HP 54721A User's Manual
Contents
1. t Channel output Channel outpu De ZEG Getting the best performance from the plug in To obtain the 1 percent dc accuracy specifications you must perform a best accuracy calibration Also when you move a plug in from one slot to another slot you must repeat the best accuracy calibration to retain the 1 percent accuracy specifications See Calibrate to Best Accuracy on page 17 The best accuracy calibration also performs the sampler interleave calibration which must be performed for the plug in to function correctly at 4 GSa s Installing the plug in You do not need to turn off the mainframe to install or remove any plug ins and you can install a plug in into any slot on the HP 54720 mainframe However on the HP 54710 mainframe only slots 1 and 2 have channel acquisition hardware but you can still use slots 3 and 4 as trigger sources You can install this plug in in slots 1 and 2 2 and 3 or 3 and 4 To make sure that the oscilloscope meets all of the published specifications there must be a good ground connection from the plug in to the mainframe The RF connectors on the rear of the plug in are spring loaded so finger tighten the knurled screw on the front panel of the plug in to make sure that the plug in is securely seated in the mainframe Trigger menu You may notice a couple of differences in the trigger menu on the mainframe when you are using this plug in The external trigger level range for this plug in is2. Front panel of the plug in The plug in takes up two mainframe slots You are trading channel count for increased sample rate increased record length and increased single shot bandwidth The front pane of the plug in has a channel input an external trigger input and a calibration output signal The calibration signal has a pulse width of about 500 ps which is used for performing a best accuracy calibration on the plug in The front panel also has two probe power connectors for HP 54700 series probes and one hardkey that brings up a softkey menu on the display The softkey menu allows you to access to the channel features of the plug in HP 54721A Fa AMPLIFIER f 4 Er i dc 60 9 5 Vime Max ka ac k o 250 Vdo Max Prabe power Rear panel of the plug in The rear panel has both internal and external trigger output signals One digital interface connector that has the control signals for the attenuator ranges channel setup hardkey softkey selections and power supply lines You may notice that there are two channel output connectors The 4 GSa s sample rate is achieved by interleaving two sampler hybrids inside of the mainframe There is a channel output for each of the two hybrids and that is why the plug in takes up two slots on the mainframe External trigger output internal trigger output Digital interface and power supplies oco ce gcco pose a coaqoocvuce aud
3. 1 V Also the trigger source selection follows the slots that the plug in is installed in For example if the plug in is installed in slots 2 and 3 then the internal trigger source is listed as channel 2 and the external trigger source is listed as trigger 3 wal In this book This book is a User s Reference for the HP 54721A Amplifier Plug in The book contains three chapters Chapter 1 Channel Setup Menu takes you through the channel setup menu and gives you a description of each softkey Chapter 2 Specifications and Characteristics lists the system specifications and characteristics of this plug in when it is combined with a mainframe Chapter 3 In Case of Difficulty gives you a few simple checks that you can make in case the plug in does not appear to be operating properly For HP IB programming information refer to the Programmer s Reference supplied with the mainframe and for service information refer to the Service Guide Contents Channel Setup Menu Display 12 Scale 12 Offset 13 Input 13 Output 13 Probe 14 Calibrate 17 Specifications and Characteristics Specifications 22 Characteristics 23 General Characteristics 26 In Case of Difficulty If the mainframe does not power up 28 If the plug in does not operate correctly 29 Error messages 30 Glossary 33 Index 35 Channel Setup Menu Figure 1 Channel Setup Menu At the top of th
4. 2 Pressthe System config softkey The calibration status of the plug ins is listed near the bottom of the display in the box entitled Plug ins If the model number of the plug in is listed next to the appropriate slot number then the mainframe has identified the plug in If all of the above steps check out okay and the plug in still does not operate correctly then the problem is beyond the scope of this book Refer to the Service Guide or return the plug in to your service department If known is displayed instead of the model number of the plug in then remove and reinsert the plug in in the same slot If known is still displayed then the memory contents of the plug in are corrupt Refer to the Service Guide or contact your service department 29 In Case of Difficulty Error messages Error messages The following five error messages are for the plug in Typically the error messages indicate there is a problem with either the plug in or the mainframe This section explains what the messages mean and offers a few suggestions that might help resolve the error condition If the suggestions do not eliminate the error message then additional troubleshooting is required that is beyond the scope of this book Refer to the Service Guide that is supplied with the plug in and the mainframe for troubleshooting information Additional error messages are listed in the User s Reference for the mainframe Error message Memory
5. Accuracy Best Accuracy calibration only Single Marker gain accuracy offset accuracy Dual Marker gain accuracy 2 x resolution Input Resistance 50 0 1 5 Trigger Sensitivity 2 High Sensitivity 0 1 div at 100 MHz 0 3 div at 1 GHz Normal Sensitivity 0 5 div at 100 MHz 1 5 div at 1 GHz Noise Reject 1 div at 100 MHz 3 0 div at 1 GHz Minimum Pulse Width at Normal Sensitivity lt 500 ps at gt 1 div Trigger Sensitivity High Sensitivity 6 mVp p at 100 MHz 20 mVp p at 1 GHz Normal Sensitivity 30 mVp p at 100 MHz 90 mVp p at 1 GHz Noise Reject 60 mVp p at 100 MHz 150 mVp p at 1 GHz Minimum Pulse Width at Normal Sensitivity lt 500 ps at 260 mVp p 22 Interleave Cal Output Channel Specifications and Characteristics Characteristics Pulse Width FWHM 475 ps Frequency 152 1 MHz 0 05 1 Best Accuracy Cal specifications apply for 24 hours to plug ins that are calibrated with Best Accuracy Cal and remain in the same slot Otherwise normal accuracy characteristics apply Best Accuracy Cal specifications are valid within 5 C of the best accuracy Calibration temperature while also within 5 C of the mainframe calibration temperature 2 Characteristics apply to full resolution channel scales Use the next lower full resolution sensitivity for intermediate channel scale settings Characteristics The following characteristics are typical for the HP 54721A plug in See the HP 54701A Active Probe Service Guide
6. Safety This apparatus has been designed and tested in accordance with IEC Publication 348 Safety Requirements for Measuring Apparatus and has been supplied in a safe condition This is a Safety Class I instrument provided with terminal for protective earthing Before applying power verify that the correct safety precautions are taken see the following warnings In addition note the external markings on the instrument that are described under Safety Symbois Warning e Before turning on the instrument you must connect the protective earth terminal of the instrument to the protective conductor of the mains power cord The mains plug shall only be inserted in a socket outlet provided with a protective earth contact You must not negate the protective action by using an extension cord power cable without a protective conductor grounding Grounding one conductor of a two conductor outlet is not sufficient protection e Only fuses 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 fuseholders To do so could cause a shock of fire hazard 1900 Garden of the Gods Road _ Colorado Springs CO 80901 e Service instructions are for trained service personnel To avoid dangerous electric shock do not perform any service unless qualified to do so Do not attempt internal service or adjustment unless anoth
7. Units lets you select Volt Ampere Watt or unknown as the unit of measure for the channel scale offset and vertical measurement values The unit you select is appended to these numeric values You would use Volt for voltage probes Ampere for current probes Watt for optical to electrical 0 E converters and unknown when there is no unit of measure or when the unit of measure is not one of the available choices Ext gain and Ext offset When you select Ampere Watt or unknown two additional softkeys are available external gain and external offset These two additional softkeys allow you to compensate for a transducer s actual characteristics as compared to its ideal characteristics For example you might have an amplified lightwave converter whose ideal characteristics are 300 V W with 0 V of output offset But its actual characteristics are 324 V W with 1 mV of output offset Set the external gain to 324 V W and the external offset to I mV Because the mainframe s CAL signal is a voltage source you can let the oscilloscope compensate for the actual characteristics of your probe by letting the oscilloscope calibrate to the tip of the probe The following steps illustrate how to calibrate a voltage probe to the probe tip 1 Setthe Atten units softkey to ratio 2 Set the Units softkey to Voltage 3 Connect the probe to the front panel CAL signal 4 Press the Calibrate Probe softkey The oscilloscope automatically calibrates to
8. Volt Am pere Watt or unknown as the unit of measure for the channel scale off set and vertical measurement values 33 34 Index t known 29 A accuracy best accuracy calibration 17 de gain 24 de voltage measurement 22 offset 24 specifications i7 altitude for operation 26 analog bandwidth 22 Atten attenuation units softkey 14 B bandwidth characteristics 23 specifications 22 best accuracy calibration 17 Best accuracy calibration memory 20 C cable length compensation i7 Cal calibrated status softkey 18 Calibrate probe softkey 16 Calibrate softkey 17 Calibrate to best accuracy softkey 17 calibration signal3 13 channel characteristics 23 25 display 12 noise 13 scale 12 14 specifications 22 Channel 1 also 2 3 4 Last Calibration 19 Channel setup hardkey 10 Channel setup hardkey menu map 10 characteristics actual 15 channel 23 25 cormpensation 15 environmental 26 external trigger 25 general 26 ideal 15 internal trigger 25 power requirements 26 characteristics continued time base 25 trigger 25 weight 26 Current frame A Temp 19 D date current 18 of last calibration 20 dc accuracy specifications 5 de component removing 13 de gain accuracy 24 de offset range 24 de voltage measurement accuracy 22 difficulties resolution 29 digital offset 13 Display softkey 12 E environmental conditions 26 error messages 30 32 Ext external gain softkey 15 Ext external of
9. display area s time window are plotted to the screen 25 Environmental Conditions Power Requirements Weight Specifications and Characteristics General Characteristics General Characteristics These general characteristics apply to the HP 54721A plug in The instrument meets Hewlett Packard s environmental specifications section 750 for class B 1 products with exceptions as described for temperature and condensation Contact your local HP field engineer for complete details Temperature Operating 10 C to 40 C 50 F to 104 F Nonoperating 40 C to 70 C 40 F to 158 F Humidity Operating up to 95 relative humidity noncondensing at 40 C 104 F Nonoperating up to 90 relative humidity at 65 C 149 F Altitude Operating up to 4 600 meters 15 000 ft Nonoperating up to 15 300 meters 50 000 ft Vibration Operating Random vibration 5 to 500 Hz 10 minutes per axis 0 3 grms Non operating Random vibration 5 to 500 Hz 10 minute per axis 2 41 grms Resonant search 5 to 500 Hz swept sine 1 Octave minute sweep rate 0 75g 5 minute resonant dwell at 4 resonances per axis Supplied by mainframe Net approximately 1 4 kg 8 0 Ib Shipping approximately 2 3 kg 5 0 Ib 26 In Case of Difficulty 27 In Case of Difficulty This chapter gives you a few helpful hints in case you are experiencing difficulty in getting your plug in to operate The simple check ste
10. for complete probe characteristics Number of Channels Number of Mainframe Slots 2 Max Sample Rate to Analog Bandwidth 3 64 1 Digital Bandwidth Limit dc to sample rate 20 in the real time mode only Rise Time 318 ps Channel Scale 8 divisions full screen l 1 mV div to 1 V div Channel Scale with HP 54701A Active Probe 10 mV div to 10 V div Full Resolution Channel Scales 10 20 50 100 200 500 1000 mV div Vertical Resolution Real Time amp bits 0 4 increasing to 8 6 bits 0 1 with digital bandwidth limit turned on Equivalent Time 8 bits 0 4 This can be improved by averaging to gt 12 bits 23 Specifications and Characteristics Characteristics dc Gain Accuracy 3 Normal Accuracy 3 of full screen Best Accuracy Cal 1 of full screen With HP 54701A Active Probe 2 of full sereen Offset Accuracy 3 Normal Accuracy 3 of offset setting 3 of full screen Best Accuracy Cal 0 5 of offset setting 1 of full screen With HP 54701A Active Probe 0 5 of offset setting 2 of full screen de Offset Range 12 times the full resolution channel scale RMS Noise Max Sensitivity lt 300 uV Input Connector N type f Previous HP 54721A plug ins with serial prefix 3210A shipped with a BNC input connector Input Coupling cutoff Frequency dc ac 84kHz Maximum Safe Input Voltage de 5 Vrms 27 dBm ac 50 Vde 5 Vac rms Probe Power Yes 24 Time base Internal Trigger
11. plug in s memory does not match the hardware in the plug in This can be caused by a communication problem between the mainframe and the plug in You want to make sure that there is a good connection between the mainframe and the plug in Remove and reinstall the plug in into the mainframe To make sure that the plug in is seated correctly finger tighten the knurled screw at the bottom of the plug in ol In Case of Difficulty Error messages Error message Plug in is not supported __ System firmware upgrade is needed The system firmware in your mainframe does not support this plug in To upgrade your system firmware contact you nearest Hewlett Packard Sales Office use the software update request form that is in the system firmware or use the copy of this form that is in the User s Reference for the mainframe To print out the firmware update request form follow these steps 1 Connect a printer to the oscilloscope 2 Press the blue shift key on the keypad then press the Setup print key printed in blue above the Print key 3 Pressthe Print format softkey Use the knob arrow keys or softkeys to select the correct printer then press the Enter softkey 4 Press the Destination softkey Then select the correct destination for your printer If the destination is HP IB make sure you select the correct HP IB address that matches your printer If you are unsure what the HP IB address of the printer is refer to the manual that
12. prabe Done See Also Channel Setup Menu Probe Probe The Probe menu allows you to set up the oscilloscope so that the screen displays the channel scale offset and voltage measurements that correspond to the probe When you press the Probe softkey the menu at the left is displayed Atten units Attenuation units lets you pick how you want to represent the prebe attenuation factor Set the attenuation units to decibel for attenuators and to ratio for probes Probe atten Probe attenuation lets you select a probe attenuation that matches the probe or device connected to the oscilloscope When the probe attenuation is set correctly the oscilloscope maintains the current scale factors if possible All marker values and voltage measurements will reflect the actual voltage at the tip of the probe The probe attenuation range is from 0 0001 1 to 1 000 000 1 When you connect an active probe power connector to the plug in the oscilloscope automatically sets the probe attenuation For all other probes set the probe attenuation with the knob arrow keys keypad or use the Calibrate probe softkey Calibrate Probe in this chapter for information on how to calibrate to the tip of the probe when you are using voltage probes 14 Atten units decibel Probe atten 1 600 i Waits LAmpere Ext ain 1 00 U Ext offset Calibrate probe Example Voltage probes Channel Setup Menu Probe Units
13. try to perform a best accuracy calibration when the memory is protected the message Best accuracy calibration memory protected is displayed at the top of the screen You must set the best cal switch on the rear panel of the mainframe to Unprotected before a best accuracy calibration is allowed Plug in This lists the model number serial number date and time of the plug in s last calibration and the temperature A from the mainframe s temperature when the last best accuracy calibration was performed If this temperature A is more than 5 C then you must perform a new best accuracy calibration to make sure that your measurement results are to the 1 percent de accuracy specifications 20 Specifications and Characteristics al Channel Internal Trigger External Trigger Specifications This chapter lists the system specifications and characteristics of the HP 54721A plug in when it is combined with either the HP 54720 or HP 54710 mainframes The specifications and characteristics for the mainframe are in the HP 54720 and HP 54710 Oscilloscope User s Reference Specifications The following are specifications used to test the HP 54721A plug in Specifications are valid after a 20 minute warm up period See the HP 54701A Active Probe service guide for complete probe specifications Analog Bandwidth 3 dB dc to gt 1 1 GHz Bandwidth 3 dB with HP 54701A Active probe dc to gt 1 GHz dc Voltage Measurement
14. was supplied with the printer 5 Press the Utility key Press the Firmware support softkey 7 Pressthe Firmware update request softkey 7 32 Glossary Atten units attenuation units Lets you set the probe attenuation units to either decibel or ratio Calibrate probe Automatically calibrates voltage probes to their tip so the oscilloscope takes into ac count the actual voltage attenuation factor of the probe and any offset in troduced by the probe Calibrate to best accuracy When the plug in is calibrated to best accuracy you obtain the 1 per cent de accuracy specifications Calibration status Displays de tails on the calibration status of the plug in Decibel Used for setting the probe attenuation when you are using an external attenuator instead of a volt age probe Display channel Turns the chan nel display off and on Offset Moves the waveform verti cally on the display Probe Atten probe attenuation Allows you to set the probe attenu ation factor from 0 0001 1 to 1 000 000 1 Ratio Used for setting the probe attenuation on voltage probes where the division factor is listed as a ratio Scale channel scale Scales the input signal with an internal attenu ator Software expansion is used on the scale settings between the at tenuator ranges Skew Lets you compensate for dif ferences in cable or probe lengths You can also use Skew to overlay waveforms Units Lets you select
15. Display Display Display turns the channel display off and on When the channel display is on a waveform is displayed for that channel unless the offset is adjusted so that the waveform is clipped off the display Also the channel number vertical scaling and offset are displayed at the bottom left of the waveform area They stay displayed until the channel is turned off or until an automatic measurement is performed The automatic measurement results share the same area of the display as the channel setups When the channel display is off the waveform display for that channel is turned off Also acquisition on that channel is stopped unless it is needed as an operand for waveform math functions and any pulse parameter measurements are stopped Even though the channel display is off you can still use the plug in as a trigger source or as a function source in the math menu However the oscilloscope will not trigger unless one or more of the other channel displays are turned on or unless a math function is using one of the channels Scale Scale controls the vertical scaling of the signal If the fine mode is off then the knob and arrow keys change the vertical scaling in a 1 2 5 sequence When the fine mode is on shift down arrow the knob and arrow keys change the vertical scaling in 1 mV increments You can always use the keypad to enter values in l mV increments independent of the fine mode selection Software expansion is use
16. External Trigger Specifications and Characteristics Characteristics Maximum Sampling Rate Real Time 4 GSa s Equivalent Time 500 MSa s Record Length per plug in slot 16 to 32 768 points in the A model mainframes and up to 64 536 points in the D model mainframes Max Record Duration at Max Sample Rate A model mainframes 8 192 us D model mainframes 32 768 us RMS Jitter lt 6 ps 0 005 of delay setting Trigger Level Range 1 5 full resolution screen diameters from center screen Input Resistance 50 Q Input Connector N type f Previous HP 54721A plug ins with serial prefix 3210A shipped with a BNC input connector RMS Jitter lt 6 ps 0 005 of delay setting Trigger Level Range V Max Safe Input Voltage 1 5 V Probe Power Yes 1 Adjustable in 1 mV div steps up to 1 V div and 10 mV div steps above 1 V div 2 The probe attenuation factor is automatically set to 10 1 when the probe s power cable is connected to the plug in The plug in input coupling is automatically set to de and 50 Q 3 Characteristics apply to full resolution channel scales Use the next lower full resolution sensitivity for intermediate channel scale settings 4 These characteristics are valid after a Best Accuracy Cal and Probe Cal 5 Multiple 500 MSa s acquisitions are time correlated into a single record with 1 ps resolution yielding an effective sampling rate of 1 terasample second 6 AU data points that fall within the waveform
17. User s Reference Publication number 54721 97001 First edition December 1993 For Safety information Warranties and Regulatory information see the pages behind the index Copyright Hewlett Packard Company 1992 1993 All Rights Reserved HP 54721A Amplifier Plug In Amplifier Plug In for the HP 54720 or HP 54710 Mainframes The HP 54721A Amplifier is one of several plug ins for the HP 54720 or HP 54710 mainframes Use this plug in when you need the highest sample rate for single shot applications Its main features are e 1 GHz single shot capability 4 GSa s sample rate when combined with a mainframe e 32K memory depth when combined with an A model mainframe and 128K memory depth when combined with a D model mainframe 1 1 GHz bandwidth e 1 GHz external trigger and 1 GHz internal trigger e N type f channel and trigger connectors e Two probe power connectors for two active probes 10 mV div maximum sensitivity with software expansion down to 1 mV div What is the purpose of a plug in The purpose of a plug in is analog signal conditioning A plug in scales the input signal sets the bandwidth of the system and allows you to choose input coupling and input impedance The output of the plug in is an analog signal that is applied to the ADCs that are on the acquisition boards inside of the mainframe A plug in also provides a trigger signal sync to the time base trigger board inside of the mainframe ho
18. d to obtain the scale values not in the 1 2 5 sequence and from 1 mV div to 10 mV div 12 Channel Setup Menu Offset Offset Offset moves the waveform vertically It is similar to the position control on analog oscilloscopes A feature of digital offset is that it is always calibrated The offset voltage is the voltage at the center of the display and the range of offset is 12 time the full resolution channel scale You can use the knob arrow keys or keypad to change the offset setting When an HP 54700 series active probe is used with the plug in the offset control adjusts the offset of the hybrid inside the active probe Input You can use the Input softkey to change the input coupling of the plug in Use de 50 Q for connecting to devices use a standard 50 Q transmission line Use ac 50 Q to remove the dc component from signals which allows you to use more sensitive scale settings to view an ac signal that is riding on a dc voltage Output You use the Output softkey to turn on and off the front panel Calibration signal on the plug in The calibration signal is used to interleave the samplers during the best accuracy calibration of the plug in You should set the Output softkey to off when you are not using the calibration signal This reduces the possibility of stray radiation from the calibration signal causing noise or crosstalk on the other channel inputs 13 Prote atten 1 008 1 nits l Volt Calibrate
19. e plug in is the Channel Setup hardkey This hardkey gives you access to the channel menu for the plug in The channel menu is a softkey menu that comes up on the right side of the display when you press the Channel Setup hardkey You will also notice that there are several types of softkeys available A description of how each softkey functions is given in the User s Quick Start Guide that was supplied with the mainframe Figure 1 is the menu map of the channel setup hardkey iChanne dc 500 il ac 5 N gt 34 kz Atten uni tsh decibel See anaE xe BLS roi ime Probe otten paa ie peace p Units peo elt red Ampere i t i ay eee Ext offset best accuracy jaa aaa 4 PETS ae Cai status ryote 54721802 parapet te as seas 10 Channel Setup Menu When you press the Channel Setup hardkey on the plug in the softkey menu shown in figure 2 is displayed This chapter gives you a description of the function of each channel softkey Some of the softkeys bring up additional menus on the display A picture of each additional menu is included along with a description of the menu Channel softkey menu Figure 2 Channel 1 FINE Display Scaie i680 mUediv Offset 1385 0 mu input ac S N 34 kHz Gutout CEB Fete Ee i 100 mu diyv 185 mu Channel number e en Channel scale setting Offset setting powa ut Channel Setup Menu
20. er person capable of rendering first aid and resuscitation is present If you energize this instrument by an auto transformer for voltage reduction make sure the common terminal is connected to the earth terminal of the power source Whenever it is likely that the ground protection is impaired you must make the instrument inoperative and secure it against any unintended operation Do not operate the instrument in the presence of flammable gasses or fumes Operation of any electrical instrument in such an environment constitutes a definite safety hazard e Do not install substitute parts or perform any unauthorized modification to the instrument Capacitors inside the instrument may retain a charge even if the instrument is disconnected from its source of supply Use caution when exposing or handling the CRT Handling or replacing the CRT shall be done only by qualified maintenance personnel Safety Symbols A instruction manual symbol the product is marked with this symbol when it is necessary for you to refer fo the instruction manual in order to protect against damage to the product Hazardous voltage symbol Se Earth terminal symbol Used to indicate a circuit common connected to grounded chassis The Warning sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injur
21. error occurred in plug in __ Try reinstalling plug in The mainframe could not correctly read the contents of the rmemory in the plug in O Remove and reinstall the plug in Each time a plug in is installed the mainframe rereads the plug in s memory 1 To make sure that the plug in is seated correctly finger tighten the knurled screw at the bottom of the plug in m Install the plug in in a different slot in the mainframe 30 Error message Error message Error message In Case of Difficulty Error messages Busy timeout occurred with plug in __ Try reinstalling plug in The mainframe is having trouble communicating with the plug in You want to make sure that there is a good connection between the mainframe and the plug in Remove and reinstall the plug in into the mainframe To make sure that the plug in is seated correctly finger tighten the knurled screw at the bottom of the plug in Install the plug in in a different slot in the mainframe Communication failure exists at slot __ Service is required An illegal hardware state is detected at the mainframe to plug in interface of the specified slot If the slot is empty then there is a mainframe hardware problem Refer to the Service Guide for the mainframe If a plug in is installed in the slot then there is a plug in hardware problem Refer to the Service Guide for the plug in ID error occurred in plug in __ Service is required The information read from the
22. failure 12 menu 5 triggering edge placement 17 troubles with operation 28 Atten attenuation units softkey 14 Cal calibrated status i8 Calibrate 17 Calibrate probe 16 Calibrate to best accuracy iT Display 12 Ext external gain softkey 15 Ext external offset 15 Input 13 menu 3 Offset 13 Output 13 Probe atten attenuation 14 Scale 12 Skew 17 Units 15 specifications channel22 23 external trigger 22 Interleave cal calibration output 23 internal trigger 22 36 U Unit softkey 15 unknown known 29 V vertical moving waveform 13 scaling 12 waveform movement 3 vibration effects 26 w waveform comparing 17 moving horizontally i7 moving vertically 13 weight 26 Copyright Hewlett Packard Company 1993 All Rights Reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws Document Warranty The information contained in this document is subject to change without notice Hewlett Packard makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability or fitness for a particular purpose Hewlett Packard shall not be liable for errors contained herein or for darnages in connection with the furnishing performance or use of this material Hewlett Packard P O Box 2197
23. fset softkey 15 external trigger characteristics 25 specifications 5 22 F features 2 fine mode i2 front panel 3 H hardkey Channel setup 10 Run 29 humidity for operation 26 I input couphng 13 input resistance 22 Input softkey 13 installing the plug in 5 Interleave cal calibration output specifications 23 internal trigger characteristics 25 specifications 5 22 K known known 29 L last calibration status 20 M main features Z messages error 30 32 model number 20 moving the plug in 5 N noise channel i3 reject 22 RMS 24 noisy simals 13 o offset 24 Offset softkey 13 operation difficuities 29 Output softkey 13 P performance maximizing 5 plug in best performance 5 difficulties 29 mainframe identification 29 moving 5 purpose Z screen message 20 Plug in screen message Z0 power difficulties 28 requirements 26 Probe atten attenuation softkey 14 probe calibrating 16 probe menu 14 ulse width 23 purpose of plug in 2 35 R real time 23 25 rear panel 4 records 25 repetitive sample mode See real tirne resolution 2g RF connectors 5 rise time 23 Run hardkey 29 S sample mode See real time sample rate 25 scale 14 23 Scale softkey i2 serial number 20 signal calibration 13 Skew softkey 17 softkey Index T temperature current 19 operation 26 time current 18 of last calibration 20 time base characteristics Z5 trigger characteristics 25
24. n cable or probe lengths H also allows you to place the triggered edge at the center of the display when you are using a power splitter connected between the channel and trigger inputs Another use for Skew is when you are comparing two waveforms that have a timing difference between them If you are more interested in comparing the two waveforms than the actual timing difference between them you can overlay one waveform on top of the other waveform by using Skew The range of Skew is about 100 us Calibrate to best accuracy Calibrate to best accuracy allows you to achieve the 1 percent accuracy specifications A best accuracy calibration is valid for a specific plug in in a specific slot in a specific mainframe It is valid as long the temperature of the mainframe is within t5 C of the temperature of when it was last calibrated the temperature of the mainframe is within 5 C of when the last best accuracy calibration was done and the best accuracy calibration was performed within the last 24 hours The best accuracy calibration factors are stored in the mainframe s memory The calibration factors are retained until another best accuracy calibration is performed in this slot If you perform another best accuracy calibration on that plug in in a different slot or mainframe when you bring the plug in back into the original slot and as long as another best accuracy calibration was not performed in that slot the original best accurac
25. national Standards Organization members About this edition The following list of pages This is the first edition of the gives the date of the current HP 54721A Amplifier edition and of any changed Plug in User s Reference pages to that edition Publication number All pages original edition 54721 97001 Printed in USA Edition dates are as follows First edition December 1993 New editions are complete revisions of the manual Update packages which are issued between editions contain additional and replacernent pages to be merged into the manual by you The dates on the title page change only when a new edition is published A software or firmware code may be printed before the date This code indicates the version level of the software or firmware of this product at the time the manual or update was issued Many product updates de not require manual changes and conversely manual corrections may be done without accompanying product changes Therefore do not expect a one to one correspondence between product updates and manual updates
26. on is valid Channel 1 Last Calibration The oscilloscope displays Best Normal or Uncalibrated depending on what calibration was last performed on the plug in Best indicates that a best accuracy calibration was performed on the plug in and that the best accuracy calibration factors are retained in the mainframe s memory For the best accuracy to remain valid the internal temperature of the mainframe needs to be 5 C of when the last best accuracy calibration was performed and no more than 24 hours has elapsed Normal indicates that the plug in is not calibrated for best accuracy Either the best accuracy calibration factors were cleared from the mainframe s memory or a best accuracy calibration has not yet been performed in this slot But normal does indicate that the normal plug in calibration is still valid for this plug in and all you have to do to gain back the 1 percent de accuracy specifications is to perform a best accuracy calibration Uncalibrated means that the normal plug in calibration is invalid You must calibrate the plug in to normal accuracy before performing a best accuracy calibration To calibrate the plug in see the Service Guide that is supplied with the plug in 19 Channel Setup Menu Calibrate Best accuracy Calibration Memory The oscilloscope displays either Protected or Unprotected Protected means that the mainframe memory is write protected so you cannot perform a best accuracy calibration If you
27. ps in this chapter are intended for you to perform For complete service information refer to the Service Guide that was supplied with the plug in If the mainframe does not power up Make sure that the mainframe is attached to a power source Make sure that the power switch on the mainframe is set to On and that the rear panel line switch is set to On Remove the plug in to see if the mainframe will power up without it If the mainframe still does not power up refer to the Service Guide that was supplied with the mainframe or return the mainframe to your service department 28 in Case of Difficulty If the plug in does not operate correctly If the plug in does not operate correctly Make sure that the plug in is seated in the slot and that the knurled screw at the bottom of the plug in is finger tight Press the Run key to make sure the oscilloscope is ready to acquire data Set the trigger to auto sweep 1 Press the Trigger key 2 Set the Sweep softkey to auto Make sure that the channel Display softkey is set to On 1 Press the Channel key on the plug in 2 Set the Display softkey to On Make sure the channel offset is adjusted so the waveform is not clipped off the display If you are using the plug in as a trigger source only make sure at least one other channel is turned on If all the channels are turned off the mainframe will not trigger Does the mainframe identify the plug in 1 Press the Utility key
28. strument software or firmware will be uninterrupted or error free Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or nadequate maintenance by the Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or maintenance No other warranty is expressed or implied Hewlett Packard specifically disclaims the implied warranties of merchantability or fitness for a particular purpose Exclusive Remedies The remedies provided herein are the buyer s sole and exclusive remedies Hewlett Packard shall not be hable for any direct indirect special incidental or consequential damages whether based on contract tort or any other legal theory Assistance Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales Office Certification Hewlett Packard Company certifies that this product met its published specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology to the extent allowed by the Institute s calibration facility and to the calibration facilities of other Inter
29. the tip of the probe setting the probe attenuation and compensating for any probe offset Example Other devices Channel Setup Menu Probe Because the mainframe s CAL signal is a voltage source you cannot use it to calibrate to the probe tip when units is set to Ampere Watt or unknown Instead you set the external gain and external offset to compensate for the actual characteristics of the probe or device If you do not know the actual characteristics you can refer to the typical specifications that came with the probe or device The following steps show you how to do this 1 Setthe Atten units softkey to ratio 2 Setthe Probe atten softkey to 1 1 3 Set the Units softkey to Ampere Watt or unknown 4 Setthe Ext gain softkey to the actual gain characteristics of the probe or device 5 Setthe Ext offset softkey to the offset that is introduced by the probe or device Calibrate probe Connect a voltage probe from the plug in to the CAL signal on the mainframe then press the Calibrate probe softkey The oscilloscope calibrates to the tip of the probe by setting the probe attenuation to the actual attenuation ratio of the probe The oscilloscope also automatically compensates for any offset that the probe may introduce 16 Calibrate Calibrate ta best accuracy Channel Setup Menu Calibrate Calibrate Skew Skew changes the horizontal position of a waveform on the display Skew lets you compensate for differences i
30. y Do not proceed beyond a Warning sign until the indicated conditions are fully understood and met CAUTION The Caution sign denotes a hazard It calls attention to an operating procedure practice or the like which if not correctly performed or adhered to could result in damage to or destruction of part or all of the preduct Do not proceed beyond a Caution symbol until the indicated conditions are fully understood or met Product Warranty This Hewlett Packard product has a warranty against defects in material and workmanship for a period of one year from date of shipment During the warranty period Hewlett Packard Company will at its option either repair or replace products that prove to be defective For warranty service or repair this product must be returned to a service facility designated by Hewlett Packard For products returned to Hewlett Packard for warranty service the Buyer shail prepay shipping charges to Hewlett Packard and Hewlett Packard shall pay shipping charges to return the product to the Buyer However the Buyer shall pay all shipping charges duties and taxes for products returned to Hewlett Packard from another country Hewlett Packard warrants that its software and firmware designated by Hewlett Packard for use with an instrument will execute its programming instructions when properly installed on that instrument Hewlett Packard does not warrant that the operation of the in
31. y calibration factors are retained 17 Channel Setup Menu Calibrate Cal status Pressing the Cal status softkey brings up the display in figure 3 Figure 3 Calibrate Current Pate 14 AUG 94 14 19 Current Frame ATemp 0 C Channel Channel i Last Calibration i Best Accuracy Calibration MNemaryg Unprotected i Plug in Medel number 54721A Calibrate to Serial number 3207000101 best accuracy Last Calibration 14 AUG 92 14 19 Cai status Best Accuracy ATemp 2 C Done Current Date This is the current date and time You can compare this to the Last Calibration time That way you will know how long it has been since the last best accuracy calibration or normal plug in calibration was performed 18 Channel Setup Menu Calibrate Current Frame ATemp This is the temperature change of the inside of the instrument since the last mainframe calibration was performed A positive number indicates how many degrees warmer the mainframe is now compared to the temperature of the mainframe at the last mainframe calibration A best accuracy calibration is valid as long as the mainframe temperature A is within 5 C of the temperature at which is was calibrated If the temperature A is more than 5 C of the temperature at which is was calibrated you must perform a mainframe calibration before performing a best accuracy calibration to ensure that the best accuracy calibrati
Download Pdf Manuals
Related Search