Hameg Instruments HM8115-2 Manual De Instrucciones página 35

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:
A resistor of 92 ohms and a capacitor of 10.6 uF are connected
in series to 50 V /50 Hz.
rms
mit X
2 2 c
Z = R – X
The impedance of the series circuit Z = 314 ohms so that the le-
vels 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
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
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 re-
HINT
aches twice its maximum, twice it will be zero.
Example 4:
L
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 connec-
tors)
The measuring circuit of
the HM8115-2 is sepa-ra-
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 ap-
plied 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
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2 nd 42.4 V
3 rd 60 V
Voltages higher than those values may only be
applied by qualifi ed 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 specifi ed 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.
12 13
;
rms
;
p
.
DC
Subject to change without notice
100 V
50 V
GND
Voltage
at R
L
2 V
1 V
GND
Monitor
Signal
14
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