38
GMC-I Gossen-Metrawatt GmbH
20
Power Measurement with the METRA HIT 29S
20.1
Power Measurement with Analog Signals I and V
The METRA HIT 29S is a compact power meter for direct
and alternating current for single phase power measure-
ment. The current path can be measured directly (up to
10 A) or with the help of a (clip-on) current transformer.
Universal power measurement includes the following mea-
surement functions: active, reactive and apparent power,
power factor, energy, mean and maximum power values.
➭
Select power measurement with analog signals in the
EnErGY menu by setting the following parameters:
unit of measure W, VA or VAr for mean and maximum
values as well as the corresponding integral-action time
(see chapter 20.3).
➭
Set the rotary switch to “W/mA” (max. 300 mA)
or “W/A” (max. 10 A), see page 70.
➭
Briefly press the
ESC|FUNC
key.
Measurement is switched from A DC to A DC and AC.
➭
Press the
ESC|FUNC
key a second time to start active
power measurement.
Each additional activation of the
ESC|FUNC
key causes
switching to the various display functions for active power
W
, apparent power
VA
, reactive power
VAr
, energy
Wh,
mean
value
MEAn W
and maximum power values
MAX VA
and
W
.
➭
Connect current and voltage paths as shown below.
Connect either the mA or the A output, depending upon
the previously selected switch position. See Chapter
20.5, page 42 for use with
current transformers
.
The instrument automatically selects the measuring range
which provides maximum resolution for the current mea-
sured quantity.
Significance of Power Factor Display
±
1: no phase displacement
–(0 ... 0.99): capacitive
+(0 ... 0.99): inductive
600V
V
F
°
C
–/N
+/L
…
10 A
~
(
…
300 mA)
Consumer
A
mA
10A
300mA