Tektronix 2230 - Page 38

Controls, Connectors, and lndicators-2230 Operators
A SEC/DIV Switch-Selects the calibrated A
Sweep rates from 0.5 s to 0.05 µs/div in a 1-2-5
sequence of 22 steps for the A Sweep generator
and sets the delay time scale factor for delayed-
sweep operation.
In STORE mode, the A SEC/DIV switch controls
the default Storage, Acquisition, Process, and
Display modes when making acquisitions using
the A Time Base. It also selects the external
clock signal, from the EXT CLK input, for the
storage acquisition circuitry.
B SEC/DIV Switch-Selects the calibrated B
Sweep rates from 50 ms/div to 0.05 µs/div in a
1-2-5 sequence of 19 steps.
In STORE mode, the B SEC/DIV switch controls
the default Storage, Acquisition, Process, and
Display modes when making acquisitions using
the B Horizontal mode.
UNTRIGGERED mode performs acquisitions
without reference to the trigger circuit, and there
is no trigger marker on the screen. Triggers are
ignored in STORE mode at SEC/DIV settings of
5 s per division to 0.1 s per division under the
following conditions:
ROLL is selected. Selecting ROLL forces the
screen to continuously update as on a chart
recorder. Triggers would stop the display.
ROLL is operational at sweep speeds slow
Table 3-2
Default Digital Storage Modes
UN-TRIG
8
TRIGb
SLOW RECORD
5 s to 0.1 s 5 s to 0.1 s
50 ms to 20 11s
or EXT CLK
or EXT CLK
SAMPLEc
OFF OFF OFF
AVERAGEc
OFF OFF
ACCPEAKc
OFF OFF
PEAKDETc
ON ON ON
SMOOTHd
ON
ONe
ON
VECTORS ON ON ON
8
See the "UNTRIGGERED" discussion.
bSee the "TRIGGERED" discussion.
crhese Storage modes are mutually exclusive.
dWorks with ACCPEAK and PEAKDET only.
~Functions with PEAKDET only.
3-6
¢'~:-@
: A BOTH B i 24
...• ,HORIZONTAL M::i---@DE··,
i II I I i
sec 5 '.>~t;ir;r'ive
STOREONLY •~,· .. ·· .. ".·.sr.o.a .. E .. ····.' .. ·.···•.·.
8 OISABLEO '1.:<1:1·>,'
BDELAYog·o·-·-, 21
TIME ,
POSITION
-~
--
4998-06
Figure 3-3. Horizontal controls.
FAST RECORD REPETITIVE
10 µS to 5 µS
2 µS to 0.05 µS
ON
OFF
OFF ON
OFF OFF
OFF OFF
ON
DOTS only