Keithley 7999-2, Instruction Manual

Page: 19 / 44

2-4 Connections
Simplified schematic
Figure 2-2 shows a simplified schematic diagram of the Model 7999-2. The card is arranged
into two multiplexer banks:
• One bank of 3:1 3-pole switching
• One bank of 4:1 switching
NOTE Single pole switching is shown in Figure 2-2 for simplicity. H, L, and G indicates
separate HI, LOW, and GND signal switching. + and - switched to HI and LOW
where applicable. See the schematic diagram at the end of Section 5 for details.
XEAR
(H,L,G)
BUZZ_MIC
(H,L,G)
EAR_MIC
(H,L,G)
LEVELING_MIC
(H,L,G)
XMIC
(H,L,G)
LSP
(H,L,G)
SPECIAL_AUDIO
(H,L,G)
NOTE: Single-pole switching shown for simplicity. H, L, G
indicate separate HI, LOW, and GND signals. + and
- switched to HI and LOW where applicable.
AUDIO_IN
(H,L,G)
DVM (+,-)
AUDIO_OUT
(H,L,G)
MEASVOLT (+,-)
Figure 2-2
Simplified schematic