HT instruments PQA824 - Manual (Page 79)

PQA400 - PQA823 - PQA824
EN - 78
Column description:
N.: Progressive number of the transient.
L.: Phase in which the transient occurred.
Date/Time: Date/time at which the anomaly occurred.
Peak+:
Max. positive value reached by the transient during the observation interval.
Peak-: Min. negative value reached by the transient during the observation interval.
Delta+: Max. relative positive range reached by the transient during the
observation interval.
Delta-: Min. relative negative range reached by the transient during the
observation interval.
Type: Type of transient (Up/Down).
F/S: Transient speed (Fast if dV/dt >100V/5
s, Slow if dV/dt >100V/78s).
The following keys are active on this page:
 The up and down arrow keys move the cursor along the transients.
 The up and down arrow keys move the column display to the right or to the left.
 The
F1 key (or the PAG item on the display) advances to the following page of
transients (to be selected with the F3 or F4 key or through the items MOD (+) or
MOD (-) on the display).
 The
F2 key (or the PARAM item on the display) accesses the page showing the
settings for transients (Fig. 134).
 The ESC (or the smart icon ) to exit the function and go back to the
“Recording analysis” page (Fig. 125).
This page shows the parameters set before recording voltage transients:
Fig. 134: Fast transients parameters
The following values are indicated:
Limit: set voltage threshold.
This page also shows the total number of transients occurred (Events).
The following keys are active on this page:
 The up and down arrow keys move the cursor alternatively on Type, Phase or
F/S.
 The
F3 and F4 keys (or the MOD(+) and MOD(-) items on the display) enable
the user to filter the transients to be selected. It is possible to select All, Up,
Down (if the cursor highlights Type); All, Phase1, Phase2, Phase3, Neutral (if
the cursor highlights Phase); All, Fast, Slow (if the cursor highlights F/S).
 The ENTER key (or the smart icon on the display) confirms the selection
previously made and displays the table of voltage transients.
 The
ESC key (or the smart icon ) to exit the functions and go back to the “Fast
transients” page (Fig. 133).