MICRONIX

Operation and Examples of Trigger Function

MSA500 series Signal Analyzer offers strong trigger functions on real-time mode.
On this document, the way to operate and some examp les are introduced.

1.Trigger Source Selection

At first the trigger source described below should be selected when the trigger function is used.

Free Run: The waveform is updated without any condition.
IF Level Trigger condition is defined as the ratio between the instantaneous signal level and the full scale of IF signal path.
If the signal level exceeds the trigger level, the waveform is updated.
Power Trigger condition is defined as t he total power within the span. Trigger level is described as the relative value ag ainst the reference level. When the trigger slope is set to “RISE”, if the sig nal power exceeds the trigger level, the waveform is updated.
When the trigger slope is set to “FALL”, if the sign al power is lower than the trigger level, the waveform is updated.
Channel Power Trigger condition is defined as the total power within the channel. The span is divided into 5 then each piece is defined as the channel.
Trigger level is described as the relative value against the reference level.
The trigger slope setting works as same as Power trigger.
External Trigger condition is defined as the external trigger input voltage. When the trigger slope is set to “RISE”, if the inp ut level exceeds the fixed threshold (0.56V), the waveform is updated.
When the trigger slope is set to “FALL”, if the input level is lower than the fixed threshold(0.56V), the waveform is updated.

The comparison table is shown in below. Please refer to the table at section 7 for the sample time.

Scroll
Trigger Source Time Resolution Slope Level Range
IF Lever 14.7ns RISE only 1 to 100 %(1% Step)
Power 1sample RISE/FALL -40 to 0 dB(1dBStep)
Channel Power 5sample RISE/FALL -40 to 0 dB(1dBStep)
External 14.7ns RISE/FALL 0.56V Fixed

2.Pre-Trigger Setting

Pre-Trigger defines how many data is captured before the trigger event.

It is available to choose 0/25/50/75/100%.

プリトリガの設定

3.Trigger Slope Setting

This is the choice of the trigger slope “RISE” or “ FALL”. Please refer to “1” for the operation.

4.Scan Setting

This is the choice of the waveform update is one ti me (Single) or repeatable (Continuous).

5.Trigger Level Setting

IF Level Set as the ratio against the ful l-scale. 1 to 100% at 1% step.
Power Set as the relative value against the ref erence level. 0 to –40dB at 1dB step.
Channel Power Set as the relative value against the reference level.
0 to –40 dB at 1 dB step.

6.Trigger Channel Setting

Channnel Power Choice of the one of 5 channels to be used as the trigger source.
1 is the lowest frequency, 3 is the center and 5 is the highest frequency.
Trigger Channel Setting

7.Acquisition Frame Setting

It sets the acquisition length as the frame count.

The setting menu is available with pressing ”OPERATION MODE” button.

Press “ACQ FRAME” (F3) then set the frame count by the encoder.

”ENC STEP”(F6) offers the step size setting of the encoder.

1frame consists of 1024 sample on time domain.

Sample/Frame time and maximum acquisition time depe nds on the span setting as follows.

Span Sample Time Frame Time Maximum Acquisition Time
20MHz 29.4ns 30.1us 0.4935s
10MHz 58.8ns 60.2us 0.9869s
5MHz 118ns 121us 1.973s
2MHz 294ns 301us 4.935s
1MHz 588ns 602us 9.869s
500kHz 1.18us 1.21ms 19.73s
200kHz 2.94us 3.01ms 49.35s
100kHz 5.88us 6.02ms 98.69s
50kHz 11.8us 12.1ms 197.3s
20kHz 29.4us 30.1ms 493.5s

8.Main Analysis Setting

Main Analysis can be set on the menu of ”ANALYSIS M AIN”(F1) under “OPERATION MODE” key.

Spectrum Spectrum Analysis is set. Analysis frame count is fixed to 1.
Spectrogram Spectrogram Analysis is set.
Overwrite Overwrite Analysis is set.
Trigger source is fi xed to Free Run.
Time Domain Time Domain Analysis is set. Further selection is sh own in below.
  • Power vs. Time:Y axis is set to Power [dBm]
  • Phase vs. Time:Y axis is set to Phase [degree]
  • Frequency vs. Time: Y axis is set to Frequency [Hz] IQ vs.
  • Time: Y axis is set to I/Q voltage [V]
  • Q vs. I: Y axis is set to Q voltage and X axis is set to I voltage. It is polar display.

9.Sub Analysis Setting

Sub Analysis can be set on the menu of ”ANALYSIS SUB”(F2) under “OPERATION MODE” key.

10.Start of Acquisition

Press “HOLD/RUN” to start. Press “HOLD/RUN” again to stop.

Example

  1. Intermittent Spectrum Capturing

    At this example, MSA500 captures the intermittent signal generated by the transmitter

    [Setting Procedure]

    1. On Real-time mode, Center Frequency, Span and Reference Level is set as desired.
    2. Press “TRIG” - ”TRIG SRC SELECT”[F1] - ”IF LEVEL”[F4] then set IF LEVEL to 5%
    3. Press “RETURN”[F6] – “SCAN”[F4] then set to ”CONTINUE ”
    4. Press “OPERATION MODE” – “ANALYSIS MAIN”[F1] then select ”SPECTRUM
    5. Press “RETURN”[F6] – “ANALYSIS SUB”[F2] then select ”OFF”[F3]
    6. Press “CALC” – “MAX HOLD”[F2] the set hold count to ” **”
    7. Press “HOLD/RUN” to start acquisition
    8. When the signal is captured, Press ”HOLD/RUN” to stop the acquisition
    9. Graph:Intermittent Spectrum Capturing
  2. ASK signal analysis generated by ETC road side unit

    We analyze ASK signal with split phase coding on this example.

    [Setting Procedure]

    1. On Real-time mode, Center Frequency, Span and Refere nce Level is set as desired.
    2. Press “TRIG” - ”TRIG SRC SELECT”[F1] - ”POWER”[F2] then set POWER to -35dB
    3. Press “RETURN”[F6] – “SLOPE”[F3] RISE, “SCAN”[F4] then set to ”SINGLE”
    4. Press “OPERATION MODE” – “ANALYSIS MAIN”[F1] - ”T DOM AIN”[F4] – “POWER-T”[F1]
    5. Press “RETURN”[F6] – “ANALYSIS SUB”[F2] - ”SPECTROGM” [F2]
    6. Press “RETURN”[F6] – “ACQ FRAME”[F3] then set to 500
    7. Press “HOLD/RUN” to start acquisition
    8. When acquisition is completed, adjust ”STT FRAME”[F4], and “ANL FRAME”[F5] to set the analysis window for Main analysis.
    9. Graph:ASK signal analysis generated by ETC road side unit
  3. Transmit time measurement of Smartmeter signal

    We measure the transmit time of the GFSK signal generated by Smartmeter.

    By the measurement below,
    • Frame time:301[us] @2M span
    • Transmit Frame count:754
    • Transmit Time:0.301 x 754 = 226.9 [ms]
    [Setting Procedure]
    1. On Real-time mode, Center Frequency, Span and Refere nce Level is set as desired.
    2. Press “TRIG” - ”TRIG SRC SELECT”[F1] - ”POWER”[F2] then set POWER to -35dB
    3. Press “RETURN”[F6] – “PRE TRIG”[F2] 0% , “SLOPE”[F3] “RIS E”, “SCAN”[F4] to ”SINGLE”
    4. Press “OPERATION MODE” – “ANALYSIS MAIN”[F1] - ”T DOM AIN”[F4] – “POWER-T”[F1]
    5. Press “RETURN”[F6] – “ANALYSIS SUB”[F2] - ”SPECTROGM” [F2]
    6. Press “RETURN”[F6] – “ACQ FRAME”[F3] then set to 2000
    7. Press “HOLD/RUN” to start acquisition
    8. When acquisition is completed, adjust ”STT FRAME”[F4], and “ANL FRAME”[F5] to set the analysis window for Main analysis.
    9. Graph:ASK signal analysis generated by ETC road side unit

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