Actividad, usos y procesos en el puerto

<For a description of this function, see page 1-15>

Relevant Keys

ACTION DELAY

X - Y MENU MENU PHASE

SEARCH HORIZONTAL VERTICAL TRIGGER TRIG D HELP ESC SELECT RESET SIMPLE MODE POSITION MATH MISC FILE CLEAR TRACE HISTORY MEASURE SETUP PRESET DISPLAY CURSOR CH 1 CH 2 CH 3 CH 4 POWER

COPY IMAGE SAVE SHIFT

ZOOM GO/NO-GO ENHANCED ACQ START/STOP SNAP SHOT

V DIV TIME DIV

Operating Procedure

Setting the Acquisition Mode

1. Press ACQ.

2. Press the Mode soft key to display the acquisition mode menu.

3. Press the soft key corresponding to the desired mode from Normal, Envelope, or

Average.

You may not be able to select some modes depending on the record length and sample rate settings.

Setting the Acquisition Count

4. Press the Count soft key.

This is not available when the trigger mode is Single or Single (N).

5. Turn the jog shuttle to set the acquisition count.

You can use the arrow keys to move between the digits. In addition, pressing RESET sets the count to Infinite.

When the acquisition mode is Average and you have selected Infinite, go to step 6.

Setting the Attenuation (When the Acquisition Mode is Average and the Count is Set to Infinite)

6. Press the Weight soft key.

Acquisition and Display

7

Explanation

You can select any of three acquisition modes, as follows. The default selection is Normal.

Normal

The instrument writes sample data into acquisition memory without performing special processing.

Envelope

The instrument finds the maximum and minimum sampled values per interval of 200 MS/s (100 MS/s when the high-resolution mode is ON). It then writes these values into acquisition memory, and generates an “envelope” waveform showing max/min levels for each point.

• Setting Restriction

This mode can be selected in normal mode when the time axis is 100 MS/s or lower (50 MS/s when the high-resolution mode is ON). For all other cases, the acquisition mode is set to normal even if envelope is specified.

Average

The instrument calculates average values and writes these into the acquisition memory If the acquisition count is set to Infinite, the instrument uses exponential averaging, and you are required to set a Weight value. If the count is set to a numerical value (from 2 to 65536), the instrument calculates simple averages using the specified number of readings. An = {(N – 1)A1 n-1 + Xn} N Exponential Averaging(Count=Infinite) AN = N Linear Averaging(Count=2 to 65536) N n = 1Σ X n An Xn N

: Value Obtained after nth Averaging : nth Measured Value : Attenuation Constant (2 to 256, in Steps of 2n) Xn N : nth Measured Value : Number of Averaging Times (Acquisition Count, in Steps of 2n)

Exponential averaging cannot be used when trigger mode is single or single (N). Simple averaging cannot be used with repetitive sampling. The maximum record length is 1 Mword (4 Mwords with the DL1640L) during simple averaging.

For more information about the relationship when roll mode or repetitive sampling mode is active or trigger mode is single or single (N), see Appendix 1.

Acquisition Count

The available count settings are indicated below. If you set the value to Infinite, acquisition will continue until you switch it off with START/STOP.

The default count is Infinite. You cannot change the acquisition count during measurement. The new value is activated when the measurement is stopped. • If Normal or Envelope mode

2 to 65536 (in steps of 1), Infinite • If Average mode

2 to 65536 (in steps of 2n), Infinite

Important Information about the Averaging Mode

• Averaging mode is useful when working with repetitive waveforms.

• Correct averaging is not possible if the waveform has imperfect triggering, since synchronization will be poor and the displayed waveform will be distorted. When working with this type of signal, set the trigger mode to Normal, so that the waveform display is updated only when the trigger occurs. (See section 6.1)

• Roll mode display is disabled during averaging.

• If you stop waveform acquisition by pressing START/STOP, the averaging process also stops. Averaging restarts from the beginning when acquisition resumes. • If you are using simple averaging, the DL1620/DL1640/DL1640L terminates

acquisition automatically when it completes the specified number of acquisitions (as set by the acquisition count).

• During repetitive sampling mode, only the exponential averaging is performed.

Acquisition and Display

7

7.3

Using the Sequential Store Function

<For a description of this function, see page 1-16>

Relevant Keys

ACTION DELAY

X - Y MENU MENU PHASE

SEARCH HORIZONTAL VERTICAL TRIGGER TRIG D HELP ESC SELECT RESET SIMPLE MODE POSITION MATH MISC FILE CLEAR TRACE HISTORY MEASURE SETUP PRESET DISPLAY CURSOR CH 1 CH 2 CH 3 CH 4 POWER

COPY IMAGE SAVE SHIFT

ZOOM GO/NO-GO ENHANCED ACQ START/STOP SNAP SHOT

V DIV TIME DIV

Operating Procedure

Setting the Trigger Mode

1. Press MODE.

2. Press the Single(N) soft key to set the trigger mode to Single(N).

3. Turn the jog shuttle to set the Single(N) Count.

Explanation

By setting the trigger mode to Single(N), the sequential store function can be used.

Acquisition Count

Available numerical settings are as follows. The setting range varies according to the record length. Record Length DL1620/DL1640 DL1640L 1 kword 1 to 4000 (2000) 1 to 16000 (8000) 10 kwords 1 to 500 (250) 1 to 2000 (1000) 100 kwords 1 to 50 (25) 1 to 200 (100) 1 Mword 1 to 4 (2) 1 to 20 (10) 4 Mwords – 1 to 4 (2)

* Values in parentheses above represent the maximum record lengths when the high-resolution mode is ON.

Waveform Display Method

You can recall waveforms from memory in the same way as you do when working with the history function. For details, see section 7.6, “Using the History Memory.”

Restrictions and Precautions

• You can not use this mode together with repetitive sampling or roll mode.

• If you stop waveform acquisition by pressing START/STOP, sequential storage also stops. It then restarts again from the beginning when acquisition resumes.