AEMC PowerPad III 8336 Manual de usuario

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1

Transient Capture on the

AEMC PowerPad III Model 8336

Transients are short-term current and voltage phenomena that occur in the system under

measurement. The process the AEMC PowerPad III Model 8336 uses for recording transients is

as follows:

•The instrument sampling rate is a constant

256 samples per cycle.

•When a transient search is started on the

instrument, each sample is compared to the

corresponding sample from the preceding

cycle.

•The transient threshold is the user-defined

amount of volts or amps for any datapoint to

differ from the corresponding datapoint

exactly 1 cycle earlier. The preceding cycle

defines the mid-point of the trigger envelope

and is used as reference.

•As soon as a sample is outside the envelope,

the triggering event occurs; the transient data

is then captured by the instrument.

•The cycle preceding the event and the three

following cycles are saved to memory.

The following explains how to configure, schedule,

and view a transient recording session on the Model

8336. These instructions assume you are using the

Model 8336 as a standalone instrument.

Note that you can also perform these tasks by connecting the instrument to a computer running

AEMC’s DataView software. For more information, see the PowerPad III Model 8336 User

Guide.

2

Transient Recording Configuration

1. With the instrument turned ON, press the button to display the Waveform Capture

screen.

2. Ensure Transient is highlighted, then press .

●If there are no transient detection sessions stored in the instrument, the Detection

Schedule screen appears.

●If there are recordings in the instrument, the Detection List screen isdisplayed. In this

case, press to display the Detection Schedule screen.

3. Press the function button under the icon to display the Voltage Thresholds

screen. At the top of the screen is the Threshold Set-up field. Options are:

●4V: The same voltage difference threshold applies to all phases and the neutral in the

electrical hook-up

●3V+VN: One threshold applies to the phases and one applies to neutral

●V1+V2+V3+V4: Each phase and neutral has its own assigned threshold

Depending on the electrical hook-up currently under measurement, not all these options

may be available.

4. The setting in this field determines which of the four fields below it (1, 2, 3, and N) are

editable:

●4V: a single field is active for 1, 2, 3, and N.

●3V+VN: one field is active for 1, 2, and 3; and another is active for N.

●V1+V2+V3+N: each field is active.

To edit a voltage threshold field, highlight it using the up and down arrow buttons, then

confirm the selection by pressing . Use the left and right arrows to select a digit, and the

up and down arrows to change it. You can also use these buttons to select units (V or kV).

Press to confirm the edited field.

5. Press the A button to display the Current Thresholds screen. This is similar to the Voltage

Threshold screen. You can select which thresholds apply to which phases, and specify the

value of the threshold (1mA through 9999kA). As with the voltage thresholds, not all these

options may apply to all electrical hook-up types.

Note that current transients typically occur frequently. We recommend performing a current

transient search only when looking for a specific type of transient. At other times, such as when

you are primarily interested in voltage transients, you can effectively disable current transient

searching by setting the threshold to its maximum value.

3

Scheduling Transient Detection

1. Press the button to display the Waveform Capture screen.

2. Ensure Transient is highlighted, then press .

●If there are no transient detection sessions stored in the instrument, the Detection

Schedule screen appears.

●If there are recordings in the instrument, the Detection List screen is displayed. In this

case, press the button to display the Detection Schedule screen.

3. This screen displays four input fields:

●Start defines the time and date when the recording starts. This must be later than the

current date and time.

●Stop specifies when the recording ends. This must be later than the start date and time.

●Transient Count defines the maximum number of transients that you want to capture

before stopping the session.

●Name allows you to name the test. This can be 8 characters long.

4. Use the arrow and buttons to highlight, select, and edit these fields.

5. Press the button to write the settings to the instrument and start the session.

6. If not enough memory is available, an error message appears informing you of this.

Otherwise, the transient detection session will begin at the scheduled start time and date.

If a session is scheduled but not yet started, the message DETECTION ON STANDBY

appears on the screen until the start time is reached, at which point the message changes to

DETECTION IN PROGRESS.

When the session is active, the icon blinks at the top of the screen, along with a status

bar showing the progress of the session. In addition, the (stop) button appears in place

of .

During the session, the Transient Count number is reduced by 1 every time a transient is

recorded. If this number counts down rapidly and appears as though it will reach zero well

before stop time is reached, we recommend stopping the session and setting the threshold

to a higher, less sensitive value. The session will continue until: (1) you press , (2) the

Transient Count limit is reached (see Step 3), or (3) the stop time/date is reached.

7. When the transient detection session is finished, it appears in the Detection List screen. You

can now open the session and view its contents, as explained in the following.

4

Viewing a Transient Detection Session

1. At the Detection Schedule screen, press the button.

For all other displayed screens, press the button, and then select Transient.

Either action displays the Detection List screen.

2. If more than one transient detection recording is stored, use the arrows to select the

desired recording, then press to open it.

In the preceding illustration:

1

Location in the record of the zone

displayed.

4

Move cursor to transient triggering time.

2

Instantaneous value of the signals

according to the position of the cursor on

the scale. Use ◄ and ► to move cursor.

5

Number assigned to displayed graph (e.g.

1 is highlighted indicating channel V1

triggered capture of the transient)

3

Move cursor to one period of the signal

before transient triggering time.

6

Zoom In/Out