6146/6156 DC Voltage/Current Generators Operation Manual
4.4 Operational Principles
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4.4 Operational Principles
4.4.1 Block Diagram
Figure 4-20 Block Diagram
4.4.2 Operational Principles
• The 6146/6156 contains a SrcDAC DA converter for setting the voltage source or current source.
The 6146/6156 also has the HiLimitDAC and LoLimitDAC DA converters for setting the current
limiters and the voltage limiters.
The output from the DA converters is input to three error amplifiers, Src AMP, HiLmt AMP, and
LoLmt AMP respectively.
• For voltage source, the SrcDAC becomes a voltage-source DAC, and Src AMP becomes a voltage-
source error amplifier.
Also, HiLimitDAC becomes a DAC for current limiter on the HI side and the HiLmt AMP becomes
an error amplifier for current limiter on the HI side.
Likewise, LoLimitDAC and LoLmt AMP work as current limiter on the LO side. At this time, the
switch of each part is connected to the V side to bring to voltage output status. However, in the 30
mV range or 300 mV range for voltage source, SW4 and SW5 are connected to the DIV side so that
the voltage is divided by the resistors.
For current source, the use of each DAC and error amplifier is switched; for the switch is connected
to the I side respectively to generate 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.
Switching circuit
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