Knick P45000, User Manual

Page: 22 / 38

P45000
22
5.2.1 Single Operation
The restriction at U
HE
= ±24 V is only to be taken into account with ambient temperatures of
T
amb
= 75 … 85 °C (167 … 185 °F). At an ambient temperature of T
amb
< 75 °C (< 167 °F) the minimum
permissible load is R
M
= Ω, irrespective of the supply voltage and the input voltage.
A device is considered to be individually operated if the air gap to the side walls of other devices is
≥ 15 mm (0.59
″ ).
The following diagram represents the minimum load R
M,min
depending on the input voltage up to the
measuring range full scale and the supply voltage during single operation up to T
amb
= 85 °C (185 °F):
0
10
20
30
40
50
60
70
80
90
100
0 25 50 75 100 125 150
R
M
,m
in
[Ω
]
UHE = ±15 V UHE = ±24 V
U
HE
= ± 15 V U
HE
= ±24 V
Measuring range [%]
Without restriction
R restricted
M,min
Note: With a load of 100 Ω, the P45000 can be operated singly under maximum conditions for
temperature, supply voltage and input signal.
5.2.2 Side By Side Operation
Devices are considered to be operating side by side if the air gap between the side walls of the individ-
ual devices is < 15 mm (0.59
″ ). With side by side operation, the above conditions for single operation
apply plus the following restrictions:
The minimum permissible load with three devices operating side by side and a respective output cur-
rent of I
out
= 50 mA
rms
depends on the supply voltage and conditionally different maximum permissible
ambient temperatures.
The following table shows the maximum ambient temperature depending on the minimum load and
the supply voltage:
U
HE
[V] ±13.5 ±15 ±16.5 ±21.6 ±24 ±26.4
R
M
[Ω]
0
85 °C (185 °F) 85 °C (185 °F) 85 °C (185 °F) 75 °C (167 °F) 70 °C (158 °F) 65 °C (149 °F)
133
85 °C (185 °F) 85 °C (185 °F) 85 °C (185 °F) 80 °C (176 °F) 75 °C (167 °F) 75 °C (167 °F)
200 (only up to
50 mA) 85 °C (185 °F) 85 °C (185 °F) 85 °C (185 °F) 85 °C (185 °F) 80 °C (176 °F) 75 °C (167 °F)
Note: For applications with side by side devices and measured values within the nominal measuring
range, 200 Ω is optimal. For applications with side by side devices and measured values up to 1.5 times
the measuring range, 133 Ω is optimal.