6243/44 DC Voltage Current Source/Monitor Operation Manual
4.5.5 Reverse Polarity Source Operation
4-28
4.5.5 Reverse Polarity Source Operation
When 6243/44 is used with the current source function (IS), the current is normally output with the spec-
ified polarity. (Figure 4-16 a) However, when an external source is connected, the voltage limiter (V
L
) is
smaller than the external source (V
B
) and the output current cannot be output with the specified polarity,
the 6243/44 output current with the reversed polarity. (Figure 4-16 b)
This operation status is called “reverse polarity source operation.”
The source accuracy in reverse polarity source operation is found by adding approximately 300 digit error
to the reverse limiter total accuracy found in Chapter 9, “SPECIFICATIONS.”
Figure 4-16 Reverse Polarity Source Operation
NOTE:
1. For the voltage source function (VS), the operation becomes a “reverse polarity source operation” under the
following conditions. However, this condition should not be used because the condition is occurs immediately
before an overload due to the current restriction by the current limiter (I
L
) not functioning in this condition.
Conditions: The following 3 conditions must be met at the same time.
The polarities of V
S
and V
B
are different.
|V
S
| |V
B
|
The difference between |V
S
| and |V
B
| is small.
2. If the difference between |V
S
| and |V
B
| becomes large under the above conditions, an overload will occur and
the 6243/44 will enter Standby.
(a) VL>VB (Normal operation) (b) VL<VB (Reverse source operation)
V
L
V
B
+Is
-IsIs
V
B
+Is
V
L
Even if +IS is set, +IS is output when V
L
V
B
,
and -IS is output when V
L
V
B
.
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