MR8740T_Quick guide_eng_20191016H.pdf - 第98页

92 Specications of Model MR8740T T rigger T rigger method Digital comparison method T rigger conditions Logical AND or OR operation among each trigger source and the interval trigger T rigger source Analog, logic • Up t…

Specications 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.

Specications

Specications 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-dened voltage level.

Voltage drop trigger: The instrument is triggered when the peak voltage of an input

signal falls below a user-dened 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 dened by an upper level and lower level, shall

previously be specied.

The instrument is triggered when an input signal voltage falls within

(IN) or outside (OUT) the user-dened range.

Period trigger*: A period-measuring level and a period range shall previously be

specied.

The instrument measures periods by acquiring moments when

a voltage exceeds (or falls below) a user-dened level and is

triggered when a period falls outside or within the user-dened

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

specied.

The instrument measures pulse widths by acquiring moments when rising

edges (or falling edges) cross the user-dened level and is triggered

when a signal pulse width becomes narrower than the user-dened 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 specied (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-dened number. (Not available when the

trigger condition is set to AND operation.)

Logic trigger Pattern trigger dened 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-dened measuring interval (in hours, minutes, and

seconds).

The instrument is triggered at the start of a measurement and then repeatedly triggered at

a user-dened 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

Specications 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 satised

Displays and stores channel numbers and measured values, puts marks, and beeps

When the trigger conditions are not satised

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 specied number of values and species 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.

Specications