User Manual

GMC-I Messtechnik GmbH 94
Glossary
StorE Main memory for
memory mode
operation
Parameters: HYSt, rAtE, Sto-ou, Sto-in, L_triG, H_triG, t.StorE
Power and energy measurement in memory mode: section 4.5.2
Scope of stored values for power and energy measurements: section 6.4.4
Mains disturbance recording in memory mode: section 5.1.4
Memory mode
operation
section 4.5
All
StorE menu
SWELL Overvoltage If the TRMS half-wave value exceeds the specified limit, a brief overvoltage (swell) is detected.
Parameter: SWELL LiMit
Power disturbance
analysis
section 5.1.3
PQ
SEt menu >
MainS
SWELL LiMit Overvoltage limit value See SWELL
t
E
/t
P
Duty cycle The ratio of pulse duration to pulse period is measured with periodic square-wave signals and is
displayed as a percentage.
Duty cycle
measurement
section 5.1.6
%
THD Total harmonic
distortion
As a standard feature during harmonic analysis, THD is displayed in accordance with the
equation: “THD = total TRMS value of harmonics ÷ TRMS value of the fundamental frequency”.
As opposed to this, harmonic distortion of the individual harmonics appears in the displays for the
individual harmonics.
“Distortion component = TRMS value of the harmonic ÷ TRMS value of the fundamental
frequency.
Harmonic analysis (vol-
tage)
section 5.1.5
Harmonic analysis
(current)
section 5.8.2 and
section 5.8.3
, A
trAnS Transients Steep sloped voltage peaks; parameter: trAnS LiMit Power disturbance
analysis
section 5.1.3
PQ
SEt menu >
MainS
trAnS LiMit Transients limit value A level can be set here as of which a voltage transient is recorded. This is a polarity independent
entry relative to the momentary value. The smallest value is 200 V. Regardless of the selected
measuring range, acquisition always takes place within a range of 200 … 1000 V.
t.StorE Recording time Limiting of recording duration (hh:min:ss) to a maximum of 99 hours, 59 minutes and 59
seconds, or unlimited recording time: parameter = on.
Memory mode
operation
section 4.5
All
StorE menu
U.rAnGE Voltage range of the
harmonics
See HArM
Voltage range of the harmonics (here: auto, 600 mV, 6 V, 60 V, 600 V)
Note: Clamp factor is not taken into consideration!
Harmonic analysis
section 5.1.5 SEt menu >
HArM
Abbreviation
(Sub) Menu
Parameter
Meaning General Description
Description Specifically for this Instrument
Application
Chapter / Page
Switch
Position /
Menu
Duty cycle (%) =
Pulse duration (t
E
)
Pulse period (t
P
)
• 100