This function allows you to calculate individual phase voltages from the line voltage measured in a threephase, three-wire (3V3A) system. R-S line voltage can be calculated in systems measured from a three-phase, three-wire method (using two elements). This is useful when you want to determine the phase voltage in motors and other items under test with no neutral lines. Line to line voltage and phase current (measurements equivalent to 3V3A) can be estimated in systems not measured from a three-phase, three-wire configuration (using two elements).

In addition to the standard two channels of frequency measurement, a six-channel frequency measurement option is also available. This option provides frequency measurement of voltage and current on all eight channels (with input elements 1 through 4 installed). This is necessary when you want to measure voltage and current frequency from the instrument’s I/O as well as voltage and current frequencies of multiple items under test at the same time.

• 20 channels
  Measured valuescan be output as ±5V 5V FS DC voltages from the D/A output connector on the rear panel. Measured parameters can be output on up to twenty channels simultaneously. Even with four input elements installed, you can send up to five types of data per element to D/A output.
• D/A zoom
  Normally the D/A output function outputs DC voltage scaled to a range of -5V to 5V* with respect to the measurement range. For this reason, it may not be possible to observe fluctuations in a nearly constant signal if the D/A output is set to go to ±5V at the measurement range rated value. One case in which this could happen is when a 100V measurement voltage fluctuates in the range of ±3V.
  The WT3000 has a D/A zoom function to solve such problems. This function allows the any input signal range to be scaled to between -5V and 5V* in the D/A output as Upper and Lower ranges. This makes it possible to enlarge input signal fluctuations for observation using a recorder or logger.
  

* The range is 0V to 5V for some functions, such as frequency measurement.

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