Amprobe DMIII-Multitest Power-Quality-Recorder - Manual (Page 56)

AMPROBE
DMIII MULTITEST
EN-54
7.5.3. “HARM" mode
By selecting the HARM mode one of the screens below will be displayed according to the
settings made. The screens show the harmonics of the phase currents.
Example of screen in
single-phase mode
Example of screen in “3-
wire” or “4-wire” three-
phase mode
The symbols used are described in Tab. 2.
For eventual messages displayed see appendix 1
– MESSAGES DISPLAYED.
The displayed histograms represent the harmonic content of the current under test. The
value of the first harmonic h01 (primary at 50Hz) is not represented in scale along with the
other harmonics in order to maximise the display of the latter. In case both voltage and
current are connected to the instrument inputs, eventual negative values (therefore
represented under the horizontal axis), indicate that such current harmonics are
“generated” by the load.
Following keys are active:
 F3, F4:
to move the cursor of the selected harmonic leftwards and rightwards
respectively. At the same time the values related to the order no. of
the selected harmonic and to the corresponding absolute and relative
values (calculated on the basis of the fundamental) are updated
 F1
(only for three-phase mode): to display the values of the harmonics of
the other voltages available. The voltage displayed is indicated above
the F3 key
 F2:
to display the page of the harmonics h01

h24 (h24 symbol) or the
page of the harmonics h25

h49 (h49 symbol)
 ESC:
to return back to METER mode (see paragraph 7.5.2)
 SAVE: to store in the instrument memory a record of “Smp” type and the
instantaneous values of voltage and current present at the instrument
inputs. This function is disabled during a recording
 ENTER/HOLD: to enable/disable the HOLD function (updating interruption) of
displayed data. All previous functions remain however available. When
the HOLD function is activated, the word
HOLD is displayed. When
27.09.00 17:35:12
I1 = 230.2 A
h03 = 10.2 A
h03 = 4.3 %
ThdI = 11.0 %
h49  
27.09.00 17:35:12
I1 = 230.2 A
h03 = 10.2 A
h03 = 4.3 %
ThdI = 11.0 %
ChgP h49  