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Changing the Frequency Measurement Mode in ATPOL II
To determine which frequency measurement mode ATPOL II is in, simply press the [Measure Mode]
key twice and read the display. To change the frequency measurement mode from what is displayed,
press the [No/Reject] key and then press [Yes/Accept] when the desired measurement mode is
displayed.
The frequency measurement mode that you choose will stay in effect until you change it. It will not be
changed by turning ATPOL II off.
Changing the Frequency Measurement Mode in PSM
To determine the frequency measurement mode using PSM, connect ATPOL II to PSM and then either
go to the Setup Data menu and read what appears in the Input Frequency box or operate in Remote
Control mode and press the key combinations described above.
To change the frequency measurement mode using PSM, either go
to the Data Setup menu, click on the Input Frequency drop-down
box, select the mode that you wish to operate in, and then send the
new setup to the connected ATPOL II meter or operate in Remote
Control mode and press the key combinations described above.
Always Positive Power versus Negative Power Allowed
There are 3 power measurement modes in ATPOL II:
Always positive power
Negative power allowed
2 current probe approach.
Most users perform measurements on equipment that is either always consuming power or always
generating power. However, there are cases in which you may wish to measure power use on
equipment that is alternatively consuming and generating power (like an oil well pump jack). Always
Positive Power measurement mode and Negative Power Allowed measurement modes are provided to
allow ease and accuracy of measurement in both types of situations.
When ATPOL II is shipped from the factory, it is set for Always Positive Power measurement mode. In
a typical setup, if you connect a current probe backwards, the power for that phase will appear to be
negative. In Always Positive Power measurement mode, ATPOL II senses this and automatically turns
the current probe backwards in software so that all phases measure positive power. This automatic
correction is provided to assist our customers, allowing them to concentrate on readings rather than
connections under most circumstances. Accuracy may be slightly better when the probe is oriented
correctly, but for most measurements this added accuracy is of no significance with ATPOL II. If
current and power readings of the highest accuracy are necessary, use the Checkout Connections
feature that is discussed earlier in this manual or view the waveforms in order to ensure that current
probes are connected correctly.
If you need to monitor equipment that alternately consumes and generates power, you need to select
the Negative Power Allowed measurement mode. In this mode, positive and negative power readings
for each phase are accepted and are combined to find the net power usage. Depending on the result,
Summary of Contents for ATPOL II
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