Extech Instruments 7630 Operation Manual page 67

Pressing NEUTRAL or GROUND softkey will toggle it between its two available states ON
and OFF. Pressing REVERSE softkey will toggle it between its three available states ON ,
OFF and AUTO. When REVERSE parameter is set to AUTO, system will measure the
circuits of REVERSE is ON and OFF and display the larger value after TEST key is pressed.
Line Configuration Setting
When the Neutral or Ground switches are set to the CLOSED position they are in a normal
operating condition. When the Neutral or Ground switches are set to the OPEN position they
are in a fault condition that represents a fault in the line input wiring.
When the REVERSE relay is set to ON, the relay is in position B (refer to Figure 2) and the
Line and Neutral conductors are reversed at the DUT power outputs. The power output is
represented as the power receptacle in Figure 2.
The three switches may be configured into eight different combinations of Line conditions.
The different combinations are represented in the table below (refer to Figure 2).
STEP NEUTRAL REVERSE GROUND
S1
1 CLOSED
2 CLOSED
3 OPEN
4 OPEN
5 CLOSED
6 CLOSED
7 OPEN
8 OPEN
9 CLOSED
10 OPEN
11 CLOSED
12 OPEN
State 1：S1：CLOSED、 S2：A 、 S3：OPEN
S2 S3
A (OFF) OPEN
B (ON) OPEN
A (OFF) OPEN
B (ON) OPEN
A (OFF) CLOSED
B (ON) CLOSED
A (OFF) CLOSED
B (ON) CLOSED
AUTO OPEN
AUTO OPEN
AUTO CLOSED
AUTO CLOSED
DUT Line
Configuration
State 1
State 2
State 3
State 4
State 5
State 6
State 7
State 8
State 1 & 2
State 3 & 4
State 5 & 6
State 7 & 8
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