MR8740T_Quick guide_eng_20191016H.pdf - 第99页
93 Specications of Model MR8740T T rigger mark T rigger marks, which indicate the positions of trigger events, can be displayed. T rigger timing Start Alert function The alert function and trigger function other than th…
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Specications of Model MR8740T
Trigger
Trigger method Digital comparison method
Trigger conditions Logical AND or OR operation among each trigger source and the interval trigger
Trigger source Analog, logic
• Up to 108 channels
(Up to four analog triggers are available for one analog channel.)
(Up to four logic triggers are available for one logic probe.)
External trigger
The instrument immediately starts a measurement (freely running) when all trigger sources
are set to off.
Analog trigger
Level trigger: The instrument is triggered when an input signal voltage exceeds (or
falls below) a user-dened voltage level.
Voltage drop trigger: The instrument is triggered when the peak voltage of an input
signal falls below a user-dened voltage.
(Dedicated to 50 Hz / 60 Hz commercial power)
(Not available when Model MR8990 Digital Voltmeter Unit, Model
U8991 Digital Voltmeter Unit, or Model 8970 Freq Unit is used.)
Window trigger: A range, which is dened by an upper level and lower level, shall
previously be specied.
The instrument is triggered when an input signal voltage falls within
(IN) or outside (OUT) the user-dened range.
Period trigger*: A period-measuring level and a period range shall previously be
specied.
The instrument measures periods by acquiring moments when
a voltage exceeds (or falls below) a user-dened level and is
triggered when a period falls outside or within the user-dened
range.
(Not available when Model MR8990 Digital Voltmeter Unit, Model
U8991 Digital Voltmeter Unit, or Model 8970 Freq Unit is used.)
Glitch trigger*: A voltage level and a pulse width (glitch width) shall be previously
specied.
The instrument measures pulse widths by acquiring moments when rising
edges (or falling edges) cross the user-dened level and is triggered
when a signal pulse width becomes narrower than the user-dened pulse
width.
(Not available when Model MR8990 Digital Voltmeter Unit or U8991
Digital Voltmeter Unit is used.)
Event designation: The number of events shall previously be specied (1 to 4000).
The instrument counts the number of times the trigger condition
of each trigger source is met and is triggered when the number of
events exceeds the user-dened number. (Not available when the
trigger condition is set to AND operation.)
Logic trigger Pattern trigger dened by 1, 0, or disregard (×)
Forcible trigger Available (A forcible trigger can trigger the instrument in priority to any trigger sources.)
Interval trigger Data can be recorded at a user-dened measuring interval (in hours, minutes, and
seconds).
The instrument is triggered at the start of a measurement and then repeatedly triggered at
a user-dened measurement interval.
Trigger lter Off, 10, 20, 50, 100, 150, 200, 250, 500, 1000, 2000, 5000, 10000 (samples)
Trigger level
resolution
1 LSB (12-/16-bits unit)
256 LSB for Model MR8990 Digital Voltmeter Unit and Model U8991 Digital Voltmeter Unit
(Uses only higher 16 bits of an A/D resolution of 24 bits.)
Pre-trigger 0% to 100% (freely settable in one percentage point increments)
The instrument displays waveforms acquired during the pre-trigger period.
Trigger priority On/Off
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Specications of Model MR8740T
Trigger mark Trigger marks, which indicate the positions of trigger events, can be displayed.
Trigger timing Start
Alert function The alert function and trigger function other than the analog trigger setting are mutually
exclusive.
Available sampling rate: 100 kS/s or less
When the trigger conditions are satised
Displays and stores channel numbers and measured values, puts marks, and beeps
When the trigger conditions are not satised
Displays and stores channel numbers and measured values, puts marks, and turns off a
buzzer sound.
Auto-trigger level On/Off (for the trigger and alert functions)
Acquires the specied number of values and species the average value of them as the
reference of the window-out trigger.
Choose a number of samples from among 100, 200, 300, 400, and 500.
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Specications
94
Specications of Model MR8740T
Waveform screen
Display format
Time-domain
waveform
representation:
1, 2, 4, 8, 16 screens
(Up to 64 channels can be displayed on each sheet.)
(Every channel can be set to be displayed on multiple sheets.)
Sheet function Up to 16 sheets
A display format can be chosen for each sheet.
Zoomed display On/Off
Displays time-domain waveforms on the upper waveform screen and zoomed waveforms
on the lower screen.
Full-screen display Maximizes the waveform screen to full screen.
Waveform display Waveform color: Fixed colors (32 colors)
Interpolation: Line
Variable display: Always on
Vernier: Amplitudes of inputted waveforms can be adjusted. (Adjustable
range: 50% to 200% of input)
Grid: Off/On
Logic width: Wide, standard, narrow
Inverted waveform: Polarity-reversed waveforms can be displayed.
(Not available for Model 8967 Temp Unit, Model 8970 Freq Unit, or
Model 8973 Logic Unit)
Zoom in/out Waveforms can be displayed at a preferred magnication.
Waveform scrolling The operator can scroll through waveforms horizontally by dragging the display.
Scrolling through waveforms backward is available during a measurement.
Rolling display Latest data is always displayed following the measurement.
The drawing starting position can be chosen between the left edge and right edge.
(The rolling display is not available when the overlay setting is used.)
Level monitor
function
Numeric value representation
Overlaying
waveforms
Overlaying setting can be selected from off, automatic, manual.
(The rolling display is not available when the overlay setting is used.)
Cursor
Trace cursor: Up to 8 cursors can be displayed.
(Displays potential, time from trigger, time lag between cursors, and
potential difference between cursors.)
Horizontal cursor: Up to 8 cursors can be displayed.
(Displays potential and potential difference between cursors.)
Gauge: Up to 8 cursors can be displayed.
Section designation: Section cursor 1 or section cursor 2
(Species calculation range, save range, and search area.)
Jump: Jumps to the position specied by clicking the screen.
Event mark Event marks can be put during measurement (up to 10,000 marks)
by clicking the start icon or inputting an external signal.