Table 4-7 Input Protection And Low-Noise Preamplifier Analog Switching States - Keithley 2182 Service Manual

Table 4-7
Input protection and low-noise preamplifier analog switching states
Function
Q666 Q667 Q664 Q665 Q672 Q673 Q674
and Range
DCV1:
10mV On On
100mV On On
1V On On
10V On On
100V Off Off
DCV2: Q661 Q662 Q671
100mV On On
1V On On
10V On On
On On Off Off
On On Off Off
On On Off Off
Off On Off Off
Off Off On On
On
On
On
Troubleshooting
U645 U645
Pin 1, 16 Pin 8
Off On Off
Off Off Off
Off Off Off
Off Off Off
On Off Off
Off Off
Off Off
Off Off
4-15
U645
Pin 9
Off
On
On
On
On
On
On
On