Keithley 172A Instruction Manual page 35

INSTRUCTION MANUAL
Digital Multimeter
Models 172A. 173A
OPERATING INSTRUCTION5
r---------- _---------_
1
I
2 4 6 8 10 1214 1618 20 222426
1 PIIOI
1' ' J
I
I 7 9
1 3'5
1113151719212325 I
L ______ ----------,----I
r----------------------------l
I
2 4 6 8 10 121416 182022242628303234 363840 I
, PI006
I
I
t---------------------- -_---_ -1
1 3 5 7 9 111315 17192123252729313335 3739
FIGURE 3-10.
Connector Pin identification for ~1006 and PIIOI.
FIGURE 3-11. Card-Edge Connectors (Model I727 Cable Set)
d.
How to Select Vext Using Internal Jumper. The Model 1722 may be wired for use with
internal or external voltage references and internal pull-up resistors. (See Figure 3-9).
1.
Jumper A. When this jumper is installed, the pull-up resistors are connected to
the external reference Vext (pin a, ~1006).
2. Jumper 5.
When this jumper is installed, the pull-up resistors are connected LO
the internal reference (+SV).
3.
Jumper C.
When this jumper is installed,
Vext is connected to internal +5V
reference. The pull-up resistors are not connected in this instance. The +5 volt
reference is rated at 40 mA maximum.
3-17