5-3 5-4
MODE P
MODE I
MODE U
BURST I
BURST U
FLICKER
Select MODE P if you want complete signal information in your test circuit and if you have both
current and voltage applied to the Spectral Multimeter. This very unique measuring mode can be
used when the fundamental frequency of the applied current is in the range 20Hz to 1kHz. The
SM201 determines all available quantities on current (also IEC555-2) and voltage including
harmonics, impedance, and phase angle between current and voltage of every harmonic. A novel
measuring technique allows the computation of active-, apparent-, and reactive power, power
factor, harmonics of power, and energies (active, apparent, reactive).
Select MODE I if you want signal information on current only. All available quantities pertaining
to current including harmonics and charge (integration of rectified mean current) are available.
Select MODE U if you want signal information on voltage only. All available quantities
pertaining to voltage are determined.
Select BURST I or BURST U if you want to measure the rms-value of a current burst or a voltage
burst. A typical application could be the measurement of a current burst in a welding process. A
minimal burst duration of 1ms is acceptable. At all times you must use manual ranging and you
must select a suitable range. For more information on various measurements refer to the end of
section 5 of this manual. By selecting B_dur from the display selection table the duration of a
burst is displayed (1ms up to 10s).
Select FLICKER if you want to run a precompliance test on your equipment regarding flicker
according to IEC555-3 / IEC1000-3-3 / EN61000-3-3.
The SM201 complies with the IEC report 868 to determine short time flicker PST and long time
Flicker PLT. PST is determined in 10 minute intervals and its value is displayed if you have selected
PST and PLT as one of the display values. PLT is updated every 10 minutes and can run as long as
5300 hours. Always use 0.5 sec measuring time for flicker measurements.
For a quick flicker result you can select PS1 (1 minute) or PS3 (3 minutes) flicker quantities. Only
one short time flicker value must be displayed at a time. Long time flicker is update when a new
short time flicker value is available (1 minute, 3 minutes, or 10 minutes).
Prior to a flicker measurement we recommend to reset PST and PLT to zero. This reset function is
combined with the energy reset. Therefore, you should display an energy value in a number field.
To RESET FLICKER (and energy) move the cursor to the energy value and press the RESET-
key to set PST and PLT to zero.
5.6. SELECTING THE MEASUREMENT TIME
The measurement time sets the minimum time for signal averaging as well as the time for display
update. It can be varied from 100ms, 250ms, 500ms, 1s, 2s, 5s, and IEC555-2. For frequencies
below 10Hz use 1s measurement time.Furthermore, this averaging time is expanded to the end of
the next signal period. This results in stable readings down to 2Hz. To select the measurement
time move the cursor to the measurement time annunciator and press the SET-key.
The pull-down menu gives you seven choices. Select the one you need by moving the cursor to
the desired position. Press the SET-key to select the desired measurement time.
Selecting the measurement time IEC555-2 (measuring Mode I) current harmonics are determined
according to IEC1000-3-2 / EN61000-3-2. Current harmonics are calculated from an FFT over 16
periods.
5.7. SELECTION OF AC- OR DC+AC-COUPLING
Coupling pertains to some, not all, measured quantities. AC-coupling is possible for the rms
values, for active-, apparent-, and reactive power, and for power factor.
Move the cursor to the quantity you want to change the coupling, e.g. rms current. The menu at
the bottom of the display shows AC/DC and an annunciator DC+AC or AC on the left side of the
display indicates the presently set coupling for the selected measurement value. The second menu
key M2 toggles the coupling from DC+AC to AC and vise versa.
Selecting AC means that this measurement value is without a possible dc-component and DC+AC
coupling means it is including the dc-component.
5.8. CHANGING THE DISPLAY CONFIGURATION
You have the choice of selecting 8 current values: rms, mean, rectified mean, crest factor,
minimum, maximum, peak-to-peak, and form factor. 8 values four voltage, four power related
quantities, frequency, three energies, charge, and harmonics of current , voltage, and power.
Any one of these measured values you can place at any location on the display. We recommend to
place the most important quantities at the top of the display.
This is how you modify the display, at one place, for example, the quantity at the bottom of the
first column.
Move the cursor to this location and press the SET-key. A table appears in which you can select
the quantity of your choice by moving the cursor to this position in the table. Press the SET-key to
place the new quantity on the display.
