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R :
V = 50 V ; I = 161 mA ; R = 311
Ω
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:
A resistor of 92 ohms and a capacitor of 10.6 uF are connected
in series to 50 V
/50 Hz.
rms
with X
Z =
R
2
– X
2
c
c
The impedance of the series circuit Z = 314 ohms so that the
levels are similar to those of the foregoing examples. The pic-
ture 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.
R :
V = 50 V ; I = 161 mA ; R = 311
Ω
L
rms
rms
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
= ———– = —– —
2πf · c
ω · 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.
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 /
12
OUTPUT
14
(4 mm safety connectors)
The measuring circuit of
the HM8115-2 is separa-
ted from safety earth PE!
The two lefthand connec-
tors are labelled INPUT
and are connected to the
power supply. The object
under test will be con-
nected to the right-hand
connectors OUTPUT.
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. Iso-
late AC voltages by inserting an isolation transfor-
mer.
Please note:
Voltages which exceed any of the following values
are considered dangerous:
1
st
30 V
;
rms
2
nd
42.4 V
;
p
3
rd
60 V
.
DC
Voltages higher than those values may only be
applied by qualified personnel who know the appli-
cable safety rules.
Disconnect the input voltage before unplugging the
safety connectors at the input terminals. Disregar-
ding 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
transformer 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
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