1. My PowerScout and PowerPro both reported a voltage sag on the same voltage supply at the same time but the magnitudes were different, which is correct?
   
   
2. On a 1P3W system can I measure the line-line voltage at the same time that the two line-neutral voltages are measured?
   
   
3. Can I measure three separate single phase circuits at the same time?
   
   
4. My computer timed out while upgrading my Power Pro's firmware and now the Power Pro does not work properly, what can I do?
   

1. My PowerScout and PowerPro both reported a voltage sag on the same voltage supply at the same time but the magnitudes were different, which is correct?
   
   Ans: The PowerPro is correct. The PowerScout is not designed to be a power quality monitor. The PowerPro and PowerScout use different technologies to measure voltage and current. The PowerScout uses analog RMS-DC converters which have time constants in the order of 200 milliseconds. The PowerScout samples data every 1/4 second and will probably detect transients that are less than 200 milliseconds but the deviation recorded will be less than the actual deviation. The PowerPro uses a direct waveform sampling technique that accurately measures magnitudes every 1/2 cycle, all RMS transients will be captured accurately.
   
   

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2. On a 1P3W system can I measure the line-line voltage at the same time that the two line-neutral voltages are measured?
   
   Ans: Yes, but you must configure the logger for a 3P4W connection. Connect V1 and V2 as shown for the 1P3W connection and connect V3 from L1 to L2. Do not connect CT for I3. In 'TRIGGER LEVELS' set the line voltage to the line-neutral voltage and adjust V1 and V2 over/under voltage levels to the desired values and adjust V3 levels to twice those values (or any desired value). When recording is started the logger will report a 'Voltage Hookup Error', press 'IGNORE' and continue.
   
   

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3. Can I measure three separate single phase circuits at the same time?
   
   Ans: Yes, but you must configure the logger for 3P4W connection. Connect the three voltage inputs and three current inputs to the three single phase circuits. When recording is started the logger will report a 'Voltage Hookup Error', press 'IGNORE' and continue.
   
   

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4. My computer timed out while upgrading my PowerPro's firmware and now the PowerPro does not work properly, what can I do?
   
   Ans: First, remain calm - the bootload firmware on the PowerPro cannot be erased or corrupted, only the application firmware can be changed. If a problem occurs while upgrading the unit's firmware you just need to repeat the process. If the timeout problem repeats you should check your computer's serial port settings. Often the problem is that the serial port receive buffer is too large. To check this, from the desktop click on "My Computer" then "Control Panel" then "System" then "Device Manager" then "Ports" then select the serial communication port you are using (usually "COM1" or "COM2" but it could be "COM3" or "COM4") then "Port Setting" then "Advanced", on this screen the "Use FIFO buffers" box should be checked, you will see two slider bars, one for the receive buffer and one for the transmit buffer. Slide the receive buffer slider to the left (towards the Low setting). If your problem persists please email us and we will help you sort it out.

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