Table of Contents
Advertisement
2. The EXTERNAL
TRIGGER is a BNC connector
that initiates
the selected
scan mode (single, step or continuous)
in the
same manner as the START/STOP
button,
The input trig-
ger pulse must be a negative
going pulse at a TTL level with
a minimum
duration
of 2+ec.
The selected
program
mode
is initiated
upon the negative
transition
of the pulse. This
feature
can be used to trigger
the
Model
705
into
the
selected
scan mode using another
instrument.
3. CHANNEL
READY is a BNC output
connector
that provides
a negative
going TTL level pulse of greater
than lO@ec at
the completion
of the programmed
channel
settling
time.
This feature
can be used to inform
another
instrument
(e.g.
DMM,
Source,
etc,) that the present channel settling time is
completed.
4. The ALARM/SERIAL
IN connector
has two functions.
The
Alarm
out function
and the SERIAL
IN function.
As the
Alarm out function
the Model 705 outputs
a negative
going
TTL level greater than 10pec
pulse to the ALARM/SERIAL
IN connector.
When the Alarm time is set to 00.00.00
the
pulse does not appear. The SERIAL
IN function
is used in a
daisy chain configuration
where the SERIAL IN connector
is
connected
to the SERIAL OUT connector
of another
Model
705. Refer to paragraph
2.5.3 example
4 for more informa-
tion.
5. SERIAL OUT is a BNC output
connector
that provides
con-
nection
to another
Model
705 for a daisy chain configura-
tion. Refer to Figure 2-3 for a typical
daisy chain configura-
tion.
The
SERIAL
OUT
connector
is applied
to
the
ALARM/SERIAL
IN connector
of another
Model 705.
6. The Digital I/O port consists of 16 digital input/output
lines
along with four lines that are + 5V and IEEE common.
Eight
of the I/O lines can be used for inputs and eight can be used
for outputs.
This allows the user a limited number
of control
lines to the IEEE bus. The outputs
will drive one TTL load
and the inputs
are TTL compatible.
For more information
concerning
the digital I/O port refer to paragraph
3.5.8/16.
7. The
IEEE bus connector
provides
bus connection
to the
Model
705. The connector
mates with the Keithley
Model
7008-3
and Model
7008-6
cables.
For more detailed
infor-
mation
concerning
the IEEE connector
refer to paragraph
3.3.
8. The line power fuse is rated as specified
in Table 5-l.
9. The line power
receptacle
mates with three wire line cord
which
provides
connections
to line voltage.
For correct line
voltage
selection
refer to paragraph
5.3.
2.5.3 Basic Front Panel Operation
This section provides
the information
necessary for basic front
panel operation
of the Model 705. There are a number of steps
to follow
in order to get the Model
705 ready for scanning
operation.
These steps are as follows:
1. Install the desired scanner card(s). Refer to paragraph
2.2.2
for information
concerning
the installation
of the scanner
cards into the Model 705.
2. Select appropriate
line voltage.
Refer to paragraph
2.2.1 for
information
concerning
the selection
of the appropriate
line
voltage.
Turn
the
Model
705 on.
The
instrument
goes
through
the power-up
sequence described
in paragraph
2.3
and displays the following:
I III
f
o!
NOTE
Channel 1 is set as the programmed
first channel,
unless the unit was previously
programmed
for
another
channel then that channel
is displayed.
3. Program
the desired channel.
A. Select the first channel.
a. Press the desired
channel
number
from
the DATA
group buttons
O-9.
b. Press the FIRST button to program
the present chan-
nel as the first channel.
NOTE
Selecting
a channel that does not exist in the pre-
sent set up causes the Model 705 to display the
following
message.
/-Ia
l-h
9. Select the last channel:
a. Press the desired number from the DATA group but-
tons O-9.
b. Press the LAST button
to program
the present chan-
nel as the last channel.
4. Program
the desired number
of poles (I-, 2- or 4-pole).
A. Press PRGM.
9. Press 6 (refer to paragraph
2.6.7).
C. Select number
of poles l-, 2- or 4-pole.
D. Press ENTER.
5. Program
the interval time
A. Press the INTERVAL
button
to select the interval
mode
for display.
9. Enter the interval
time on the display
by pressing from
the
DATA
group,
desired
time
000.010
to 999.999
seconds.
C. Press the ENTER button.
6. Program the desired scan mode. Press the SINGLE or CON-
TINUOUS
button
to select
one
of these
two
scanning
modes. To select the step scan mode press the channel but-
ton and the START/STOP
button.
7. Press the
START/STOP
button
to start
the
scanning
sequence.
For the step scan mode press the START/STOP
button
each time a single channel
is to be scanned.
2-7
Advertisement
Table of Contents
