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@ ) SAMPLING C L O C K A , B Controls
Select a sampling frequency for the input signal in
16 ranges between 100 ms and 1 jus/word. Between
the 100 ms and 1 jus/word range, the waveform can be
observed during write operation
signal is read out while the input signal is written in
memory.
Between the 50 {is and 1jus/word range, a
trace is displayed during write operation because the
waveform is read out after the write in the memory
(2 K w ) has completed.
Therefore, when a continuous trigger waveform is fed,
the read time cannot be maintained, producing dis-
continued waveform or a trace on the screen, but the
waveform will be stored normally.
condition is present, pull the P U L L D I S P L A Y T I M E
knob 39 to maintain the read time.
When the D I S P L A Y M O D E selector
N O R M , S A M P L I N G C L O C K A corresponds to the
CH1 input signal, and the S A M P L I N G C L O C K B to the
C H 2 input signal. When the D I S P L A Y M O D E selector
is set to D E L A Y , S A M P L I N G C L O C K A and B cor-
respond to the input signal of the main channel select-
ed with the M O D E selector @
tion of that mode selector corresponds to N O R M .
F u l l y clockwise rotation of the S A M P L I N G C L O C K
A control makes a connection to the read only E X T
C L O C K terminals; consequently, the contents of the
memory are read out with the clock signal that is fed
from the E X T C L O C K terminal @
This mode is used only for read operation so that the
instrument is frozen for memory protection, with the
F R E E Z E lamp being on. F u l l y clockwise rotation of
the S A M P L I N G C L O C K B control provides connection
with G P - I B , thereby allowing the reading and writing
of memory contents by connecting the G P - I B control-
ler to the unit. (For details, refer to the description on
G P - I B . )
(32) D I S P L A Y MODE Switches
The MS-1660 operates as a dual-trace oscilloscope by
the push of O S C I L L O and as a memory scope when
R E F R E S H or P R E T R I G is selected.
Combinations of switch settings allow four modes of
writing input signal into memory.
R E F R E S H - N O R M :
A write to memory is started by a trigger
signal or manually by the push of W R I T E /
P E N S T A R T (37) . After 2048 words have
been written, the write operation stops, and
the unit waits in read state for the next trigger
signal or manual start.
R E F R E S H - D E L A Y :
A write to memory is started by a trigger
signal or manually by the push of W R I T E /
P E N S T A R T (37) and continues until 2048
words have been written. T h e data after the
cursor point (delay setting point) are transfer-
red to the other channel: according to the
because the input
When such a
@
is set to
. The D E L A Y posi-
on the rear panel.
(33) 8 D I V / 4 D I V Selector
sampling clock of that channel, these data are
written by
2048 words
allocated to that channel. After
of writing for both channels, the unit waits in
read state for the next trigger signal or manual
start.
T h i s combination provides the same mode as
R E F R E S H - N O R M when M O D E @ ) is set at
D U A L . When M O D E @ ) is at A D D , the data
following the cursor point are written to C H 1
according to the S A M P L I N G C L O C K A .
P R E T R I G - N O R M :
A write to memory is initiated by pressing
W R I T E / P E N S T A R T button @
set by C U R S O R switch
memory's trigger address, and the write opera-
tion continues until the number of
" ( 2 K words) — (words specified by cursor
setting)" have been written after input of
trigger signal. Then the unit waits in road
state until W R I T E / P E N S T A R T @ ) is next
pressed. ( P U L L D I S P L A Y T I M E @ ) must be
O F F . )
This mode permits observation of the
waveform preceding the trigger signal.
When M O D E @
forms the above operation.
its write operation upon completion of C H 1
write operation.
P R E T R I G - D E L A Y :
The channel specified by M O D E
forms the same operation
T R I G - N O R M mode. The data after the cursor
point (delay setting point) are transferred to
the other channel; according to the sampling
clock of that channel, these data are written
by 2 0 4 8 words into the memory allocated to
that channel. After data are written for both
channels, the unit waits in read state for the
next push of the start button.
P L A Y T I M E 6|
must be O F F . )
The M O D E @
forms the same operation
T R I G - N Q R M mode.
memory from the cursor point (i.e., trigger
point for C H 1 ) and stops the write operation
when 2048 words have been written.
Provides a 1/1 and 1/2 output levels of the stored
waveform which is displayed on the screen and taken
at the M E M O R Y O U T jack on the rear panel.
With this button not pressed, the output level will be
1.6 Vp-p (at full input scale). With this button pressed,
the output level will be halved to 0.8 Vp-p (at full
input scale).
The selection does not change the resolution of the
vertical axis.
Therefore, the
waveforms of two
veniently observed by selecting the 4 D I V position.
into the
memory
completion
. The point
(3^) becomes the
words
is set at D U A L , C H 1 per-
C H 2 terminates
(20) per-
as in the P R E
( P U L L D I S -
is set at D U A L , C H 1 per-
as in the P R E
C H 2 starts a write to
events are con-
11
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