Measuring Circuit; Resistive Load - Hameg Instruments HM8115-2 Manual Del Usuario

Ω
R : V = 50 V ; I = 161 mA ; R = 311
rms rms
L
As the monitor output is 1 V and the full scale value is 8 W The
power equals 8 W. The HM 8115-2 displays:
V = 50 V
rms
I = 0,161 A
rms
P = 8,010 W
Example 3: Example 3: Example 3: Example 3: Example 3:
A resistor of 92 ohms and a capacitor of 10.6 uF are connected
in series to 50 V /50 Hz.
rms
2 2
Z = R + X with X
c
The impedance of the series circuit Z = 314 ohms so that the
levels are similar to those of the foregoing examples. The
picture shows the voltage across the load and the monitor
output.
The ranges selected are 50 V and 0.16 A, the full scale power
range is again 8 W which is equivalent to 1 V average at the
monitor output.
Ω
R : V = 50 V ; I = 161 mA ; R = 311
rms rms
L
TheHM8115-2 displays:
V = 50 V
rms
I = 0,161 A
rms
P = 2,416 W
100 V
50 V
GND
Voltage
at R
L
2 V
1 V
GND
Monitor
Signal
Q = 0,73 var
S = 8,038 VA
PF = 1,00
1 1
= — — — = — —
c ω · c
2πf · c
100 V
50 V
GND
Voltage
at R
L
2 V
1 V
GND
Monitor
Signal
Q = 7,67 var
S = 8,042 VA
PF = 0,30
O p e r a t i n g c o n t r o l s a n d d i s p l a y s
The frequency of the instantaneous power output
is twice the mains frequency of 50 Hz hence 100 Hz.
During one period of 50 Hz the maximum power
reaches twice its maximum, twice it will be zero.
HINT
Example 4:
A 311 ohm resistor is connected to a DC voltage of 50 V.
R : V = 50 V; I = 161 mA; R = 311Ω
L
INPUT /
OUTPUT
(4 mm safety connectors)
The measuring circuit of
the HM8115-2 is sepa-
rated from safety earth
PE! The two lefthand
connectors are labelled
INPUT and are connected
to the power supply. The
object under test will be
connected to the right-
hand connectors OUT-
PUT.
Please observe all relevant safety instructions if
voltages higher than the ones listed below are
applied to the INPUT terminals.
Keep DC voltages disconnected from ground. Isolate
AC voltages by inserting an isolation transformer.
Please note:
Voltages which exceed any of the following values
are considered dangerous:
st
1 30 Vrms;
nd
2 42.4 Vp;
rd
3 60 V DC.
Voltages higher than those values may only be
applied by qualified personnel who know the
applicable safety rules.
Disconnect the input voltage before unplugging the
safety connectors at the input terminals.
Disregarding this can lead to accidents, in the worst
case there may be danger of life!
If objects specified for safety class I are connected to
the OUTPUT terminals without an isolation trans-
former the safety earth must be separately
connected to the object under test, otherwise there
ist danger of life.
100 V
50 V
GND
Voltage
at R
L
2 V
1 V
GND
Monitor
Signal
12
13
14
35
Subject to change without notice