phillips_pm 3323 - Micro Precision Calibration
Contents
1. PM 3320Aa amp PM 3323 applies to both channels simultaneously and synchronously It offers a full 2 ns resolution for each channel for repetitive signals and single events And random sampling permits the use of higher time base speeds for repetitive signals so that the full 300 MHz of the instrument can be used and stored Each channel is also provided with a dual fast peak detector which permits the capture of events down to 3 ns even when siow time base speeds are used This is not only useful to catch short glitch type signals over longer time windows it also allows the instru ment to accurately digitize and display high fre quency signals which are modulated in ampli tude by a lower frequency without aliasing For the slowest of signals a roll mode is provided The roll mode can be triggered if desired to stop at any significant signal detail Triggering and Delay Capabilities The PM 3323 or PM 3320A can be triggered from a choice of internal and external signal sources Pre trigger of up to one full screen is possible not only in the direct acquisition modes but also at the higher time base speeds thanks to the instrument s random sampling technique Extensive post trigger recording with delays of up to 1000 screen lengths permits analysis of small signal details out of long and complex signals In addition the RESTART function which enables the user to quickly zoom in on a point of interest make analysis2. With compliments fon 49 241 155 315 Feldchen 16 24 D 52070 Aachen Helmut Singer Elektronik www helmut singer de info helmut singer de fax 49 241 152 066 Germany PM 3323 Up to 300 MHz Bandwidth a8 250 MS s or 500 MS S sampling rate onteach channels PM 3323 300 MHz 500 MS s Digital Storage Oscilloscope PM 3320A 200 MHz 250 MS s D igital Storage Oscilloscope Me es BAST 2ns on4 nsisingle shot resoltitionionmeach channel sae make sober Aeau x y 10 bitvertical resolutions Fo r4kdeep memoriess Horizontal expansion of up to 64 times n ae res Automatic cursor positioning and measurements of amplitude time frequency and phase ee eae ees x he ES By iw Signal processing including algebraic functions FET andihistogram lt Extensive Acquisition and Display Functions The PM 3323 and PM 3320A have extensive acquisition calculation and display functions to capture exactly the signals of interest and quickly extract the information and measurements re quired Both models offer an absolute min max mode envelope mode that creates a cumula tive record of signal amplitudes over the measur ing period Also available are stop on difference and save on difference modes These allow signals outside a predetermined band to be Captured after which acquisition either stops stop on difference or continues after saving the waveform
3. All that s necessary is to locate the cursors around the area of interest and press the Restart key A new acquisition is made at a higher sampling rate so that the area of interest fills the full screen al Storage sCIOscopes Vertical signal processing includes averaging andwidth limit and MIN MAX incorporating a fast Track nd Hold circuit in each channel to reveal spikes or itches down to 3 ns evenatiow timebase speeds This cility also enables accurate display of HF signals hich are LF amplitude modulated without aliasing 8 Muse ly LET A M AF POS AGE FESHI The running average not only reduces random noise it allows the user to get the most out of the 10 bit solution even at the full bandwidth a2s 8 oe 1oV1 i e0 Biv Signals from each channel can be stored in each of four 4k deep memories along with all the relevant setting parameters PEAK on 5 68 7 JIia PEAKS V aie Jlis dy 39 06 6 The envelope mode makes it easy to track signal variations over time for example changes caused by temperature drift interference stability problems etc 2ps REL AUTO Dv sA 3 85 13 7 Builtin envelope functions provide a powerful capability for the testing of components or assemblies With Stop on Difference items not conforming to specification are easily identified 8 As should be expected of any high performance DSO a wide range of measuring facilities are
4. PROB HIGH the voltage level that corresponds with the upper flat part of a pulse The two PROB reference levels are derived from the amplitude histogram of the signal being measured This eliminates the influence of over shoot preshoot and ringing on time measure ments derived from these amplitude levels These reference levels define the 0 and 100 values for cursor positioning The cursors can then be automatically placed at any value between 50 and 150 relative to these reference levels Cursors can also be used as Smart Start cur sors When the cursors are placed over any signal detail of interest the activation of Re Start automatically reestablishes proper delay and sampling speed to acquire that detail with maximum resolution Advanced Signal Processing Modes The PM 3323 and PM 3320A offer more than signal measurements alone A wide range of signal processing modes allow you to explore more deeply into your acquired signals and perform caiculations that reveal hidden data and relationships The basic arithmetic functions of add subtract multiply and divide are supple mented by signal differentiation and integration as well as amplitude histograms the application of digital filters and an optional FFT facility for signal representation and analysis in the fre quency domain System Use The interface option on both modelis offers full GPIB IEEE 488 and RS 232C capabilities All controls can be
5. adjustable between 20 ms 2 sec per dot General Specifications Power Supply Nominal AC Voltage Range 100 240 V Nominal Frequency 50 Hz 400 Hz Power Consumption With options 170 W nomi nal Memory Backup for Settings and Traces Two rechargeable batteries are supplied with the instrument Retention Time 8 weeks recharged when in strument is powered Mechanical Data Height 176 mm 6 9 in 250 mm 9 8 in with feet and pouch 4E 7 inch in 19 inch rackmount version Width 419 mm 16 5 in 465 mm 18 3 in with handle Depth 570 mm 22 5 in 670 mm 26 4 in with handle extended Weight 18 kg 39 6 Ib exci accessories Environmental Characteristics Meets environmental requirements of MIL T 28800C Type Ill Class 5 Style D Temperature Operating 0 C 50 C Storage 40 C 70 C Maximum Humidity 95 relative humidity Maximum Altitude Operating 4 5 km 15 000 ft Non operating 12 km 40 000 ft Vibration Frequency 5 55 Hz 15 minutes along each of the 3 axes with a maximum acceleration of 3 g Resonance dwell of 10 minutes at each frequency where resonance occurs or at 33 Hz when no resonance found Shock Operating and non operating Max ac celeration 30 g 1 2 sine 11 ms duration 6 shocks on each axis 3 shocks on each face giving a total of 18 shocks Bench Handling MIL STD 810 method 516 procedure V EMI MiL STD 461 Class B VDE 0871 and VDE 0875 Safety The instrument meet
6. fast and simple and provide a better alternative to the traditional Delayed Sweep arrangement Trigger level can be checked in the CRT display for fast setup for all selected trigger sources whether internal or external in addition to normal trigger deiay the delay can also be used to give an internal time delay after an external event Both models also offer excellent TV trigger capabilities See also PM 8917 Storage Signals from each channel can be stored in each of four 4k memories This allows for easy comparison of waveforms or the display of ref erences A unique multipie single shot mode allows for quick and automatic storage of up to four dual channel acquisitions which occur rapid succession All waveforms are kept with all rele vant acquisition parameters such as sensitivity time base and delay settings at the moment of recording A real time clock provides automatic time stamps Full compatibility with GPIB IEEE 488 and RS 232C enables almost unlimited recording of waveform data on external devices Display and Soft Keys The PM 3323 and PM 3320A have a large 10 x 12 cm CRT screen The center 8 x 10 cm area is exclusively used for waveforms The edges of the screen the show acquisition parameters of live cinmale ar af nravianehs eaancdad PM 3320A 62M 3323 Peni forms This clear separation of signal traces and parameters eases interpretation of results All softkey displays are to t
7. min max 5 ns div 5s div Stop save on difference 5 ns div 5s div Error Limit in equivalent time mode 1 0 In real time mode 0 01 Save Stop on Difference Time between end of last comparison and ready for next 100 150 ms dependent on memory resolution Absolute Min Max Auto resets after 100 ac quisitions or after 10s whichever occurs last can be switched off Triggering Sources ChA ChB External Line and External events Ext Input Impedance 1 MQ in parallel with 14 pF Ext Maximum Input Voltage 300V AC DC peak at 1 MHz Coupling Signal triggering AC DC LF rej HF rej Auto level or TVF Events triggering TTL ECL or adjustable voltage Triggering Sensitivity mera Enema osa som Slope Positive negative or dual siope Level Range Channel A and B 8 div External 0 8V External 10 8V Any source in AUTO related to p p value Frequency Range Trigger coupling in DC DC 300 MHz Trigger coupling in AC 10 Hz 300 MHz rigger coupling in LF rej 50 kHz 300 MHz Trigger coupling in HF rej DC 50 kHz Trigger Delay Range PM 3323 10 9999 divisions 100 ns div 360s div 10 500 divisions 5 ns div 50 ns div PM3320A 10 9999 divisions 200 ns div 360s div 10 500 divisions 5 ns div 100 ns div 1 9999 events max frequency 5 MHz Internal delay after event count 30 MHz 100 MHz _ 300 MHz Memory 4 memories of 4k x 10 bit wor
8. set or read Waveform data can be taken from any of the four memories or be sent back to the scope for example when load ing a template for the stop on difference mode All 250 user defined setup memories can be set by the controller as well as called by the control ler This drastically reduces bus traffic and sig nificantly speeds automatic testing applications Hard Copy Each model is equipped with an analog output to drive an analog XY recorder The operator can select any waveform in any memory to be drawn by the recorder Instruments equipped with the interface option provide direct output to plotters or printers A digital plot or print __ _ any waveform is possible along with aiphanu meric data pertinent to that waveform Construction The sturdy construction provides for a variety of operating configurations At just under 18 kg it can easily be carried from one location to an other and the carrying handle doubles as an adjustable stand Scopecart PM 8991 04 offers further mobility In addition a rackmountable version for use in standard 19 inch racks is also available A iye 20 20 gt o o oc Somer 8 E A iy GF 2 1 The PM 3323 and PM 3320A screen is a complete information center Because of the 10 x 12 cm screen size and full 8 x 10 cm dedicated trace area no text is interfering with the displayed waveforms AV 25 REC TD Gv O IV 78 2 Restart allows fast zoom in on signal datail
9. dowing rectangular Hamming or Hanning and linear or logarithmic scaling gives fast calculation and display of the power spectra in the frequency domain Specifications Technical Specifications Unless stated all specifications refer to both PM 3323 and PM 3320A CRT Philips 180 mm rectangular tube with 16 kV acceleration potential and P31 phosphor GH 100 mm x 120 mm useful screen area 80 mm x 100 mm for traces Readout Three separate areas reserved for front panel setting information register parame ters on softkey menus Graticule Internal with indications Illumina tion continuously variable Autoset Sets display text vertical mode horizontal mode and trigger coupling in a predefined position Other parameters depending on signal so that available signals are correctly recorded and displayed Signal Acquisition Sampling Type Real time PM 3323 100 ns div 360s div PM 3320A 200 ns div 360s div Equivalent time PM 3323 5 ns div 50 ns div PM 3320A 5 ns div 100 ns div Maximum Sample Rate Real time PM 3323 500 MS s PM 3320A 250 MS s Equivalent time 10 GS s External clock 50 kS s Vertical Resolution 10 bits or 0 1 of full scale Voltage resolution 50 uV Maximum Horizontal Resolution Single channel single shot PM 3323 100 ns div 500 ps div 512 samples acquisition 1 ms div 360s div 4096 samples acquisition PM 3320A 200 ns div 500 us div 512 samples acquisition 1 ms di
10. ds each Display Sources Register RO R1 R2 or R3 in any combination Expansion Horizontal In steps 1x 64x 8x in A vs B Continuously between 1x and 2x Vertical 0 2x 1x and 5x Display Handling Smoothed Dots only Dot join All registers can be inverted Position 5 div horizontally and vertically from screen center for each register and or individual trace Setting Memory Memory Size 251 front panel settings maxi mum Functions SAVE INSERT or DELETE for stor age or erasure of settings RECALL NEXT or PREVIOUS for recall of programmed settings Configuration Front panel settings can be grouped as main and sub settings in order to reach up to 10 closed sequences each with an own number of steps Calculation Functions All waveform calculations can be performed with results stored in different registers from source register Original waveform need never be af fected Add Subtract Multiply Divide Differentiate Integrate Delay channel Amplitude histogram Digital filter FFT optional Digital Filter Breakpoint related to filter order and TB by 0 72 N 1 f sample where N filter order and f sampie sample rate dependent on TB 10 memory depth FFT option Range of amplitude display 49 8 dB Positive spectrum display resolution 2000 points single channel 1000 points dual channel Frequency resolution related by TB 10 24 DC point is mid memory FFT Windowing Rectangular Hanning
11. est These instrument setups can also be linked together to form sequences of test steps or can be recalled at random Versatile Measurement Functions Once a signal has been acquired a full range of measurement and calculation functions to extract exactly the information needed from the signal are available Measurements of voltage and time differences between the cursors posi tioned on a single waveform are possible In addition comparative measurements to be made between two waveforms recorded on channel A and channel B or between separate waveforms stored in any of the instrument s four memory ragisters Not only absolute and relative time and voltage measurements are possible but also phase measurements In each case all that s necessary is to position the cursors on the de sired part of the signal or signals concerned make a simple menu selection of the required measurement and the numeric result is immedi ately displayed on screen To enhance and quicken specific application measurements the PM 3323 and PM 3320A also offer full automatic cursor positioning In this mode the cursors are automatically positioned with respect to user defined reference levels The choice of refer ence levels are MIN PEAK the most negative signal value measured MAX PEAK the most positive signal value meas ured ABS VOLT an absolute voltage level set by the user PROB LOW the voltage level that corresponds with the lower flat part of a pulse
12. he right of the display and adjacent to the softkeys A separate numeric keypad allows direct input of pertinent data such as offset and delay Operation and User Friendliness All main functions are directly accessible to the user without the need to learn soft key menus This also eliminates the time consuming need to back up through various levels of menus to change instrument settings And Philips Green button Autoset provides for even faster set ups by automatically determining the optimum ac quisition parameters for any input signal This is a great help in finding and viewing unknown signals Once captured waveforms are immedi ately displayed and without interference from text or menus All texts are displayed along the screen edges with only channel identification A or B displayed with the relevant trace The PM 3323 and PM 3320A even show a warning when aliasing due to undersampling is detected The logical front panel layout follows the traditional concepts of clearly grouping input channels time base functions and trigger functions This logical approach makes the use of this advanced DSO possible right from the start SetUp Memories Both models have user programmable setup feature allows even greater ease of use provid ing automation without a computer This en sures repeatability of tests and their results Up to fully 250 user defined instrument setups can be stored for measurements of user specific inter
13. in a register save on difference In both cases the signals are time and date stamped to help relate intermittent faults to possible exter al causes In combination with the other acqui sition modes such as pre and post triggering offset and restart the PM 3323 and PM 3320A offer exceptional versatility in capturing and analyzing exactly the signal of interest A com plete measurement center in one unit Inputs and Signal Acquisition The PM 3323 and PM 3320A have the power and versatility to cover a wide range of applica tions Two signal inputs are provided each with a choice of 1 MQ or 50Q input impedance The built in 50Q terminations are protected against damage through overloads by a combination of software and thermal protection Calibrated voltage offset of up to 1000 x each input sensitivity permits the full utilization of the instrument s 10 bit vertical resolution even when examining small signals present on large DC offsets Even if the magnitude of this DC offset is unknown the PM 3323 or PM 3320A can make the compensation automatically using their AUTO OFFSET facility To enable accurate measurements on noisy signals which is often the case with high bandwidth low level signals the averaging mode is indispensable The aver aging mode reduces the noise drastically ena bling a clean display to be achieved even at the highest sensitivities Further the PM 3323 s fast 500 MS s sampling rate 250 MS s on PM 3320A
14. l poll PPO No parallel poli Device clear DC1 Complete capability Device trigger co No controiler Default address 8 RS 232C Connector RFI EMi shielded 25 pole Bus drivers Data circuits Spacing 0 3V Marking 1 3V TxD and RxD lines Control circuits ON 3V OFF 3V RTS CTS DSR and DTR lines Current Output 10 mA Impedance Output 3009 Input 3 k 7 k Voltage Output 7V 7V Input 25V 25V Interface Functions Baud rate 75 110 150 300 600 1200 2400 4800 9600 or 19200 input and output sepa rately selectable Stop bits 1 or 2 Parity odd even or none Length 7 or 8 bits Transmission mode Asynchronous full duplex Handshake Software XON XOFF Hardware DSR DTR and CTS RTS Serial Poil ESC 7 PM 3320A amp PM 3323 Go to Remote ESC 2 Go to Local ESC 1 Device Clear ESC 4 Device Trigger ESC 8 Digital Plot option 40n and 80n Language Selectable HPGL or Philips GL de pendent on plotter type Plotter select Philips PM 8153 1 PM 8153 6 PM 8154 PM 8155 HP 7450 HP 7475A Pen select Pen 1 for ChA Pen 2 for ChB Pen 3 for Register ChA Pen 4 for Register ChB Pen 5 for graticule and alphanumerics Plot area Softkey selectable Dot Matrix Printer Screen Dump Compatible with Epson FX 80 and HP Thinkjet Drawing Area 10 cm x 10 cm Analog Plot Output Screen dump or register dump possible Output voltage 1V horizontal and vertical 3 Pen lift TTL compatible Plot time
15. m 8 ft PM 8929 391 10 1 Probe with readout cable length 1 5 m 5 ft PM 8931 091 20 MQ 100 1 Probe with readout cable length 1 5 m 5 ft PM 9599 091 Set of VHF Attenutators Active Probes PM 8940 09n High Voitage Isolation Amplifier with readout PM 8943 00n 650 MHz FET Probe PM 9355 09n AC Current Probe with readout Other Accessories PM 8917 00n Video Line Selector PM 8956A 001 Retrofittable IEEE 488 GPIB and RS 232C interface PM 8992 801 Accessory Pouch PM 8991 041 Oscilloscope Cart PM 9051 001 BNC to 4 mm Banana Adapter PM 2122 01 50Q Coaxial Switch PM 2195 09 Probe Switch 400 MHz PM 2230 001 Series Instrument Drivers Software PM 2240 001 TestTeam Software PM 2260 001 Oscilloscope Signal Processing Software For full details of all accessories see page 44
16. offered Absolute ground referenced results are achieved on up to two traces selectable from any of the 8 displayable waveforms PM 3320A amp PM 3323 9 Together with the cursor measurements on a single trace selection can be made from a wide variety of automatic and calculated results Amplitude measurements of RMS mean peak peak pulse overshoot and preshoot can be readily selected 10 Further time measurements of frequency period pulse width duty cycle and rise time are available to give timer counter results Even phase can be measured between channels and or waveforms 11 The basic arithmetic operation add subtract multiply and divide can be performed on captured waveforms allowing quick convenient calculations 12 A further example of the math facility integrate seen here as the integral of the signal between the cursors A convenient display for use in energy Measurements for example 13 Further processing gives a new dimension to single shots buried in noise These signals unlike repetitive waveforms that can be averaged if noise exists are once off and average cannot be used With the PM 3323 s or PM 3320A post acquisition filtering the true signal can be revealed Ps a A A 14 23 istir 9 2 8 ASIH and 13 4 B49 908 ROBE URAL oe REGI is result of FOURTER TRYSFORN function 93 12 1 FRB HRA coz 06 40 12 REUS 14 The optional FFT function with selectable win
17. or Hamming with linear or logarithmic vertical scal ing FFT Calculation Time No windowing linear display 6 secs windowing and logarithmic dis play 15 secs Cursors Max Horizontal Resolution Singie channel mode 1 4096 Dual channel mode 1 2048 Vertical Resolution 1 1024 Read Out Resolution 3 digits Error Limit lt 2 of voltage lt 0 2 of time Range Visible part of signal Readout on screen V1 V2 dV T1 T2 dT 1 dT Positioning Time voltage relative voltage References for Relative Voltage cursors MIN PEAK MAX PEAK PROB HIGH PROB LOW GND ABSolute VOLTage Measurement Capabilities dV dt RMS 1 dt Max Rise fall Min Rise fall ECL Overshoot Rise fall VAR Preshoot Frequency Mean Period Absolute volts Pulse width Volts Ch Ch Duty cycle Volts Reg Reg Phase Relative time Time Ch Ch Relative voits Time Reg Reg Calibration Output Output voltage 1 Vp square wave Frequency 2 kHz Internal impedance 50Q Output current 20 mA Interface optional Interface board contains IEEE 488 interface RS 232C interface and a real time clock EEE 488 Bus driver E2 Three state Interface Functions Source handshake SH1 Complete capability Acceptor handshake AH1 Complete capability Taiker TS Basic talker Serial poll Talk only and Unaddress if MLA Listener U3 Basic listener Listen only and Unaddress if MTA Service request SR1 Complete capability Remote slocal RL2 No local lock out Paralle
18. s the requirements of IEC 345 class 1 VDE 0411 class 1 UL 1244 and CSA 5568 Included With instrument 2 10 1 passive probes Blue contrast filter Operating Manual 2 rechargeable penlight batteries reply card for free Service Manual Ordering Information Model PM 3323 00n 300 MHz 500 MS s Digital Storage Oscilloscope PM 3320A 00n 200 MHz 250 MS s Digital Stor age Oscilloscope Note n defines the power cord option Optional Configurations When ordering select basic PM model and substitute the configuration option number listed below as a suffix PM 332 1n Adds FFT Option to any configura tion PM 332 3 n Adds 19 inch Rackmount only PM 332 4 n Adds IEEE 488 RS 232C Interface Option only PM 332 8 n Adds Rackmount and IEEE 488 RS232C interface option Example Ordering Configuration To order a 300 MHz 500 MS s Digital Storage Oscilloscope with rackmount and FFT select Basic model PM 3323 00n Rackmount only PM 3323 3 n FFT option PM 3323 1n 110 V Power cord option PM 3323 3 Complete mode number PM 3323 313 Accessories Passive Probes PM 8911 091 5000 10 1 Probe with readout cable length 1 5 m 5 ft PM 8912 091 5 kQ 100 1 Probe with readout cable length 1 5 m 5 ft PM 8924 001 1 1 Probe cable length 1 5 m 5 ft PM 8924 201 1 1 Probe cable length 2 5 m 8 ft PM 8929 191 10 1 Probe with readout cable length 1 m 3 ft PM 8929 291 10 1 Probe with readout cable length 2 5
19. t 200 MHz Maximum Input Voltage High Z 300V OC AC peak at 1 MHz Maximum Input Voltage 509 5V DC and r m s 50 V AC peak Protected against selec tion with unsafe voltage on input connector Deflection Coefficients 5 mV div 5V div in 1 2 5 sequence Continuous control between steps Error Limit Variable Calibrated Overall 2 Add 2 in min max mode and in 100 ns div range Dynamic Range 10 divisions DC Offset es oe mVidiv 20 mV div 50 mV div 200 mV div 500 mVidiv 5V div Shift Range 5 divisions Frequency Response PM 3323 OC 300 MHz 3 dB PM 3320A DC 200 MHz 3 dB AC coupled lower 3 dB point with 509 input 10 Hz AC coupled lower 3 dB point with high Z input 1 Hz Bandwidth limiter reduces bandwidth to 20 MHz Risetime 0 35 Bandwidth PM 3323 1 16 ns PM 3320A 1 75 ns CMRR 100 1 at 1 MHz 20 1 at 50 MHz MIN MAX Function Accuracy for pulse longer than 3 ns is 50 Reset time 20 ns Average Continuous average where New Sample Old Value Constant And constants 32 x in roll mode 2 64 x in other modes New Value Old Value Time Base Modes and Time Coefficients Recurrent 5 ns div 5s div Single shot PM 3323 100 ns div 5s div PM 3320A 200 ns div 5s div Single scan 5 ns div 5s div Multiple shot PM 3323 100 ns div 5s div PM 3320A 200 ns div 5s div Multiple scan 5 ns div 5s div Roll 50 ms div 360s div Absolute
20. v 360s div 4096 samples acquisition Single channel repetitive or single scan PM 3323 5 ns div 50 ns div 512 samples acquisition 100 ns div 360s div 4096 samples acquisition PM 3320A 5 ns div 100 ns div 512 samples acquisition 200 ns div 360s div 4096 sampies acquisition Dual channel single shot PM 3323 100 ns div 500 us div 512 samples acquisition 1 ms div 360s div 2048 sampies acquisition PM 3320A 200 ns div 500 us div 512 samples acquisition 1 ms div 360s div 2048 samples acquisition Dual channel repetitive or single scan PM 3323 5 nsidiv 50 ns div 512 samples ac quisition 100 ns div 360s div 2048 samples acquisition PM 3320A 5 ns div 100 ns div 512 samples acquisition 200 ns div 360s div 2048 samples acquisition Acquisition Time Real time 10 24 x time divi sion exclusive delay time Equivalent time 2s for 5 ns div input signal dependent 10 ms for 100 ns div 99 probability of all samples being updated Sources ChA ChA ChB ChB Modes ChA ChB ChA and ChB ChA ChB ChA ChB ChB ChA ChA ChB Average and MIN MAX possible in all modes Sample Difference Between ChA and ChB Both channels are sampled simultaneously 200 ps Acquisition Processing Absolute min max envelope Averaging Save on difference Stop on difference Channels A and B Input Impedance High Z 1 MQ in parallel with 14 pF input Impedance 509 V S W R 1 2 1 a
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