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Readout

Tabular snapshot of every channel value at the cursor position.

What This Tab Does

The Readout tab displays a numeric table of all analog and digital channel values at the current cursor time. It gives you precise instantaneous samples, peak values, RMS magnitudes, fundamental-frequency phasor magnitudes, and phasor angles — all in one view. This tab requires sign-in.

Unlike the waveform viewer where you read values from chart traces, the readout tab presents exact numbers in a scannable table format. It is especially useful for documenting specific operating points, comparing channel magnitudes, and exporting data for external analysis.

Readout Tab — cursor snapshot

Cursor Readout

Substation Alpha2CSVPNGPDF

Channel	Instant	Pk+	Pk−	RMS	Mag (fund.)	Angle
VA	53.21 kV	93.41 kV	-93.38 kV	66.05 kV	65.98 kV	0.0°
VB	-88.72 kV	93.28 kV	-93.31 kV	65.97 kV	65.91 kV	-120.1°
VC	35.50 kV	93.35 kV	-93.42 kV	66.02 kV	65.95 kV	119.8°
IA	1.842 A	2.615 A	-2.608 A	1.847 A	1.844 A	-28.5°
IB	-0.921 A	2.601 A	-2.597 A	1.839 A	1.836 A	-148.4°
IC	-0.923 A	2.609 A	-2.612 A	1.843 A	1.840 A	91.7°

Digital Channels

TRIP	CB OPEN	ZONE 1	ZONE 2	ZONE 3	START	AR	BF
DEF	STUB	COMM	BLOCK

52024-11-15/14:23:07.142t = 45.300 ms

Header — Tab title with station name from the COMTRADE metadata.

Export buttons — Download the readout as CSV (spreadsheet-ready), PNG (image snapshot), or PDF (printable page).

Analog channels table — One row per analog channel showing instantaneous sample value, positive and negative peaks over the recording, true RMS, fundamental-frequency magnitude, and phasor angle.

Digital channels grid — Compact grid of digital (status) channels. Green dot = asserted (high), dim dot = deasserted (low).

Timestamp bar — Absolute date/time derived from the COMTRADE start time plus the cursor offset, and the relative cursor time in milliseconds.

Time Playback

The playback slider at the top of the tab lets you scrub through the recording without switching back to the waveform tab. Drag the slider thumb to move the cursor to any point in time — all readout values update immediately.

When dual cursors (A/B) are placed on the waveform, the slider shows their positions as draggable blue and orange markers. Below the slider, Jump to buttons let you snap the cursor to the exact position of Cursor A or Cursor B with one click. This is useful for quickly switching between two points of interest — for example, comparing instantaneous values at fault inception (A) and fault clearance (B) without having to locate those points manually each time.

The cursor is automatically placed at the start of the recording when a file is loaded, so the readout table is always populated with data — you never need to click on the waveform first.

Time Playback Slider

123

A4B

545 / 200 ms61x

7Jump to:AB

1Play / Pause — animate through the recording. Phasors, power, harmonics, and readout values update in real time during playback.

2Reset — jump back to the start of the recording.

3Slider track — drag the thumb to scrub to any point in the recording. The filled portion shows current position.

4A/B cursor markers — when dual cursors are placed on the waveform, their positions appear as draggable markers (blue for A, orange for B). Drag a marker to reposition that cursor.

5Time readout — current playback position and total recording duration in milliseconds.

6Speed control — click to cycle through presets (0.5×, 1×, 2×, 4×, 8×). Double-click to type a custom speed. At 1× speed, one power cycle takes one second of wall time.

7Jump to A / B — snap the slider position to cursor A or cursor B. Only visible when both dual cursors are placed.

Analog Channels Table

Each analog channel in the recording gets one row. The columns are:

Column	Description
Instant	The raw sample value at the exact cursor time, interpolated between adjacent samples if the cursor falls between them.
Pk+	The maximum positive peak value observed over the entire recording.
Pk−	The maximum negative peak value observed over the entire recording.
RMS	True RMS computed over one cycle at the cursor time. Includes all harmonics and any DC offset — this is the value a true-RMS meter would show.
Mag (fund.)	Fundamental-frequency RMS magnitude extracted by DFT. Excludes harmonics and DC offset, so it may differ from the true RMS value during distorted conditions.
Angle	Phasor angle of the fundamental-frequency component in degrees. All angles are relative to the reference channel (typically VA or IA).

Digital Channel States

Below the analog table, digital (status) channels are shown in a compact grid. Each channel displays a colored dot: a green dot means the channel is asserted (logic high) at the cursor time, and a dim dot means it is deasserted (logic low). Channels are arranged in rows of eight for readability. This section only appears when the recording contains digital channels.

Timestamp Bar

The bottom of the readout shows the absolute date and time derived from the COMTRADE file's start timestamp plus the cursor offset. The relative cursor time in milliseconds is shown alongside it. This makes it easy to correlate readout values with relay event logs or SCADA timestamps.

Exporting

Three export formats are available via the buttons in the top-right corner:

CSV — Comma-separated file with all analog values (Instant, Pk+, Pk−, RMS, Mag, Angle) plus digital states. Opens directly in Excel or any spreadsheet application. The header includes station name, device ID, and timestamp.
PNG — High-resolution image snapshot of the readout table, suitable for pasting into reports or presentations. Rendered at 2× pixel density for sharp display on high-DPI screens.
PDF — Printable document using the browser's print dialog. Export buttons are automatically hidden from the printed output.

Tips

Drag the playback slider to scrub through the recording and update all readout values in real time. Use the Jump to A/B buttons to snap between two points of interest.
Use the CSV export to bring exact values into a spreadsheet for further comparison or to attach numerical evidence to protection reports.
The readout always shows data at the recording start by default — no need to place a cursor on the waveform first.

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