User Manual

ManualsBrandsGossen Metrawatt ManualsDigital Multimeters - HandheldDigital Multimeter, 600V, 300kHz, 60MOhm

36 GMC-I Messtechnik GmbH

Measurements: V/Hz/dB – PQ/ – MHz/% – Ω/nS/R

– /

–

Temp – /m – W/Wh – A/Hz/thd

5.1.5 Harmonic Analysis (voltage measurement)

In the switch positions for the mains quality analysis and cur-

rent measurement (A) functions, harmonic analysis is performed

approximately once per second using 32 averaged sampling

values per mains period (adjustable to 16.7, 50, 60 or 400 Hz, see

section 6.4.6 on page 71).

FFT (fast Fourier transformation) makes oscillations up to the 15

harmonic available to this end. The RMS values of the fundamental

harmonic (HD 1) and the individual higher harmonics (HD 2

through 15), as well as total harmonic distortion (THD) are calcula-

ted. RMS values and harmonic components are displayed in each

case (RMS values relative to the RMS value of the fundamental

harmonic). Harmonic analysis is also available for current clamp

measurement.

Ð Set the rotary switch to PQ.

Ð Press the multifunction key FUNC | ENTER.

Ð Connect the measurement cables as you would for a voltage

measurement.

The main display shows total harmonic distortion as a percentage,

and the total RMS value of distortion appears at the right-hand

auxiliary display.

Ð The distortion components (main display) and the RMS values

of the individual harmonics (left-hand auxiliary display) can be

measured by pressing the





scroll keys.

Ð The instrument is switched directly to a display of total har-

monic distortion after pressing the ZERO | ESC key.

Prerequisites

The results of harmonic analysis are only valid if the following

conditions are fulfilled:

• The fundamental frequency corresponds with the selected

fundamental frequency.

• Only significant harmonic components occur up to the 15

har-

monic (made apparent by rapidly dropping RMS value compo-

nents up to the 15

harmonic).

• The AC TRMS value amounts to at least 5% of the measuring

range.

Additional Harmonic Analyses (current measurement)

For direct current measurement see section 5.8.1, for measure-

ment with current clamp sensor see section 5.8.2 and for measu-

rement with current clamp transformer see section 5.8.3.