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9916

UHF Frequency Meter

Workshop Manual

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Ron G7DOE

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G0RSQ

February 2015

Summary of Contents for 9916

Page 1: ...9916 UHF Frequency Meter Workshop Manual Courtesy of Ron G7DOE Racal_Dana user group Click to join Racal_Dana Please enjoy responsibly G0RSQ 14th February 2015...

Page 2: ...MANUAL RAeAL Fre uency CQ Model 9916 For all your Technical Information and Spares contact HESING TECHNOLOGY CROMWELL CHAMBERS 8 ST JOHN S StREET HUNTINGDON CAMBS PE18 6DD Telephone 0480 433156 Fax 04...

Page 3: ...1 5 PONt N 8 7 117 Ov e rlo IZe Oj J2L A O V loJne CLLe I O Iec O cs 5 ephe Roo A C o c k 0 se 0 reI 01 2 5 5 l j 2 O If f fWOH 81STI UHF Frequency counter 9916...

Page 4: ...Amendments to this handbook if any which are on coloured paper for ease of identifi cation wi 11 be found at the rear of the book The action ca 1I ed for by the amendments should be carried out by ha...

Page 5: ...f the Pozidri v type Phillips typeand Pozidriv type screwdrivers are not interchangeable and the use of the wrong screwdriver will cause damage POZIDRIV is a registered trade mark of G K N Screws and...

Page 6: ...ment Normal 2 1 Frequency Measurement Burst 2 2 Frequency Measurement LF Option 2 2 Battery Economy Operation 2 2 Standby Operation 2 3 Battery Charging 2 3 Carrying Handle 2 3 Description of Controls...

Page 7: ...s Overflow Gate Indi cator Display Blanking Manual Res et Externa I Hold and Reset Burst Mode Summary of Operation Circuit Operation Check Mode Power Supply Lirle Power 5 Vol t Stabil iser 5 Volt Stab...

Page 8: ...hannel A I Overload lndi cator Check Frequency Standard Check Infernal Frequency Standard Caf ibration LF Multiplier Dismonding and Reassembly Remova I of Display PCB Removal of fvbin peB Fitting Freq...

Page 9: ...N D CIRCUIT DIAGRAMS C ponent Layout Display Assembly Parts List 1 Display Assembly Page Tech Spec 8 Tech Spec 9 5 1 5 4 5 7 5 7 5 8 5 9 5 10 5 12 5 13 Fig 1 Circuit and Component Layout Oscillator As...

Page 10: ...SECTION 1 TECHNICAL SPECIFICATION...

Page 11: ...in the CHECK position the display shows Channel A Al I digits set to 8 to check all segments Channel I B operation Counter reads 1 MHz to check Gate Charging Indicator Bat tery Low Indicator Overload...

Page 12: ...35V r m s maximum by p i n diode attenuator and reed relay Input frequencies are prescal ed by a factor of ten 50 dB minimum range AGe output is available at two pins on rear panel 10Hz to 60 MHz Bet...

Page 13: ...t Mode the gate remains closed unti I triggered by incoming signal After measurement the display is held until manually reset The minimum signal durati ln is 40 ms plus gate time See Option 09 Refer t...

Page 14: ...0 225 1 212 238V 5 21 2 238V 224 251 V 6 224 251 V 235 265V Refer to Chapter 5 for setting instructions 19 VA approximately 10 ENVIRONMENTAL AND SAFETY SPEC IFICAT IONS Operating Temperature Storage T...

Page 15: ...RD 9442 Type Frequency Ageing Rate Warm up Time Tempenture Stability A fast warm up ovened oscillator suitable for the majority of applications 14 OPTION 048 FREQUENCY STANDARD 9421 Type Ageing Rate W...

Page 16: ...POWER PACK OPT ON PART No 11 1289 Mechani ca I Selection Battery Life Battery Condition Charge Ti me Standby Foci Iity 9916 Vol 2 Battery Pack is mounted on a metal tray inside the instrument and conn...

Page 17: ...SSORIES Accessories avai lable 9916 Vol 2 To increase measurement resolution at low frequencies on IB input channel 10Hzto25kHz x 100 As selected by Resolution switch Rigid carrying case 15 0450 Padde...

Page 18: ...F 10kHz Sync I 7 External Reset Input H Main Gate 1 8 Not Used J Not Used I 9 K Time Base c z 1 Logic 11 10 b L y Information I I 11 M See Table 2 a x I 12 R 0 N Not Used 13 Hold Reset P Not Used 4 P...

Page 19: ...DATA OUTPUT FORMAT A3 The b c d outp _ t data is available at the 28 way edge connector in a bit parallel byte serial form The data is sequenced by a la kHz synchronising signal The data presentation...

Page 20: ...10 KHz SYNC PIN F I RIOI rPIN 12 I OUTPUT STAlES DATA OUTPUTS SLJ1J1J I lIT 10 10 7 9916 Vol 2 v v DIGiT DATA OVER OVERFLOW FLOW AN d Data Sequence Diagram Fig A 1 Tech Spec 10...

Page 21: ...SECTION 2 DESCRIPTION OPERATION MAINTENANCE...

Page 22: ...0 ohm channel covering the range 40 MHz to 520 MHz prescaled by ten and with a g c automatic overload protection and I e d overload indicator SPECIAL FEATURES Larae Scale Intearation 1 4 The heart of...

Page 23: ...stomer s option one of three 5 MHz oscillators from the Racal Dana range can be fitted Details will be found in the Technical Specification Option 04C is a discrete component oscillator and a parts li...

Page 24: ...ies from the internal charging circuit When on battery operation a warning light indicates when battery voltage is low To fully charge a discharged battery requires 14 hours Avoid overcharging as it w...

Page 25: ...nnel A or B as required 2 Connect the external signal to the appropriate input socket A or B The damage overload input levels are Input A 3SV r m s overload protection above SV r m s Input I B 250V r...

Page 26: ...ess and release the RESET button The display except the d p will go blank When a signal burst is received it will be measured and the display held until the RESET button is operated again FREQUENCY ME...

Page 27: ...nnect the a c supply Set the rear panel switch to the CHARGE position 3 Set the front panel Power switch to ON Verify that the CHARGE indicator lights The time reguired for a complete re charge is 14...

Page 28: ...off irrepective of the type of power supply This four position switch selects the appropriate gate time from the time base to give the required resolution Generally the switch will be set so that the...

Page 29: ...egra ted circuit lC4 which achieves large scale integration using the col lector diffusion isolation principle For convenience IC4 will often be referred to in the handbook as the CDI Chip Fig 3 1 is...

Page 30: ...full charge facilities are included Charge and Battery Low indicators are provided Suppl ementary power supply circuits provide 24V for the A ampl ifier and 2V for the COl Chip A battery economy faci...

Page 31: ...rt of the system is in the CDI Chip 3 5 In the CDI Chip the data stores feed in parallel into a common b c d four Iine output The store outputs are enabled in turn for approximately 100 micro seconds...

Page 32: ...lC s discrete pull_up resistors are provided in the circuit These resistors may be mounted In aled dual in line d i l packages for example R108 Fig 5 which has thirteen lk resistors with a common conn...

Page 33: ...Is after gate closure To initiate a new cycle of measurement the external hold must go high for not less than 200 ys External Reset 3 12 External reset is achieved by the appl ication of logic 0 to pi...

Page 34: ...nts Ltd NORMAL MODE Signal Input 4 3 Two input channels designated A and B cover the full frequency range of the instrument Separate input sockets are provided Details of the frequency coverage are gi...

Page 35: ...bited Overload Protection and Indication 4 11 Signals applied to the A Channel input are passed to the peak to peak detector C35 D9 D10 and C37 Increasing signal amp itude resul ts in the detector out...

Page 36: ...e A Channel seiected IC9b 5 is set to 1 via IC10a Provided IC9b 4 is also at 1 see paragraph 4 10 A Channel signals will pass to IC4 22 IC8b is inhibited by a 0 at pin 12 and IC9a is inhibited by a 0...

Page 37: ...he instrument The circuit is shown in Fig 2 Access to the trimming capacitor C4 is via an aperture in the rear panel Internal Standard Buffer 4 25 The internal standard signal is buffered by Q29 and I...

Page 38: ...o correspond 4 33 The use of he A Channel which is prescaled by 10 requires the movement of the decimal point to the right by one position while use of the LF multiplier requires a shift to the left o...

Page 39: ...cate that overflow has occurred 4 40 IC14b is returned to the cleared state by a 0 at pin 13 at the end of the main gate period Gate Indicator 4 41 The main gate waveform is inverted by IC7a When the...

Page 40: ...with the conditions in paragraph 3 11 the counter will go into the H01 d state at the end of the measurement in progress 4 47 The application of a Q at pin 7 of the Data Output socket results in opera...

Page 41: ...hat the display will be held at the end of the gate period IC13q 3 goes to 0 and causes IC2b to generate a stores update pulse at IC4 4 The circuit will remain in this condition until the RESET button...

Page 42: ...with 0 volts and regulates the volt drop across 051 via 032 to maintain a constant potential on the 5 vol trail 5Volt Stabiliser 4 58 The 5 volt rail is stabilised by 052 which is controlled by IC11b...

Page 43: ...egulator 014 Q14 is controlled by 015 which obtains its reference voltage from IC4 11 Battery Charg ing 4 61 If fitted the batteries receive trickle charge whenever the instrument is operating from a...

Page 44: ...r of 050 The same supply turns on Q31 via R130 and R135 since when CHARGE is sel ected there is no supply to IC7 and therefore no clamp ing action at the R130 R135 junction Battery Power 4 64 With 52...

Page 45: ...035 on and so shunt the base current away from 052 This Iimi ts _ he current available From the 5 volt supply TANDBY OFf RATION 4 69 With 153 at OPERATE the base of 050 is connected to ground via R125...

Page 46: ...se locked loop The output of ICl is fed to one of the phase comparator inputs 1C2 14 The oscillator frequency is controlled by 1 The vol tage at IC2 9 2 The resistance from IC2 11 to the negative rail...

Page 47: ...ifier BNC IT piece BNe Termi nati ng Pad Coaxial leads Variac Bandwidth d c to 50 MHz Y Sensitivity 50 mV cm 1 MHz accurate to 1 part in 10 8 Output 1 volt r m s nomina Frequency range 8 Hz to 550 MHz...

Page 48: ...re TRANSFORMER VOLTAGE SELECTION 5 2 Ensure the voltage range selected is suitable for the local supply To check the selection proceed os follows FUSES 1 2 3 4 5 6 Unplug the power cable from the supp...

Page 49: ...100 112 q 0 N IBIl 2 2VISWITCH TO AI 2OO 22SVISWlTCH 10 BI 200_125V SWITCH la A 212 naV ISy tTCH TO 8 I 100 I 111 o o o I 100 o 212 2J8VISWITCH 10 AI 224 25IV ISWITCH la B l A lOO 112 o 0 12S 0 f 224...

Page 50: ...0 106 119 118 132 390 70 440 70 188 212 200 225 1220 180 1300 200 200 225 212 238 1300 200 1380 200 212 238 224 251 1380 200 1450 220 224 251 235 265 1450 220 1530 220 Supply Rai I Voltages 5 6 1 2 3...

Page 51: ...pack is fitted It can be checked by inserting a multimeter set to an appropriate current range in series with the battery lead or by measuring the volt drop across a charge path resistor and calculat...

Page 52: ...he OVERFLOW STANDBY indicator should be extinguished After approximately one minute the display should again blank out and the OVERFLOW STANDBY indicator should light PERFORWv NeE TESTS AN D CA liBRAT...

Page 53: ...Select INPUT B and with the RESOLUTION switch set as shown in Table 6 verify that the correct displays ore obtained TABLE 6 B Channel Decimal Point and Self Check Resolution Display 0 1 Hz 1000 0000 k...

Page 54: ...e T piece 5 21 Set the controls of the UUT as follows 1 NORMA ljBURST CHECK switch to NOR w L 2 OPERA TE STAN BY switch to OPERATE 3 4 Channel B selected RESOLUTION switch to 10Hz 5 22 Set the signal...

Page 55: ...all zeros until the end of the gate period and then indicates the appl ied frequency 5 25 Press and release the RESET button and check that the frequency displayed at the end of the gate period is co...

Page 56: ...he AGC output pins on the rear panel Check that the A GC vo tage becomes more positive as the input leve I increases from zero to 100 mV r m s 7 dBm and remains within the range 1 0 2 volts 6 1 vo Its...

Page 57: ...BURST CHECK switch to NOR v A L 2 OPERA TE STANDBY switch to OPERATE 3 Channel A selected 4 RESOLUTION switch to 10 Hz 5 40 Set the output of the signal generator to a level which will give a power a...

Page 58: ...47 Equipment reguired Item Osci Iloscope Frequency Standard Coaxia I leads Table 3 tern No 2 3 8 5 43 Connect the oscilloscope to monitor the 1 MHz OUTPUT socket on the rear panel of the UUT Connect...

Page 59: ...NOR vV L 2 OPERA TE STANDBY switch to OPERATE 3 LFselected 4 RESOLUTION switch to 1 Hz 5 53 Apply the frequencies shown in Table 11 at a level of 8 mV r m s 29 dBm Verify that a stable and accurate d...

Page 60: ...board 7 Remove the screws securing the front panel and withdraw the front panel and display p c b as far as the wiring permits 8 Remove the seven screws securing the display p e b to the front panel...

Page 61: ...4 0155 FITTING FREQUENCY STANDARD 9421 or 9442 5 60 It should be noted that the frequency standard model 9421 cannot be fitted iF the battery pock is fitted 5 61 Remove the top cover of the instrument...

Page 62: ...of the left hand side member with the large hole over the carrying handle nut Secure it to the side member wi th two M4 screws and cri nk e washers 4 Take the battery pack with the batteries uppermost...

Page 63: ...ving the two retaining screws It is not necessary to unsolder the connections 3 Attach the LF multiplier p c b to the side panel using the screws washers and spacers provided Threaded mounting holes a...

Page 64: ...SECTION 3 PARTS LISTS CIRCUIT DIAGRAMS AND COMPONENT LAYOUTS...

Page 65: ...0 2471 Carbon Fi Im 1 5 470 R3 4 20 5500 DIL Array 7x56 R4 Integrated Circuit 22 4128 Swi tches 23 4099 23 4100 Indicators 26 1508 26 5004 Capacitors BCD to 7 Segment Decoder 74247 Switch Slide 2 Posi...

Page 66: ...100 R1 4 20 2102 Carbon Film 1 5 1k R2 4 20 2103 Carbon Film 1 5 lOk R4 4 20 2153 Carbon Film 1 5 15k R3 4 Capacitors V F 21 1616 Ceramic 12 20 lOOn Cl 21 2621 Silver Mica 125 5 27p C5 21 2631 Silver...

Page 67: ...11 1310 21 4528 Capacitor Polyester 400V 10 47nF ClOO 23 3030 Socket BN Z SK50 51 23 4013 Switch S50 23 4097 Switch S53 REAR PANEL ASSEMBLY 11 1311 11 1254 17 4056 22 1650 23 0031 23 0043 23 0044 23...

Page 68: ...32 21 1003 Tantalum 20 20 ISf C13 1571 Carbon Film 0 1 5 12K R9 21 1006 Tar talum 20 20 4 7f 30 1572 Carbon Film 0 1 5 47K R30 21 1029 Tantalum 35 20 1 5 J C31 2006 Carbon Film 1 5 3 3 R154 21 1038 T...

Page 69: ...AND Gate 74510 IC9 22 4202 Dual Frequency Compensated Operational IC6 11 25 31 Amplifier 747 22 4204 Wideband UHF AmpIifier 1C26 OM335 22 4245 Differential Video Amp Iifier 1C30 Selected 72733 22 4500...

Page 70: ...20 2392 Carbon Film 1 5 3 9k R8 4 20 2473 Carbon Film 1 5 47k R1 5 4 20 2562 Carbon Film 1 5 5 6k R6 4 20 2564 Carbon Film 1 5 560k R3 4 CopJCitors V F 21 1002 Tantalum 20 20 10f l C5 6 21 1029 Tanta...

Page 71: ...0 D rt 1 1 I Xl I 0 1 I 11 LP1 L j tJ j LP4 LP3 LP2 GGO_Rl LK2 I D I t D 2 0 LP8 D l 3 o l 4 0 LP7 D L 5 R2 D I 6 Lf Ju N U l uUu u LP5 I I I I I R31 0 SKI D I 7 D L 8 b LP6 I r u UU I Component Layou...

Page 72: ...100 R3 15K Xl1 5MHz Ri 10K Cl 2 ISp CS 27p 3 o Cl C5 C3 1 2 o 0 R2 c J c J R 1 M c J R3 V C2 c J R I 8 EJ ____1 9 0831 I WOH l19 083i I L 1 L1_ _Zl I Circuit And Layout 5MHz Oscillator peB 19 0834 Fi...

Page 73: ...l i2 ClIBO C4S M Q9 248 1 044 C4Cl1 rliCll4 1201 10 lOOn 21 I I4 r l 5 lQS 10 247 2Cl19 3 0 IC 24 O ItS n7 CS9 4 7M I SI 47 C9S 0 24S 270 C4 2S2 r lOn 39 220 1C41 1 0 01 240 lllOl 011 O 2 7 2 9 rf Z Z...

Page 74: ...CHANNItI E C r I F 5E C r LAMP 1 E l IWOH 8153 I 1121 Overall Circuit Diagram Part 2 9916 Fig S...

Page 75: ...r _ 4 l c I r I L _ l _ I r It 0 L J L _ L _ _ l ICt J cll ll lilh 111 n 17 r 1 5r i 2 J 0 C rcull and layo l LF lv1ulliptl u Assembly Fig 6...

Page 76: ...SECTION 4 APPENDICIES AND CHANGE INFORMATION...

Page 77: ...3 USfNG EQUIPMENT WHICH PROVIDES HOLD SIGNALS 3 Frequency Meters Normal Use 4 Universal Counter Timers UCT s Basic Hold Requirements 5 UCT s Using Print Hold Mode 5 UCT s Using Hold Reset Mode 5 SPEC...

Page 78: ...al returned by the users equipment to the interface for control purposes Print Command a signal output by the interface to indicate that new measurement information is available Print Hold input An in...

Page 79: ...ubled except the print command pulse width NEW MEASUREMENr NEW MEASUREMENT OArA OLO MEASUREMENr DATA GATE TIME L E D_O r _ I I I I I I l zmsflmsl I I I I I I I I I I ix I I I qOArA Nor VALID I I I OAr...

Page 80: ...a period longer than the gate time check the following pin conditions on the 50 way connector Pin No 19 24 49 Required Connection Must be ei ther open circuit or connected to OV Latched Operation 9 Th...

Page 81: ...unchangedwhilst a Hold is applied the counter continues its normal measurement sequence i e free run This has the advantage that the next Print Command will be given at the end of the gate time immed...

Page 82: ...ay connector are as follows Pin No Pin 19 Pin 49 Pin 24 Regui red Connection Connected to Pin 50 or to 5V via 1800 Connected ro the Hol d si gnal source To be open circuir or connected to 0 UCT s Usin...

Page 83: ...the reading at the end of the next gate time will be incorrect Altematively if the correction process takes more than one gate time the end of gate time immediately following the process will also gi...

Page 84: ...ng to the end of gate time produced by the reset For cases where the correction time is short less than the Print Comr nand pulse width this may be implemented by linking the Print Command output pin...

Page 85: ...ot Connected M X 12 Ro N Not Connected 13 HOLD RESET P Not Connected 14 See NOTE R Not Connected NOTE 1 NOTE 2 In option 01 units with serial numbers after 1389 pin 14 of the flying lead connection is...

Page 86: ...T 2 4 8 4 10 8 DIGIT 2 4 8 1 2 4 8 See table 1 NOTE 1 8 10 8 DIGIT DECIMAL POINT PRINT COMMAND O P PR INT HOLD VP 5V VIA 180D 2 4 8 26 27 28 29 30 3l 32 33 34 35 36 37 38 39 40 4l 42 43 44 45 46 47 48...

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