4-20
Nominal Values, continued
Frequency
synchronization
Normal frequency synchronization (sync) of HDPQ Xplorer analog signal processing
circuits is controlled by analyzing the external AC voltage signal input on CH A (or CH
D according to setup). Loss of external sync causes the HDPQ Xplorer to hold the last
valid frequency for the synch channel until adequate frequency returns. If none exists,
then internal sync is automatically selected. The frequency used for internal is entered
under Frequency on the Nominals screen.
NOTE: Failure to connect an external sync or to select an internal sync during current
monitoring will result in erroneous data being collected and displayed.
Frequency
tracking
Tracking determines how the phase locked loop circuitry responds to sudden changes
in frequency.
Standard mode
: On a normal power quality application [Standard], the system is
designed to “ride through” voltage changes to keep steady the fundamental frequency
in the absence of voltage, or to track slow changes of frequency as the generators are
adjusted by system operators.
Fast mode
: When operating on a local or backup generator [Fast], the frequency will
vary more as loading changes occur. The Fast mode allows the instrument to follow
these changes more closely.
Internal mode
: In cases where no reference signal is available (such as DC monitoring),
the Internal setting is used to set the sample rate.
Shop for Power Metering products online at:
1.877.766.5412
www.PowerMeterStore.com
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