![background image](http://html1.mh-extra.com/html/california-instruments/801p-series/801p-series_user-and-programming-manual_3434434030.webp)
User and Programming Manual - Rev H
California Instruments
May 2000
P Series
22
5.5 Oscillator Control Board
The Oscillator control board has the Microcontroller and all the control logic to generate a
programmable sine wave reference of the correct amplitude and frequency. It includes all the
control logic to respond to user commands from the front panel or the RS232 interface. It also
updates the displays to show the programmed settings and current measurements. Refer to
Figure 5-2 for a block diagram.
When the output is programmed above 5.0 volts, the multicolor LEDs, DS10 and DS9, on the
oscillator board will illuminate.
. Current
Current DAC
Curr. Sense/Fault
Sense
Frequency
Generation
Micro
Voltage DAC
Front
Controller
Panel
Control
Display
Sine Wave
Generation
OSC
Reference
DC
NVRAM
Supply
RS232
Option
Figure 5-2: Oscillator and controls
5.6 DC to AC Power Module
The DC to AC power Module takes a 250V DC input and generates 0 to 135 volts AC, directly
coupled, low range output. When the DC to AC module is supplied with 400 volts DC, the AC
module generates 0 to 270 volts AC. The AC voltage amplitude is controlled with the oscillator
boards. The output converter is a PWM full bridge topology with an LC filter on the output. The
switching frequency is 34.61kHz.