National Instruments BNC-208 Series, Руководство пользователя

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BNC-2080 Board Chapter 2
BNC-208X Series User Manual 2-10 © National Instruments Corporation
analog (ACH8 through ACH15) BNC connectors are not used. The MIO-16 board must also be
configured for differential input. The jumper W1 position is irrelevant in DIFF mode.
SE
DIFF
J3
ACH0
J9
ACH8
S2
SE
DIFF
J3
ACH0
J9
ACH8
S2
DIFF Mode
(Factory Default Setting) SE Mode
Figure 2-7. Switch Configurations for Differential Mode or Single-Ended Mode
Note
: All of the switches are required to be in the same position; that is, S1 through S4 and S6
through S9 must all be in either the DIFF position or in the SE position.
The single-ended mode is configured by flipping the switches next to each pair of BNC connectors
to SE. This must be done to
all
eight switches in order to have 16 single-ended channels. In the
single-ended mode,
all
16 BNC connectors are in use. In the single-ended mode,
all
16 BNC
cases are tied to the COMMON signal. The COMMON signal can be switched between AIGND
and AISENSE through jumper W1. See Figure 2-8. AISENSE is tied to COMMON for NRSE
mode configuration and AIGND is tied to COMMON for RSE mode configuration.
RSE NRSE
W1
• •
W1
AISENSE
AIGND
COMMON
• •
Figure 2-8. W1 Ground Reference Jumper
The three configurations of the BNC-2080 board corresponding to the input mode configuration of
the MIO-16 are shown in Figure 2-9 and Figure 2-10.