Fluke 8588A Operator's Manual page 26

8588A/8558A
Operators Manual
 (RMS Filter): Push to select various filters for the rms converter, allowing
measurements down to the chosen filter frequency without degradation of
accuracy and excessive reading variation. One of the filters is always in circuit.
The 40 Hz filter is the default selection at power on. The filter choices available
are 0.1 Hz, 1 Hz, 10 Hz, 40 Hz, 100 Hz and 1 kHz. See Specifications. Use the
softkeys or the navigational keys to highlight the selection and then push .
Push  to return the Product to the previous menu.
 (Measure Setup): Has parameters that can be set up for ac voltage
measurements. Use the softkeys or the navigational keys to highlight the
selection and then push . Push  to return the Product to the
previous menu. See the screen below:
The parameters under this menu are:
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Signal path coupling, impedance: (note that this selection determines what
is available in Frequency path coupling) these different combinations of signal
path coupling and impedance are available:
o  (AC, 1 MΩ)
o  (DC, 1 MΩ)
o  (AC, 10 MΩ)
o  (DC, 10MΩ)
o  (DC, Auto)
Most applications should use the 1 MΩ input impedance (default) as the
10 MΩ input has relaxed specifications. DC Auto selects the highest
impedance available for any given range.
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