Arbiter Systems 931A, Operation Manual

Page: 57 / 161

left arrow keys. Finally, use the up and down arrow keys to change the
numerical digit, or decimal point, and press ENTER. After the changing
the PT and CT values, move the cursor to PT/CT ON, and press ENTER.
When done, this applies the new scale factors for PT and CT to every
input, and blocks out the individual scale factors shown for Vxy and Ix.
Phase angle scale factors indicate the offset, in degrees, that will be
added to the input signal before it is displayed. Additionally, these offsets
apply only at the fundamental frequency of the signal. In the harmonic
display mode, phase offsets equal the offset at the fundamental frequency
multiplied by the chosen harmonic number.
Enable or disable individual scale corrections globally using the SCALE
menu (see Scale Factor Screen above), bottom line.
Measurements made in wide-band mode use digital true-rms detection.
Phase corrections are applied for power quantities by using complex
multiplication. The accuracy of this method depends on the absence of
significant harmonic power and the size of the phase offset.
3.3.3 Data Entry Functions
When performing operations, which require modification of parameters
or making selections from menus, the arrow keys in the top row of the
keyboard are used for cursor movement as described in the following
paragraphs.
The general procedure for selecting items from a menu is to use the
arrow keys to move the cursor (arrow symbol) to the desired selection and
press the ENTER key. If the menu selection was a number to be modified,
the cursor (flashing underline) will appear under the digit to be modified.
Use the right/left arrow keys to select the digit to be modified. Use the
up/down arrow keys to cycle the digit (+, ,., 0, 1, 2, 3, 4, 5, 6, 7, 8, 9).
Press ENTER when the number is correct. The plus, minus and decimal
point will only be included in the cycle where appropriate.
3.3.3.1 Nomenclature
Setup 2
PHASE
FREQUENCY
Setup 3
POWER
VARS
Setup 4
VA
PF
Setup 5
HARMONICS
Setup 6
WAVEFORM
ENTER
Setup 1
VOLTS
AMPS
ESCAPE
41