Multiplexer Card Connections; Channel Resistance Tests - Keithley 7011-S Instruction Manual

5.3.3 Multiplexer card connections
The following information summarizes methods that
can be used to connect test inshumentation to the two
connector cards. Detailed connection information is
provided in Section 3.
Model 7011-S-Instrumentation
can simply be hard-
wired directly to the screw terminals of the connector
card. Jumper wires should be kept as short as possible.
Model 7011~C-Gne
method to make instrument con-
nections to the multiplexer card is by hard-wiring a 96-
pin female DIN connector then mating it to the connec-
tor on the Model 7011-C. Input and output shorting
connections can also be done at the connector. The con-
nector in the Model 7011~IQT-R connection kit (see Ta-
ble 3-2) can be used for this purpose. Pi identification
for the connector is provided by Figure 3-8.
CAUTION
After making solder connections to a
connector, remove solder flux as ex-
plained in paragraph 5.2. Failure to
clean the solder connections could
result in degraded petiormance pre-
venting the card from passing verifi-
cation tests.
Before pre-wiring any connectors or plugs, study the
following test procedures to fuIIy understand the con-
nection requirements.
5.3.4 Channel resistance tests
1. Turn the Model 7001 off if it is on.
2. Turn on the Model 196, and a.IIow it to warm up for
one hour before making measurements.
3. Connect ail input terminals of Bank A together to
form one common terminaI, as shown in Figure 5-
1.
4.
Set the Model 196 to the 3WR range and connect
the four test leads to the OHMS and OHMS SENSE
input jacks.
5.
Short the four test leads toaether and zero the
6.
7.
8.
9.
10.
11.
12.
13.
14.
Model 196. Leave zero enable: for the entire test.
Connect OHMS Hl and OHMS SENSE HI of the
Model 196 to the common terminal (jumper on
Bank A inputs). It is recommended that the physi-
cal connections be made at inputs 1 and 10 of Bank
A, as shown in Figure 5-l.
Connect OHMS LO and OHMS SENSE LO to the
HI (H) terminal of Bank A.
Install the Model 7011 in slot 1 (CARD 1) of the
Model 7001.
Turn on the Model 7001 and program it
to
close
Channel l!l (Bank A, Input 1). Verify that the resis-
tance of this path is <IQ.
Open Channel l!l and close Channel 1!2 (Bank A,
Input 2). Verify that the resistance of this path is
dL-2.
Using the basic procedure in steps 9 and 10, check
the resistance of Bank A HI (H) terminal paths for
Inputs 3 through 10 (Channels 1!3 through l!lO).
Turn off the Model 7001 and move the OHMS LO
and OHMS SENSE LO test leads to the LO (L) ter-
minal of Bank A.
Repeat steps 9 through 11 to check the LO (L) ter-
minal paths of BankA(ChamveIs l!l through l!lO).
Repeat the basic procedure in steps 1 through 13
for Banks B through D (Channels l!ll through
1!40).
Perform the f&wing steps to verify that each contact
of every relay is closing properly and that the resis-
tance is within speciiication.
5-3