App-16
IM DLM3054-03EN
Appendix 3 Block Diagram
Block Diagram of the Instrument
CH1
CH2
CH3*
CH4*
LOGIC*
External trigger
input
A/D
ATT
AMP
Buffer
ATT
CMP
Time base
A/D
ATT
AMP
A/D
ATT
AMP
A/D
ATT
AMP
Display
processing
circuit
Data processing circuit
Acquisition
memory
Display
memory
CPU
Main memory
LCD
Touch panel
Built-in printer
(option)
USB
(for peripheral devices)
USB
(For connecting to a PC)
Ethernet
GP-IB (option)
Internal storage
Keyboard
Video signal output
GO/NO-GO
determination output
(option)
Power
supply
Trigger output
* CH3, CH4, and LOGIC are available on the DLM3024, DLM3034,
and DLM3054.
Signal Flow of the Instrument
The signals received through the signal input terminals are first applied to the vertical control circuit
consisting of attenuators (ATT) and pre-amps (AMP). At the attenuators and pre-amps, the input signal
amplitude is adjusted according to the input coupling, probe attenuation, voltage scale (SCALE), offset
voltage, and other settings.
The adjusted input signals are then applied to the A/D converters. At the A/D converters, the voltage
levels are converted into digital data.
The digital data undergoes digital filtering as well as sampling and envelope processing at the sample
rate corresponding to the time scale setting (TIME/DIV) in the data processing circuit. Then, the
data is written in the acquisition memory. In addition, averaging and sorting of repetitive samples are
performed in the data processing circuit.
Here the data is converted into waveform display data by the data processing circuit, transferred to the
display processing circuit, and stored in the display memory.
The data stored in the display memory is displayed as waveforms on the LCD.
