Rear Panel Description - Keithley 705 Instruction Manual

6. The SCAN group of buttons
consists of the SINGLE, CON-
TINUOUS and START/STOP buttons. These three buttons
select the different scan modes. The SCAN group of but-
tons are described as follows:
A. The CONTINUOUS button selects the continuous scan
B.
C.
mode. The continuous scan mode allows the user to
scan through the programmed channels at the program-
med interval rate continuously. The continuous scan
mode is initiated upon the actuation of the
START/STOP button or upon receiving the appropriate
external trigger pulse. Pressing the START/STOP but-
ton while the continuous scan mode is running stops the
scan at the presently displayed channel. Pressing the
START/STOP button again starts the continuous scan
at the channel in which it was stopped.
The SINGLE button selects the single scan mode. The
single scan mode allows the user to scan through the
programmed channels at the programmed interval rate
one time. The single scan mode is initiated upon the ac-
tuation of the START/STOP button or upon receiving
the appropriate external trigger pulse. Pressing the
START/STOP button while the single scan mode is run-
ning stops the scan at the presently displayed channel.
Unless interrupted, the single scan mode will scan
through the programmed channels at the programmed
interval rate and then stop at the programmed first chan-
nel.
The START/STOP button is an alternate action control
that has three functions. The three functions are the
START function, the STOP function and the STEP scan
mode. They are described as follows:
a. The start function of the START/STOP button in-
itiates the selected scan mode. When all the para-
meters (interval, time, first and last channels, scan
mode, etc.) of a multichannel configuration have
been programmed and the user is ready to scan the
channels, press the START/STOP button to initiate
the scan. During the scan mode the START/STOP
LED is activated.
b. The stop function of the START/STOP button stops
the previously initiated scan mode. That is, pressing
the START/STOP button during a scan stops the
sequence at the presently displayed channel and turns
off the START/STOP LED. The stop function of the
START/STOP button is active only when a scanning
sequence is scanning.
c. The step scan mode allows the user to manually step
through the programmed channels. The step scan
mode is selected by pressing the channel button, pro-
gramming the interval time and pressing the
START/STOP button. When the interval time has
been programmed and the user is ready to manually
scan the channels, press the START/STOP button to
scan (closed and open channel at the programmed in-
terval time) one channel. Upon initiating the step scan
mode the START/STOP LED turns on, the presently
displayed channel is closed for the programmed inter-
val rate, the channel is opened, the START/STOP
LED turns off and the Model 705 advances to the next
channel. To scan the next channel press the
START/STOP button and the Model 705 will go
through the same sequence.
7. The CLOCK group consists of two buttons that control the
display of the time function and the date function. The clock
continues to run after the instrument is powered down
because the clock's power circuitn/ is backed up by battery
BTlOl. The two clock buttons are described as follows:
A. The TIME button selects for display the 24 hour time
clock. The format showing 2:45 p.m. is as follows:
I IYYS.UU /
i I
The time can be set by pressing the TIME button, enter-
ing the appropriate time onto the display and then press-
ing the ENTER button.
B. The DATE button selects the date mode for display. The
date display has two formats., The formats showing
Auaust 18th are as follows:
American date format
cl0 I8
International date format
Ifm3 I
I I
The formats are selected by front panel Program 1. Refer
to paragraph 2.5 6 for information concerning the front
panel programs. The date can be set by pressing the
DATE button, entering the appropriate date onto the
display and then pressing ENTER.
8. The PRGM button when pressed shows a display that pro-
mpts the user to select one of the 13 front panel programs.
Refer to paragraph 2.6 for complete details and examples of
the front panel programs.
9. The IEEE bus indicators (TALK, LISTEN and REMOTE)
identify the present status of the IEEE-488 bus. The in-
dicators are described as follows:
A. The TALK LED when lit indicates that the Model 705 is
in the talk mode. The Model 705 does not have to be in
the remote mode for it to be in the talk mode.
B. The LISTEN LED when lit indicates that the Model 705 is
in the listen mode. The Model 705 must also be in the
remote mode for it to be in the listen mode.
C. The REMOTE LED when lit indicates that the Model 705
is in the remote mode.
2.5.2 Rear Panel Description
1. The two plug-in slots in the Model 705 mainframe can ac-
comodate two relay scanner cards. The Model 705 with two
relay scanner cards has up to 20 2-pole individual channels.
Refer to paragraph 2.2.2 for instructions on how to remove
or install the various plug-in cards.
2-5