MR8740T_Quick guide_eng_20191016H.pdf - 第97页
91 Specications of Model MR8740T External sampling input Maximum input voltage 10 V DC Input voltage High level: between 2.5 V and 10 V , low level: between 0 V and 0.8 V Acceptable pulse width High-level period: 50 ns …
90
Specications of Model MR8740T
5. External control terminals
Terminal block Push-button type
External input
Maximum input
voltage
10 V DC
Input voltage High level: between 2.5 V and 10 V
Low level: between 0 V and 0.8 V
Acceptable pulse
width
High-level period: 50 ms or longer
Low-level period: 50 ms or longer
Pulse interval 200 ms or more
Number of terminals 2
Functions START, STOP, START/STOP, SAVE, ABORT, EVENT
External output
Output format Open-drain output (equipped with a 5-volt voltage output, active-
low)
Output voltage High level: between 4.0 V and 5.0 V
Low level: between 0 V and 0.5 V
Maximum input
voltage
50 V DC, 50 mA, 200 mW
Number of terminals 2
Functions Judgment (pass), judgment (fail), occurrence of an error, busy,
waiting for a trigger
External trigger
Maximum input
voltage
10 V DC
External trigger lter On/Off
Acceptable pulse
width
When the external trigger lter is off
High-level period: 1 ms or longer
Low-level period: 2 µs or longer
When the external trigger lter is on
High-level period: 2.5 ms or longer
Low-level period: 2.5 ms or longer
Functions The edge to be used can be chosen between rising and falling.
Rising: Triggered when a pulse rises from the low level
(between 0 V and 0.8 V) to the high level (between 2.5 V
and 10 V).
Falling: Triggered when a pulse falls from the high level
(between 2.5 V and 10 V) to the low level (between 0 V
and 0.8 V), or when the terminals are connected with
each other.
Trigger output
Output format Open-drain output (equipped with a 5-volt voltage output, active-
low)
Output voltage High level: between 4.0 V and 5.0 V
Low level: between 0 V and 0.5 V
Maximum input
voltage
50 V DC, 50 mA, 200 mW
Output pulse width The pulse width to be used can be chosen between level and
pulse.
Level: [(sampling interval) × (number of data sets after trigger)] or
more
Pulse: 2 ms ±1 ms
91
Specications of Model MR8740T
External sampling
input
Maximum input
voltage
10 V DC
Input voltage High level: between 2.5 V and 10 V, low level: between 0 V and
0.8 V
Acceptable pulse
width
High-level period: 50 ns or longer, low-level period: 50 ns or longer
Maximum input
frequency
10 MHz
Functions External sampling clock input
The edge to be used can be chosen between rising and falling.
5
Specications
92
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