Keithley 706 Instruction Manual page 22

Step
1
2
3
4
5
6
7
8
9
10
Table 2-9. Continuous Scan Example
Action
Comments
Refer to paragraph 2.2.2. Install 10 Model 7056s into slots
I-IO of the Model 706.
Select appropriate line voltage
and turn on the Model 706.
Press PRGM, 6.
Press 2, ENTER.
Press 0, 0, 1, FIRST.
Press 1, 0, 0, LAST.
Press INTERVAL, 0, 0, 0, 3,
0,0, ENTER.
Press CHANNEL, RESET.
Press CONTINUOUS.
Press START/STOP.
Initiates the continuous scan sequence.
Selects PROGRAM 6.
Selects the 2-pole mode. Refer to paragraph 2.9 for more
information about front panel programs.
Programs channel 1 as the first channel.
Programs channel 100 as the last channel.
Programs the interval time for 0.3 seconds.
Turns on the CHANNEL LED, selects the channel
mode for display and resets to the programmed first
channel.
Selects the continuous scan mode and turns on the
CONTINUOUS LED.
Upon the actuation of the START/STOP button in step 10,
channel 1 is closed and the START/STOP LED is turned on.
Channel 1 remains closed for 0.3 seconds (programmed inter-
val rate) and then opens. Model 706 advances to the next
channel and closes it for the programmed interval rate and
then opens it.
of available channels to 500. The method of connection is
shown in Figure 2-4 and is referred to as a daisy chain con-
figuration.
This sequence continues up to and including the last pro-
grammed channel. At this point the Model 706 reverts to the
programmed first channel and repeats this scan sequence
continuously.
Pressing the START/STOP button during a continuous scan
sequence stops the scan at the presently displayed channel.
The channel remains closed and the START/STOP LED
turns off. To continue the scanning sequence from the
presently displayed channel press the START/STOP button.
One of the Model 706 scanners is programmed (by user
choice) as the master control instrument of the configuration.
The other Model 706 scanners are programmed as the slaves.
As slaves, the front panel controls of these instruments are
locked out (not functional) except for the power switch, front
panel Program 90 and 91, The power switch is functional but
when power is cycled the slave instrument powers up to the
slave condition. The only method out of the slave condition is
to activate Program 90 or 91. For complete details concerning
front panel programs refer to paragraph 2.9.
In this example the master Model 706 will be programmed to
scan 500 channels. The equipment required for this example
is shown in Table 2-9. For the sake of simplicity we will use
Model 7056 general purpose scanner cards for this example.
To help illustrate this daisy chain example we will choose the
To stop the scanning sequence and reset the Model 706 to
the programmed first channel (which is 1 in this example)
simply press the RESET button.
following parameters:
1. First Channel is 1.
Example 4 Daisy Chain Configuration-In a situation
where more than 100 channels are required the Model 706
can be connected to other Model 706 scanners to increase
the number of available channels. A total of five Model 706
scanners can be connected together to increase the number
2. Last channel is 500.
3. Interval time is 0.2 seconds.
4. Number of poles is 2.
5. Use continuous scan mode.
Table 2-9. Required Equipment for Daisy Chain Example
Description Specification Mfg. Model Qty
Scanner Mainframes - Keithley 706 5
Scanner Cards General Purpose Keithley 7056 50
Cables BNC to BNC Keithley 7051-5 5
2-10