Fluke 8588A Operator's Manual page 36

8588A/8558A
Operators Manual
With LoI ON, the behavior of auto ranging is modified such that the
Product will not auto range up from the 10 k
from the 100 M
the voltage compliance changes from 0.2 V to 2 V and 2 V to 20 V
on the respective range transitions. The higher compliance may
adversely affect a semi-conductor junction. The auto range down
behavior is the same as LoI OFF.
 (Measure Setup): Sets the aperture of the A to D converter and the Ohms
Filter. Aperture choices are:
•
•
When you select Manual, use the softkeys and the numerical keypad to edit the
aperture by PLC and Time. The smallest time aperture is 0 ns with 200 ns
increments and has an upper time limit of 10 seconds.
PLC refers to Power Line Cycles. A PLC at a 50 Hz line is 20 ms; a PLC at a
60 Hz line is 16.67 ms. The smallest aperture that can be set by PLC is 0.01. The
upper limit is the PLC equivalent of 10 seconds so is determined by the line
frequency setting (Instrument Setup). For a 50 Hz line setting, the maximum is
500 PLC, for a 60 Hz setting it is 600 PLC.
When the aperture is set by time, the display shows the nearest equivalent PLC
to 0.01 PLC precision. When the aperture is set by PLC, the display shows the
aperture in seconds with 200 ns resolution.
Use the navigation keys and  to choose the aperture setting method. The
aperture settings for Auto and Auto Fast for different resolution settings are
shown in Table 8.
Resolution
4
5
6
7
8
The Ohms Filter is selected using the navigation keys and either F1 OFF or F2
ON. The Ohms filter is a single-pole analog filter for increased noise rejection.
The Filter annunciator in the information portion of the display indicates that the
filter is active. The ohms filter is not available in 4W Tru Ohms.
32
Ω to 1 G
Auto, Auto Fast
Manual
200 μs
2 ms
1 PLC
0.2 s
2 s
Note
Ω
Ω range. This algorithm was chosen since
Table 8. Aperture Settings
Auto Fast
Ω
to 100 k range, nor
Auto
2 ms
1 PLC
0.1 s
1 s
10 s