Keithley 486 Instruction Manual page 147

SECTION 6
Theory of operation
Table 6-2. Filter Relay Switching
Analog Filter Enabled
Analog Filter Disabled
Filter Relay Switches*
Filter Relay Switches*
Range A B C D E A B C D E**
c=~ela~~tit~aosed
0 = Relay Switch Open
'Relay switches A through E are shown in Figure 65.
'Tern check disbkd. With zero check enabled, Relay E is closed (Cl far alI
current ranges.
(A)
U144
+ 2.w Referance IS
14
To ND
Input
(c)
U144
Signal
2/L
Figure 6-6.
Multiplexer
6-4