Page 10
3.
Terminals and Controls
3.1
Terminals
Figure 2: Rear panel of 1427
Resistance output is available either on R4W or on R2W output terminals.
2 and 4 wire connection and, if the decade is used as Pt/Ni temperature sensor simulator, 2, 3 and 4 wire
connection is available at the upper four Terminals, R4W. The resistance range of these Terminals lies
between 1
Ω and a maximum R
= 10
kΩ. The upper limit
of “R” depends on the setting of the parameter
4W < 2W (refer to chapter 5.2.3).
The lower line of terminals, with the label R2W, can only be used for 2 wire connection. The total
resistance range at these terminals is from R = 1
Ω to 1.2
MΩ. The v
alue of the lower limit R depends on
the setting of the parameter 4W < 2W (refer to chapter 5.2.3).
The decade switches automatically between R2W and R4W output terminals according to the resistance
value. Low resistance values are always available at the R4W terminals.
The over-switching value, from R4W to R2W terminals, is set at the SETUP menu (prameter 4 W < 2 W,
refer to chapter 5.2.3). The range of this point setting covers values from 0
Ω to 10
kΩ. It may be set with
a resolution of 1
Ω.
The resistance of preset 4W < 2W value is still available on the R4W terminals. When
4W < 2W value is set to 0
Ω, the R2W terminals are used as output only. The recommended 4W
< 2W
value is 2000
Ω.
Active terminals are indicated by a lighting LED at the rear panel.
The left terminal with symbol “GROUND” is connected to the housing.
Summary of Contents for 1427
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