14.2 External I/O
382
An external signal can be input to set the sampling frequency.
External sampling is possible only when the Memory Function or FFT function is
enabled.
When the Roll Mode is enabled, supported pulse widths are those shown above
for the Model 8958, regardless of input modules.
• When the 8937, 8947, and 8957 are used, the anti-aliasing filter (AAF) is not
available, even if it is set to [On] in the Channel Settings screen
1
Connect the EXT.SMPL terminal and the sampling signal output destination with
a BNC cable.
14.2.3 External Sampling
(EXT.SMPL)
Sampling Input Signals
Voltage range
HIGH level: 3.0 to 5.0 V, LOW level: 0 to 0.8 V
Pulse width
HIGH, LOW level: 50 ns or greater
Response frequency
10 MHz or lower
Maximum input voltage
-2 to 7 V
Sampling signal input
Sample the data of the instru-
ment.
EXT.SMPL
HIGH
3.0 to 5.0 V
EXT SMPL
LOW
0 to 0.8 V
49.9
150 pF
5 V
GND
t
t
L
t
H
t
H
> 50 ns
t
L
> 50 ns
t
> 100 ns
10 k
5 V
• Normal operation is not possible when the pulse width is below that shown in
the following table.
Supported external sampling pulse widths
Setting
(EXT.SMPL)
Pulse width
When 8958 is used
When other input module is used
t
H
t
L
t
t
H
t
L
t
> 5
s
> 5
s
> 10
s
> 50 ns
> 50 ns
> 100 ns
> 5
s
> 5
s
> 10
s
> 50 ns
> 50 ns
> 100 ns
&
> 10
s
> 10
s
> 20
s
> 90 ns
> 110 ns
> 200 ns
Signal Input Procedure
Summary of Contents for 8860-50
Page 2: ......
Page 12: ...Contents x...
Page 18: ...Reading this Manual 6...
Page 24: ...1 3 Interconnection and Block Diagrams 12...
Page 180: ...6 12 Making Trigger Settings on the Waveform Screen 168...
Page 246: ...8 15 Inserting and Searching for Event Marks on a Waveform 234...
Page 356: ...12 7 Print Examples 344 A B Waveform_________________________________________________...
Page 406: ...14 2 External I O 394...
Page 489: ......
Page 490: ......