18
Figure 4.8.2
Electrical diagram of the connection of 00.16131.501040 to a typical voltmeter or data-
logger with the capability to measure voltage signals.
4.9 Data acquisition requirements for using 00.16131.501000’s millivolt output
The selection and programming of data loggers is the responsibility of the user. The LAMBRECHT
meteo data logger Ser[LOG] Plus is ideally suited for solar irradiance measurement using a
pyranometer with millivolt output.
00.16131.501000 can usually be treated in the same way as other thermopile pyranometers.
Table 4.9.1
Requirements for data acquisition and amplification equipment for 00.16131.501000 in the
standard configuration
Capability to measure small voltage
signals
preferably: 5 x 10
-6
V uncertainty
minimum requirement: 20 x 10
-6
V uncertainty
(valid for the entire expected temperature range of the acquisition /
amplification equipment)
Capability for the data logger or the
software
to store data, and to perform division by the sensitivity to calculate the
solar irradiance.
E = U/S
Data acquisition input resistance
> 1 x 10
6
Ω
Open circuit detection
(WARNING)
open-circuit detection should not be used, unless this is done
separately from the normal measurement by more than 5 times the
sensor response time and with a small current only. Thermopile
sensors are sensitive to the current that is used during open circuit
detection. The current will generate heat, which is measured and will
appear as an offset.
00.16131.501040
brown [+]
blue 4 to 20 mA output
V
ground
power supply 5 to 30 VDC
v oltmeter
I = 4 to 20 mA
shield
R
I = U / R
