User manual

[24]
c) Maximum Power Rating
The decade has a total maximum power rating of 3 Watt.
 The maximum power rating shall not be exceeded, as damage or even destruction of
the decade may occur.
 Limit applied voltage in relation to maximum activated resistor according to table 1.
 DO NOT APPLY ANY voltage to the decade without activated resistor !
 This may lead to immediate destruction of the decade and in combination with high
voltages even to personal injury !
The maximum operational voltage V
max
, which is allowed to be applied according to
maximum power rating of 3 W is calculated in the following way with the maximum
activated resistor R
on
:
V
max
= (3 W)² / R
on
Table 1 shows maximum operational voltage V
max
in relation to maximum activated
resistor R
on
at maximum power rating of 3 W:
R
on
V
max
I
Maximum activated resistor Maximum operational voltage Maximum resulting current
1 Ω 1,7 V 1,7 A
2 Ω 2,4 V 1,2 A
3 Ω 3 V 1 A
4 Ω 3,4 V 866 mA
10 Ω 5,4 V 547 mA
20 Ω 7,7 V 387 mA
30 Ω 9,4 V 316 mA
40 Ω 10,9 V 273 mA
100 Ω 17,3 V 173 mA
200 Ω 24,4 V 122 mA
300 Ω 30 V 100 mA
400 Ω 34,6 V < 100 mA
1 kΩ 54,7 V < 100 mA
2 kΩ 77,4 V < 100 mA