Dranetz Xplorer Uživatelská příručka stáhnout pdf (Strana 127)

6-7

CH 6/ Advanced Setup Options

Procedure to

record transient

disturbance

(continued)

Continued on next page

Action... Result...

STEP 3 (continued):

• Enable toggles whether this

limit is enabled or disabled.

• Amps toggles between Volts

and Amps.

•Press Group A B C to set

identical waveform threshold

duration values for Channels A,

B and C.

•Press Next to set the rms

distortion waveshape limit.

Proceed to Step 4.

•Press Prev to return to the high

frequency transient screen.

•Press Cancel to retain previous

threshold duration and return to

Advanced Options menu.

NOTE: The figure above helps illustrate the

“floating window” algorithm used for waveshape

fault detection. This window is visualized on screen

as sliding along a waveform, precisely one cycle

behind the previous sample point, v

. The height of

the window defines a maximum allowable voltage

deviation in magnitude. The width of the duration

corresponds to a number of sample points, N. For

each sample v

, when compared to v

i-1 cycle

where

the deviation in magnitude is outside the maximum

allowable deviation, a counter is incremented. For

each sample v

that is within the maximum

allowable deviation, the counter, if greater than 0, is

decremented. If the count reaches N, a trigger

occurs.

STEP 4: PX5 allows users to set

rms distortion waveshape limit.

• Press the limit field to change

limit. Use the keypad to enter

the treshold limit beyond which

rms voltage variations occur.

• Enable toggles whether this

limit is enabled or disabled.

• Amps toggles between Volts

and Amps.

•Press Group A B C to set

identical rms threshold value

for Channels A, B and C.

•Press Next to set the transient

waveform capture pre- and

post-cycles setup. Proceed to

Step 5 on page 6-8.

MARK112_105

Present

Cycle

Previous Cycle

with Floating Window

Trigger

1 2 ... 122 123 124 125 126 127 128 129 130 131 132 ... 289 290

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