1-9
IM 704210-01E
Functions
1
When the period of the input signal is shorter than the sampling interval
S1
1 block
Measurement block
Data processing,
display
1 block
Measurement block
P1
P2
P3
P4
P2
P3
P4
Input signal
Sampling
pulse
Sampling interval
S2
S3
S4
SN
S1
S2
S3
S4
P1
PN
Preparation
for measurement
Trigger Mode/Trigger Level
≡
For operating procedure, refer to 6.1
≡
The instrument allows the user to specify the level at which measurement is to be carried out.
This level is called trigger level.
Single auto trigger
The center level of the amplitude of the input signal is set as the trigger level automatically during
the cycle just before the first measurement block. This trigger level will be used for all the
subsequent measurement blocks.
Repeat auto trigger
The center level of the amplitude of the input signal is set as the trigger level automatically during
the cycle just before each measurement block. Unlike the single auto trigger, the trigger level is
set for each measurement block.
Half of
the amplitude
Half of
the amplitude
Amplitude
(Input signal)
Trigger level is set
Measurement block
A trigger is caused.
Trigger level
Manual trigger
The level set using the rotary knob or front panel keys is set as the trigger level.
Gate
≡
For operating procedure, refer to 6.2
≡
The instrument allows the user to specify the size of measurement block. Measurement can be
carried out as many as the specified number of events or during the specified gating time (i.e.
while the gate is open). Three types of gate are available.
Event gate
Each sampling is called an event. For instance, one measurement of the period of the input signal
is counted as one event. Up to 32,000 events (16,000 events for duty ratio/phase difference
measurement) can be set in the case of time stamp mode and up to 99,999,999 events can be set in
the case of hardware histogram mode, within 320 seconds following the arming (see the following
page).
Time gate
Gating time of up to 10 seconds can be set. However, the maximum number of events allowed
for the sampling mode must not be exceeded.
External gate
The external arming input terminal (EXT ARM IN) is used to open/close the gate(See the
following page). The gate can be opened for up to 320 seconds, as long as the maximum number
of events allowed for the sampling mode is not exceeded. In addition, it is possible to select
whether to open the gate using the positive or negative edge of the external arming signal.
1.5 Setting the Acquisition Conditions for Input Signal to be Measured
