16-1
IM WT1801-01EN
16 High Speed Data Capturing
High Speed Data Capturing (OTHERS(High Speed Data
Capturing))
Models with the high speed data capturing option can measure every 5 ms and save the measured data to a file.
Also, you can synchronize the WT1800 with another device during measurement by applying an external sync
signal to the external start signal I/O (MEAS START) connector.
High speed data capturing takes advantage of the fact that in a balanced three-phase circuit, the instantaneous
values of the three phases of the rms voltage (UrmsΣ), the rms current (IrmsΣ), and the power (PΣ) add up
to a direct current. For a three-phase, three-wire system or three-phase, four-wire system, the WT1800 can
measure the rms voltage (UrmsΣ), the rms current (IrmsΣ), and the power (PΣ) at a high response speed. In an
unbalanced three-phase circuit, the measured values fluctuate. This indicates that the power consumed by the
load varies instantaneously.
When the measured values fluctuate, you can stabilize the measured voltage (U), current (I), and power (P)
values for each element and the measured UmeanΣ, ImeanΣ, Ur-meanΣ, and Ir-meanΣ values for each wiring
unit by setting a low cutoff frequency for the HS filter. However, if you set a low cutoff frequency for the HS filter,
the response to changes in the measured values becomes slower.
Display Indications for High Speed Data Capturing
High Speed Data Capturing State
File Recording State
High Speed Data Capturing State
• Ready
• “Ready” appears when high speed data capturing has been reset and the WT1800 is ready to begin high
speed data capturing.
• When the number of data captures has been set to a value other than Infinite, the number of data captures
appears to the right of Count.
Ready
Number of data captures
• Start
• “Start” appears when high speed data capturing has been started.
• The number of data captures that have been performed appears to the right of “Captured.”
Number of times data has been captured
Start
• Init(Initialize)
• “Init” appears when high speed data capturing is being initialized.
• A bar appears that indicates the initialization progress.
• The time remaining for the initialization appears to the right of “Remaining.”
Initialization progress
Remaining initialization time
Init
