PQube User Manual 2.1
Page 47 of 113
is “PQube” and you wanted to monitor the 7
th
harmonic, then you would send your PQube an
email with subject “PQube Set Harmonic Order of Interest to 7” to set your Harmonic of Interest.
Modbus
Register 166 is now writable; simply write your desired Harmonic of Interest (as integer).
Flicker
In Firmware 2.0, your PQube calculates Incandescent Flicker using methods based on IEC 61000-4-
15. Flicker has three components: P
inst
, P
ST
, and P
LT.
P
inst
is instantaneous flicker. P
ST
is the short
term flicker over 10 minutes, synchronized to real-time clock. P
LT
is the aggregate value of twelve
consecutive P
ST
measurements over 2 hours, synchronized to a real-time clock. Choose between
120V/60Hz or 230V/50Hz lamp voltage by editing the Flicker_Lamp_Voltage tag in the
[Measurement_Setup] section of your Setup file.
Auxiliary Analog Measurements
Your PQube has two auxiliary analog input screw terminals labeled AN1 and AN2. These channels
operate in either HIGH range or LOW range. In HIGH range, you can monitor signals up to ±100V
with respect to your PQube’s Earth terminal. For smaller signals, you can use LOW range to
monitor signals up to ±10V with respect to your PQube’s Earth terminal.
Use these terminals to monitor anything with a voltage output. One common use for these screw
terminals is to monitor a -48VDC system, or to monitor a 24VAC or 24VDC system. For example,
you might connect these AN monitoring terminals to your PQube’s POWER terminals.
Your PQube can monitor the voltages between each of these terminals and the earth connection
(AN1-E and AN2-E), and/or the voltage between these two terminals (AN1-AN2). If using an ATT2
module for measuring DC voltage and DC current, you can also monitor the product of the two
channels (AN1xAN2) to calculate your power, and track accumulated energy (AN1xAN2 x hours).
It monitors these terminals for voltage dips and swells. An event on these terminals can be used to
trigger a waveform recording on all channels. And events on the mains terminals can include the
waveforms on these auxiliary analog measurements, too.
If you wish to use these channels, you will want to enable the channel so that it is recorded in
event files. Enable the appropriate channels in the [Channels] section of the Setup.ini file on your
PQube’s SD card.
Digital Input
Your PQube has a single digital input called DIG1. It is a voltage input with respect to your PQube’s
Earth terminal.
It is rated at 60VDC or 30VAC, maximum, with respect to earth. The digital input is wetted with
+5.4Vdc at 3μA, and has a logic threshold of approximately +1.5V with respect to your PQube’s
earth terminal. The digital input can be connected to dry contacts, TTL or open-collector outputs,
or logic signals that are 5Vdc, 12Vdc, 24Vdc, or any other signal less than 60Vdc or 30VAC.
There is an inherent digital-filter time constant of approximately 1 millisecond on this DIG1 input.
Recordings of events on the mains terminals include state of the digital input if you turn the
channel on in the Setup.ini file.
You can use your PQube’s digital input to monitor the state of a switch or a logic signal.
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