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8588A/8558A
Operators Manual
20
Common Mode Rejection - Use of External Guard Connection
When the source presents an unbalanced impedance to the measuring
terminals, and common mode voltages are present, use the GUARD terminal
with External Guard selected. Use and then (Ext. Guard) to
activate the GUARD terminal. See Input Terminal Selection (INPUTS).
Regardless of how the INPUT HI and LO terminals are connected, the GUARD
terminal should be referred to the source of common mode voltage, see Figure 4.
This minimizes errors caused by common mode currents in the measuring circuit
by providing a separate common mode current path.
R1, C1 = Input impedance
R2, C2 = Input-to-Guard
leakage impedance
R3, C3 = Guard-to-Case
leakage impedance
Vcm1, = Common Mode
Vcm2 Voltages
Icm = Common Mode
Current
Icm
Loop
adj061f.emf
Figure 4. External Guard Connections
AC Voltage
The AC Voltage function provides 2-wire measurements using the V INPUT HI
and LO terminals. Push to use the AC Voltage (ACV) function. The
Product makes true-rms ac voltage or ac+dc voltage measurements using a
proprietary sampling method with up to 10 MHz bandwidth. These ranges are
available:
10 mV to 1000 V, where the 10 mV to 100 V ranges provide 121.2 % overrange.
Full scale is 121.2 % of range for these ranges. For example, the 1 V range can
show up to 1.212 V. The 1000 V range can measure up to 1050 V rms.
Input impedance is selectable from 10 MΩ, 1 MΩ, or Auto when dc coupled. Auto
selects the highest impedance available.
24


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