Ametek California Instruments MX15 Series User Manual page 76

ENTRY
V OLT THD
PHA SE
Update Program Functions from Measurement Screen
The Shuttle knob can be used to update voltage and/or frequency settings while the
measurement readout screen is displayed. To do so, select the desired parameter to be
changed while in the SET screen using the left arrow cursor. Then, select the measurement
screen by pressing the MEAS button. While the measurement screen is visible, the shuttle
continues to operate.
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measurement will continuously track the maximum current value detected until reset.
See also PEA K CURRENT in M EA SUREM ENTS 2 screen.
This readout displays the total voltage distortion for the selected phase. The distortion
calculation is based on the H2 through H50 with the RM S voltage in the denominator.
Note that some definitions of THD use the fundamental component (H1) of the voltage as
the denominator.
If desired, the user can program the power source controller to use the fundamental
component as the denominator. This mode can only be programmed over the bus by
sending the "M EA S:THD:M ODE FUND" command. A t power up or after a reset command,
the mode will revert back to RM S.
Relative voltage phase angle measurement with respect to phase A . This readout is only
relevant if an external clock source is used.
DESCRIPTION