User manual

36
Analysis
For each corresponding equation, the input channels CH1,
CH2, CH3, CH4 and an adjustable constant are allowed as
OPERAND (sources). For the formula MA2, MA1 is added
as source, for MA3 the added source is MA2, for MA4 it is
MA3andnallyforMA5theaddedsource is MA4. From
theseveequations,youcancreate,saveandretrievea
totalofvedifferentsets.Newequationscanbeaddedby
using the universal knob to select the menu item NEW in
the formula set editor. Pressing the soft menu key ADD al-
lows you to edit the new equation.
Use the soft menu key EDIT CONSTANT and the universal
knob in the CURSOR/MENU section to choose from the
following constants:
❙ Pi
❙ 2x Pi
❙ 0,5 x Pi
❙ User 1 to 10 (up to 10 customized constants are available)
For instance, if you select USER1 as constant, you can
press the soft menu key VALUE and use the universal knob
in the CURSOR/MENU section to select a numeric value.
You can apply the same method to set a DECIMAL POINT
andenteranadditionalSIprex(softmenukeyPREFIX).
YoumaychooseaUNITfromthesameSIprexesas
those that are available in the soft menu EDIT. Press SAVE
to store these settings as USER 1 and return to the menu
to edit the equation. You can store up to 10 of these custo-
mized constants. When saving a formula set, you may also
add a comment (soft menu key COMMENT). Press the key
SAVE to save this formula set with the determined name
and comment to the selected location. Stored formula sets
may be reloaded at any time. Press the MATH key to acti-
vate the Mathematics menu and then press the MENU key
below the VOLTS/DIV key. This menu displays the menu
itemLOAD.Thiswillstartthelemanagerwhichwilldis-
play the internal memory or the connected USB stick as
possible storage location. Select the respective formula set
leandpressthekeyLOADtoloadthele.Itwillbecalcu-
lated, but will not be included in the display. You can also
choose a NAME with a maximum of 8 characters, load a
formula set (from the internal memory or from a USB stick)
or save a formula set (internally or on a USB stick). You can
Fig. 9.4: Entry of constants and units
use the universal knob to enter the name of your choice
and you can save it by using the ACCEPT key. The name
will now be displayed Instead of the generic labels MA1 to
MA5. You can specify the names for all equations separa-
tely. Once all equations, constants and names have been
entered, you may also choose a name for this formula set
by pressing the NAME key in the formula set menu and
entering the name of your choice.
9.1.3 Example for using the extended math
This example shows the analysis of an electrical energy
waveform. The voltage across the load is being measured
with differential probe and applied to channel 2. The cur-
rent is being measured with a current probe and applied to
channel 1. First, the conversion factor of the current probe
(100 mV/A) will be entered. The formula set 1 will be ope-
nedandtheequationMA1willbedened.Afterpushing
the soft menu key EDIT, the appropriate functions can be
selected using the universal knob in the CURSOR/MENU
section. In this example, channel CH1 will be multiplied
with a constant (0.1) and the unit A (Ampere) will be assi-
gned. This ensures the correct display of the scale factors
as well as the units for cursors and automatic measure-
ments. The equation MA1 can be named „CURRENT using
the soft menu key LABEL.
Fig.9.5:Denitionofthecurrentequation
Fig.9.6:Denitionofthepowerequation