1-5
IM 707235-01E
Functions
1
Sampling Interval
During trigger/gate mode
You can select the sampling interval in the range from 10
µ
s to 10 s (in 1-
µ
s steps).
During free run mode
You can select the sampling interval in the range from 1 ms to 10 s (in 1-
µ
s steps).
Note
You can set the sampling frequency of the time base for the FFT by using the WE Control API
(sold separately, model: 707741). This function is not supported on the WE7000 Control
Software. For details, see the WE Control API User’s Manual (IM707741-61E).
Memory Partition (valid only during the trigger mode)
During the trigger mode, you can divide the acquisition memory into multiple blocks and
acquire the data to the memory blocks in order every time the trigger occurs. You can
divide the memory into 1/2/4/8/16/32/64/128/256 partitions. When using memory
partitions, if the measurement is stopped before reaching the number of acquisitions, the
data in the memory block that was being written at that time are invalid.
Record Length (valid only during trigger/gate (level) mode)
The term “record length” refers to the number of data points acquired in the acquisition
memory. The maximum record length (number of acquired data points) when the
memory is not partitioned is 4 Mwords for 1 channel, 2 Mwords for 2 channels and 1
Mword for 3 or 4 channels.
The range during the trigger mode is “2 to 4 M/the number of memory partitions,” “2 to 2
M/the number of memory partitions,” and “2 to 1 M/the number of memory partitions”
when the number of measurement channels is 1, 2, and 3 or 4, respectively. The record
length is set to “Maximum record length/the number of memory partitions” when 0 is
specified in the trigger mode.
The range during the gate (level) mode is “2 to the maximum record length.” The record
length is set to the “Maximum record length” when 0 is specified in the gate (level) mode.
In this case, the memory is partitioned according to the satisfied and unsatisfied
conditions of the trigger. The maximum number of memory blocks that can be created in
this way is 256.
For the minimum record length, “the record length
×
sampling interval” cannot be less
than 5 ms. When using the internal clock as the time base, the record length is set to the
minimum allowed value when a value below this minimum value is specified. However,
this restriction is not enforced when using the external clock as the time base. In this
case, the value is set to the specified value, but proper measurements may be impeded.
Number of Acquisitions (No. of Acquisitions)
You can specify the number of times to acquire the data when using the trigger or gate
mode. The range is from 1 to 32,768 times. However, if the specified record length is
greater than or equal to “the maximum record length/2,” you can only specify one for the
number of acquisitions.
After acquiring the number of acquisitions of data or if the acquisition is stopped, the
waveform of the measured data is displayed. For example, if you set the number of
acquisitions to 3 in the trigger mode, the module operates as follows.
1
Trigger signal
Acquire data
Display waveform or save data
2
3
1.3 Setting Measurement Conditions