Fluke 8508A User Manual page 53

INPUT HI
SENSE HI
GUARD
SENSE LO
INPUT LO
Internal Guard Connections
not selected: In the Ohms or PRT Functions the Guard terminals on the
External Guard
front and rear panels are isolated from each other and from any internal connection. The
internal guard shields and tracks are connected directly to the internal 0 V.
selected: In the Ohms or PRT Functions selecting the External Guard
External Guard
provides an Ohms Guard function. The internal guard shields, tracks, and the selected
front or rear Guard terminal are connected to the internal 0 V.
Guard terminal front
External Guard
Internal Guard and External Guard
(OHMS and PRT)
Figure 3-10. Internal Guard Connections
Selecting External Guard (ExGd)
See Figure 3-9 for connections when using the
To select
External Guard
1. Press to enter the
Input key
2. Press the menu key ExGd to toggle the Multimeter's Guarding options.
The ExGd annunciator on the left-hand display indicates that External Guarding is
selected.
SENSE HI
GUARD
SENSE LO
Figure 3-9. Guard Measurements
Guard terminal rear
Rear
Front
Internal Guard
External Guard
(DCV & I, ACV & I)
0 V
:
menu.
INPUT
INPUT Menu
Making Measurements
Using the Measurement Functions
Metal
Screen
INPUT HI
Ra
Rx
Rb
Rg
INPUT LO
Internal Guard
Shield and Tracks
feature.
Guard
3
adj095f.eps
adj062f.eps
adj064f.eps
3-19