XT2640 Operating Manual
13 July 2016
Page 50 of 187
This screen shows the mean Volts, mean Amps, total Watts, total VA, total VAR, total PF and Frequency measurements for the
selected VPA.
The primary measurement results are shown using a large font and colored yellow‐gold.
CAUTION: If V and/or A signals have RMS values which are beyond the measurement capability of the channel then the
respective primary data is colored red. You should ensure that the signals are within the capabilities of the channel and
should reduce the signal levels as soon as possible otherwise the channel may be damaged.
The primary Watts, VA, VAR and PF data is the total data for the VPA.
The primary Volts and Amps data is the average for all phases/channels in the VPA.
Whether the current is leading or lagging the voltage can be determined by the direction of an arrow shown immediately after any
PF data shown. If the arrow is pointing upwards then the current is leading, if downwards then it is lagging.
The Watts, VA, VAR, PF, Volts and Amps results are grouped with their respective secondary results.
The secondary results are shown in a smaller font and are colored white and these may be disabled or enabled by pressing
the DETAILED/BASIC Button.
For all data the secondary results show the individual channel results for each channel in the VPA.
For 3ø3w(2ch) and 3ø3w(3ch) WIRING settings the secondary voltages are the phase‐to‐phase voltages and the primary
voltage is the average of the three phase‐to‐phase voltages.
For 3ø3w(2ch) and 3ø3w(3ch) WIRING settings the Wye voltage conversion is also shown.
For 3ø4w WIRING setting the Delta voltage conversion is also shown.
Whether the current is leading or lagging the voltage can be determined by the direction of an arrow shown immediately
after any PF data shown. If the arrow is pointing upwards then the current is leading, if downwards then it is lagging.
The PHS data in the PF group secondary data is the inverse cosine of the PF data with the polarity set from the lead/lag
determination.
The frequency shown (if any) is the fundamental frequency obtained for this channel, from the source configured by the FUND
setting in the MEAS CONFIG screen for this channel.
If MEASURING is shown for frequency with no other measurement results, then this indicates that the first measurement is
being made with a new configuration. This is temporary (unless measurements are held); as soon as the first measurement
results are available they will be shown.
If NO FUNDAMENTAL is shown for frequency, then this indicates that the signal providing the fundamental frequency
measurement (the FUND setting in the MEAS CONFIG screen for this channel) is either not present or has not been
measured yet following a change to the measurement configuration.
If configured for LF or VLF measurements (by the LF/PERIOD setting in the MEAS CONFIG screen for this channel) then a
measurement progress bar is included in the lower right corner of the data window.
12.5.2.2
INRUSH
DATA
This is viewed by selecting the INRUSH selection in the Data Select Button.
This screen shows the highest total ACDC Watts, highest phase ACDC Volts, highest phase Peak Volts (largest excursion from zero),
highest phase ACDC Amps, and the highest phase Peak Amps (largest excursion from zero) for the selected VPA. The data shown on
this screen is reset by pressing the CLEAR button.
Note:
The measurements obtained for inrush are not affected by the RESPONSE setting for the VPA.
