User manual

32 GMC-I Gossen-Metrawatt GmbH
7.11 Varying the Internal Output Resistance Value
Function
In the voltage regulating mode, internal output resistance has a
value of close to 0 Ω.
The internal output resistance value can be increased for certain
applications, for example simulation of long output cables or
weak automotive batteries. The selected (open-circuit) output
voltage is reduced in proportion to increasing load (figure 7.11 a)
Figure 7.11a Output Voltage with Reference to Load
Calculation
The following applies:
where ∞ ≥ Rext ≥ 0 Ω
where 0 Ω < Ri ≤ 1.11 Ω
Figure 7.11b Wiring for Varying Internal Resistance
R
i
20kΩ
18kΩ R
ext
+
-------------------------------
Ω×=
R
ext
20kΩ
R
i
--------------
Ω× 18kΩ–=
PSP-KONSTANTER
Einstellung
USET = Usoll
ISET = Isoll
OUTPUT ON
Analog Interface
TRG 1 + 1
TRG 1 - 2
TRG 2 + 3
TRG 2 - 4
SIG 1 + 5
SIG 1 - 6
SIG 2 + 7
SIG 2 - 8
SIG 3 + 9
AGND 2 10
+15V 11
AGND 1 12
Uext + 13
Uext - 14
Iext + 15
Iext - 16
U MON 17
I MON 18
SENSE + 19
SENSE - 20
+OUT
-OUT
Last
R
ext