User manual

Observe that only the sensor at the tip of the wire temperature sensor is
designed for resisting high tempters. Never subject the multimeter or measuring
lines to any high temperatures! While you can usually read electrical values
directly, temperature measurement takes some time. Since the temperature sensors
comprise different materials, they have to heat to he temperature to be measured
first. Therefore, touch the temperature sensor to or hold it into the medium to
be measured until the display has stabilised. This usually take about 30 seconds.
Figure 77: Once you have set the temperature measuring range at the multimeter,
you may measure the ambience temperature.
Figure 78: For temperature measurement, a so-called NiCrNi(nickel-chrome-nickel
type K) sensor is used. It is designed for temperatures of up to +400 °C.
Figure 79: The black string is connected to the instruments COM socket. The red
one is connected to the
Ωsocket.
Figure 80: The air temperature close to a halogen spotlight is determined here.
Only the measuring prod of the wire temperature sensor must be subject to high
temperatures.
Annex: Power and Work
Indirectly, the multimeter can also be used to calculate power intake and the
work performed by the electrical energy in it. For this, determine power intake
first. This requires a current and voltage measurement at the circuit. The total
current I
ges
and total voltage U
ges
must be measured in each case.
Use the formula: P = U * I
P ... electrical power in watt (W)
U ... Voltage in volt (V)
I ... Current in ampere (A)
to calculate power intake of the circuit. If you also want to know how high the
electricity consumption is, e.g. within one hour, you need to multiply the
previously determined power by 3,600 seconds.
The formula: W = P * T
W ... electrical power in watt seconds (Ws)
P ... electrical power in watt (W)
T ... Time in seconds (s)
Our current meters work according to the same principle, by the way. While you
are working with the small unit of watt seconds here, however, the current meter
usually uses kilowatt hours (kWh).
Figure 81: To determine power intake and the electrical work performed, first
determined only the overall voltage U
ges
...