Operating Instructions For All Modes; Interpreting The Measurement Display - Fluke 5790A Operator's Manual

Whenever EXT GUARD is activated (the green indicator on the EX GRD
key is on), you must refresh the guard status after the instrument changes
from the 220V range to any higher range. To refresh, push the EX GRD
key two times (once to turn the indicator off, and once to turn the indicator
on). If using the remote interface, send the commands EXTGUARD OFF,
and followed by EXTGUARD ON.

4-14. Operating Instructions for all Modes

Whether your application involves measurement mode or transfer mode, you may select
certain measurement parameters. Among them is the Digital Filter Mode and Restart
threshold, accessible through the Meas Control menu. This and other measurement
parameters are described next.

4-15. Interpreting the Measurement Display

The Measurement Display shows the measured input voltage and frequency on two lines.
Features and functions of the Measurement Display are summarized in Table 3-1 in
Section 3. Table 4-5 shows the amplitude resolution displayed for each range. Note how
the setting of the digital filter, described under the next heading, affects resolution. Table
4-6 shows the frequency display resolution.
Table 4-5. Measurement Display Amplitude Resolution
Input Range
Filter off or fast filter medium or
1000V
700V
220V
70V
22V
7V
2.2V
700 mV
220 mV
70 mV
22 mV
7 mV
2.2 mV
Note
Input 1 and 2
slow and hi res off or hi res on
1000.000 1000.0000
700.000 700.0000
220.0000 220.00000
70.0000 70.00000
22.00000 22.000000
7.00000 7.000000
2.200000 2.2000000
700.000 700.0000
220.0000 Same
70.0000 Same
20.0000 Same
7.0000 Same
2.200 Same
Front Panel Operation

Operating Instructions for all Modes

Wideband Input
Filter off or fast filter medium or slow
and hi res off or hi res on
N/A
N/A
N/A
N/A
N/A
7.0000
2.20000
700.00
220.000
70.000
20.0000
7.0000
2.2000
4
N/A
N/A
N/A
N/A
N/A
7.00000
2.200000
700.000
220.0000
70.0000
Same
Same
Same
4-11