Freedom R8100 SERIES, Operator'S Manual

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Figure 2.2.5.1-1 RF Power Meter screen
2.2.5.2 Voltmeter
Provides an AC and DC voltmeter mode for measuring the amplitude of electrical voltages at the Meter
In port with the following menu selections:
Select Voltmeter Mode
Choose AC Volts or DC Volts on a horizontal menu
AC Volts – Measures AC voltage applied to the Meter In port. The dBm computation assumes an
impedance of 600 Ohms. The full scale AC Range is selectable via a horizontal submenu.
Figure 2.2.5.2-1 AC Volts display
DC Volts – Measures DC voltage applied to the Meter In port. The full scale DC Range is selectable via
a horizontal submenu. Note: If there is a DC offset apparent with no input connected it can be zeroed out
by using the Set DC Offset function.
Note: Pressing Display Zone, Oscilloscope, Set DC Offset soft key zeros or compensates for any
accumulated DC offset caused by drift in the input amplifier of the R8100 over long periods of time. This
may show up as a DC level indicated on the Oscilloscope and DC Voltmeter when no input is connected
to the Meter In port. With the Meter In port disconnected press the soft key to eliminate the offset. The
compensation is stored permanently in the R8100 until the next time this soft key is pressed.
Figure 2.2.5.2-2 DC Volts display
AC Range
Available when Select Voltmeter Mode is AC Volts. Choices include Auto (auto-ranging), 1 Volt, 10
Volts, and 70 Volts RMS. Note: The range on AC and DC must be 1 or 10 Volts to use 600 Ohm Input
Impedance (see System Settings).
Set dBr Reference