to Table 3 7 The wo...

Page 72: ...ult appears Therefore at least in some measurement situations maximum measurement speed requires range holding 3 5 7 Range Holding Why Hold Range The most important use of the range holding capability...

Page 73: ...ither or both of these meth ods The time considerations and a brief instruction for selecting each method while in the ENTER FUNCTION are given here Median Value This measurement time is somewhat less...

Page 74: ...tion time depend on the period of the test signal Selection of test frequency near and above 1 kHz has little effect on measurement time particularly if the integration time factor is left at default...

Page 75: ...3 29 Figure 3 29 Relationships of Measurement Time No entry for delay When measure mode is CONTINUOUS settling time is zero No entry for delay When measure mode is TRIGGERED settling time is 7 10 12 m...

Page 76: ...ly paragraph 3 1 3 and the quick acquisition feature is NOT selected These speci fications are valid when autoranging is used or the option range is set and held When a non optimum range is set and he...

Page 77: ...st frequency Operating points are labeled according to the selected measure rate FAST MEDIUM SLOW All of these curves apply to the following conditions R L or C within basic ranges D or Q 1 display is...

Page 78: ...Averaging can be set to any integer up to 255 To select 8 for example select ENTER with the FUNCTION key then press 8 SHIFT AVERAGE Similarly to inhibit averaging select ENTER func tion and press 1 S...

Page 79: ...coupled from electrical equipment through power line to Digibridge circuits or via inductive or capacitive coupling to the DUT itself Such noise pollutes a measurement now and then among a ma jority...

Page 80: ...ically contain a related error less than 10 nH For even smaller error correct inductance measurements by adding 5 nH to the displayed value If measurements are to be made with adaptors axial lead DUT...

Page 81: ...ms can be significant under some circumstances particularly if a long extender cable is used to reach beyond the normal DUT interface Acm common mode accuracy term most significant on range 4 Ald capa...

Page 82: ...high frequency refer to paragraph 3 13 Accuracy Term 1657 9600 Banana 1689 9602 bnc to bnc Units Acmx for 1kHz 00069 Xdut 00034 Xdut of Ls or Cs Acmx for 20kHz 0069 Xdut 0088 Xdut of Ls or Cs Acmr an...

Page 83: ...result and read the second Notice enough of the subsequent results to verify that the DUT has stabilized Use the stable result 6 In the TRIGGERED measure mode each measurement cycle includes the norma...

Page 84: ...bias For best results after removing bias and before making further measurements allow least 2 seconds for in ternal circuit discharge and settling 3 7 2 External Bias If bias is required at some othe...

Page 85: ...rting routine see paragraph 3 7 3 A Select ENTER function B Press 2 SHIFT SPECIAL 3 3 Observe correct polarity when inserting DUT into test fixture Bias POSITIVE polarity is at the LEFT low terminals...

Page 86: ...l other rejects total 15 bins Manually entered limits are normally entered in pairs defining the upper and lower limits of a bin in the form of nominal value and percent above and below that nominal I...

Page 87: ...arisons unless the keyboard is locked rust enter limits as follows This procedure makes use of limit entry keys at the left of the SHIFT key with gray or yellow labels that ap ply only when the select...

Page 88: ...g bin 0 press 9 9 9 9 SHIFT BIN NO 0 0 C For Rp or Q with L closing bin 0 press 0 SHIFT BIN NO 0 0 8 To enable GO NO GO lights after opening at least one bin leave nominal value at any non zero value...

Page 89: ...3 3 SHIFT NOM VALUE 6 Set bin 1 limits 1 3 5 SHIFT BIN No 0 1 7 Set bin 2 limits l SHIFT BIN No 0 2 8 Set bin 3 limits 5 SHIFT BIN No 0 3 9 Set bin 4 limits 7 9 SHIFT BIN No 0 4 10 Close bin 5 if ope...

Page 90: ...ce is immaterial 3 8 6 Notes on Limit Entries in General For additional detail refer to the condensed instruc tions on the reference card under the Digibridge and to the following notes Frequency It i...

Page 91: ...lection is BIN NO the bin assignment will be shown in the left display area 3 8 8 Bin Sum Information If comparison binning is enabled the Digibridge automatically keeps totals of th e number of measu...

Page 92: ...SPLAY key it is easy to obtain both ratio and bin number for each DUT even without using the IEEE 488 interface Example 1 To sort 200 mF capacitors in bins of 5 10 and 20 Displays to be ratios that ca...

Page 93: ...follows Unlocked several keyboard indicators lit Locked NO keyboard indicators lit except possibly MEASURE BIAS ON and or REMOTE CONTROL To lock the keyboard first select MEASURE func tion Then press...

Page 94: ...left bin number right SHIFT FREQUENCY test frequency kHz displayed a t left SHIFT CONST I short circuit current if selected SHIFT VOLTAGE test voltage that is applied behind source resistance SHIFT AV...

Page 95: ...t circuit useful when measuring biased capacitors Both reversing and shorting Quick acquisition meas routine MED and FAST only useful at low frequencies Quick acquisition and shorting MED and FAST onl...

Page 96: ...ke Listener SH1 Source Handshake Talker T5 Talker with normal and talk only modes for systems without a controller switch selectable on the rear panel L4 Listener SR1 Service Request to request servic...

Page 97: ...ches in the OFF position will disable the GPIB interface with all communication possible only via the RS 232 serial interface By convention GPIB Address 0 is normally used by the controller 3 11 5 Jum...

Page 98: ...is nominal value in base units ohms farads or henries For example nominal value can be set to 543 21 pF by the command N543 21E 12 Limits for bins 1 thru 13 are entered using percent ages referred to...

Page 99: ...ta 2 byte D1 Value 2 byte D2 Delta RLC 2 byte D3 Ratio nominal value RLC value 2 byte D4 Ratio RLC value nominal value 2 byte D5 Bin on ratio nominal value RLC value 2 byte D6 Bin on ratio RLC value n...

Page 100: ...eed 2 byte Q0 Signal reversal use for low frequency hum rejection 2 byte Q1 Shorting between measurements used for reducing transient recovery time within measuring circuit when measuring with bias NO...

Page 101: ...ODe Sets the measure mode TRIGgered Triggered T0 CONTinuous Continuous T1 MTRiggered Triggered median value T2 MCONtinuous Continuous median value T3 DISPlay Results to display on the front panel BIN...

Page 102: ...es or disables bin summary output DISable Disable output E0 ENABle Enable output E1 RESet Reset bin summary to 0 E2 Command Parameter s Description Legacy OUTPut Sets the data to output via GPIB RS 23...

Page 103: ...able Mask Register ENABle Reads the Enable Mask Register QUEStionable Reads the Event Register QUEStionable Command Parameter s Description Legacy EVENt Reads the Event Register CONDition Reads the Co...

Page 104: ...elect appropriate parameter key s CONFigure CIRCuit Syntax CONFigure CIRCuit PARallel SERies Description Sets the measurement equivalent circuit Parameter Value Description PARallel Parallel equivalen...

Page 105: ...DISPLAY nominal value CONFigure DISPLay BINRatio Syntax CONFigure DISPLay BINRatio NOMValue VALNominal Description Set Digibridge front panel to display measurement bin on ratio Parameter Value Descr...

Page 106: ...g Factor real value Equivalent legacy command I numeric Equivalent key IT factor in m SHIFT SPECIAL 5 CONFigure FREQuency Syntax CONFigure FREQuency numeric Description Sets the frequency used for mea...

Page 107: ...NORMal Normal routine highest speed REVersal Signal reversal use for low frequency hum rejection SHORting Shorting between measurements used for reducing transient recovery time within measuring circu...

Page 108: ...y bin high limit in Parameter Value Description numeric Real value high limit in Equivalent legacy command Hh Equivalent key none CONFigure BIN LOW Syntax CONFigure BIN LOW numeric Description Set the...

Page 109: ...nt legacy command x0 x1 Equivalent key none SYSTem KEYPad Syntax SYSTem KEYPad ENABle DISable Description Enables or disables the front panel keypad Parameter Value Description ENABle Unlock enable ke...

Page 110: ...be disabled to prevent interference with or slowing down of measurements if using another interface such as the RS 232 serial interface for communicating with the Digibridge instrument Parameter Valu...

Page 111: ...ake NONe XON HARDware MODem Description Set the RS 232 serial interface handshake Parameter Value Description NONe No handshake XON XOn XOff software handshake HARDware Hardware handshake MODem Modem...

Page 112: ...Description Reads the value of the Questionable Status Event Register Query Only Equivalent legacy command none Equivalent key none STATus QUEStionable CONDition Syntax STATus QUEStionable CONDition D...

Page 113: ...Enable Register to specified numeric value ESE reads the current value of the Standard Event Status Enable Register without clearing the register value Parameter Value Description 0 to 255 Numeric val...

Page 114: ...Enable Register SRE reads the current value of the Service Request Enable Register Parameter Value Description 0 to 255 Numeric value range Equivalent legacy command none Equivalent key none STB Synta...

Page 115: ...numbers 5 SHIFT SPECIAL 2 RLC and QDR results 6 SHIFT SPECIAL 2 RLS QDR and bin numbers full data 7 SHIFT SPECIAL 2 No data on PASS Full data on FAIL 8 SHIFT SPECIAL 2 BIN No on PASS full data on FAI...

Page 116: ...licitly provided and this number can be as long as seven characters 16 CR The standard carriage return and line feed characters end of string 17 LF Table 3 21 Data output format for RLC value delta de...

Page 117: ...ed in format field like the QDR display except the zero before the decimal point is explicitly provided and this number can be as long as six characters 16 CR The standard carriage return and line fee...

Page 118: ...TART button if manual start is en abled The displays may be observed then but their content is controlled by the system controller via the IEEE 488 bus Details of test program preparation are beyond t...

Page 119: ...Tot total range of choice See paragraph 2 7 for address changing procedure Decimal equivalent makes DI08 which is in material a zero Logical 1 is low state true logical 0 is high state Digibridge is a...

Page 120: ...age on DI01 DI08 lines is coded and interpreted differently depending on simultaneous state of A1N line true asserted low false high Bytes 3 and 4 can be programmed in a single command to controller b...

Page 121: ...ly in the text that follows NOTE The 8 bits in each byte are 76543210 where 0 is LSB least significant bit The vertical line or space between bytes is for clarity only not present in data The full eig...

Page 122: ...98 1693 RLC Digibridge Operation Table 3 28 Truth table of compacted binary format for output data...

Page 123: ...e next bit 0 25 the next bit 0 125 and each other bit half of the one before it to the 16th bit Therefore the C value is 2 to the 27th power 879044 7 45058 10 to the 9 power 879044 6 54939 10 e 9 fara...

Page 124: ...ommand This will reset all parameters to the known turn on state If P2 is used later in the program it will reset everything including Nominal Value and any Bin Limits that may be set An X command mus...

Page 125: ...6 xxxx The detector scale test failed CPU will loop on failure Switch POWER OFF and ON again If these remedies are ineffective repair service is required 555 D xxxx Asignal strength check failed When...

Page 126: ...nance effect can be expected when large values of inductance are being measured at high frequency In particular if the Digibridge is autoranging this effect can be expected in range 1 under any of the...

Page 127: ...the DUT may be self resonant If so unqualified measurements of appar ent inductance are misleading Try a set of measurements of apparent inductance at sev eral frequencies sufficiently low or high to...

Page 128: ...analog to digital converter Therefore properly cho sen differences between these measurements subtract out fixed offset errors and ratios between them cancel out the value of the common current the sc...

Page 129: ...r example parameters R and Q Land Q C and D or C and R test voltage 005 to 1 275 V equivalent circuit series or parallel test rate SLOW MEDIUM or FAST frequency programmable from 12 Hz to 200 kHz in 5...

Page 130: ...106 1693 RLC Digibridge Theory Figure 4 1 Block diagram of the 1693 RLC Digibridge...

Page 131: ...measurement signal f are derived from the accurate time base signal 4 2 3 Sine Wave Generation Source of the Test Signal Starting with a digital signal at 64 times the selected test frequency the sine...

Page 132: ...108 1693 RLC Digibridge Theory Figure 4 2 Elementary Measurement Circuit Figure 4 3 Frequency and timing source Figure 4 4 Sine wave generator...

Page 133: ...See signal name BIG L on block diagram The detector is then sampling and converting simultaneously for a portion of the dual slope conversion cycle Data Acquisition Time Data acquisition time includes...

Page 134: ...istivity of 30 to 300 kilohms per square is suggested Avoid placing tools or electrical parts on insulators such as books paper rubber pads plastic bags or trays Ground the frame of any line powered e...

Page 135: ...ucts If a malfunction does occur our service engineers are available for technical telephone assistance If the difficulty cannot be eliminated by use of the fol lowing service instructions please cont...

Page 136: ...0 033 F 0 5 0 0033 F 0 5 Inductance 1 mH Ferrite core Inductors 2 LS 400A 100 mH Table 5 1 Components needed for performance verification 5 4 2 Performance Verification Procedure 1 After the line volt...

Page 137: ...every time the fixture configuration is changed 9 Press the MEASURE MODE key to select CONT continuous measurements 10 Press R Q 11 Insert as DUT the first resistor specified in Table 5 2 12 Verify th...

Page 138: ...ect readout is the larger 4 digit number 330 2 and the fifth digit is acceptably stable 18 Press L Q 19 Insert as DUT the first inductor specified in Table 5 2 check number 10 20 Verify that the displ...

Page 139: ...ress 2 SHIFT BIN NO 0 1 D Press MEASURE RATE if necessary to select SLOW rate E Press MEASURE MODE to select CONTINUOUS mode 3 With the watch or clock time the interval between the next two keystrokes...

Page 140: ...xample if x 771 then T 78 ms 5 G Clear bin sum registers by pressing SHIFT BIN SUM 0 0 1 4 5 5 Disassembly and Access 1 Disconnect the power cord Optionally re move the bail from the front feet by ben...

Page 141: ...ages will not be present on wires and terminals that will be exposed in the following steps the display connector board Behind the keyboard is the keyboard mount a wide bracket with clearance holes fo...

Page 142: ...the left of the display panel connector board during reassembly to avoid pinching the cables 1 2 3 4 5 7 13 6 8 9 10 12 11 Figure 5 2 Interior top view of 1693 Digibridge Item Description 1 Power Sup...

Page 143: ...sed after first re moving the air deflector 2 screws near the right rear air vent D Remove the main board forward and upwards If removal is obstructed by the front panel assembly that can be removed f...

Page 144: ...Reassemble the instrument and verify nor mal operation To relocate the bnc connec tor bracket to the front again reverse this procedure 5 5 2 Major internal components The following figures show the m...

Page 145: ...erface 1689 9640 top view Figure 5 5 Keyboard Assembly 1687 4200 Figure 5 6 Power Supply Assembly 700011 To remove the IEEE board 1 Switch POWER OFF and disconnect power cord from Digibridge 2 Place t...

Page 146: ...Maintenance 5 6 1 Care of Test Fixtures For best results and minimum maintenance effort the operator must remove any obvious dirt from leads of DUTs before inserting them into any test fixture Test f...

Page 147: ...d in para graph 3 13 If a self check failure occurs the instru ment display will indicate the nature of the failure For more detail refer to paragraph 5 7 2 below Telltale symptoms Scan the following...

Page 148: ...he self test routine and bold the display until the key is released Look for trends or tests that pass only marginally SELF CHECK FAILURE DISPLAYS 88888 8888 RAM read write exercise failure Digibridge...

Page 149: ...ult in the keypad is found 1689 4702 Analog Control board requires service by trained personnel ANALYSIS PROCEDURE Check the following circuits 555 D XXXX Signal strength check failure the Digibridge...

Page 150: ...between the stored calibration data for the range and the normal expected values The calibration can be expressed essentially as the conductance of the internal standard resistor The Digibridge norma...

Page 151: ...raph 3 7 1 replacement of the capacitor discharge fuse may be necessary WARNING Take appropriate safety precautions when servicing the unit Internal Fuse Figure 5 11 Location of internal fuse 1 Remove...

Page 152: ...g properly confirm the following voltage outputs See Figure 5 12 5 V Digital GND Digital 5 V Analog 8 V Analog GND Analog GND Analog 8 V Analog 5 V Analog GND Digital 5 V Digital Regulator Board Test...

Page 153: ...he DUT 4 Use an oscilloscope to verify that the signal at the right hand end of the DUT in the test fixture is a sine wave as follows For scope ground return connect to the ground plane on the circuit...

Page 154: ...Fixture This procedure requires that a remote test fixture 1689 9600 be connected to the 1693 For example if your 10 pF standard is known to be 10 18 0 25 pF then compute the new tolerance as follows...

Page 155: ...o be lit I Connect the two type 874 tees together CAUTION Be sure the line voltage switch rear panel is correctly set for your power line voltage J Press these keys deliberately 1 6 9 3 SHIFT SHORT K...

Page 156: ...Z capacitors If the dissipation values are known more accurately the acceptable QDR display criteria can be reduced accordingly Alternative capacitance standards are available for checking the Digibri...

Page 157: ...dard are used 8 Set the dials on the capacitance standard thus CAPACITANCE 1 F TEST FREQUENCY 1 kHz NOTE For detailed information on connecting to the GR 1417 4 Terminal Capacitance Standard see secti...

Page 158: ...a plugs to the 1433 33 Decade Resistor as follows High leads red and red white to the H binding post Low leads black and black white to the L binding post Guard lead black green to the G bind ing post...

Page 159: ...ghten the screws to provide ground guard connection 2 Connect the high leads red and red white together and separately connect the low leads black and black white together 3 Before measurement zero th...

Page 160: ...d verify that the RLC display is between the extremes listed for 1 mH SLOW measurement rate first line of table 8 Repeat steps 4 through 7 with the other in ductance standards 1 mH 100 mH 1 H and 10 H...

Page 161: ...ess the following keys 1 6 9 3 SHIFT OPEN E Confirm that the GO indicator is lit F Keep hands and objects at least 10 cm 4 in from test fixture G Press the START button H Wait for the GO indicator to...

Page 162: ...nts as follows The resistance standard 1433 33 or equivalent is required for this test 1 Confirm or select measurement conditions on the Digibridge as listed FUNCTION ENTER DISPLAY VALUE MEASURE RATE...

Page 163: ...139 1693 RLC Digibridge Service and Maintenance Table 5 11 Entry of limits Table 5 12 Bin assignment check...

Page 164: ...ncy calibration paragraph 5 9 7 is neces sary and should be completed before recalibrating any range if any of the following is true If the Dallas Chip has been replaced If oscillator U4 has been repl...

Page 165: ...ion resistor as in the following example based on the values R 24 895 ohms and Q 15 ppm NOTES The Digibridge will accept six digits for R even though only five will be displayed The Q is associated wi...

Page 166: ...ppm The NO GO indicator will probably be lit this is normal 5 Disconnect the calibration resistor from the test fixture 5 9 5 Recalibration for Range 2 1 Connect the 5 97 kilohm calibration resistor t...

Page 167: ...ll probably be lit this is normal 5 Disconnect the calibration resistor from the test fixture 5 9 7 Frequency Calibration If frequency calibration is not necessary refer to Decision in paragraph 5 8 1...

Page 168: ...GE 2 press 1 6 9 3 6 SHIFT SPECIAL SHIFT ohms 11 176 Kohms 01118 D For RANGE 3 press 1 6 9 3 7 SHIFT SPECIAL SHIFT ohms 4 6000 Kohms 0 046 0 E For RANGE 4 press 1 6 9 3 8 SHIFT SPECIAL SHIFT ohms 5 58...

Page 169: ...value For example range 1 press 7 9 8 8 3 SHIFT NOM VALUE E Store the K factor for each range for range 1 press 1 6 9 3 1 SHIFT SPECIAL SHIFT Figure 5 14 Calculating the K factor for range 2 press 1...

Page 170: ...of the Service Section 2 Find S2 which is located at the end of the interface option board about 3 cm 1 in from the TALK switch S1 If S2 is covered lift the cover off exposing the DIP switch which ha...

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