Pulse Specifications - Keithley 193 Instruction Manual

OPERATION
4. If it is desired t" change the size of the data store, enter
the size value. The procedure to enter data is explained
in step 2. If an attempt is made to enter a data store size
greater than 500, the size will default to 500.
NOTE: Up to this point, pressing the RESET button will
disable the data store and return to the previous state
of operation.
5. With a data store size displayed, start the storage pro-
cess as follows:
A. If a storage interval other than 000.000 is selected,
press the ENTER button. The following message will
be displayed briefly:
ENTERED
Readings will then start storing at the selected inter-
val. The storage process is indicated by the flashing
DATA STORE indicator light. The light stops flashing
(remains on) when the data store is full.
NOTE: If a high speed interval is selected (lms, Zms,
3ms or 4ms), the display will blank for a short period
of time while the readings are being stored. If the
instrument is in an invalid operating state for high
speed data storage (see Table 2.7), the inshumcnt will
exit the data store mode.
B. If storage is to bc done manually (one-shot mode
000.000 interval selected), press the ENTER button.
The following message will be displayed briefly:
ENTERED
'The prompt for a trigger will then be displayed. The
following example display shows the instrument on
the ZVDC range:
VDC
Each press of the TRIGGER button will display and
st"re one reading in the data store. The DATA STORE
indicator light will continue to flash until the defin-
ed buffer size is filled. After the buffer fills, the light
will remain on.
C. If the storage rate is to bc controlled by an external
trigger s"urce ("m-shot mode 000.000 interval
selected), connect the trigger source to the EXTER-
NAL TRIGGER INPUT connector on the rear panel
of the instrument (see paragraph 2.10.1 for trigget
pulse specifications), and press the ENTER button.
The following message will be displayed briefly:
ENTERED
The prompt for a trigger will then be displayed. 'The
following example shows the instrument on the
20VDC range.
VDC
Each subsequent trigger pulse will cause '3 wading
to be stored.
Notes:
1. Whenever numeric data entry is pmmpted for (stwdgc
interval and buffer size), the decimal point button (":')
will clear the display to all z.crocs. This is cspeciallj
useful when selecting the data store one-shot nwde
(000.000).
2. When storing readings with AUTO range enabled, the
display will autorange as usual, but recalled readings
will reflect the range that the instrument was "n when
the data store was cnablcd.
3. Once data st"ragc has started, the data st<,rc' cd" be
disabled by prrssng any function button. .Th,lt functi<ln
will then be selected. Hwvever, if RECAl.I~ is also t'w
abled, the data st"w can only be disabled by pressing
the RESET button first and then '1 function button.
4. The front panel message "Sf IORT-PERIOD" indicates
that the instrument, as currently configured, cannot run
fast enough to store readings at the selected interval. fU)r
example, the instrumrnt caruwt st"w readings '>lt '1
selected interval "f IOmscc if the unit is in the 53 rate
mode (lh.7mscc integration period). In this case, tf,e iw
strument will "nly stwe as fast as it can run
5. Enabling the data st"re does not clear the buffc~ of
previously stored readings. Instead, nen readings ~vill
overwrite "Id readings starting at buffer Iclc.ltit>n (101.
2.7.2 Recalling Data
Stored data may be rccallcd any time during or after the
storage plwcss as foll"ws:
1. Press the RECALL button. The RECALL indicator tvill
turn on and the memory location "f the last stored
wading will be displayed. F"r example, if the last st"wd
reading was in memory location 20, then the f"llowing
message will be displayed:
L0C=020
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