8508A
Users Manual
Internal Guard Connections
External Guard
not selected: The Guard terminals on the 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 0V.
External Guard selected: The internal guard shields and tracks are disconnected from the
internal 0V, and connected to the
Guard terminal of the selected front or rear input.
Ohms Guard: In the Ohms or PRT Functions the External Guard selection is modified to
provide an Ohms Guard. In these cases the internal guard shields, tracks and selected
front or rear Guard terminal are connected to the internal 0V.
The simplified diagram in Figure 3-4 illustrates the switching arrangement.
Guard terminal front
External Guard
Internal Guard and External Guard
(OHMS and PRT)
Front
Guard terminal rear
Internal Guard
External Guard
(DCV & I, ACV & I)
Internal Guard
Shield and Tracks
Rear
0 V
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Figure 3-4. Internal Guard Connections
Selecting External Guard (ExGd)
See Figure 3-3 for a description of External Guard Connections.
To select
External Guard:
1. Press
Input key to enter the INPUT menu.
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INPUT Menu
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.
AC Voltage
Press the
ACV key to see the ACV menu.
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ACV Menu
This function provides both 2-wire and 4-wire measurements, in decade
ranges from 200mV to 200V and a 1kV range.
To cancel autoranging and enter a manually selected range, press any range
selection or the Auto softkey. The Multimeter enters the selected range or
reverts to the auto-selected range.
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