Time Measurements | Fluke PM3370B manual

FUNCTION REFERENCE

5 - 75

TIME MEASUREMENTS

Description:

Time measurements can be made using the cursors or using automated, calculated measurement routines. Cursors operate in the analog mode as well as in the digital mode.

Calculated time measurements are available in the digital mode only. Using the cursors, three time interval readouts can be selected:

-ΔT gives the time interval (seconds) between the cursors.

-1ΔT gives an inverted readout of the time interval, and is read in Hz.

-ΔT-ratio gives a percentage (%) that can be reset by using the ΔT=100% softkey. For more details, refer to CURSORS READOUT.

In the digital mode, the MEASURE menu accesses automatic time measurements. This menu is reached via the key sequence ‘MEASURE >> MEAS 1(2) >> time’. The TRACK control us used to select the type of measurement and the Δ control is used to select the waveform.

The result of the measurement is displayed in the top left corner of the screen.

	PERIOD
	PULSE
	DISTAL
	MESIAL
1−	PROXIMAL
1−
RISE	ST6744
RISE	FALL

The following measurements are possible:

(Refer to section MEASURE MENU for details of signal parameters).

-freq (FREQUENCY).

Measures the reciprocal of the PERIOD of the signal. Frequency is calculated between the first and third mesial of the signal. At least one complete signal period must be acquired to get a valid measurement.

freq =

1

time of 3rd mesial - time 1st mesial

Image 195

Fluke PM3370B user manual Time Measurements

Contents

Qvwuxphqw Fluke Industrial B.V III Reference ManualReference Manual also contains Main Features Page Or model number Following parts should be included in the shipment VII Contents More Advanced Trigger Functions HOW to USE More Advanced FunctionsScreen Controls Auto Setup Getting Started -1 3.1 FRONT-PANEL Layout Contents Contents XII CH3 XiiiCH1 CH2 XIV MODLine Ieee 488.2 BUS Option CH1 Y-OUTMain TB Gate DTB Gate Safety Precautions Operators SafetyIntroduction Symbols Impaired Safety ProtectionMeasuring Earth Mains voltage cord, mains voltage range and fuses Safety InstructionsInstallation Instructions Protective earthing Rear View General information Installation of batteriesMemory BACK-UP Batteries Front Cover Ieee 488.2/IEC 625 BUS Interface Option Handle Adjustment and Operating Positions of the Instrument RS-232-C Serial Interface Rack MountingVersions Getting Started FRONT-PANEL Layout Switching on the Instrument Screen control area Screen Controls Connect the probe as shown in figure Auto Setup ST5952 Mode Switching Between Analog and Digital Operating Modes Signal Criteria Analog Mode Digital ModeOther Criteria Sions Getting Started Signal Criteria Analog Mode Digital ModeSignal with an ampli Tude of 2 to 6.4 divi Reconnect the probe to the Probe Adjust signal for display Vertical Setup AC Input Coupling Getting Started Timebase setup Timebase Setup Magnify Expand Direct trigger setup Direct Trigger Setup Summary PRE-TRIGGER View Menu keys and softkeys More Advanced Features Cursor Operation Vertical cursors ’’ or the horizontal cursors ’=’ More Advanced Trigger Functions 10 More advanced trigger setup More Signal Detail with the Delayed Timebase Standard SetupPress the Status key and Text OFF key at the same time for MTB1.00ms Ch1 Select Clear & Protect Select Clear ALL Trace Storage Press the Recall key Here is how traces are stored in memory PM3394B 200 MHz Full Four Channel Oscilloscope HOW to USE the Instrument PM3370B 60 MHz 2 Channel Oscilloscope PM3390B 200 MHz 2 Channel OscilloscopePM3384B 100 MHz Full Four-Channel Oscilloscope PM3380B 100 MHz 2 Channel Oscilloscope Front Panel Layout HOW to USE the Instrument Simultaneously press the Status and Text OFF keys Display and Probe AdjustmentsRecall Standard Setting Display Adjustment Display Layout Menus Text OFF Off TPress the Text OFF key three times Repeat this adjustment for the second probe CAL Signal and Probe Adjustment Analog and Digital Modes Autorange attenuator Not available Results in a An amplitude of 2 toDivisions Press the Analog key again Standard SettingAnalog to Digital Mode Switching Press the Autoset key for optimum signal display 12HOW to USE the Instrument Trace Storage RUN/STOPPress the RUN/STOP key Vertical Deflection Press the AC DC GND key to obtain ground coupling 14HOW to USE the InstrumentVertical Coupling AC, DC, GND Press the AC DC GND key once for DC input coupling Press the AC DC GND key again to obtain ac input coupling Vertical Position Press the upper key of the Ampl keys 16HOW to USE the InstrumentAdjust Ampl to 100 mV Vertical Amplitude Press the upper Ampl key once Verticalauto RangeVertical Variable Amplitude Press the Auto Range key Vertical CH1+CH2 18HOW to USE the InstrumentPress the Analog key to switch to the Digital mode Press the Analog key to return to the analog mode Vertical Invert Press the ’BW LIMIT’ softkey to turn it off again 20HOW to USE the InstrumentVertical Menu Bandwidth Limiter Press the ’BW LIMIT’ softkey to turn it on Connect the probe again Vertical Probe Range IndicatorRemove the input signal from CH1 Vertical Menu Set the timebase to 200 μs Signal is displayed with four periods on the screenHorizontal Deflection and Triggering Timebase TIME/DIV Press one of the TIME/DIV keys Timebaseauto RangeTimebase Main TB VAR Display of 2 to 6 waveform periods Press the right Magnify key 24HOW to USE the InstrumentTimebase Magnify Visible by turning the X POS control Timebasex POS TriggeringTurn the X POS control clockwise 26HOW to USE the Instrument Trigger SourceTriggerslope Turn the Trigger Level control Trigger Trigger Level Turn the Trigger Position control counterclockwise Press the Analog key to select the digital modeSet the delay to 0 with Trigger Position Trigger Trigger Position Trigger Single Shot Digital Acquisition and Storage Advanced Vertical Functions Acquire Average 32HOW to USE the Instrument Acquire Peak Detection Acquire Envelope Press the Trigger key Trigger ModePress the first softkey to select ’tv’ trigger mode Advanced Horizontal and Trigger Functions Press the ’level-pp’ softkey to turn it off Move the indicator T- in and out of the signal range Trigger Mode Triggered36HOW to USE the Instrument Press the TB Mode key Press the ’STOP on TRIGGER’ softkey to select ’yes’ Trigger Mode Roll 38HOW to USE the Instrument Slowly vary the frequency of the sine-wave input signalTrigger Line Press the ’yes’ confirm softkey again Memory FunctionsTrace Storageclear & Protect Press the ’yes’ confirm softkey Select memory location ’m1’ Press the ’save’ softkey 40HOW to USE the InstrumentTrace Storage Save Trace Storage Clear Trace Storage Copy Trace can be copied from one memory location to anotherPress the ’COPY’ softkey Live trace shifts 42HOW to USE the InstrumentTrace Storage Recall Turn the POSition control Press the Recall menu key Trace Storage Saving Multiple TracesTrace Storage Recalling Multiple Traces Press the softkey next to ’yes’ 44HOW to USE the Instrument Cursors FunctionsTime measurements. These can be done in digital Cursors Time Cursors ON/OFF 46HOW to USE the Instrument Cursors VoltCursors Amplitude & Time Cursors Readout Press the softkey next to ’READOUT’ΔV, V1, V2, ΔV-ratio for voltage measurements Cursors Readout ΔT-RATIO/PHASE 48HOW to USE the InstrumentAdjust the cursors to a distance of half a signal period Measurement Functions Start with the standard setting.This ensures a correct start Press the second softkey to turn MEAS1 to ’on’ 50HOW to USE the InstrumentMEASUREMEAS1-PKPK Measure MEAS1-RMS Measure Meas 2-FREQ Measure DelayRemove the Probe Adjust signal from channel Press the first softkey to select ’delay’ Measure Cursor Limit 52HOW to USE the Instrument Measure TOUCH, Hold & Measure Procedure to set up for TOUCH, Hold and Measure is Processing Functions Press the softkey next to Math 1 to enter the Math 1 submenu Mathematics Filter 56HOW to USE the Instrument Switch Math 2 off againMathematics Multiply Analog Display Defl Display Functions 50Hz Digital Display Remove the signal from channel Digital Display Vert Magnify 60HOW to USE the InstrumentScope ’runs’ once and a signal appears on the screen Use the Track control to adjust Vert Magnify to Digital Display Interpolation Press the bottom softkey to select ’dots’Press the bottom softkey to select ’sine’ Screen displays two or four traces now 62HOW to USE the InstrumentConnect the Probe Adjust signal to channels 1 Press Autoset Digital Display Windows Press the Text OFF button to turn off the menu Delayed TimebaseDelayed Timebase Delayed Timebase DEL’DTB has two basic functions Press either key of the Del’dTB TIME/DIV keys 64HOW to USE the Instrument Delayed Timebase Trace SEP Delayed Timebase TriggerStart with the Standard Setup Press the Trig 1 key in the CH1 section a few times Press the softkey to select the TRIG’D mode Delayed Timebase Coupling Delayed Timebase Trigger Level First set the instrument to the standard setting Hard Copy FacilitiesSET Standard Now you are ready to make the hard copy Utility Print Setup9600, 8, N, 3wire, XON/XOFF=ON To set up the layout of the printer hard copy HP7475A, HP7470A, Hpgl = standard HPGL, PM8277 and PM8278 Utility Plot Setup Autoset Standard Autoset and Setup Utilities Position the trace in the bottom of the screen Setups72HOW to USE the Instrument Autoset User Programmable To recall a previously stored setting This setup can be saved in memory as follows Autocal Setup Text LabelSetup Recall a Sequence 74HOW to USE the Instrument Other Features Function Reference Function Reference Description Acquisition Length Key sequence Memory Expansion Toggle key to switch the inverted display of CH2 CH4 on/off ADD Invert SubtractINV ADD Mathematics Mathematical descriptionResult = S1 + S2 CPL QW Command to query a waveform Refer to for full details Remote commands ALT/CHOP Analog Mode Toggle softkey to select ALTernate or CHOPped modeAlternate and chopped modes are shown in the figures below Auto Range Toggle key to switch between analog mode and digital modeAuto Range Analog Key to start the autoset CPL AS Command for Auto Setup Refer to for full detailsAutoset Autoset Autoset Sequence Trig Autoset UserprogUtilityautoset Vert Autoset CPL AS Command for an Auto Setup Refer to for full details Control to select the Average factor Key to switch the Average function on or off Effect of bandwidth limiter CPL CL Command for Calibrate Refer to for full details Calibration AutocalCAL CHANNEL/TRACE Selection Confidence Check Power on OFF Cursors More than one channel is on, Desired channel for voltage CursorsVolt cursors are used for Voltage measurements. When Track Function Reference Cursors Both Measured Cursors Readout Time Function Reference Cursors Readout Volt Trigger position DelayFull description is given under Delayed Timebase Event delay CH1 Slope Delay Measurement Delayed Timebase DEL’D TB Delay Function of ’mtb+dtb’, Delay and Trace SEP Toggle switch to switch between analog mode and digital mode Digital Mode Interpolation Display Menu Lines are drawn between sample points Display Text Amplitude variation AM Variation FM or jitter Display of signal with External Trigger 2 Channels Models only Trig ViewAmpl Filter Glitch Trigger Hold OFF Using Hold OFF to suppress double triggering Control to adjust Main TB hold off timeHold OFF Function of key pair AMPL/VAR Input Attenuator Manual + Automatic Range Toggle key to switch the Auto Range function on/offInput Coupling Auto AC/DC Toggle key to switch a channel on/offInput Impedance 200 MHZ Models only AC/DC/GND Logic Trigger 4 Channels Models only StatePattern Refer to Glitch Trigger function To adjust t2Ift2 Glitch Function of the timebase magnifier and X POS control Magnify Horizontal Control to select the vertical magnification Magnify VerticalLeft side decreases the Magnify factor Function of vertical magnifier and Y POS control VAR ns Main Timebase Manual + Automatic46FUNCTION Reference Function of key pair TIME/DIV VAR Measure Menu Mathematics Following measurements are available VoltPositive and negative, preshoot positive and negative Multiply Mathematics Result = S1 x S2 Peak Detection POS Toggle key to switch the peak detection on/off Power Supply Toggle key to switch the oscilloscope on/offPrinting and Plotting Interface Printer or plotterLayout Real-time clock Toggle softkey to plot trace information Probe Utilities Status Remote Control IeeeKey to switch from remote to local Control to select the Ieee device address Remote Control RS-232 ParityOdd Even LL Inhibits front key Status Local Refer to for full details RUN/STOP Trace Rotation Rise time measurement using the graticuleScreen Controls and Graticule Screen controls and function Autocal Necessary Auto SettingScreen Messages Always Parity if 7 Bits No Average in Roll Mode Auto Setting UserprogramCalibration Error KEY Inactive When Stopped No Event Delay in TV Mode No DTB in Roll ModeNo Envelope in Roll Mode No Event DELAY, Dual Slope TIME/DIV Adjusted Setup EmptySetup Protected STD Setup = Recall only Setups Track Setups Sequence Standard Setup / Front Panel Reset Softkey to recall ’std’ settingsStd memory selection Status Screen Subtract mode is available in the digital mode of operation Subtract MathematicsResult = S1 S2 Control to select the Subtract process Text OFF Timebase Modes Acquired waveform is stored in a different memory location Flows ‘through’ the screen from left to right. When Roll isSelected, the TB Mode menu provides a ‘STOP on TRIGGER’ TRIGGER’ is set to ‘on’, the trace stops when the scope is Time Measurements Function Reference Time TOUCH, Hold & Measure Mode Trigger Coupling Ac dc lf-rej Trigger hf-rej Trigger DEL’D TB Delay Toggle softkey to switch DEL’D TB ’on’ Trigger Level control ranges in level-pp on and off Trigger Main TB Edge Function of Trigger Level and slopeTrig Toggle key to select CH1, CH.. or Exttrig as Main TB Slope to change between positive and negative trigger TV Trigger Key sequence Usertext Utility Maintenance Util Menu Utility Screen & Sound Sn = nth sample j=n=k Volt Measurements × S n Oversh Overshoot 100%Falling presh = Limit Deflection X-DEFL, X vs Y Toggle softkey to switch X vs Y on CPL Protocol Commands Program data separator AcknowledgeResponses Data Separators Program frame Example Program Frame 4THE CPL Protocol Commands in Functional Order Commands in Alphabetical Order Name Command Reference Acknowledge Command Response 8THE CPL Protocol ARM Trigger Calibrate 10THE CPL Protocol Default Setup GO to Local 12THE CPL Protocol GO to Remote Identity string Identification Example response Local Lockout HWL Program Communication16THE CPL Protocol Xonxoff Approx .5 sec after an acknowledge = 0 is received, Pds Count Node Program Setup18THE CPL Protocol Count Node Program Text PdsChar Char Character Description Examples of user text Pds Wavenr Sample checksum Admin Pds CountProgram Waveform 22THE CPL Protocol Action by Parameter Type Example Oscilloscope Notes Example LSB = Sample and &HFF Example program Numerical values of an infinite number of measurement Results is returned cancelling is possible by sending AsciiQuery Measurement 26THE CPL Protocol Value Parameter specified Value,value T2-trg Example of a single measurement MeasvaluePoint notation, e.g E-09 Or Hz Null Query Print Example Written in Quick Basic 30THE CPL Protocol Query Setup Count Number of strings to follow NodeOscilloscope, e.g =10 hex Example response PM3394 Complete setup query User text is returned Query Text Printed, e.g Query Waveform Admin Count Sample Checksum Parameter Type Example Wavenr The oscilloscope waveform source Input #1,NM$ Display SettingsSymbol Parameter Value Type Interpretation of waveform data Sensitivity DefinitionsFormula’s Sn = Yz + Yn * Yr * Yu Time base = 50 * Xr * Xu/div Time base Reset Instrument Recall Setup Pds Setup reg42THE CPL Protocol Represents the setup register number, ranging from 1 Save Setup 44THE CPL Protocol Status Example status 46THE CPL Protocol Trigger Acquisition Acknowledge Ok, normal situation Syntax errorExecution error Synchronization error Status Example program to investigate status Main Timebase settings SetupCommon vertical settings Common horizontal settings Measurement 1 settings Measurement 2 settings Hex Dec Meaning Events Trigger Delay settingsCursor settings Cursor autosearch settings Nnllxxxxxx.......xx Acquire Menu Structure Appendix a Acquire menu structure Digital Appendix B Cursors menu structure Cursors menu structure Display Menu Structure Appendix C Display menu structured Mathematics Menu Structure Appendix D Mathematics menu structure Measure Menu Structure Appendix F DTB DEL’D TB menu structure SAVE/RECALL Menu Structure Setups Menu Structure Appendix H Setups menu structure TB Mode Menu Structure Appendix J TB Mode menu structure Div T Appendix K Trigger menu structure Trigger menu structure Appendix L Utility menu structure Utility menu structure Vertical Menu Structure Vert Menu Vertical BW LimitOn off 50Ω CH1 50Ω CH2 50Ω CH3 50Ω CH4 DTR RS-232 Cable ConfigurationsRTS CTS Cable to controller with hardware handshake Cable to printer/plotter with hardware handshake Channels Simultaneously Sampled AT 100 MS/s Appendix P Channel Acquisitions Expansion and Interpolation Function Index Function Index see Chapter Function Index Index Measure Menu Time Measuremens Volt Measurements TOUCH, Hold & Measure ModeDelayed Timebase Trigger DEL’D TB Display and Probe Adjustment Display Functions Display Menu Glitch Trigger GND Input Coupling Printing and Plotting Remote Control IeeeInstallation Instructions Appendix N Util Maintenance Memory BACK-UP Batteries CHANNEL/TRACE Selection SetupsPrinting and Plotting Remote Control RS-232 Memory Functions Timebase Modes Autoset and Setup Utilities Setups Setups SequenceTimebase Modes Delayed Timebase Screen Messages Utility Screen & Sound Display Menu Deflection 8FUNCTION IndexAdvanced Vertical Functions Cursors Readout Measure Menu Volt Measurements