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Figure A–2
Block diagram of the
PowerLab 4/20.
REAR
PANEL
FRONT
PANEL
Appendix A — Technical Aspects
Note that for either mode the trigger signal must be present for at
least 5 µs to register as an event. When a trigger event occurs, the
trigger indicator light will glow yellow.
When set up through software to use a voltage level, a trigger event is
registered when the voltage exceeds 2.9 volts. The trigger input is
optically isolated when set up for a voltage level. In the external
contact closure mode, the trigger input will respond to a direct short
between the centre pin and outer ring of the BNC. This can be
2
I C Port
USB Port
System
Glue
Chip
16-bit ADC
MULTIPLEXER
2 Differential Input
Amplifiers
Input 1
Input 2
Analog Inputs
Serial Port
30 MHz
XTAL
PPC403 CPU
2 Single-ended Input
+1
Amplifiers
Input 3
Input 4
Analog Output
IEC Mains
Input
Switching
Power
Supply
16-bit DAC
RANGE
CONTROL
–1
+
–
External Trigger Input
19
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