3048A_Option_K23_DC-Block-Filter
Contents
1. 5 55555 5 5 64 5 59 6 54 10100C PROCEDURE 1 Connect the equipment as shown in figure 3 5 2 Set the DETECTOR POLARITY switch to the POS position 3 Turn on the power supply and set it for 30 Volts 4 Mait for 2 minutes and then read the voltmeter Record the voltmeter reading below Voltmeter reading _ _ spec lt 3 5 mV Figure 3 5 Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Opt ion K23 72 HEWLETT 03048 92036 Page 14 of 20 SECTION IV REPLACEABLE PARTS Table 4 1 lists the replaceable parts It is organized with the electrical components first in alphabetical order by reference designator followed by mechanical parts The following information is given for each part the reference designator the HP part number the total quantity Qty used in the instrument the part number check digit CD and the description of the parts Table 4 1 Replaceable Parts HP PART QTY DESCRIPTION NUMBER DC BLOCKING FILTER ASSEMBLY CAPACITOR FXD 4 7PF 5PF 200V CER NOT ASSIGNED CAPACITOR FXD 10 10 50VDC MET POLYE CAPACITOR FXD 100UF 75 10 50VDC AL 03048 60103 0160 3873 0160 5469 0180 1819 East 0180 1819 0180 1819 0180 1819 0180 1819 0180 1819 0180 1819 0180 1819 0180 1819 0180 1819 0180 1819 0180 1819 0180 18192. 03048 02013 08665 21006 08665 21006 1250 0569 1250 0569 1250 2280 1250 2280 gt 0000 14 40 0000000000 HEWLETT PACKARD COMPANY TAF C 34 Spokane Copyright 1988 East 24001 Mission Avenue Spokane Division WA 99220 U S A 3048A Opt ion K23 HEWLETT 03048 92036 Ka PACKARD oF 20 SECTION V SERVIC 5 1 INTRODUCTION This section contains information for troubleshooting and repairing the DC Blocking Filter Also included in this section are schematics and parts lists for the Impedance Matching Network and Calibration Load required to run the Performance Tests 5 2 IMPEDANCE MATCHING NETWORK The Impedance Matching Network requires no periodic maintenance If servicing is required refer to the schematic diagram in figure 5 1 on page 17 of this manual 5 3 CALIBRATION LOAD The Calibration Load requires no periodic maintenance If servicing is required refer to the schematic diagram in figure 5 3 on page 18 of this manual 5 4 REPLACEMENTS Replacements for the impedance matching network calibration load can be built with the following procedure The parts required to build these devices are listed on pages 17 and 18 2 Solder two SMC right angle pc board connectors HP part number 1250 0836 together as shown in figures 5 1 and 5 3 3 Cut the inside ground posts from the connectors 4 Solder the resistors to the center and ground posts as shown
3. Setup for Flatness Test with HP 3585A B Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Option K23 HEWLETT 03048 92036 7 Pick Ano Page 9 of 20 8 Set the DETECTOR POLARITY switch on the HP 3048 Opt K23 DC Blocking Filter to the POS position 9 Use the rotary knob on the HP 3585A B to position the cursor as close as possible tothe frequencies listed in table 3 1 Record the cursor level under the POS DETECTOR POLARITY in table 3 1 10 Set the DETECTOR POLARITY switch to the NEG position and repeat step 9 Record the results under NEG DETECTOR POLARITY in table 3 1 Table 3 1 Flatness Test Results from 100 kHz to 40 MHz RESULTS FREQ POS POS DETECTOR POLARITY POLARITY NEG DETECTOR POLARITY MHz LEVEL LOWER UPPER LEVEL LOWER UPPER dB LIMIT LIMIT dB LIMIT LIMIT 1 ae LL 1 1 WD 7 0 0 WWMM m 0 gt un un uo un cn C uw Cn Un Un U Un n on C Cn C C Q C Qn uo Cn Cn Cn Con Un LC Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 399220 U S A 3048A Option K23 jpg HEW
4. 1901 0080 1901 0880 1901 0731 1250 209 1250 209 1251 1998 1251 1998 1251 1998 Copyright 1988 24001 Mission Avenue cn Cn CO CO CO CO CO CO CO CO CJ www CO OD CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR DIODE GEN DIODE GEN DIODE PWR CONNECTOR CONNECTOR CONNECTOR CONNECTOR CONNECTOR HEWLETT PACKARD COMPANY TAF C 34 FXD 100UF FXD 100UF FXD 100UF FXD 100UF FXD 100UF FXD 100UF FXD 100UF FXD 100UF FXD 100UF FXD 100UF FXD 100UF FXD 100UF PRP 125MA PRP 125MA RECT 400V 75 10 75 10 75 10 75 10 75 10 75 10 75 10 75 10 75 10 75 10 75 10 75 10 DO 35 DO 35 1A 50VDC 50VDC 50VDC 50VDC 50VDC 50VDC 50VDC 50VDC 50VDC 50VDC 50VDC 50VDC RF SMA FEM PC 50 FR SMA FEM PC 50 SKT 025 IN BSC SZ SGL CONT SKT 025 IN BSC SZ SKT 025 IN BSC SZ SGL CONT SGL CONT Spokane Spokane Division AL AL AL AL AL AL AL AL AL AL AL AL WA 99220 U S A 3048A Opt ion K23 HEWLETT Va PACKARD 03048 92036 REFER HP PART QTY DESIG NUMBER 1251 1998 1251 1998 1251 1998 1251 1998 1251 1998 1251 1998 1251 1998 1251 1998 1251 1998 9135 0079 5041 0201 0757 0394 0698 7260 0757 0394 0757 0394 0757 0394 0757 0394 0757 0394 3101 2252 08640 20230 2200 0139 2200 0139 2200 0139 2200 0139 Page 15 of 2
5. 0 Replaceable Parts Table 4 1 DESCRIPTION 025 IN BSC SZ 025 IN BSC SZ 025 IN BSC SZ 025 IN BSC SZ 025 IN BSC SZ 025 IN BSC SZ 025 IN BSC SZ SKT 025 IN BSC SZ CONNECTOR SGL CONT SKT 025 IN BSC SZ INDUCTOR 100NH 5 5 2 6D MMX6 6LG MM PUSHBUTTON 1 4 CHINA WHITE RESISTOR 51 1 1 05W TF 0 100 NOT ASSIGNED RESISTOR 10K 1 05W TF 0 100 RESISTOR 51 1 1 05W TF TC 0 100 RESISTOR 51 1 1 05W TF 0 100 RESISTOR 51 1 1 05W TF 0 100 RESISTOR 51 1 1 05W TF TC 0 100 RESISTOR 51 1 1 05W TF 0 100 SWITCH PB DPDT ALTNG 4A 250 VAC FILTER HOUSING SKT SKT SKT SKT SKT SKT SKT CONNECTOR SGL CONT CONNECTOR SGL CONT CONNECTOR SGL CONT CONNECTOR SGL CONT CONNECTOR SGL CONT CONNECTOR SGL CONT CONNECTOR SGL CONT CONNECTOR SGL CONT O WO G2 C9 C9 C9 C9 G9 C9 C9 SCREW MACH 4 40 SCREW MACH 4 40 SCREW MACH 4 40 SCREW MACH 4 40 25 IN LG 25 IN LG 25 IN LG 25 IN LG PAN HD POZI PAN HD POZI PAN HD POZI PAN HD POZI IN LG PAN HD POZI IN LG PAN HD POZI 125 D HOLE NYL 125 0 NYL SCREW MACH 4 40 25 SCREW MACH 4 40 25 PLUG HOLE TR HD FOR PLUG HOLE TR HD FOR PLUG HOLE TR HD FOR 125 D HOLE NYL PLUG HOLE TR HD FOR 125 D HOLE NYL DC BLOCKING FILTER HOUSING COVER SPACER SPACER NUT RF CONN 1 4 36 THD 5 16 IN NUT RF CONN 1 4 36 THD 5 16 IN WASHER RF CONN WASHER RF CONN 2200 0139 2200 0139 6960 0016 6960 0016 6960 0016 6960 0016
6. 836 CONNECTOR RF SMC M PC 50 1250 1694 ADAPTER COAX STR F SMA F SMC 1250 1694 ADAPTER COAX STR F SMA F SMC Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Option K23 EAE 03048 92036 A RD Page 19 of 20 Po e og o TA E n4 2 gt d PCR gt 4 4 l DT 1 d i C 4 t 10 G nmn J abd CH Figure 5 5 Al Component Locator Diagram Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Opt ion K23 HEWLETT 77 03048 92036 PACKARD Page 20 of 20 lt FILTER SCHEMATIC 03048 62103 D x e u A1 DC BLOCKING FILTER 03048 62103 Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A
7. Avenue TAF C 34 Spokane WA 99220 U S A 3048A Option K23 h HEWLETT 03048 92036 2 Press the green PRESET key on the HP 3561A 3 Set up the HP 3561A as follows FORBAT iw ioa 1 aw 9 RC SINGLE 50 Hz SPAN FREQ AXIS to log TU TT eR UNIFORM CPC WIR PERIODIC NOISE 0 dB ATTEN wo vw ex 99 AUTO RNG off perform SINGLE AUTO RNG INFE 2879 CU C9 9 AUTO CAL off perform SINGLE CAL nnraca RMS DEFINE NUM AVGS 4 ENTER S ART a eucacekx ote eae moe e e ee start a measurement sweep 4 Wait for the HP 3561A to complete the sweep of 4 averages and then continue the setup of the HP 3561 as follows VENT SOALE CC SINGLE AUTO SCL aa yop ARE 248 STORE IN 1 o tma CERE NE cc MATH FCN SELECT MAG 1 VERE SUBE an t emo nico perform SINGLE AUTO SCL 2 dBV FULL SCALE 5 The trace should be a straight line in the center of the HP 3561A display Change VERT SCALE to 0 3 dBV FULL SCALE 6 Replace the calibration load with the DC Blocking Filter as shown in figure 3 4 and set the DETECTOR POLARITY switch to the POS postion 7 Press the START key on the HP 3561A and wait for completion of the measurement 8 Position the marker on the HP 3561A at each of the frequencies listed in table 3 2 by p
8. HP Archive This vintage Hewlett Packard document was preserved and distributed by www hparchive com Please visit us on the web On line curator John Miles KE5FX Uz HEWLETT PACKARD OPERATING AND SERVICE MANUAL MODEL 3048A OPTION K23 DC BLOCKING FILTER How To Use This Manual This Manua should be used in conjunction with the HP 3048A Operating Manual HP Part Number 03048 90001 printed March 1988 the HP 3048A Reference Manual HP Part Number 03048 90002 printed June 1988 and the HP 3048A System Calibration Manual HP Part Number 03048 90015 printed January 1988 Applicable Serial Numbers This Manual applies to instruments with serial number prefixes greater than or equal to 2820A Updates to this Manual Periodically changes are made to this Manual to correct errors in the original printing and to include Option improvements Corrections are indicated by a mark at the right hand edge of the modified text The mark used is keyed to the date the corrections are added found on this cover page below the issue date Operating and Service Manual Issued December 1988 HP Part Number 03048 92036 Updated June 1989 Updated April 1990 Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 2400 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Opt ion K23 HEWLETT h 03048 92036 PACKARD 2 of 20 1 1 INTRODUCTION This manual contains information required to insta
9. LETT 03048 92036 Page 10 of 20 6 PERFORMANCE TEST 2 1 HZ TO 50 HZ FLATNESS TEST DESCRIPTION This test measures the flatness of the HP 3048A Opt K23 from 1 Hz to 50 Hz with a HP 3561A A reference is taken with the HP 3561A Noise Source rear panel connected with a BNC cable to the impedance matching network and calibration load The calibration load output is connected to the HP 3561A input through a 50 ohm feedthru with a short cable After the reference trace is measured and stored in the HP 3561A s memory the reference load is replaced with the device under test DUT The results are then measured and recorded in table 3 3 EQUIPMENT 3561 IMPEDANCE MATCHING 03048 62015 LUN LORI Lo 20 0 9 999 546 06504451224 0800038 03048 62016 CALIBRATION CABLES 02 o o 0 05 0 00 05 0 0 4 465 0 0008 06584500054 03048 62017 50 0 0 0 0 0 0 0 9 0 0 9 0 0 6 6 5 0 0 0 0 0 0 0906 0 06094 0 00 0 0 HP 10100C CABLE 0 6 6 0 oe tostnt ost 995 8120 1840 BC PRE LOMA 59335 5 919 993 19 152 758 1250 0080 PROCEDURE 1 Connect the equipment as shown in figure 3 3 Figure 3 3 Setup for Reference Measurement with HP 3561A Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission
10. ain purpose is to make noise measurements on power supplies or any other baseband noise source that has a DC offset The DC Blocking Filter will enable the HP 3048A to have maximum dynamic range The HP 3048A has two methods of measuring baseband noise Noise Measurement Using the HP 3561A Only and Baseband Noise Measurement These methods are described in the HP 3048A Phase Noise Measurement System Reference Manual HP part number 03048 90002 Section 2 Measurement Definitions 2 1 CONNECTIONS Connect the output of the baseband noise source to the input of the DC Blocking Filter The output of the DC Blocking Filter is connected to either the NOISE INPUT of the HP 11848A or directly to the input of the HP 3561A The best results will be obtained when semirigid coaxial cables are used to connect the components used in the measurement and should be used whenever possible A equipment setup diagram is given for each type of baseband measurement that the HP 3048A can perform The setup diagrams for Noise Measurement Using the HP 3561A Only and Baseband Noise Measurement are shown in figure 2 1 and figure 2 2 respectively Table 2 1 gives the insertion loss and low frequency cutoff for each of these measurement types Table 2 1 HP 3048A Option K23 Insertion Loss and Low Freq Cutoff HP 3048A LOW FREQUENCY MEASUREMENT TYPE INSERTION LOSS CUTOFF Baseband Noise 6 0 dB typical 65 Hz typical HP 3561A Onl lt 0 25 dB typical 0 05 Hz typica
11. be used for comparison in periodic maintenance troubleshooting and after repairs 3 3 CALIBRATION CYCLE This instrument requires periodic verification of performance Depending on the use and environmental conditions the instrument should be checked using the following performance tests at least once every year 3 4 SPECIAL EQUIPMENT A calibration load and impedance matching network are required to run these Performance Tests One of each is supplied with the HP 3048A Opt K23 DC Blocking Filter Service information on these devices and an easy method to build replacements if the orginals are lost or damaged are given starting on page 16 of this manual 3 5 PERFORMANCE TESTING No abbreviation of the performance testing is recommended Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Option K23 HEWLETT h 03048 92036 7 9 PERFORMANCE TEST 1 100 KHZ TO 40 MHZ FLATNESS TEST DESCRIPTION This test measures the flatness of the HP 3048A Opt K23 DC Blocking Filter from 100 kHz to 40 MHz with a HP 3585A B A reference is taken with the HP 3585A B tracking generator connected by a short cable to the impedance matching network and calibration load The calibration load output is connected to the 50 ohm input of the HP 3585A B with a short cable Once the reference trace is measured and stored in the HP 3585A B s memory the ref
12. erence load is replaced with the device under test DUT The results are then measured and recorded in table 3 1 EQUIPMENT SPECTRUM AMALYZER wan ee ens RR REA sey EIS VP HP 3585A B IMPEDANCE MATCHING 22 eor e roo eros 03048 62015 CALIBRATION 5o te sas ntt ey hw 03048 62016 CALIBRATION CABLES 6 5 gt 5455 5 4 56 lt 03048 62017 PROCEDURE 1 Connect the equipment as shown in figure 3 1 Figure 3 1 Setup For Reference Measurement With 3561A Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Opt ion K23 HEWLETT 72 03048 92036 PACKARD Page 8 of 20 2 Press the green INSTR PRESET key on the HP 3585A B 3 Setup the HP 3585A B as follows NIE NAUES OFF SIANT FREU 100 kHz FREU IET 40 MHz P rac x 25 dBm 1 dB 4 The trace should be in the upper half of the HP 3585A B display Press the STORE A B key on the HP 3585A B 5 Press the A B key on the HP 3585A B to activate the trace 6 Turn off the B trace by pressing the VIEW B key on the HP 3585A B There should only be one trace on the HP 3585A B CRT and it should be a straight line in the middle of the screen 7 Replace the Calibration Load with the Opt K23 DC Blocking Filter as shown in Figure 3 2 Figure 3 2
13. in f gures 5 2 and 5 4 5 5 FUSES To protect the DC Blocking Filter from a large dc voltage at the input acts as a fuse If AIR is damaged AIR4 thru AIR8 are spares and be used to replace AIRI and AIR4 through AIR8 are inserted into sockets for easy removal and replacement Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A LA Packar R R2 R3 0698 7204 0698 7188 0698 7188 1250 0836 1250 0836 1250 1694 1250 1697 Copyright 1988 HEWLETT East 24001 Mission Avenue Table 5 1 Replacement Impedance Matching HP PART QTY NUMBER 1 9 3048A Opt ion K23 03048 92036 Page 17 of 20 Figure 5 1 Figure 5 2 Network Parts List DESCRIPTION RESISTOR 46 4 1 05W TF 0 100 RESISTOR 10 1 05W TF 0 100 RESISTOR 10 1 05W TF 0 100 CONNECTOR RF SMC M PC 50 OHM CONNECTOR RF SMC M PC 50 ADAPTER COAX STR F SMA F SMC ADAPTER COAX STR M SMA F SMC PACKARD COMPANY Spokane Division TAF C 34 Spokane WA 99220 U S A 3048A Option K23 HEWLETT 03048 92036 PACKARD Page 18 of 20 Figure 5 3 Figure 5 4 Table 5 2 Replacement Calibration Load Parts REFER HP PART QTY C DESCRIPTION DESIG NUMBER D RI 1 0 2 0698 7205 RESISTOR 51 1 1 05W TF 0 100 1250 0836 CONNECTOR RF SMC M PC 50 1250 0
14. is typically 6 0 dB when loaded by the 50 ohm input of the HP 11848A Phase Noise Interface The sWitch on the front cover can be set for either a positive or negative power supply 1 4 INITIAL INSPECTION Inspect the shipping container If the container and or packing material is damaged it should be kept until the contents of the shipment have been checked mechanically and electrically 1 there is mechanical damage or if the instrument does not pass the performance tests notify the nearest Hewlett Packard office Keep the damaged Shipping materials if any for inspection by the carrier and a Hewlett Packard representative 1 5 ACCESSORIES The accessories supplied with the HP 3048A Opt K23 are listed below IMPEDANCE MATCHING NETWORK am a oot m ha 5569 03048 62015 Ks P H 03048 62016 CALTRRATIUN CABLES eso nsnm 03048 62017 ADAPTER SHALE TOSI 91 eouenasoitirm e morcm bom 9D 1250 1694 BUAPTER SMADO c main 1250 1697 ADAPTER RT ANGLE SHACK TO eno oon imm reimtm lt lt 1250 1397 Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Option K23 HEWLETT 72 03048 92036 PACKARD Page 4 of 20 SECTION II OPERATION 2 1 APPLICATIONS The HP 3048A Opt K23 DC Blocking Filter s m
15. l Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 7 HEWLETT 3048A Opt ion K23 PACKARD 03048 92036 Page 5 of 20 ANALYTER _ 2 Lat id E OURCE Pa 7 5 yen 23 DC E A Figure 2 1 AM AL ANA Ro porre eater ttr 845A T NO q INTERFACE o LJ um ow d m Y n A AA m 7 Figure 2 2 Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Opt ion K23 HEWLETT 03048 92036 Pace 6 of 20 SECTION III PERFORMANCE TESTS 3 1 INTRODUCTION The procedures in this section test the instrument s electrical performance using the specifications of table 1 1 as performance standards 11 tests are performed without accessing the interior of the instrument NOTE For greatest accuracy allow the test equipment to warm up at least one half hour 3 2 PERFORMANCE TEST RESULTS Results of the performance tests may be tabulated in the Test Results Tables at the end of each procedure The Test Results Tables list all of the tests specifications and acceptable limits The results recorded at incoming inspection can
16. ll operate and service the Hewlett Packard Model 3048A Option K23 DC Blocking Filter an optional accessory for the HP 3048A Phase Noise Measurement System The DC Blocking Filter Operating and Service Manual has five sections The subjects addressed are SELTIUN eee eee eres ery GENERAL INFORMATION SEGTIUON t 92s aco os o OPERATION SECTION oe oett PERFORMANCE TESTS SECTION REPLACEABLE PARTS SECTIUM aene euo sott rrt mmm SERVICE 1 2 SPECIFICATIONS Instrument specifications are listed in table 1 1 These specifications are the performance standards or limits against which the instrument may be tested Table 1 1 Specifications __ CHARACTERISTICS PERFORMANCE LIMITS CONDITIONS MAXIMUM INPUT DC 30 V 0 5 dB 5 Hz to 40 MHz FLATNESS Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Opt ion K23 HEWLETT 03048 92036 UA PACKARD Page 3 of 20 1 3 DESCRIPTION The HP Model 3048A Option K23 DC Blocking Filter is an accessory to the HP 3048A Phase Noise Measurement System It contains a blocking capacitor designed to allow noise measurements on power supplies with the HP 3048A The insertion loss of the DC Blocking Filter
17. ressing MKR DEFINE MKR POS frequency to be measured in hertz and Hz on the HP 3561A Record the marker level for each frequency under POS DETECTOR POLARITY in table 3 2 Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A Uz 3048A Option K23 HEWLETT 03048 92036 PACKARD Page 12 of 20 9 Set the DETECTOR POLARITY switch to the NEG position Repeat steps 7 and 8 Record the results under NEG DETECTOR POLARITY in table 3 2 Figure 3 4 Setup for Flatness Test with HP 3561A Table 3 2 Fiatness Test Results from I Hz to 50 Hz MEASURED RESULTS POS DETECTOR POLARITY NEG DETECTOR POLARITY LEVEL LOWER UPPER LEVEL LOWER UPPER 48 LIMIT LIMIT dB LIMIT LIMIT dB dB dB dB Copyright 1988 HEWLETT PACKARD COMPANY Spokane Division East 24001 Mission Avenue TAF C 34 Spokane WA 99220 U S A 3048A Opt ion K23 h HEWLETT 03048 92036 PACKARD Page 13 of 20 PERFORMANCE TEST 3 DC LEAKAGE TEST DESCRIPTION This test measures the leakage current of the capacitors in the DC Blocking Filter 30V supply is applied to the input The output is connected through a 50 ohm feedthru to the input of a voltmeter The voltage dropped across the 50 ohm feedthru is measured to determine the leakage current EQUIPMENT tho HP 3478A PUNEN SUPPLY HP 6205B 50 0HM
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3048A_Option_K23_DC Block Filter