ADInstruments PowerLab 2/20 Owner's Manual page 26

Figure A–1
Block diagram of the
PowerLab 2/20.
REAR
PANEL
FRONT
PANEL
18
digital converter). The ADC can sample at a maximum rate of 100,000
samples per second. The sampling process is handled independently
of the processor core through a sampling control engine using direct
memory access. The CPU assembles groups of samples into blocks
and then transmits them to the computer, where the software
receives, records, and displays the data.
The external trigger input (marked 'Trigger' on the front panel)
allows either a voltage level or a contact closure to trigger recording.
2
I C Port USB Port
System
Glue
Chip
16-bit ADC
MULTIPLEXER
2 Differential Input
Amplifiers
Input 1
Analog Inputs
Serial Port
30 MHz
XTAL
PPC403 CPU
Input 2
IEC Mains
Input
Switching
16-bit DAC
RANGE
CONTROL
+1 –1
+ – External Trigger Input
Analog Output
PowerLab Owner's Guide
Power
Supply