MR8740、MR8741_user_manual_eng_20191016H.pdf - 第359页

17.3 Trigger Section 347 Chapter 17 S pecifications 16 17 Peak hold Included Averaging Time axis, simp le average of frequency axis, indexed average, peak hold (frequency axis), number of times (2, 4, 8, ... 10,000) Auto…

17.2 Measurement Functions

346

17.2 Measurement Functions

17.2.1 Memory Function

Timebase 5, 10, 20, 50, 100, 200, 500 s/div

1, 2, 5, 10, 20, 50, 100, 200, 500 ms/div

1, 2, 5, 10, 30, 50, 100 s/div

1, 2, 5 min/div

Time axis resolution 100 points/div

Sampling period 1/100th of timebase

Recording length Fixed recording length: 25, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000, 100000 div

Arbitrary recording length: Can be set in units of divisions (up to 160,000 div)

Screen Settings 1 screen, 2 screens, 4 screens, 8 screens, 16 screens, X-Y 1 screen, or X-Y 4 screens

Interpolation function Line, line and dot (with X-Y)

Waveform scrolling Left-right scrolling is available, Backward scrolling is available during Roll Mode display

Overlay function Automatic: Always overlays when starting, and clears by restarting

Manual: Overlays only necessary waveforms, and clears them as needed

Automatic saving Automatically saves data on USB memory stick after measuring (binary or text)

When sampling is slow, saving starts during recording.

Automatic print Automatically prints data after measurement (Sends print data to PC connected via LAN,

Model 9333 LAN communicator is required.)

Manual print The "Send Print Key" function of Model 9333 LAN communicator is utilized

Report print The "Send Print Key" function of Model 9333 LAN communicator is utilized

17.2.2 Recorder Function

Timebase 10, 20, 50, 100, 200, 500 ms/div

1, 2, 5, 10, 30, 50, 100 s/div

1, 2, 5, 10, 30 min/div, 1 h/div

Time axis resolution 100 points/div

Sampling period 1, 10, 100 s

1, 10, 100 ms (not more than 1/100th of the selected timebase)

Recording length Fixed recording length: 25, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000 div

Adjustable recording length: Can be set in units of divisions (up to 80,000 div)

Continuous

Screen and Printing Settings 1, 2, 4, 8 or 16 screens

Waveform Storage The most recent 80,000 divisions of measurement data is retained in internal memory

Waveform Scrolling Left-right scrolling by Jog and Shuttle knobs. Including backward scrolling during measurement

Automatic saving Automatically saves data on USB memory stick after measuring (binary or text)

When sampling is slow, saving starts during recording.

Manual print The "Send Print Key" function of Model 9333 LAN communicator is utilized

Report print The "Send Print Key" function of Model 9333 LAN communicator is utilized

17.2.3 FFT Function

Frequency range 133 mHz to 8 MHz, external

Dynamic range 72 dB (Theoretical value ), 96dB (Theoretical value)(When the 8968 High Resolution Unit is used)

Number of sampling points 1000 points, 2000 points, 5000 points, 10000 points

Frequency resolution 1/400, 1/800, 1/2000, 1/4000

Anti-aliasing filter Coupled with the frequency range, the cutoff frequency is automatically set.

(Only when using the Model 8968 High Resolution Unit or Model U8979 Charge Unit)

Analysis channel setting Can be selected from desired channels

FFT analysis modes Storage waveform, linear spectrum

, RMS spectrum

, power spectrum

, cross power spectrum,

auto-correlation function, histogram, transfer function, cross-correlation function, impulse response,

coherence function, 1/1 octave analysis, 1/3 octave analysis, LPC analysis, phase spectrum

* The total harmonic distortion (THD) is displayed when the cursor display is ON.

Display formats Single , Dual, Nyquist display, running spectrum display

Window Rectangular window, Hanning, Hamming, Blackman, Blackman Harris, Flat top, Exponential

Display scale Linear, log

17.3 Trigger Section

347

Chapter 17 Specifications

Peak hold Included

Averaging Time axis, simple average of frequency axis, indexed average, peak hold (frequency axis),

number of times (2, 4, 8, ... 10,000)

Automatic print Automatically prints data after measurement (Sends print data to PC connected via LAN,

Model 9333 LAN communicator is required.)

Manual print The "Send Print Key" function of Model 9333 LAN communicator is utilized

Report print The "Send Print Key" function of Model 9333 LAN communicator is utilized

17.3 Trigger Section

Trigger method Digital comparison

Trigger modes • Single, Repeat, Automatic (Memory function, FFT function)

• Single, Repeat (Recorder function)

Trigger source MR8740: Block I Analog Unit (Ch1 to Ch32), 8 Standard Logic Channels

Block II Analog Unit (Ch1 to Ch22), 8 Standard Logic Channels

MR8741: Analog Unit (Ch1 to Ch16), 16 Standard Logic Channels

Independent trigger criteria settable for each channel

Free-run operation occurs when all trigger types are off.

Manual trigger Trigger operated by the manual trigger key of the Memory HiCorder

Timer trigger Trigger depending on the time and interval settings

External trigger (MR8741 only) External signal is used as trigger.

Trigger criteria AND or OR of each trigger source

Trigger types (analog) • Level Trigger

Set digitally as a voltage value below full-scale

• Voltage Sag Trigger (Drop)

Triggering occurs when peak voltage falls below the specified level (for commercial power).

(for 50/60 Hz commercial power)

• Window Trigger

Upper and lower trigger threshold levels are specified

Triggering occurs when the signal enters or exits the defined threshold range.

• Period Trigger

A trigger period reference voltage level and period range are specified

The period of the signal rising (or falling) through the specified level is measured, and triggering

occurs when the period is outside of the specified range.

• Glitch Trigger

Set voltage level and pulse width (glitch width)

Triggering occurs when the signal pulse width is narrower than the specified pulse width defined

as rising (or falling) through a specified voltage level.

• Event Trigger

Triggering occurs when the event values specified for the level or glitch trigger are exceeded.

Triggering occurs when the input rises above (or falls below) the specified trigger voltage level.

Trigger types (logic) Pattern (mask) trigger by 1, 0, or x (x: don't care)

External trigger

(MR8741 only)

External signal is used as trigger.

Trigger filter OFF, 0.1, 0.2, 0.5, 1.0, 1.5, 2.0, 2.5, 5.0, 10.0 div (Memory function, FFT function)

OFF, ON: 10 ms fixed (Recorder function)

Trigger level resolution 0.1% f.s. (f.s. = 20 div)

Pre-trigger Applicable to memory function or FFT function

% setting: 0, 2, 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 95, 100, -95%

div setting: Setting by units of 1 div

Trigger priority Off/On

Trigger synchronization

(MR8740)

Synchronization between block I and block II (by using external trigger)

Offset between blocks of the larger value of 1 µs or 3 samples or less

Trigger marker Trigger marks indicate positions of trigger events

Trigger timing Start (All functions), stop (Recorder function), Start & stop (Recorder function)

Trigger Output

(MR8741 only)

Open collector output

With 5 V voltage output, active low, low output level 0 V to 0.5 V (current of 15 mA)

Pulse width for level setting: (sampling rate × number of data points after trigger) or more

Pulse width for pulse setting: 2 ms±1 ms

17.4 File Specifications

348

Data Saving

Data Loading

Others

17.4 File Specifications

Supported storage media USB memory stick, Internal RAM, LAN (Model 9333 LAN Communicator)

Saved data MR8740: Setting data, measurement data, screen image, print image

MR8741: Setting data, measurement data, screen image, print image,

waveform evaluation conditions, waveform evaluation areas

Saving types • Setting data (.SET) (Only setting configurations can be saved to internal RAM)

• Measurement data

Binary format (.MEM, .REC, .FFT), Text format (.TXT)

• Index , Memory division (.SEQ), division save (.IDX)

• Screen image (.BMP)

• Print image (.BMP)

• Waveform evaluation conditions (.ARE) *Evaluation area + Saving settings (MR8741 only)

• Waveform evaluation area (.BMP) *Saving of evaluation area (MR8741 only)

Arbitrary waveform data (.WFG) (when Model U8793 is installed)

• Generation program data (.FGP) (when Model U8793 is installed)

• Pulse pattern data (.PLS) (when Model MR8791 is installed)

File name entry Alphanumerics and Japanese

Saving range Whole range, or between A/B cursors

Data thinning save When saved in text format

OFF, 1/2, 1/5, 1/10, 1/20, 1/50, 1/100, 1/200, 1/500, 1/1000

Division save When saved in binary format

16 MB, 32 MB, 64 MB

Duplicate file name handling Auto: If a file with the same name exists, saves the file, adding a 4-digit number at the begin-

ning of the file name.

Serial: Saves the file, adding a 4-digit number at the beginning of the file name.

Overwrite: If a file with the same name exists, overwrites the file.

Error: If a file with the same name exists, an error message will be displayed.

Selection of blocks to be

saved

Saves the selected blocks when dividing the memory

Selection of channels to be

saved

Selects the channels to save (measurement data, calculation data), all channels

Supported storage media USB memory stick, Internal RAM

Loadable data types MR8740: Setting data, measurement data, analysis data

MR8741: Setting data, measurement data, analysis data,

waveform evaluation conditions, waveform evaluation area

Loadable data formats • Setting data (.SET) (Setting configurations can only be saved to internal RAM)

• Measurement data

Binary format (.MEM, .REC, .FFT)

• Index memory division (.SEQ), division save (.IDX)

• Waveform evaluation conditions (.ARE)

Evaluation area + Loading a setting configurations (MR8741 only)

• Evaluation area (.BMP)

Loading a evaluation area (MR8741 only)

• Arbitrary waveform data (when Model U8793 is installed)

• Generation program data (.FGP) (when Model U8793 is installed)

• Pulse pattern data (.PLS) (when Model MR8791 is installed)

Loading method New

Display file information Included

Delete data Single or multiple file selections

Sort files By name, date, size, extension

Ascending order, descending order

Rename file Included

Directory Create, rename and delete

Copy file Copy to other media

One-Touch saving The saving format and data specified in advance can be saved with a single action

(One-Touch saving via SAVE key or a mouse click).