Information
Display
13
6
INFORMATION DISPLAY
6.1
Startup Screen
Each time power is applied to the Watt's Up SOURCE leads, a startup screen with
firmware revision number is briefly displayed, and then measurement begins.
Startup Screen
RCE v2.0
6.2
Measurement Screen
The measurement screen is displayed after the startup screen. Amps, Volts and Watts are
continuously displayed.
All other measured values are presented sequentially, every 2
seconds, in the "Data-Queue®" (DQ) position of the display.
All data values are
identified by their units (e.g.
Ah, Wh, Ap, Vm, Wp
). All measurement screen values are
updated every 400 mS.
Note that the Amps, Volts and Watts values are continuously
displayed.
The Measurement Screen layout:
Amps, Volts, Watts and the "Data Queue" *
100.00A
10.00V
The "Data Queue" shows Ah, Wh,
Ap, Vm, Wp in sequence.
Data Queue
1000.0W
* Note: the Doc Wattson screen has Volts and Amps in the same column.
6.2.1
(Current) Amps A, Peak Amps Ap
The Amps value displayed is the average current flowing through the Watt's Up's black
wire over the last screen update interval. The displayed Peak Amps value (Ap) is the
maximum current drawn on the LOAD side, since the startup screen ended. Watt's Up
circuit operation draws a slight amount of current (7 mA) from the SOURCE side. Being
hundreds of times less current than is drawn by typical loads, this slight additional current
can be ignored and the SOURCE’s current be considered equal to the LOAD’s current for
most practical purposes. Amps values are measured on the LOAD side. Currents over 50
Amps should be measured for reduced time due to wire heating.
6.2.2
(Voltage) Volts V, Minimum Volts Vm
The Volts value displayed is the average voltage over the last screen update interval. The
displayed Minimum Volts value (Vm) is the minimum voltage (or “sag”) measured on the
SOURCE side, since the startup screen ended. The Volts value is measured on the
SOURCE side.
6.2.3
(Energy) Watt-hours Wh
The value displayed is the total energy delivered to the LOAD in Watt-hours since power
was applied to the Watt's Up. It is measured on the LOAD side. For accurate results, be
careful not to interrupt the SOURCE connection to the Watt's Up during an energy
measurement. Doc Wattson reports in KWh which is 1000 Wh.
6.2.4
(Charge) Amp-hours Ah
The value displayed is the total charge in Amp-hours delivered to the LOAD since power
was applied to the Watt's Up. It is measured on the LOAD side. For accurate results, be
careful not to interrupt the SOURCE connection to the Watt's Up during a charge
measurement.
"Watt's Up" & "Doc Wattson" Watt Meter and Power Analyzer User's Manual
RC Electronics, Inc.
