PQube User Manual 2.1
Page 41 of 113
L-L voltage meters, L-N voltage meters: These are line-to-line, line-to-neutral, and neutral-
to-earth true-RMS voltmeters. Different meters will show on these screens, depending on
your power configuration. (For example, if the power configuration is “delta”, there will not
be any L-N meters, because there is no neutral conductor.) If you have set a potential
transformer ratio in your Setup.ini file, then these meters will use that ratio, so these
meters will sometimes show their values in kilovolts or even megavolts.
Frequency: This is a frequency meter. It is phase-locked to either L1-E or L2-E, depending
on which channel has the best signal. It measures frequency by timing the zero-crossings,
with a 5-pole analog low-pass filter and a 64-cycle digital low-pass filter.
AN/DIG1: The AN meters show the RMS voltage (equivalent to DC voltage for DC signals)
for the AN1 screw terminal to earth, AN2 screw terminal to earth, and AN1-to-AN2
differential voltage. The DIG1 meter shows the average value of the DIG1 digital input
screw terminal with respect to earth, averaged over one cycle – useful when the DIG1
signal is changing rapidly, because it will show the duty cycle of the DIG1 signal.
AN/DIG1 (AN_Energy_Mode only): With an ATT2 module, your PQube can monitor High
Voltage DC systems. After you have enabled the AN_Energy_Mode tag in your setup file,
AN1-E becomes AN
V
(DC voltage) and AN2-E becomes AN
A
(DC current).
A new screen also appears with DC Power and Energy. AN1-AN2 is replaced with
AN-Power, which is the product of the DC voltage and DC current channels. DC Energy is
also displayed here, and it can be reset from this screen.
Probe2 / Probe 1: These meters show the temperature and humidity of the two TH1
temperature-humidity probes. If one or both probes are not plugged in, the meters will
show “--“.
Current: These meters show the true-RMS current. They only appear if you have plugged in
an optional XCT4 current transformer interface module, or a CT4 current sensing module. If
you have set a current transformer ratio in your Setup.ini file, then these meters will use
that ratio, so these meters will sometimes show their values in kilo-amps or even mega-
amps. Different meters will show on this screen, depending on your power configuration.
(For example, if the power configuration is “delta”, this screen will not show a neutral
current meter, because there is no neutral conductor in delta power.)
Current: This screen is a continuation of the previous screen above. It shows the true-RMS
current on the earth conductor. You can choose in your Setup.ini file to calculate net
current from phase and neutral current; or you can measure it with a CT, either on the
earth conductor or with a net-current CT.
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