Megger AVO 830, User Manual

Page: 19 / 48

www.megger.com AVO®830 and AVO®835 19
Measurements
AC+DC Description
The AC+DC function is used to measure complex voltages, which consist of both AC and DC components.
V
AC+DC
= √(V
AC
²
+ V
DC
²
)
Therefore
:
Where VAC = 230 V and VDC = 85 V
Addition of AC and DC voltages give 315 V.
However :
V
AC+DC
=
=
=
=
√ (V
AC
² + V
DC
²)
√ (230
²
+ 85
²
)
√ (60125)
245.20 V TRMS
Phase Rotation / Sequence Detection
Phase Rotation / Sequence Detection enables the connection of three phase power to the motor or any three
phase appliance in correct sequence.
Hz
CAT III 1000V
CAT IV 600V
COM
FUSED
100mA
V 10A
Ω
AVO835
RANGE
MODE
MIN MAX
AVG
REL %
REL
Low Z
HOLD/Auto
ac+dc
APO
Lo
Hz
Hz
°F
Hz
V
Hi
A
mA
OFF
OFF
Ω
°C
Hz
CAT III 1000V
CAT IV 600V
COM
FUSED
100mA
V 10A
Ω
AVO835
RANGE
MODE
MIN MAX
AVG
REL %
REL
Low Z
HOLD/Auto
ac+dc
APO
Lo
Hz
Hz
°F
Hz
V
Hi
A
mA
OFF
OFF
Ω °C
Hz
CAT III 1000V
CAT IV 600V
COM
FUSED
100mA
V 10A
Ω
AVO835
RANGE
MODE
MIN MAX
AVG
REL %
REL
Low Z
HOLD/Auto
ac+dc
APO
Lo
Hz
Hz
°F
Hz
V
Hi
A
mA
OFF
OFF
Ω
°C
V V
1. 2.
2
1
3
2
1 3
Fig 2: Phase Rotation / Sequence Detection Set-up
For a valid detection, set the voltage level and supply frequency to:
„
ACV: > 80 V
„
Supply Frequency: In the range 40 Hz to 80 Hz.