California Instruments 2001RP, User And Programming Manual

Page: 46 / 130

User and Programming Manual - Rev N
5 Principle of Operation
5.1 General
An explanation of the circuits in the AC Source is given in this section. Refer to block
diagram in figure 5-1.
5.2 Overall Description
Input power at the rear panel is routed through the EMI filter and circuit breaker to the high
current rectifier and the Power Supply Assembly, A6. The various DC supply outputs then
go to the Mother Board, A4, then are directed to other modules.
The Programmable Oscillator Assembly, A8, generates the oscillator waveforms, power
source controls and measurement signals. The oscillator assembly is connected to the rest
of the power source through the Oscillator Interface Board, A3.
The Amplifier Module, A7, takes its DC supply voltages and input signal from the Mother
Board, A4. It produces the high power output for the primary of the output transformer, T1.
The output is routed through the Mother Board to the output transformer.
The Range Relay Board is identified as A2. This board assembly configures the
secondaries of the output transformers for the correct output voltage range. The output from
the AC Power Source is taken from the Range Relay Board.
The Current Limit Board is identified by A5. This board controls the amplifier gain and the
Programmable current limit.
5.3 Input Power Supply
This assembly is identified as A6. It generates the high power +300 VDC supply used for
the power amplifier. This supply uses a 20A fuse (F2) to protect the amplifier.
The input power supply also has circuits that generate auxiliary DC voltages identified as
±
18V,
±
15VSW and +8 ISO.
The
±
18V supplies are used for the oscillator. The +8 ISO is used for the RS232/GPIB
board. The
±
15VSW supplies are used for the Amplifier Module.
The input power supply also generates 50 VDC and 15VSW1 from the 300 volt DC supply.
The 50 VDC is used for fan and relay operation, +15VSW1 is used for the gate drive signal
in the Amplifier Module. The switching circuit that generates these voltages is protected with
a 1/2A fuse (F1).
2001RP April 2007 37