Gossen MetraWatt METRAHIT ENERGY TRMS System Multimeter Operating Instructions Manual page 95

Abbreviation Meaning
(Sub) Menu
Parameter
StorE Main memory for
memory mode
operation
SWELL Overvoltage
SWELL LiMit Overvoltage limit value See SWELL
t /t Duty cycle
E P
THD Total harmonic
distortion
trAnS Transients
trAnS LiMit Transients limit value
t.StorE Recording time
U.rAnGE Voltage range of the
harmonics
GMC-I Messtechnik GmbH
General Description
Description Specifically for this Instrument
Parameters: HYSt, rAtE, Sto-ou, Sto-in, L_triG, H_triG, t.StorE
Power and energy measurement in memory mode:
Scope of stored values for power and energy measurements:
Mains disturbance recording in memory mode:
If the TRMS half-wave value exceeds the specified limit, a brief overvoltage (swell) is detected.
Parameter: SWELL LiMit
The ratio of pulse duration to pulse period is measured with periodic square-wave signals and is
displayed as a percentage.
Pulse duration (t
Duty cycle (%) =
Pulse period (t
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.
Steep sloped voltage peaks; parameter: trAnS LiMit
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.
Limiting of recording duration (hh:min:ss) to a maximum of 99 hours, 59 minutes and 59
seconds, or unlimited recording time: parameter = on.
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!
section 4.5.2
section 6.4.4
section 5.1.4
)
E  100
)
P
Glossary
Application Switch
Chapter / Page Position /
Menu
Memory mode All
operation StorE menu
section 4.5
Power disturbance PQ
analysis SEt menu >
section 5.1.3 MainS
Duty cycle %
measurement
section 5.1.6
Harmonic analysis (vol- , A
tage)
section 5.1.5
Harmonic analysis
(current)
section 5.8.2 and
section 5.8.3
Power disturbance PQ
analysis SEt menu >
section 5.1.3 MainS
Memory mode All
operation StorE menu
section 4.5
Harmonic analysis
section 5.1.5 SEt menu >
HArM
95