6243/44 DC Voltage Current Source/Monitor Operation Manual
4.14.2 Operating Principles
4-64
4.14.2 Operating Principles
The following is a simple explanation of the block diagram for the 6243/44’s source and measurement sec-
tions shown in Figure 4-27.
• The 6243/44 contains the DA converter VDAC for setting the voltage source and the voltage limiter.
The 6243/44 also has the DA converter IDAC for setting the current source and the current limiter.
Each of the DA converters features a conversion accuracy of 16 bits.
The output from the DA converter is input to the 4 error amps V+, V-, I+, and I-. However, in the V-
and I- error amps a reversed output is supplied. (from A
10
, A
11
)
• The 4 error amps are connected as follows:
For voltage source with + output, connected are V+ error amp and I+ and I- error amps for current
limiter use.
For voltage source with - output, the V- error amp, I+ and I- error amps are connected for current lim-
iter use.
For current source with + output, the I+ error amp, V+ and V- error amps are connected for voltage
limiter use.
For current source with - output, I+ error amp, V+ and V- error amps are connected for voltage limiter
use.
This enables both + and - limiter control for both voltage source and current source.
• 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 both current
source and current limiter.
• Voltage range is switched for A
6
and A
9
, respectively, and the voltage measurement always takes
place in the same range as that of both voltage source and voltage limiter.
•The A
9
amp makes up the measurement ranging circuit.
•The A
6
and A
7
amps have high input impedance to minimize leak.
•The A
8
amp also has high input impedance to reduce error for 4-wire connection.
• The AD converter employs integral type AD, and the integration time can be set between 500 s to
100 PLC.
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