Fluke 1920A User's Manual
Contents
1. el Counter Instruction Manual WARRANTY Notwithstanding any provision of any agreement the following warranty is exclusive The JOHN FLUKE MFG CO INC warrants each instrument it manufactures to be free from defects in material and workmanship under normal use and service for the period of 1 year from date of purchase This warranty extends only to the original purchaser This warranty shail not apply to fuses disposable batteries rechargeable type batteries are warranted for 90 days or any product or parts which have been subject to misuse neglect accident or abnormal conditions of operations in the event of failure of a product covered by this warranty John Fluke Mfg Co Inc will repair and calibrate an instrument returned to an authorized Service Facility within 1 year of the original purchase provided the warrantor s examination discloses to its satisfaction that the product was defective The warrantor may at its option replace the product in lieu of repair With regard to any instrument returned within 1 year of the original purchase said repairs or replacement will be made without charge if the failure has been caused by misuse neglect accident or abnormal conditions of operations repairs will be billed at a nominal cost in such case an estimate will be submitted before work is started if requested THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED T2. DATA OUTPUT OPTION 02 8 4 2 1 BCD output from each digit plus encoded decimal point and units annunciation information All outputs are CMOS Low Power TTL compatilbe HIGH true Print command is provided SUPERIOR TCXO OPTION 04 FREQUENCY sande adan K y e YA E DAN e end ada Eke boke ae IRINA MALI o 10 MHz AGING RATE per month da ka aka ka ka ka a a ka a kk k lt 3X 107 TEMPERATURE STABILITY l Orale SS E E E ENE TET lt 5 X 107 A EE EE O AN 2 X 107 typ LINE VOLTAGE FEIOR change 25005 Cl wa sean ON lt 5 X 10 RESOLUTION MULTIPLIER OPTION 06 FREQUENCY OPERATING RANGE ar e sens 10 Hz 10 kHz GATE MME o oa eee Vu SAD A 1 ms 1 Hz resolution 10 ms 0 1 Hz resolution 100 ms 01 Hz resolution 1s 001 Hz resolution 10s 0001 Hz resolution 1 GHz PRESCALER OPTION 13 FREOBENEV RANGE rd ee hb beca et do Sk ku 50 MHz to 1 GHz NEU IRENE e w sa atta 5ONVSWR 2 5 1 max OE A nata 5V fuse protected A II AA ET 8 ms 80 ms 0 8s 80s 1 25 GHz PRESCALER OPTION 14 PREGCUENCY RANGE ad al cabe 50 MHz to 1 25 GHz INPUT IMPEDANCE a bal kya y dya lah 502 VSWR 2 5 1 max OVERLOAD colui zar ili Tn BV fuse protected AN NA AEE E 8 ms 80 ms 0 85 80s _ 1920A aa 228 6 mm 9 00 in gt e 200 7 mm 7 90 in Figure 1 1 Model 1920A Outline Drawing 1 5 1 6 A Message From Some semiconductors and custom IC s can be damaged by
3. are available with the Model 1920A Each is listed by option number in Table 1 1 Ac cessories are listed and described in Table 2 1 Desired options must be specified at time of purchase A detailed description of each option is inchided in Section 6 Options and Accessories Table 1 1 Available Options FACTORY CUSTOMER Battery Pack Digital Output Unit Superior Texo Multiplier Reso ution 1 GHz Prescaler 1 25 GHz Prescaler Kits Available Tabie 1 2 1920A Accessories ACCESSORY DESCRIPTION PART MODEL NO NO A53 Antenna extendable whip 382762 Case Carrying 446803 MOO 200 625 Rackmount kit 390468 2010A 7023 Printer Interface kit 410472 1 1 3 1920A 1 8 Power requirements for the 1920A are 100 115 or 230 volts at 50 to 400 Hz for the line powered version Model 1920A 01 is equipped with rechargeable nickel cadmium batteries which provide a minimum of three hours 1 5 hrs with 13 or 14 Option installed of operation The battery powered unit also operates from the AC power line and at the same voltages as the line powered instru ment 1 9 The standard time base TCXO has an aging rate of 3 x 10 month and 2 x 10 0 C to 50 C An optional TCXO Option 04 provides an aging rate of 3 x 107 month and 5 x 1 07 0 C to 50 C In addition an external time base signal of MHz 5 MHz or 10 MHz may be connected via a rear panel BNC connector 1 10 S
4. electrostatic discharge during handling This notice explains how you can minimize the chances of destroying such devices Knowing that there is a problem Learning the guidelines for handling them Using the procedures and packaging and bench techniques that are recommended e N os The Static Sensitive S S devices are identifiedin the Fluke technical manual parts tist with the symbol The following practices should be followed to minimize damage to 5 5 devices 3 DISCHARGE PERSONAL STATIC BEFORE HANDLING DEVICES 2 KEEP PARTS IN ORIGINAL CONTAINERS UNTIL READY FOR USE 4 HANDLE S S DEVICES BY THE BODY Page 1 of 2 een 8 WHEN REMOVING PLUG IN ASSEMBLIES HANDLE ONLY BY NON CONDUCTIVE 5 USE ANTI STATIC CONTAINERS FOR EDGES AND NEVER TOUCH OPEN EDGE HANDLING AND TRANSPORT CONNECTOR EXCEPT AT STATIC FREE WORK STATION PLACING SHORTING STRIPS ON EDGE CONNECTOR USUALLY PROVIDES COMPLETE PROTECTION TO INSTALLED SS DEVICES 6 DO NOT SLIDE S S DEVICES OVER ANY SURFACE 9 HANDLE S S DEVICES ONLY ATA STATIC FREE WORK STATION 10 ONLY ANTI STATIC TYPE SOLDER SUCKERS SHOULD BE USED 11 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 in any Fluke Sancta technical manual for ordering instructions Use the 7 AVOID PLASTIC VINYL AND STYROFO
5. line powered and battery powered ver sions of the Model 1920A can operate from either a 115V or 230V ac power line Before connecting the power line ensure that the line power selection switch is in the position which corresponds to the power line voltage The power selection switch is located on the Main PCB refer to Section 4 for access instructions 2 8 RACK INSTALLATION 2 9 The Model 1920A may be center mounted in a standard 19 inch rack when supplied with the appropriate 1920A Section 2 Operating Instructions rack mounting kit Instructions for installing units in the rack mount are supplied with the rack mounting kit The center rack mounting kit is Model No MOO 200 625 2 12 OPERATING FEATURES 2 13 The location and function of all controls indi cators and connectors are shown in Figure 2 1 and des cribed in Table 2 1 2 14 OPERATING NOTES 2 15 The following paragraphs describe various condi tions which should be considered for operating the 1920A 2 16 AC Line Connection 2 17 The rear panel three prong U ground connector permits the 1920A to be connected to either 100 115 or 230V ac 50 to 400 Hz line power The offset prong on this connector is connected to the 1920A chassis and should be connected via the power cord to a high quality earth ground 2 18 OPERATION 2 19 Turn On Procedures 2 20 Use of the following procedure is suggested for initial turn on of the 1920A With referenc
6. used in the prescaled measurement mode This input is protected from overload to withstand inputs as high as five volts rms without damage Overload protection is provided by a PCB mounted 2 10A fuse 2 34 To make frequency measurements in the prescaled mode proceed as follows 1 Connect the input signal to the upper front panel BNC connector 2 Press the 50 MHz to 520 MHz switch 3 Select the desired resolution read the measurement on the display and note the unit of measurement i e MHz or kHz 2 35 Burst Mode 2 36 The function of the burst mode is to measure the frequency of keyed RF signals having a duration of 31 milliseconds or longer RF bursts must be longer than the gate time selected in order to achieve an accurate measure ment When using the DIRECT input the length of the burst must be at least 30 ms longer than the gate time selected i e 31 ms for 1 ms gate time 2 37 When using the PRESCALER input multiply the gate time selected by the prescaler division factor If the 1 ms gate time is selected the real gate time will be 4 ms for the 520 MHz Prescaler Add the 30 ms to these corrected gate times for the minimum burst length when using the prescalers NOTE Modification to lengthen the burst requirements to 30 ms has been added to the counter This 30 ms delay was added to insure the count would be of the desired signal frequency and not turn on transients 2 38 To make measurements of key
7. AM following part numbers when ordering these special IN WORK AREA bags John Fiuke Part No Description 453522 6 X 8 Bag PORTIONS REPRINTED en 12 Bag WITH PERMISSION FROM TEKTRONIX INC 453548 16 X 24 Bag AND GENERAL DYNAMICS POMONA DIV 454025 12 X 15 Bag tye gee a Pink Poly Sheet Wrist Strap 30x80 x60 Mil P N TL6 60 P N RC AS 1200 7 00 a Dow Chemica 20 00 Page 2 of 2 J00898 07U7810 SE EN Litho in USA 2 1 INTRODUCTION 2 2 This section contains operating information for the Model 1920A The contents of this section should be read before operating the counter Should any difficulties arise during operation of this instrument please contact your nearest John Fluke Sales Representative the John Fluke Mfg Co Inc P O Box 43210 Mountlake Terrace Wash 98043 Telephone 206 774 2211 A list of Sales Repre sentatives is given in Section 7 2 3 SHIPPING INFORMATION 2 4 The Model 1920A is packaged and shipped in a protective container Upon receipt of the equipment a thorough inspection should be made to reveal any possible shipping damage 2 5 If reshipment of the equipment is necessary the original container should be used If the original container is not available a new container can be obtained from the John Fluke Mfg Co Inc Please reference the equipment model number when requesting a new shipping container 2 6 INPUT POWER 2 7 Both the
8. O ANY IMPLIED WARRANTY OF MERCHANTABILITY FITNESS OR ADEQUACY FOR ANY PARTICULAR PURPOSE OR USE JOHN FLUKE MFG CO INC SHALL NOT BE LIABLE FOR ANY SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER IN CONTRACT TORT OR OTHERWISE if any failure occurs the following steps should be taken 1 Notify the JOHN FLUKE MFG CO INC or nearest Service facility 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 receipt of the shipping instructions forward the instrument transportation prepaid Repairs will be made at the Service Facility and the instrument returned transportation prepaid SHIPPING TO MANUFACTURER FOR REPAIR OR ADJUSTMENT All shipments of JOHN FLUKE MFG CO INC instruments should be made via United Parcel Service or Best Way prepaid The instrument should be shipped in the original packing carton or if it is not available use any suitable container that is rigid and of adequate size if a substitute container is used the instrument should be wrapped in paper and surrounded with at least four inches of exceisior or similar shock absorbing material CLAIM FOR DAMAGE IN SHIPMENT TO ORIGINAL PURCHASER The instrument should be thoroughly inspected immediately upon original delivery to purchaser All material in the container should be checked against the enclosed
9. PECIFICATIONS 1 11 Pertinent specifications for Model 1920A are listed below See Table 1 3 Several options and accessories are available for use with the 1920A Physical dimensions of the unit are shown in Figure 1 1 Table 1 3 Model 1920A Specifications FREQUENCY MEASUREMENTS RANGE Direct Prescaled BURST MODE Frequency Range Burst Duration GATE TIME Prescaled INPUT CHARACTERISTIC SENSITIVITY Direct Prescaled OVERLOAD Prescaled TIME BASE STABILITY FREQUENCY AGING RATE PER MONTH TEMPERATURE STABILITY 0 C to 50 C 20 C to 30 C LINE VOLTAGE 10 change 1 2 Ims 10ms 0 15 1 0s 10s 4ms 40ms 0 45 4 04s 40s 520 MHz 15 mV up to 100 MHz decreasing to 25 mV at 125 MHz 15 mV to 520 and 1000 MHz 150 V rms up to 1 kHz decreasing to 5V rms at 125 MHz 5 Vrms fuse protected Standard 04 Option 10 0 MHz 10 0 MHz lt 3X 10 lt 5X 107 2 X 1077 typ lt 2 X 10 lt 1 X107 lt 5 X 10 1920A Table 1 3 1920A Specifications Cont EXTERNAL TIME BASE INPUT FREQUENCY REQUIRED Vi a kk a ak kk a ak a a a a arras aa MHz 5 MHz or 10 MHz Wired for 10 MHz at Factory SENSITIVE Se Sie ven eee ad lira oh ee ee a aa ete 100 m Vrms IMPEDANCIA RA oe Le eee As RES 2k22 40 pF INPUT IMPEDANCE RECT ce lai bE EE OS O EEO Se AAA oew Ree ees 1M amp 2 30pF PRESCALED lt zy s aka Dads ee ee Chee cE ae 502 VSWR 2 5 1 max BURST MEASUREMENT ccc e
10. automatic decimal point positioning Display resolution is front panel selectable at 1 kHz 100 Hz 10 Hz 1 Hz or 0 1 Hz Annun ciators are provided to indicate the measurement unit i e MHz kHz or Hz and also overflow when the capacity of the display is exceeded All displayed measurement data is provided by an optional Data Output Unit DOU Option 02 1 4 Input sensitivity for the 1920A is better than 15 mV rms and AGC is incorporated to provide stable oper ation Extremely low level signals which cannot be reliably measured fall below the AGC threshold and are ignored by the counting circuitry A burst mode is provided to per mit the measurement of keyed RF signals having a duration of two milliseconds or greater The display is automatically heid at zero if the RF burst is of shorter duration than the selected gate time resolution 1 5 The 1920A also incorporates an optional high resolution mode Option 06 to permit the measurement of low frequency signals such as signalling tones while using conveniently short gate times In this mode input signals in the range of 10 Hz to 10 kHz are multiplied by a factor of 1000 allowing the use of shorter gate times for better resolution 1920A Section 1 Introduction amp Specifications 1 6 A self check mode of speration is also provided to verify proper overall performance of the digital circuitry and the display of the unit prior to use 1 7 Several options
11. e to the pre vious paragraphs turn on the 1920A as follows 1 install available options as required 2 Connect the 1920A to line power see paragraph 2 17 3 Press ON OFF Power switch 2 1 1920A 3 E 1920A FREQUENCY COUNTER FREQUENCY o EEE mo 3 5 Hz erik 50V RMS MAX 125 MHz Figure 2 1 Control and Indicator Locations Table 2 1 Contro and Indicator Functions Cont NAME FUNCTION 5 Hz 125 MHz Provides connection to the direct non prescaled input of the 1 MQ BNC l counter for signals in the range of 5 Hz to 125 MHz connector 50 MHz 520 MHz Provides connection to the prescaled input of the counter for 500 BNC signals in the range of 50 MHz to 520 MHz on the standard unit connector 50 MHz to 1 GHz and 50 MHz to 1 25 GHz are available with Options 13 and 14 respectively 22 10 11 12 13 14 15 16 7 18 19 20 1920A Table 2 1 Control and indicator Functions Gate Lamp UNLK Lamp Option 06 UNLOCK OVFL Lamp OVERFLOW Display LED s MHz Lamp kHz Lamp Hz Lamp POWER Switch RESET Switch RESOLUTION Switches BURST Switch CHECK Switch 5 Hz 125 MHz 1 MS Switch 50 MHz 520 MHz 5022 Switch 50 MHz 1 GHz or 50 MHz 1 25 GHz Retaining Screw Power Connector INT EXT Switch CLOCK Connector Lights to indicate a measurement is being made Part of Option 06 Lights when the x1000 frequency mu
12. ed RF bursts pro ceed as follows 1 Connect the input signal to the appropriate front panel BNC connector i e direct or prescaled input and press corresponding FREQUENCY selection switch di Press the BURST switch 3 Select the desired resolution and read the measure ment on the display If the display reads zero yet the GATE lamp flashes indicating that bursts are present and measurements are being attempted the Burst input is of shorter duration than the gate time must be selected Approximately 1 ms long er than selected measurable intervals 2 39 CHANGING THE EXT TIME BASE FREQ 2 40 The Model 1920A permits the use of an external time base in substitution for the internal t me base The external time base may be 1 5 or 10 MHz in the range of 1920A 100 mV rms to 20V rms Input impedance is 2 000 ohms 1000 ohms after clipping for signals above 500 mV rms Connection is made via the rear panel BNC connector and the INT EXT slide switch is placed in the EXT position It may be necessary to make a jumper modification on the main PCB assembly in order to accommodate the particular external reference frequency being used For instance the Model 1920A is factory jumpered for a 10 MHz external reference signal and must be modified if a 1 MHz or 5 MHz signal is to be used 2 41 To modify the main PCB assembly for the appli cation of a 1 MHz or 5 MHz external reference signal proceed as follows 1 Remove
13. ee ee kK k r Measures frequency of RF burst is approximately 2 0ms This allows for signal settling Dispiay is automatically reset to zero if burst width is less than the gate time selected GENERAL DISPLAY 2 ed Ge Ehlers cai 9 digits LED leading zero suppression time between succes sive measurements is 200 ins plus gate time ANNUNCIATION INDICATOR LED s Fore Tere re ere Cre Vea ean OVEL Overflow MHz UNLK Unlock kHz GATE Hz OPERATING TEMPERATURE pink eae SCRIVE AT 0 C to 50 C operating 0 C to 40 C during charging with option 01 40 C to 60 C storage POWER REQUIREMENTS De HH HHH 115 230V 10 100V AC available 50 to 400 Hz 15 watts typical EINE POWER FUSES su ee 1 4A AC line version 1 2 slo blo battery version oo DIMENSIONS WEIGHT si Width max See DELI tiradas AO in Height max yV ern 80 3mm Sk kk 3 16 in Depia ieri NNN S25 Sie A kk 13 2 in Weight approx estao 2 7 KO ern 6 Ibs Weight with Batteries approx Ileana 8 Ibs BATTERY RECHARGEABLE OPTION 01 NICKEL CADMIUM Discharge Time Min 3 hrs 1 5 with 13 or 14 Option installed after full charge time Charge mem Sette ERE 14 hrs unit not turned on 56 hrs unit turned on NOTE Batteries should be fully discharged and recharged occasionally to maintain good long term usefulness 1920A Table 1 3 1920A Specifications Cont
14. either the internal timebase or an external time base signal applied to the CLOCK Connector Provides for connection of an external timebase signal of 1 MHz 5 MHz or 10 MHz depending on internal jumper configuration when the INT EXT switch see item 21 is placed in the EXT position 1920A 2 21 Turn Off Procedure 2 22 The turn off procedure consists of setting the ON OFF Power Switch to the OFF position by first pressing down and then releasing 2 23 Operating Functions 2 24 The following paragraphs describe the self check frequency measurement direct mode prescaler mode burst mode external timebase and give procedures necessary to operate the 1920A for each 2 25 SELF CHECK MODE NOTE The following procedure assumes a 10 MHz timebase Substitute appropriate readings if a 1 MHz or 5 MHz external timebase is being used 2 26 The self check mode provides a means of verifying proper overall operation of the counter excluding the direct input amplifier the prescaled input amplifier and the high resolution multiplier To self check the unit proceed as follows 1 Press the Power switch to the ON position 2 Press the CHECK switch lt A Press the RESET switch All display segments should light The display should read 888888888 4 Press the 1 kHz RESOLUTION switch The display should read 10 000 MHz 1 digit 5 Press the 100 Hz RESOLUTION switch The dis play should read 10 0000 MHz 1 digit 6 P
15. ltiplier high resolution function is selected and the frequency multiplier has not yet achieved phase lock up giving an ambiguous display Lights to indicate that the display capacity has been exceeded due to selection of fine resolution long gate time Display consists of nine digits Leading zeros are suppressed Lights to indicate display is reading MHz Lights to indicate display is reading kHz Lights to indicate display is reading Hz A push push switch to energize the counter A piano key switch when pressed resets the counter to zero and initiates another measurement When pressed with CHECK function selected causes ali correctly operating display segments to illuminate A series of five switches to select the desired measurement resolution For example if 10 Hz Resolution is selected the least significant digit LSD represents 10 Hz A piano key switch to select the Burst mode of operation which measures keyed RF bursts A piano key switch to select the Self Check mode of operation A piano key switch to select the direct non prescaled input for measurement of signals in the range of 5 Hz to 125 MHz A piano key switch to select the prescaled input for measurement of signals in the range of 50 MHz to 520 MHz 50 MHz to 1 GHz Option 13 or 1 25 GHz Option 14 Philips head screw attaching case to instrument chassis Provides connection through line cord to AC power line Slide switch to select
16. packing list The manufacturer will not be responsible for shortages against the packing sheet unless notified immediately If the instrument is damaged in any way a claim should be filed with the carrier immediately To obtain a quotation to repair shipment damage contact the nearest Fluke Technical Center Final claim and negotiations with the carrier must be completed by the customer The JOHN FLUKE MFG CO INC wili be happy to answer ali applications or use questions which will enhance your use of this instrument Please address your requests or correspondence to JOHN FLUKE MFG CO ING P O BOX 43210 MOUNTLAKE TERRACE WASHINGTON 98043 ATTN Sales Dept For European Customers Fluke Holland B V P O Box 5053 5004 EB Tilburg The Netherlands For European customers Air Freight prepaid John Fluke Mig Co inc P O Box 43210 Mountlake Terrace Washington 98043 Rev 4 80 1920A Model 1920A Frequency Counter vi 1 1 INTRODUCTION 1 2 The Fluke Model 1920A Digital Counter is a 5 Hz to 520 MHz to 1 GHz or 1 25 GHz optional counter de signed primarily for telecommunications applications The unit is compact and lightweight making it fully portable and suitable for field use An optional battery operated version of the counter permits use at remote or mobile installations where AC line power is unavailable 1 3 The display is nine digits light emitting diode LED type with leading zero suppression and
17. ress the 10 Hz RESOLUTION switch The display should read 10000 00 kHz 1 digit 7 Press the 1 Hz RESOLUTION switch The display should read 10000 000 kHz 1 digit 8 Press the 0 1 Hz RESOLUTION switch The dis play shouid read 10000 0000 kHz 1 digit 2 27 FREQUENCY MEASUREMENTS 2 28 Signals to be measured by the Model 1920A are applied to either one of two BNC input connectors mounted on the left side of the front panel The direct input lower connector accepts signals in the range of 5 Hz to 125 MHz The prescaled input upper connector accepts signals in the range of 50 MHz to 520 MHz The input impedance of the 2 4 direct input is 1 Megohm shunted by less than 30 pF while the prescaled input is 50 ohms 2 29 Direct Mode Color Coded Blue 2 30 The 5 Hz to 125 MHz input is used in the direct measurement mode This input is protected from overload to withstand inputs as high as 150 Volts rms at frequencies below kHz without damage Overload capability decreases from 150 Volts rms at I kHz to 5 Volts rms at 125 MHz 2 31 To make frequency measurements in the direct mode proceed as follows 1 Connect the input signal to the lower front panel BNC connector 2 Press the 5 Hz 125 MHz switch 3 Select the desired resolution read the measure ments on the display and note the unit of mea surement i e MHz kHz 2 32 Prescaled Mode Color Coded Yellow 2 33 The 50 MHz to 520 MHz input is
18. the unit from the case by loosening the two retaining screws on the rear of the case 2 Locate the reference jumper pads on the main PCB If so equipped remove the DOU PCB assembly or the Battery PCB assembly and swing away to the side 3 Using a suitable cutting tool such as an X acto Inc knife sever the conductive land between the REF and 10 pads 4 Using a piece of 22 AWG wire insert and solder a jumper between the REF pad and the 1 pad fora 1 MHz reference or a 5 pad for a 5 MHz reference 2 5 2 6 ta
Download Pdf Manuals
Related Search