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Chapter 4

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Performing

R e cordings

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Dire ct and Buffered

This chapter contains information on the direct and buffered recording
modes. The direct recording mode is used to produce real-time recordings

directly onto the plotting medium. The buffered recording mode uses inter

nal buffers to store digitized input data, which can

recalled by the

7090

to produce single or multiple plots.

Step-by-step instructions for performing direct and buffered recordings and

plots are included in this chapter, as well as a description of the pen posi

tion data-display mode, which you can use to label individual data points

plotted from the buffers. In addition, information is provided on connecting

an oscilloscope to the HP

7090

to preview buffer contents prior to plotting.

The Direct Recording Mode

When used in the direct recording mode, the HP

7090

functions as an X-Y or

Y-T analog recorder and may be used to produce real-time plots of low

frequency input signals. Individual plots are drawn onto the currently

specified recording area. The sampling rate used for all direct recordings is
250 samples per second.

Nominal slewing speed in the direct recording mode is 125 cm/s; accelera
tion is approximately

196

m/s2 (2 g's). Sweep time for Y-T (versus-time)

recordings is detennined by the

TOTAL TIME

setting, and times of

second to

24 hours may be used .

The start of direct recordings may be triggered

manually

(recording is

activated by pressing a front-panel pushbutton),

externally

(recording is

activated by an externally-applied signal), or

internally

(recording is acti

vated when selected trigger conditions are met). Post-trigger times may

also be specified.

complete description of trigger modes and post-trigger

time is contained in Chapter 5.)

Performing

Direct Recording (Versus Time)

To perform a versus-time direct recording, follow these steps:

1. Using the

CHANNEL SELECT

controls, select a single channel (1, 2, or

the Y-axis variable. Select

TIME

for the X-axis.

More than one Y-axis channel can be plotted on a single recording area .

However, the channels to be plotted must be selected and recorded

individually .

Select

the X

and

Y-Axis Variables

Perfonning Direct and Buffered Recordings 4-1

Содержание 7090A

Страница 1: ...s by ArtekMedia 2007 I 1 r ii 1 I 1 1 i 1 1 8 Hewlett Packard 7090A Measurement Plotting System Operator s Manual Copyright Hewlett Packard Co 1984 1986 16399 W Bemardo Drive San Diego California 92127 1899 ...

Страница 2: ...pping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to HP from another country HP warrants that its software and lirmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument HP does not warrant that the operation of the instrument or software or ...

Страница 3: ...Recording Mode 2 2 The Buffered Recording Mode 2 2 The Data Display Mode 2 3 Trigger Modes and Conditions 2 3 I abeling Functions 2 3 Major Feature Locations 24 Front Panel Features 2 4 Rear Panel Features 2 5 Instrument Controls Indicators and Connectors 2 5 Right Front Panel 2 5 Left Front Panel 2 7 Right Side Panel 2 9 Rear Panel Switches 2 9 Preparing the HP 7090 for Use 2 9 Choosing the Corre...

Страница 4: ...ct and Buffered Recordings 4 1 The Direct Recording Mode 4 1 Performing a Direct Recording Versus Time 4 1 Performing a Direct Recording Versus Chan3 4 3 The External Pen Connector 4 4 The Buffered Recording Mode 4 4 Minimum Sample Rate _ 4 6 Performing a Buffered Recording Versus Time or Versus Chan3 4 7 Displaying and Labeling Buffered Data Points 4 8 Displaying Buffer Contents on an Oscilloscop...

Страница 5: ...ing Default Character Size Positioning PI and P2 Rotation of I abels AppendixA Default Conditions and Values AppendixB Specifications AppendixC Supplemental Characteristics AppendixD Accessories Available Subject Index 6 1 6 4 6 S 6 7 6 8 A I S l C 1 0 1 51 1 Table of Contents Continued Table of Contents v ...

Страница 6: ...A with specific computers Pocket Guide The Pocket Guide is intended for those who are already familiar with the information contained in the Interfacing and Program ming Manual and who need a convenient reference during remote applica tions of the HP 7090A If you have just received your HP 7090A or are just learning to use it read the f ollowing portions of the Operator s Manual before attempting ...

Страница 7: ...he lEe Publication 348 Safety Requirements for Electronic Measuring Apparatus and has been supplied in a safe condi tion Whenever it is likely that the protection of the instrument has been impaired due to transport or storage stress for example do not attempt to operate the apparatus Initial Inspection and Accessories Inventory The individual parts of your Measurement Plotting System were inspect...

Страница 8: ...ast 2 inches of clearance on all sides to permit ventilation Do not block the fan filter on the rear panel or the vent slots on the sides of a the instrument housing WJ AC Power Requirements Power Options 1 2 Owner s Infonnation WARNING To prevent operator injury or damage to the instrument verify that the line voltage setting and fuse protection are correct before connecting the line power Also e...

Страница 9: ...umber 100 V or 120 V 2 5 AT SB 250 V 2110 0015 220 V od40 V 1 25 AT SB 250 V 2110 0305 U S or 211 0472 Emopean WARNING To avoid the possibility of injury disconnect the ac power cord before installing or replacing a fuse NOTE Fuses and fuse caps appropriate to the instrument shipment des tination are installed at the factory U 8 fuses are X Ill inches and use HP 2110 0565 fuse caps European fuses ...

Страница 10: ... in Canada Japan Mexico Philippines Taiwan Saudi Arabia UL approved in United States NEMA6 15P HP Part Number 8120 0698 250 V 15 A 1 f J 904 plug rating For use in Canada UL approved in United States a SEV 1011 HP Part Number 8120 2104 250 V IO A 1 q 906 plug rating For use in Switzerland DHCK I07 HP Part Number 8120 2956 250 V 10 A 1 q 912 G plug rating For use in Denmark Il SABS l64 HP Part Numb...

Страница 11: ...vailable 2 Clean the outer surface with a damp sponge or lint free cloth Use a mild cleaning solution if necessary followed by water to rinse offany residue Wipe dry after cleaning 3 Clean inside the plastic sleeves of the HIGH LOW and GUAAD input ter minals with a cotton tipped swab and isopropyl alcohol NOTE To prevent scratching do not use abrasive cleaners on the outer surface of the HP 7090 I...

Страница 12: ...ance Shipping the Instrument 1 6 Owner s Information When shipping the HP 7090 be sure it is packed in a protective carton Keep the original packing materials and shipping carton for this purpose If needed packing materials and carton may be ordered through your local Hewlett Packard Sales and Support Office If your plotter is being returned to Hewlett Packard for service contact your nearest HP S...

Страница 13: ...codes which may be displayed on the liquid crystal display error codes appear as lE followed by a code number d Hardcopy graphics produced on the HP 7090 or any other materials that might help illustrate the problem area e The serial number of the instrument Oocated on the rear panel 3 Include your name and address Also include a telephone number where you may be reached during the day 4 Do not in...

Страница 14: ......

Страница 15: ... Three channels are available for receiving analog input signals Each channel usesits own analog to digital AID converter to digitize the analog input and the resulting digital infor mation is routed according to the functions or modes that you select from the front panel The fonowing block diagram shows the major operating modes and functions of the HP 7090 and the selectable routes of digitized ...

Страница 16: ...irect recording digitized data is routed directly to the X Y plot ting mechanism Any of the input channels can be selected for plotting against time versus time measurements In addition measurements can be made for which the Channel or Channel 2 input is selected for plotting against Channel 3 versus chan3 measurements The HP 7090 contains three buffers one for each channel that are used to store ...

Страница 17: ...oordinate values of points of interest on buffered recording plots You can specify how and when direct or buffered recordings will be trig gered by specifying trigger modes and conditions on the front panel Recordings can he triggered manually by pressing a front panel push button or as the result of specified external or internal events Trigger modes and conditions are detailed in Chapter 5 Label...

Страница 18: ... Drive Wheel Grip the paper during plotting The grit covered drive wheel moves the paper hack and forth across the platen 5 Pen Holder Maneuvers the pens during plotting operations 6 Paper LoadingLever Used to raise or lower the pinch wheels during insertion or removal of paper 7 Liquid Crystal Display LeD Displays measurement parameters and other pertinent data 8 Left and Right Front Panels Inclu...

Страница 19: ...explanation of any listing refer to the appropriate section of this manual Some of the pushbuttons described below serve two functions the secondary functions called shiftfunctions and labeled in blue on the front panel are aecessed by first pressing the blue SHIFT pushbutton to display SHIFT on the LCO This manual uses the notation SHIFT before the function title to denote shift functions The rig...

Страница 20: ... SIZE Pushbutton Used to select paper size Toggles between 8 5 X 11 and 11 X 17 inches with rear panel paper format switch set to ANSI or between A4 and A3 with rear panel paper format switch set to ISO Current paper size selection is displayed on the LCD SHIFT LOCAL Used to restore the HP 7090 to local mode following a computer issued RLl remote instruction which locks out the front panel control...

Страница 21: ...using an external guard connection 14 OVERFLOW Indicator one per channel Lights when the channel input signal exceeds the voltage range established by the correspond ing channel RANGE and OFFSET setup conditions 15 Signal Input Jack one set per channel Receives the analog input o t PL V 10 1 1 1 3 signal Inputs are floating guarded and accept a dual banana plug 16 16 Guard Terminal one per channel...

Страница 22: ...LL SCALE Pushbutton and Indicator Used to locate or reposition the full scale point a location on the plotting medium representing full scale input When the pushbutton is pressed the indicator lights and the pen moves to the current full scale location The pen cursor controls can then be used to reposition the full scale point Pressing FULL SCALE a second time extinguishes the indicator and enters...

Страница 23: ... 7090 for Use Setting up your HP 7090 is a simple procedure that consists ofloading pens into the carousel inserting the carousel into its receptacle turning on the power and loading the plotting medium This section describes these procedures To obtain plots ofthe highest quality itis important to use pens and media that are matched to your application The fiber tip pens provided with your HP 7090...

Страница 24: ...90 automati cally selects pens 1 2 and 3 to plot Channels 1 2 and 3 respectively You must manually select any of the pens loaded in the carousel for plotting direct recordings drawing grids and labeling measurements Carousel Pen Number 1 2 3 4 5 6 NOTCH Pen Color and Type Blue P 3 Green P 3 Red P 3 Gold P 3 Black P 3 Brown P 3 PEN COLLAR Example Application Plotting Channel 1 Plott ing Channel 2 P...

Страница 25: ...11 In J AND B SIZE 11 X 17 in PAPER ISO SETTING FOR A4 SIZE 210x 297mm AND AJ SIZE 297 x 420mm PAPER The HP 7090 performs a setofself tests and an initialization cycle when ac power is applied The initialization cycle sets all front panel setup values and modes to their default conditions conditions assumed by the HP 7090 in the absence of alternative selections Apply power to the instrument as fo...

Страница 26: ...the shaft PINCHWHEELPOSITION FOR PINCH WHEELPOSITION FOR A AND B ENGLISH FORMATPAPER A4AND AJ METRIC FORMATPAPER 2 Ensure that the paper loading lever is in the raised position this position raises the pinch wheels allowing insertion ofthe plottingmedia 3 Use the PAPER SIZE pushbutton to selectthe paper size you intend to use Forthe ANSI paper fonnatswitch setting theLCD willdisplay 8 5 X II or 11...

Страница 27: ... a confidence test indicating a high probability that the HP 7090is functioning properly The demonstration plot will run on any size paper However because the I plot is preformatted to run on A or A4 size paper the plot will fill only half 1 a sheet of S or A3 size paper Before performing the demonstration plot I make sure the pens carousel and paper have been loaded properly To start the plot hol...

Страница 28: ...function pushbuttons Shift functions are labeled in blue directly below pushbuttons To access a shift function 1 Display SHIFT on the LCD by using the SHIFT pushbutton The push button toggles between on SHIFT displayed and off SHIFT not displayed 2 Press the desired shift function pushbutton The SHIFT display is extinguished andthe selected function is perfonned NOTE Once activated the SHIFr displ...

Страница 29: ...nitialization procedure restores all power up default conditions to the instrument A complete listing of all defaultconditions is provided in Appendix A ofthis manuaL NOTE Performing a front panel initialization erases the current mea surement data stored in the buffers Ifyou intend to plot the current buffer contents do so before initializing or powering down the HP 7090 The RESTORE SETUP SAVE SE...

Страница 30: ...ditionselectors are used to movethroughthe setup condition choices briefly pressing a selector aq esses individual menu items in sequence and thecurrentlyselecteditemis shown by the appropriate menu indicator Holding a selector down enables you to move through the selec tions quickly Selecting a setup condition displaysitscurrent value on the LCD Although the setup conditions are initialized to th...

Страница 31: ...rousel To select a pen press one of the PEN SELECT pushbuttons The pen holder will move from its present position to the carousel which rotates until the selected pen is accessible by the pen holder The pen holder then retrieves the pen and returns to its previous position The first pen selection made following power up causes the carousel to rotateto a standard orientation so that correct pen sel...

Страница 32: ... 65 seconds the HP 7090 will raise the pen Setting the Real Time Clock The internal real time clock used to time recording functions and annotate time labels is preset at the factory using Pacific Standard Time Because the clock is battery powered it will maintain correct time even when the HP 7090 is turned off However time zone changes may necessitatechang ing the clock settings To set the real ...

Страница 33: ...shes at one second intervals to indicate the clock is running The control wheel has no affect on the hours minutes display 7 Press the selector The LeD will display the current minutes and seconds along with MINUTES SECONDS The control wheel has no affect on the minutes seconds display 8 Press the or selector to exit the clock setting function_ The menu selection will return to RANGE 1 Instrument ...

Страница 34: ......

Страница 35: ...you become familiar with the material presented here you will be ready to perform the direct and buffered recording procedures discussed in Chapter Four The Recording Area The direct and buffered recording modes can be used to produce hardcopy plots ofinput signal data Data is plotted or mapped onto a specified area of the paper a rectangular coordinate system called the recordingarea The followin...

Страница 36: ...fthe X and Y axes is defined by specifying appropriate setup condition values In the example RANGE 1 was set at 6 0 volts to scale the Y axis Channel 1 input to 0 0 6 0 volts TOTAL TIME was set to 50 0 milliseconds to scale the X axis time to 0 0 50 0 milliseconds 4 Scaling and drawing the recording area grid The scaling for the grid divisions is selected using the GRID DIVISION setup conditions a...

Страница 37: ...lected by the HP 7090 In addition if Channel 3 is selected for the X axis variable it is not select able for the Y axis y AXISPUSHBUTTONS AND INDICATORS X AXIS PUSHBUTTON AND INDICATORS For the direct recording mode channel selections must be made before you initiate the recording Because real time plots are drawn during a direct recording only one V axis variable may be plotted during a single re...

Страница 38: ...may be expressed in X Y coordinates as FSx FSy Note that the zero and full sca1e points establish Quadrants I 11 Ill and IV of the recording area j FS FSy I FS FSy II III ZERO Y_AXIS I X AX1S IV FULL SCALE IFS FSy If the recording area shown in the preceding illustration was used for plotting a Channel 1 vs Channel 3 measurement for example the zero point would be the intersection of0 0 volts X ax...

Страница 39: ...ea might be prepared for plott ing a versus chan3 measurement having negative X and Y axis data In the lower figure the zero and full scale points have been moved so that Quadrants 11 Ill and IV intersect the hard clip limits Because the pen cannot move beyond the hard clip limits when plotting measurements data points that would normally be mapped onto the deleted regions ofthe recording area wou...

Страница 40: ...oes not occur Thezero and full scalepointsarelocated attheirdefault positions following power up or front panel initialization For AlA4 size paper thezero pointis located on the lower left corner of the paper and the full scale point is located on the upper right as the following illustration shows The result ing coordinate system is oriented so that the X axis is parallel to the long axis of the ...

Страница 41: ...en above the current full scale point The FULLSCALE indicator lights to show the function is in effect To reposition the zero point when you are preparing a recording area follow the steps shown in the following illustration 1 Press ZERO to inuoke the uro positioning unction ZERO indi cator on 2 Usethepencursor con trols to mOlJe the pen PLOTTERPAPER to the desired zero point 3 Press ZERO a second...

Страница 42: ...ot positioned in this manner subsequent plots will be improperly oriented Scaling the Recording Area Boundaries Preparing the Recording Area Step 3 The Total Time Setup Condition Before performing a direct or buffered recording the duration of the recording is specified using the TOTALTIME setup condition In addition the channel input range s of the HP 7090 is established using the channel RANGE a...

Страница 43: ...condition The effects of RANGE on the recording area should be thoroughly understood however before attempting to use offset conditions Setting range on the HP 7090 is effectively like setting the attenuator on a voltmeter accuracy is obtained by choosing a range setting thatis suited to the input signal amplitude Ifno offset is used range should be set equal to or somewhathigherthan theabsoluteva...

Страница 44: ...6 0 VOLTS Setting the RANGE automatically scales the recording area in a manner similar to setting TOTAL TIME For versus time measurements the range setting for the selected Y axis channel designates the range ofthe positive V axis In addition the positive Y axis range is mirrored onto the nega tive V axis This is illustrated by the following diagram which shows the recording area resulting from t...

Страница 45: ...ects the recording area The V max and V m in values for the illustrated signal yield a range setting of5 0 volts Using this setting scales the recording area as shown Because the range setting is mirrored above and below the zero point the entire signal is mapped onto the recording area as shown If a signal having a nonzero median voltage is recorded using a range setting and no OFFSET calculated ...

Страница 46: ... v O seTUPCONDITIONS TOTALTIME 1 0 SECONO RANGE 1 3 25 VOLTS 3 12 Measurement Setup Operations 5 0V Vmax SET RANGE IVm8x Vmlnl 15 5H VOLTS 5 0 VOLTS O CV f 5 0V Vmm o J 0 0 w ZERO Z Z x o 0 0 0 TIME SECONDS FULLSCALE 1 0 5 3V I O CV I SET RANGE IVm8x Vmjnl 15 3 1 2 IVOLTS 3 25 VOLTS 1 2V Vm l n 3 25 o J 0 0 ZERO Z 1i 2 0 TIME SECONDS FULLSCALE I l lC l ...

Страница 47: ...T 10VI _ _ _ _ _ _ _ _ _ _ _ l 1 POSITIVE OFFSET 20V SHIFTS THE SIGNAL UPONTO THE RECORDING AREA wv _ _ __ __ __ _ JOV An offset value should be used that will allow the entire signal to be plotted within the recording area boundaries detennined by the range equation This value is given by the offset equaticn below Because the mean signal voltage is shifted onto the zero voltage axis y axis of the...

Страница 48: ...fset values are whole numbers Rounding V mn and V min results in a recording area with convenient boundary values and provides some headroomforthe recorded signal This is shown by the following illustration for a recording area prepared for plotting signal A using rounded values for V mu and V min Note that the preceding equations for detennining the offset Y axis and boundary values are still val...

Страница 49: ...striction along with the lOO volt limits of selectable offset values results in the following limita tions for valid offset values lOO volts OFFSET and 2X RANGE Themaximum voltage that can be applied as channel input is 200 volts dc or peak using RANGE 100 volts OFFSET lOO volts In addition if the RANGE and OFFSETequations are used for a signal having a median voltage Vmod greater than the signal ...

Страница 50: ... OFFSET USED BECAUSE Vmed H Scaling and Drawing the Recording Area Grid Preparing the Recording Area Step 4 The final procedure in preparing a recording area involves scaling and drawing the grid which provides the customized graph paper onto which the measurementis plotted The following steps which are detailed in this section are used to scale and draw a recording area grid 1 The GRID DIVISIONS ...

Страница 51: ...ished using the setup condition controls however the quadrant grid can be drawn on any or all Quadrants using the quadrant select function r r Y AXIS GRID DIVISIONS r ____ _ _ _ Il I I X AXIS II GRID DIVISIONS 4 1 III I L ____ ___ _______ J You will usually want to select GRID DIVISION values that correlate to your selected TOTAL TIME and or RANGE values This is demonstrated by the following examp...

Страница 52: ... plotted data is to be analyzed a grid should be provided Grids may be drawn before or after data has been plotted To select quadrants and draw the grid perform the following steps L Use the PEN SELECT pushbuttons to select a pen for drawing the grid To emphasize plotted data use a light colored pen for the grid If your carousel is loaded as suggested in Chapter 2 select pen 4 gold 2 Access the GR...

Страница 53: ...ct a pen after invoking the quadrant select function exit the function by pressing one of the setup conditions menu selectors The selected quadrant values are retained by the HP 7090 and the PEN SELECT pushbuttons may be used to select a pen before pressing DRAW GRID A grid cannot be drawn outside the hard clip limits if any of the selected quadrants intersect the hard clip limits the grid will be...

Страница 54: ...the X axis is plotted along the short length of the paper This function may be desirable for applications that require rotated orientation of plotted measurements preparing graphs for verti cal display in a three ring binder for example The illustration below shows recordings that were made using the rotate function on AlA4 size paper l t j I y To invoke the rotate function press SHIFT while holdi...

Страница 55: ...ing areas grids and plots are oriented accordingly Therotate function maybe exited by 1 perfonning a front panelinitialization 2 tuming offthe power 3 restoring a non rotated saved setup or 4 repeating the procedure used to invoke the rotate function press SHIFT while holding down the FAST pushbutton The RototedLocations of Default Z4 ro ond FullScale A A4 Paper RotatedLocations of DefaultZero and...

Страница 56: ... voltage source Voltage overflow conditions are indicated by an overflow indicator An input jack guard terminal jack guard switch and overflow indicator are grouped for each channel as shown below GUARD TERMINAL JACK SINGLE BANANAl INPUTJACK DUAL BANANAl Each channel input jack is float ing to reject common mode voltages a potential source oferror during sensitive measurements When the guard switc...

Страница 57: ...al of the plug into the HIGH port of the jack The HP 7090 will accept peak or dc input voltages of up to 200 volts A schematic of the input terminal circuitry is provided In Appendix B ifyou wish to determine impedance loading values WARNING _ Insert the mains power cord before connecting channel input signals CAUTION Applying input voltages in excess of200 volts dearpeak could damage the HP 7090 ...

Страница 58: ...bedigitized and displayed on the LCD by access ing the data display mode This mode includes two different data display functions labeled INPUT and PEN POSITION on the right front panel The input data display function is used to display input voltages allowing the HP 7090 to serve as a digital voltmeter This function is often helpful in determining the voltage range of input signals To obtain a vol...

Страница 59: ...cted for display Refer to Appendix B for a complete listing of accuracy as a function ofrange settings To exitthe data display mode press the data displayselectorto extinguish the INPUTindicator Ifthe PEN POSITION indicator turns on which will occur unless the buffers are empty press the data display selector again so that neither data display indicator is lit Exiting the data display mode returns...

Страница 60: ......

Страница 61: ...l plots are drawn onto the currently specified recording area The sampling rate used for all direct recordings is 250 samples per second Nominal slewing speed in the direct recording mode is 125 cm s accelera tion is approximately 196 m s2 2 g s Sweep time for Y T versus time recordings is detennined by the TOTALTIME setting and times of 1 second to 24 hours may be used The start of direct recordi...

Страница 62: ...initialization The external or internal trigger modes may also be selected for direct recordings as well as post trigger time delays These trigger modes and operations are described in Chapter 5 5 Press RECORD DIRECT to initiate the trigger search The pen will move to the recording area s zero point The pen remains in the up position until the selected trigger is received at which time the pen low...

Страница 63: ...ed to select the recording duration If a total time of less than 1 second is selected the HP 7090 will reset TOTAL TIME to 1 second and perform a I second recording when the trigger is received 3 Select an appropriate pen color using the PEN SELECT pushbuttons 4 Use the TRIGGER mode selectorto select the desired trigger mode For manual front panel triggering select the MANUAL mode The exter nal or...

Страница 64: ...en The Buffered Recording Mode A Channel Buffer Each ofthethree inputchannels ofthe HP 7090 has its own A D converter and buffer A channel buffer consists of a stack in RAM memory of 1000 memory locations each locationisusedto storea digitized voltage value During abuffered recording thechannelinputvoltages are simultaneously sampled digitized and stored in their buffer at a unifonn rate detennine...

Страница 65: ... an individual recording is retained until another buffered recording is made the power is turned off or the HP 7090 is initialized Data retained in the buffers may be recalled again and again tocreatemultipleplots In addition thedimensions ofrecordingareas used for plotting can be altered for different plots by repositioning the zero and full scale points plotted data is rescaled accordingly Buff...

Страница 66: ...es improve reconstruction 1 CYCLE 1 5 SAMPLES CYCLE J SAMPLES CYCLE 1 1 CYCLE I 1 CYCLE I 4SAMPLES CYCLE 10 SAMPLES CYCLE During a buffered recording each buffer obtains 1000 input signal samples with the TOTALTIME Theresulting sample rate Rmay therefore be expressed as R lOoo TOTAL TIME To assuredata plotted from the buffers will accurately portray therecorded signals a minimum of lO samples per ...

Страница 67: ...rigger modes and operations are detailed in Chapter 5 3 Press FILL BUFFER to initiate the trigger search 4 For the manual trigger mode there is no trigger search and the buffers begin filling when FILL BUFFER is pressed unless a post trigger time delay has been specified Fortheexternal trigger mode thebuffers begin ftlling when the external triggersignal is received For the internal trigger mode t...

Страница 68: ...d to locate and label points ofinterest on buffl r plots Access ing the pen position function allows you to display the contents ofa selected buffer on the LeO after a buffered recording has been performed The HP 7090 can also mark and label the coordinates of selected data points To display and label buffered data points perform the following steps 1 Select the channel whose buffer contents are t...

Страница 69: ...layed voltage are immediately apparent The voltage values of individual points of interest along the plot can easily be determined CURSOR CONTAOLS l J G f v DISPLAYED V AXIS VOLTAGE f t t v f v 11111111111111111111111111111111111111111rcU El DATAPOINT DATAPOINT 1000 While the pen position function is active theX and Y coordinate values ofany selected point on a plot can be labeled by selecting an ...

Страница 70: ... L 3V V _ 09V_ 0 0 4 0 CHANNEL3 VOLTS VERSUS_ CHAN 3 PLOT Y AXIS X AXIS VOLTAGE TIME 2SV D 44S I 0 0 2 0 TIME SECONDS VERSUS TIME PLOT Two SCOPEOUTconnectors located on the right side panel are provided for connecting the HP 7090 to an oscilloscope enabling you to view buffer contents on the scope This feature is used to preview stored wavefonns before plotting them on paper or for observing the p...

Страница 71: ...r zero input Set the input coupling for both scope channels to dc Set the scope s display switch to permit viewing of Channel A versus Channel B When the buffers are filled or whilethey are filling data for theselected x and Y axis channels are shown on the oscilloscope display Y axis buffer selections may be selected for viewing individually or simultaneously and time or Channel 3 may be selected...

Страница 72: ...time On Channel B A hardcopy plot has also bee I clfflWII u sill H the same buf f ered data Output from the buffers is available for viewing on the scope only when the HP 7090 is idle U you invoke any function on the HP 7090 the scope display will temporarily vanish until the selected function has been completed 4 12 Performing Direct and Buffered Recordings I r r ...

Страница 73: ... elapse afterreceipt ofa valid trigger before recording begins Post trigger times may be specified for either the buffered or the directrecording modes post trigger time may not beused however fortheinside window option ofthe internal trigger mode PRETRrGGER selections on the other hand apply only to bufferedrecordings and are used to specify a time during which data is recorded immediately before...

Страница 74: ... delay states MEASUREMENT TRIGGER RECORDING RECORDING ENDS INITIATED DCCURS BEGINS MEASUREMENT r l _ _ _ _ _ 1_ _ _ _ i l_ _ _ _ OMPL I ETE TRIGGER SEARCH TIME POST TRIGGERTIME RECORDING TIME nRIGGER SEARCH LEDON TRtGGER SEARCH nRIGGEASEARCH LED BUNKING LEDOFF v J m The Manual Trigger Mode The TriggerMode Seleclor and Indicators The manual tr igger mode provides manual front panel local triggering...

Страница 75: ...be triggered by contact closure of the positive terminal of the connector to the connector s ground terminal The Internal Trigger Mode With the internal trigger mode you can specify signal voltage and slope requirements that must be met by the Channel input to trigger a record ing After specifying the requirements and initiating a trigger search the HP 7090 continuously monitors the Channel input ...

Страница 76: ...trigger level value Refer to the following diagram TRIGGER LEVEL VOLTAGE VALUE TRIGGER LEVEL VOLTAGE VALue TRIGGER OCCURS I It POSITIVE SLOPE I TRIGGER I OCCURS 11 POSITive SLOPE The below level trigger option is similar to the above level option but it permits negative slope triggering at the TRIGGER LEVEL voltage setting The trigger is generated when the Channel 1 input signal falls to or below ...

Страница 77: ...pecified voltage limits ofthe current recording area If you initiate a trigger search while the indicator is blinking the HP 7090 will internally set the trigger width value to the corresponding upper or lower voltage limit ofthe recording area The intemally set level will not be displayed however The outside and inside window option enables you to define a trigger window having an upper and lower...

Страница 78: ...RIGGER NG r i TRIGGER WIDTH r ER 1 j V r TRIGGER WIDTH I 1 ER Pt r I V TRIGGERING OCCURS The Trigger W idth Setup Condition Default Value 0 0 volts Range ofSelectable Values 0 0 to 200 volts The TRIGGER WIDTH setup condition is used to define the trigger window widthforthe inside and outside window trigger options TheTRIGGER WIDTH indicatorwillblink ifyouspecifya TRIGGER WIDTH value thatisgreatert...

Страница 79: ...may be specified however pre trigger time selections are ignored T TRIGGER W DTH TRIGGER LEVEL l _ TRIGGERING __ __ OCCURS For the buffered record ing mode the recording is completed and triggering occurs when 1000 consecutive data samples have occurred inside or upon the window limits This is shown by the following illustration The buffers start to fiIJ when a signal sample falls inside or upon t...

Страница 80: ...If you select a pre trigger time the required number ofconsecutive inside window samples is reduced accordingly as illustrated below Pre trigger data consists of samples that immediately precede the buffered sequence of inside window samples Note that the buffers are filled when the Channel input signal has remainedinside the window for a time equal to TOTAL TIME PRE TRIGGER time I 1000SAMPLES I 1...

Страница 81: ...with the inside window option are subject to post trigger time selections Post trigger time is the amount of time delay that must elapse after triggering before recording occurs Pre trigger time on the other hand applies only to internally or externally triggered buffered recordings A prc tigger time value specifies what por tion of TOTAL TIME is to be used for storing digitized input signal data ...

Страница 82: ...time Exceeding the total time causes the POST TRIGGER PRE TRIGGER indi cator to blink and the HP 7090 will internally set the pre trigger value to your specified TOTAL TIME value The reset value is not displayed on the LCD however 5 10 Trigger Modes and Operations I i i I i j I I Ii Ii Ii Ii Ii e i i ...

Страница 83: ...ns this chapter assumes that no such I O instructions have been issued Any available color and width pen may be used for labels a O 3 mm black pen is suggested and labeling always begins at the current pen position Use the pen cursor controls to position the selected pen before invoking a label function The pen should be positioned so that the entire label can be printed withinthe hard clip limits...

Страница 84: ...ulting label will fitwithinthehard clip limits ofthe paper Thearea required forthetrigger time label is the same as that for the time and date label refer to the preceding section To print the trigger time press SHIFT PRINT TRIG TIME Be certain that SHIFI is displayed on the LCDbeforepressing the PRINT TRIG TIME push button The HP 7090 will print the time at which the most recent trigger was recei...

Страница 85: ...bel is updated any time you use the control wheel to select a new setup condition A typical setup conditions label is shown below Trigger level and width values are labeled only when the internal triggering mode is selected The below level triggering option is denoted as LEVEL whereas the above level option is denoted as LEVEL tCHAN NEL l rCHANNE L 2 RANGES 5 000V tl 0 00V OFFSETS 2 0V O OV TOTAL ...

Страница 86: ...ollowing illus tration the completeset oflabels was createdby initially positioning the pen and then invoking each label function TOT PR r r 3 70 0 T 14 0 0 TRtGo 0 015 TI lE 10 3 10 0 V 0 00 ps I E jI I 1 v M V I Label Character Size The dimensions used for label characters are based upon the relative posi tions of two movable points Pi and P2 Following power up or front panel initialization PI a...

Страница 87: ...DEFAULTP2 I I I I I I I I I I DEFAULTP L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ J Default Locations of PI andP2 AIA4 Paper Default l ocalioll8 of PI andP2 lJ A3 Paper The width of the characters used for labels is 0 75 of the horizontal dis tance between PI and P2 Similarly the heighloflabel characters is 1 5 of Labeling Functions and Operations 6 5 ...

Страница 88: ...rea Changing Default Character Size The default characters are compatible in size with the dimensions of the default recording area For applications requiring smallerrecording areas however you may want to reduce the character size accordingly Because the default proportions height to width ratio of the label charac ters are preset to provide visually appealing characters the simplest method of re...

Страница 89: ...LE P2 indicatorremainslitwhilethe P2 positioning function is in effect indicating thatthe pen cursorcontrols can beusedto position P2 To reduce character size for example use the pen cursor controls to move P2 towards PI along the diagonal PI P2 The final location ofP2 does not have to lie exactly upon PI P2 an approximate location will do After positioning P2 exit the function by pressing the P2 ...

Страница 90: ... to position both PI and P2 always move PI first If moving Pl pushes P2 against any of the hard clip limits either or both coordinates of P2 are set to those of the hard clip limits Using the rotate function described under Rotating the Recording Area in Chapter 3 to rotate recording areas also rotates the orientation of printed labels Thisis done so that all labels are printed upright in relation...

Страница 91: ... is changed so that the height of rotated characters is slightly elongated as shown below If you want to shorten the characters use the P2 positioning function to reduce the vertical distance between PI and P2 TRIG TIME 12 04 46 ACTUAL SIZE IA M PAPER TRIG TIME 12 04 46 ACTUAL size IB AJ PAPER RotatedLocations of Default PI and P2 B A3 Paper RotatedDefault CharacterSize Labeling Functions and Oper...

Страница 92: ...p conditions Range Channels 1 2 and 3 Offset Channels 1 2 and 3 Grid divisions X axis Grid divisions Y axis Total time Post or pre trigger time Trigger level Trigger width Front panel selections Trigger mode selection Channel selections Setup conditions selection Quadrant selection for grid Value 10 0 volts 0 0 volts 25 AlA4 size paper 38 B A3 size paper 18 A A4 size paper 25 B A3 size paper 1 0 s...

Страница 93: ...tion ratio 140 dB de 100 dB ac 60 Hz with 1 kn unbalance in LOW terminal on most sensitive range at 250 C 50 RH I HfGH r 7 1c t 1 I I I I 200V PEAK lMO 45pf LOW r 7 1 r 1 40V PEAK GUARD 250V PEAK I 100 kfl I I 0561011 I I I L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ J 2oop T APPROXIMATE L r STRAY Timebase Range Buffer mode Directrecord mode Accuracy 30 milliseconds to 24 hOUTS 1 second to 24 hours 0 1 Specif...

Страница 94: ...el selectable over the full scale range in 1 0 increments NOMINAL Source channel 1 External trigger BNC connector TTL level or contact closure to ground Manual trigger Available from front panel controls or 1 0 Display Up to 1 9b pre trigger up to 24 hour post trigger delay after trigger before measurement start Electrical Accuracy Tables Constant Percent Reading Range Inaccuracy Inaccuracy 5 m V ...

Страница 95: ...024 V SO V O OO6O V 0 100 V O Ol20 V C Constant Range Inaccuracy 5 mV 6 lOmV 5 G 20 mV 4 50 mV and up 3 Constant Range Inaccuracy 5 mV O BB lOmV O 56 20 mV O 40 50 mV and up O 30 Percent Reading Inaccuracy Per Degree C O OI Percent Reading Inaccuracy O OSS Percent Reading Inaccuracy O OI ElectricalAccuracy TemperatureCoefficient from25Degrees C ElectricalAccuracy 25Degrees C AID ConverterQ unts El...

Страница 96: ...sparency film Papersizes switch selectable 210 X 297 mm ISO A4 297 X 420 mm ISO A3 Programming 8 5 X 11 in ANSI A 11 X 17 in ANSI B HP IS control of all recorder and plotter functions Software lockable front panel Scope Output Allows use ofX Y oscilloscope to preview buffer contents Connectors two BNC vertical and horizontal Output 10 V to 10 V 0 V corresponds to origin on chart refreshed every 15...

Страница 97: ...ity 5 95 at 40 C 0_550 C 40_750 C Operating temperature Storage temperature Power Requirements Source 100 120 220 240 V 10 50 0 Frequency 4S 66 Hz Consumption 140 W Size Height 205 5 mm S l in Width 575 0 mm 22 6 in Depth 465 mm lS 3 in Weight Net 15 7 kg 34 5 Ibs approximately 23 6 kg 52Ibs Shipping C 2 Supplemental Characteristics p p 2 p 2 S ii ...

Страница 98: ...al 07090 90000 Dust cover 92259D HP 17090A B or C measurement graphics software Option 630 3 5 in disc Option 655 5 25 in disc The following table lists the operating system memory and equipment that are needed to use the HP 17090 software with the HP 7090 HP 17090 Operating Available RAMI Applicable Version System Minimum Optimum HP 9000 Modeb A BASIC 2_0 235K 470K I IP 216 HP 226 HP 236 HP 220 B...

Страница 99: ...uired by the user s system 4Substitute CRTA forCRTB when the HP 98546A display compatibility interface is used Mpplicable when equipped with BASIC 4 03and an HP 982l3C keyboard sBASIC 4 03 i s required when the computeris equipped with an HP98203C keyboard 7 T he HP46083A knob is required when thecomputeris equippedwith eitheran HP46020A or 4602IA keyboard sThe HP 98546A dis play compatibility int...

Страница 100: ...ter User s Catalog 5953 2450 from your local HP Sales and Support Office or by writing Hewlett Packard San Diego Division 16399 West Bemardo Drive San Diego CA 92127 1899 In a hurry Your fastest way to receive products is to call HP s Direct Order telephone number 800 538 8787 or 408 738 4133 in California Alaska Hawaii Assessories Available D 3 ...

Страница 101: ...7 through 4 8 c Carousel Pen Cleaning 1 5 Loading 2 10 Channel Buffer See Buffer Channel Input Signals See Analog Input Signals Channel Select Controls Using the 3 3 Channel Selection 3 2 through 3 3 Character Size 6 4 through 6 6 Cleaning the Instrument 1 5 through 1 6 Clipping 3 4 through 3 5 Clock Setting the Real Time 2 18 through 2 19 Confidence Test 2 13 through 2 14 Control Wheel Using the ...

Страница 102: ... 5 3 External Trigger Mode 5 3 f Fill Buffer Button 4 7 Full Scale Button 3 7 Full Scale Point Default 3 6 Positioning the 3 7 Rotated 3 20 through 3 21 Fuse Replacing the 1 3 9 Grid Button 3 19 Grid Divisions Setup Condition 3 17 through 3 18 Grid Drawing the 3 18 through 3 19 Ground Connection Lug 3 23 Grounding Requirements 1 5 Guard Connecting and External 3 22 through 3 33 Guard Switch Using ...

Страница 103: ...5 5 through 5 6 Overhead Transparencies See Transparency Film Overflow Condition Causes of 3 24 Overflow Indicator 3 24 p PI Button 6 7 through 6 8 P2 Button 6 8 Paper Format Switch Setting the 2 11 Paper Size Button 2 12 Paper Sizes 2 11 Loading 2 12 through 2 13 Pen Cursor Controls 2 18 Pen Down Button 2 18 Pcn Select Buttons 2 17 Pen Up Button 2 18 Pens Choosing the Con ect Type 2 9 Loading 2 1...

Страница 104: ... 11 Range Setup Condition 3 9 through 3 11 Real Time Clock Setting the 2 18 through 2 19 Record Direct Button 4 2 4 3 Recording Area Defined 3 1 Preparing a 3 1 through 3 22 Rotating the 3 20 through 3 22 Scaling the 3 8 through 3 16 Restore Setup Button 2 15 through 2 16 Rotating Labels 6 8 through 6 9 Rotating the Recording Area 3 20 through 3 22 s Sample Rate Effect ofTotal Time on 4 6 Minimum ...

Страница 105: ...or 5 2 Trigger Modes Defined 5 1 Trigger Search Indicator 5 2 Status 5 1 through 5 2 Trigger Width Setup Condition 5 6 Trigger Width Defined 5 5 Trigger Window Defined 5 5 through 5 6 v Ventilation Requirements 1 2 Versus Chan3 Measurement Defined _ _ 3 2 through 3 3 Performing a Direct 4 3 through 4 4 Performing a Buffered 4 7 through 4 8 Versus Time Measurement Defined _ 3 2 through 3 3 Performi...

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