1-8
IM 704210-01E
1.5 Setting the Acquisition Conditions for Input
Signal to be Measured
Input Coupling
≡
For operating procedure, refer to 6.1
≡
When you want to measure only (AC components) of the input signal or only the signal
overlapping with the specified DC voltage, measurement can be facilitated if DC components are
removed from the signal. In other cases, you may want to measure all the AC and DC
components of the input signal. In these cases, an appropriate input coupling can be selected.
The following input coupling methods are available.
AC coupling
The signal is input to the amplifier through a capacitor. AC coupling is used to measure only the
amplitude of the input signal by removing DC components or measure only the signal which
overlaps the specified DC voltage.
Input terminal
Input
amplifier
DC coupling
The signal is input directly to the amplifier. DC coupling is used to measure all the AC and DC
components of the input signal
Input terminal
Input
amplifier
Input Impedance
≡
For operating procedure, refer to 6.1
≡
To reduce attenuation or distortion of the signal to be measured, an input impedance can be
selected from 50
Ω
and 1 M
Ω
to match the output impedance of the source of the signal.
Measurement Block
The instrument carries out a series of processes, from measurement to data processing and
display, repeatedly. The minimum block of each series of processes is called “measurement
block”. When the number of samples (number of data items) for each series is assumed to be N,
each series of processes (measurement, processing and display of N samples) is called “one-block
measurement”.
Samples S1, S2, S3 to SN within the measurement block are measured as shown below by
sampling pulses P1, P2, P3 to PN generated at the specified sampling intervals. (For setting the
sampling intervals, refer to page 1-10.)
When the period of the input signal is longer than the sampling interval
S1
S2
S3
SN
1 block
1 block
S1
S2
S3
Measurement block
Measurement block
Data processing,
display
Preparation
for measurement
P1
P2
P3
P4
P2
P3
P4
Input signal
Sampling
pulse
Sampling interval
