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Questions


Q: How do I make a single sweep recording?

A: In order for the Fluke 190-series to record a single-shot acquisition, the instrument's automatic triggering needs to be inhibited. This is done by making some changes in the trigger menu:

  1. Press the TRIGGER key, then F4 = Trigger Options.
    Within the new menu layer, use the up and down keys to move the cursor to the line "On Edges" and press F4 = Enter.
  2. Within the new menu layer, use the up and down keys to move the cursor to the line "Single Shot" and press F4 = Enter again. The cursor now moves to additional selection fields, usually it will do to press F4 = Enter two more times thereby leaving the menu.
  3. The oscilloscope will now take a single acquisition of the applied signal(s) and freeze the waveform on screen.
  4. Each time that you'll press the purple HOLD/RUN key will initiate a new waveform to be recorded.

Going back from Single Shot mode to the recurrent mode can be as simple as pressing the green AUTO-key once, forcing the instrument to scan the input signal for an appropriate instrument setting. Or, in case you want to leave all other instrument settings unchanged, enter the Trigger menu again and select Trigger options again, now bring the cursor to the first line (Automatic) and press Enter, if the trigger repetition frequency is > 15 Hz you may press Enter once more and see the automatic triggering being activated.

Q: On the 190 series what is the difference between Scope Record and Trend Plot?
A: The TrendPlot feature of the 190-series makes the instrument act as a paperless recorder that will collect a series of parameter measurements over time and will show the result as a graph, a trend-line, on screen. The measurements themselves can either be made using the Multimeter or can be any of the measurements that the oscilloscope can make on the waveform, like risetime- or dutycycle-measurements. The resulting TrendPlot graph will thus show the risetime or the dutycycle as it changes over a longer period of time. This is most useful for instance when studying the change of individual parameters over time or the influence of environmental changes like temperature over time.

The ScopeRecord mode on the other hand is a genuine oscilloscope mode: the applied input voltage is registered over time and the resulting waveform is stored in a long memory record.

In ScopeRecord mode, still the full bandwidth of the oscilloscope applies and so this mode can be used to see amplitude changes of higher frequency signals or to record the voltage of a battery while being charged meanwhile also recording any voltage spikes that may be passed along the supply line when a large current is switched on or off.
Q: On the 190 series when storing measurements into memory what is the difference between Screen + setup and Record + Setup?

A: The 190-series allows for different types of storage:

  • Storage of 15 screens with set-up information, this is screen copies with the information about the instrument settings as they were during recording of the waveform. The latter helps in determining what the actual amplitude speed of the voltages was as.
  • Storage of 2 so-called Replay recordings with set-up information. A Replay record is a set of 100 screen copies successively recorded all having the same settings.

Individual screen copies may each have been acquired using different instrument settings, where as Replay series contains 100 screen copies that all share the same setting. Individual screen copies take up more space in memory than individual screens of the Replay series. As a consequence, when working in ScopeRecord or TrendPlot mode, the instrument can store 15 complete instrument set-up files (when recalled, each one allows for using the instrument again with the very same settings, e.g. volts/division) or can store 2 ScopeRecord files with the associated set-up information.

Q: How do I record?

A: Recording of a ScopeRecord can be started as follows:

  1. Press the RECORDER or ANALYZE key.
  2. Use the UP and DOWN keys to move the cursor to ScopeRecord field.
  3. Press F4 = Enter.

This will initiate the recorder mode. Now the timebase keys (marked "s time ns") may be used to select a recording speed. At the bottom of the trace you'll see an indicator for the total time span the recording will cover as well as an indicator for the amount of time per division. The ScopeRecord mode also allows for the user to see an overview of the total records or zoom in on a smaller section using the 'normal' mode.

Q: How do I download the information?
A: Downloading information from the ScopeMeter test tool is best done using the dedicated program FlukeView ScopeMeter. This program allows for two basic operations to be performed: it can make a direct copy of the complete instrument screen or it can be used to copy the data that comprises an oscilloscope waveform into the PC for further analysis or for storage purposes.
Q: Do I have to use FlukeView to look at recorded waveforms?
A: FlukeView is a very convenient tool to copy complete screen images into a report or to store such screen images for reference purposes.

Waveform files can be displayed using FlukeView, but if the user prefers, he may also copy the waveform data into other application programs - for instance into a spreadsheet program for further analysis or display. An easy way to do so, is by copying the waveform into FlukeView, then copying the data as a CSV-file (Comma Separated Value file) into a spreadsheet.
Q: How long can I record?

A: Using the scope in recorder mode, the total time span of a recording is related to the time resolution of the recording, just like it is with a paper recorder. Thanks to the high sample rate, sudden changes such as glitches will still be captured.

The following table gives an overview of the various settings and resolutions that ScopeRecord offers:

Timebase setting

Recorded timespan

Sample rate

Time Resolution of recording

Will record glitches as narrow as

5 ms/div

6 seconds

20 MS/s

200 µs

50 ns

10 ms/div

12 seconds

20 MS/s

400 µs

50 ns

20 ms/div

24 seconds

20 MS/s

800 µs

50 ns

50 ms/div

60 seconds

20 MS/s

2 ms

50 ns

100 ms/div

2 minutes

20 MS/s

4 ms

50 ns

200 ms/div

4 minutes

20 MS/s

8 ms

50 ns

500 ms/div

12 minutes

20 MS/s

20 ms

50 ns

1 s/div

24 minutes

20 MS/s

40 ms

50 ns

2 s/div

50 minutes

20 MS/s

80 ms

50 ns

5 s/div

2 hours

20 MS/s

200 ms

50 ns

10 s/div

4 hours

20 MS/s

400 ms

50 ns

20 s/div

6 hours

20 MS/s

800 ms

50 ns

1 minute/div

24 hours

20 MS/s

2.4 s

50 ns

2 minute/div

48 hours

4 MS/s

4.8 s

250 ns

        

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