6241A/6242 DC Voltage Current Source/Monitor Operation Manual
5.4 Operational Principles
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5.4 Operational Principles
5.4.1 Block Diagram
5.4.2 Operational Principles
• The 6241A/6242 contains a SrcDAC DA converter for setting the voltage source or current source.
The 6241A/6242 also has the HiLimitDAC and LoLimitDAC DA converters for setting the cur-
rent-limiter and the voltage limiter.
The SrcDAC has 16 bit conversion accuracy, and the HiLimitDAC and LoLimitDAC have 13 bit
conversion accuracy.
The output from the DA converters is input to three error amps, Src (A1), HiLmt (A2), and LoLmt
(A3) respectively.
• For voltage source, the SrcDAC becomes the voltage-source DAC, and Src error-amp (A1) becomes
the voltage-source error-amp. Also, HiLimitDAC becomes the DAC for the current-limiter on the
Hi-side and the HiLmt error amp (A2) becomes an error amp for current-limiter on the Hi-side.
Likewise, LoLimitDAC and LoLmt error amp (A3) work as current-limiter on the Lo side.
At this time, for SW1 and SW2 in the feedback circuit, 0 is ON for SW1 and 1 is ON for SW2.
For current source, the use of each DAC and error amp are switched; for SW1 1 is ON and for SW2
0 is ON to generate the current.
• Source and limiter are switched by the switching circuit shown in the above figure, comparing the
feedback amount for each, then switching to the larger one.
• Current range switching is done by switching the current detection resistor Rs. Consequently, the
current measurement always takes place in the same range as that of current source or current-lim-
iter.
HiLimit
DAC
Src
DAC
LoLimit
DAC
ADC
A1
A2
A3
HiLmt
Src
LoLmt
A4
RS2
A6
SW2
SW1
VM
IM
RS1
A5
A7
HI SENSE
HI OUTPUT
LO SENSE
LO OUTPUT
A9
SW3
VM
IM
0
1
0
1
Switching circuit
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