one reading per hour are available. A special trigger mode
allows you to control the interval with the TRIG button.
During the rate selection process, the display will appear as
follows:
r=3
In this example, the rate parameter is 3, indicating a 1
rdg/min interval.
Table 2-7. Data Store Reading Rates
5
L-
6
Rate
Conversion Rate (every 360mse.c)
1 Reading Per Second
1 Reading Every 10 Seconds
1 Reading Per Minute
1 Reading Every 10 Minutes
1 Reading Per Hour
Front Panel Trigger Mode
2. To select the desired interval, simply release the ON/OFF
button when the desired rate appears in the display. The
Model 617 will then begin storing readings at the selected
rate. If you selected the triggered mode, one reading will be
stored in memory each time the front panel TRIG button is
pushed.
For rapid starts, the rate can be pre-selected by pressing
ON/OFF, releasing the button when the selected rate is dis-
played, and then turning off data store. Storage will then
begin at the pre-selected rate the next time the ON/OFF
button is pressed.
3. When data store memory is full (after all 100 readings have
been stored), the instrument will stop logging data, and the
DATA LED will flash to indicate that memory is full.
4. Readings can be recalled any time (even if the instrument is
still logging) by pressing and holding the RECALL button.
Holding the RECALL button in causes the data pointer to
be displayed. Releasing the RECALL button causes the cor-
responding data to be displayed. The first data point to be
displayed will be the last reading stored. For example, if
reading #65 was the last point, the display will show:
n=65
5. The second and third points will be the high and low data
points. For example, for the high value, the display will
show:
n=HI
Similarly, the display will show the following for the low
data point:
n=Lo
6. Following these three points, the remaining data points will
be displayed, beginning with the first one stored. The data
pointer will increment from 1 to the maximum point
stored. For example, the tenth reading appears as:
n=lO
7. To continue recalling readings, use the RECALL button to
scroll the data pointer. Scrolling becomes more rapid if the
RECALL button is held in. Release the button when the
desired data point is displayed.
8. The recall mode can be cancelled simply by pressing SHIFT
RECALL. The instrument will then return to the normal
display mode. As long as data store is not disabled and
then w-enabled, readings are retained within memory.
You can return to the recall mode at any time to review
data.
9. To cancel data store operation, press the ON/OFF but-
ton. The ON/OFF LED will turn off, indicating that data
store is disabled. Data is retained until data store is en-
abled once again. Thus, you can still recall data eve”
after data store is turned off.
Data Store Operating Notes:
1. Data logging continues at the selected rate during the recall
until all 100 locations have been filled. Logging stops when
all 100 locations are full, as indicated by the flashing
DATA indicator.
2. The data store trigger mode should not be confused with
the front panel trigger mode. The data store trigger mode is
enabled by entering the special trigger parameter (r=6) at
the beginning of the data storage process, while the front
panel trigger mode is entered by pressing SHIFr TRIG.
3. If the instrument is placed in the front panel one-shot trig-
ger mode, display readings will be triggered at the data
store rate interval except when r=O. For example, if the in-
strument is set up for 10 minute intervals, one reading will
be triggered and displayed every 10 minutes. When r=O, a
single reading is stored each time a” appropriate trigger is
received (for example, GET in the T3 trigger mode, as
described in paragraph 3.10.14)
4. The data store rate can be used to control the data output
rate in the IEEE-488 talk-only mode. To use the Model 617
in this manner, place the instrument in the talk only mode
(see paragraph 3.7). Now enter the data storage mode and
select the desired interval as described above. The instru-
ment will then output readings over the IEEE-488 bus at the
selected rate.
5. The storage rate in r=O and r=l may be affected if the in-
strument is in autorange and a range change occurs.
Typically, it takes about 350msec per range change.
2-28
To Next Page
Loading...
Need help?
General
