1-1
IM 704210-01E
Functions
1
1.1 System Configuration and Block Diagram
System Configuration
HP-GL compatible plotter
• Hard copy
• Set-up information list
Input signal
Personal computer
• Remote control
• Data collection/analysis
Object to be
measured
Communication
Inhibit input
External arming input (the terminal
is shared with external gate input)
Reference input
Monitor output
Reference output
Saving and loading of
data from a floppy disk
Block Diagram
Reference
Clock
LCD
&
Touch Panel
GP-IB
FDD
CPU
Acquisition
Memory 1
Memory
Contoroller
Measuring
Controller
&
Fractional
Pulse
Generator
PLL
Clock
Generator
Signal
Multiplexer
Input
Amplifier
Trigger
DAC
Ach IN
Bch IN
Reference
IN
Reference
OUT
Ach Monitor
OUT
Bch Monitor
OUT
EXT ARM IN
INHIBIT IN
T/V
Converter
&
Data
Generator
Acquisition
Memory 2
Memory
Contoroller
10MHz-TCXO
Comparator
Comparator
Time Measuring Unit 2
Time Measuring Unit 1
Input
Amplifier
Trigger
DAC
T/V
Converter
T/V
Converter
T/V
Converter
Counter
&
Data
Generator
Clock
Inhibit Signal
External Arming Signal
10MHz
10MHz
CPU BUS
Acquisition BUS
Counter
Signal Flow
The signal input to the input terminal (Ach IN, Bch IN) is converted into a low-impedance signal
by the input amplifier. It is then sent to the comparator, where it is converted to a binary signal.
At the same time, the signal from the input amplifier is output as a monitor signal via the output
terminal (Ach Monitor OUT, Bch Monitor OUT).
The signal multiplexer selects the binary signal according to the selected measurement function
(item), then the signal is input to the measuring controller. The measuring controller controls
measurement and creates fractional pulse according to the external arming signal and inhibit
signal. The width of the fractional pulse is measured, with a resolution of 100 ps, by the T/V
converter of the time measuring unit (1, 2), and then compared with the value on the digital
counter, to provide measured data. With continuous measurement, two time measuring units (1,
2) are activated alternately.
In time stamp mode (see the following page), both measured value and time stamp data (elapsed
time) are acquired in each acquisition memory (1, 2). In hardware histogram mode (see the
following page), the frequency of each measured value (i.e. number of the same measured values)
is acquired in each acquisition memory. The acquired data is then sent via the memory controller
to a CPU, where it is used for statistical computation or displayed on the LCD.
Either the signal from the internal crystal oscillator (compensated against temperature drift) or an
external reference signal (input to the Reference IN terminal) can be used as the reference clock.
In either case, the reference clock is output through the 10-MHz band pass filter to the Reference
OUT terminal.
