The User Interfaces for 6-second and 10-second 3 lead telemetry strips are shown below. The interface consists of a single Analysis Window that you will use to interact with the ECG using calipers.

As mentioned above, calipers are available in the Analysis Window for you to use to measure intervals and amplitudes in the ECG. Two caliper modes are available, a timing caliper and a voltage caliper. The active caliper mode is shown in the lower right and region of the Analysis Window. The time caliper is activated by default.

The Time Caliper mode is activated by pressing the 'T' key while the mouse is in the Analysis Window. When you press the 'T' key, notice that the Caliper Mode indicator in the lower right corner of the Analysis Window updates, and the cursor in the Analysis Window changes to a caliper, as you see in the following image. Pressing the 'T' key again will turn off the Timing Caliper.

To use the Timing Caliper, move the left arm of the caliper cursor to the desired start location. Press and hold the left mouse button and move the mouse left or right to begin measuring. A Time Caliper Measurement consisting of two lines and a measurement box will appear on the ECG as you move the mouse. When you reach the desired end location, release the left mouse button. The Time Caliper Measurement will remain on the ECG.

If a Time Caliper Measurement is present on the ECG and you want to measure a different region, repeat the steps for creating a new Time Caliper Measurement with a starting position outside the current Time Caliper Measurement.

After creating a Time Caliper Measurement, you can adjust the start and stop locations by moving the measurement lines. Place the mouse cursor over one of the measurement lines. The mouse cursor will change to indicating the measurement location can be changed. Then press and hold the left mouse button and move the mouse left or right to set a new location. When at the desired new location, release the left mouse button. The updated Time Caliper Measurement will remain on the ECG. You can adjust the Time Caliper using the keyboard.

You can move a Time Caliper Measurement around the ECG in the Analysis Window. For example, if you want to check if the RR interval between the third and fourth normal QRS complexes in the image below is the same as the first RR interval, you can move the Time Caliper Measurement by placing the mouse cursor between the two measurement lines. The mouse cursor will change to to indicate you can move the measurement. Then click and hold the left mouse button and then move the mouse to the desired new location. You can also move the Time Caliper using the keyboard.

To clear a Time Caliper Measurement, you can

1. Click the mouse on the ECG in the Analysis Window outside of the Time Caliper Measurement
2. Toggle the caliper mode off and then on again by pressing the 'T' key twice
3. Pressing the 'Escape' key

The Voltage Caliper mode is activated by pressing the 'V' key while the mouse is in the Analysis Window. When you press the 'V' key, notice that the Caliper Mode indicator in the lower right corner of the Analysis Window updates, and the cursor in the Analysis Window changes to a caliper, as seen in the following image. Pressing the 'V' key again will turn off the Timing Caliper.

To use the Voltage Caliper, move the top arm of the caliper cursor to the desired start location. Press and hold the left mouse button and move the mouse up or down to begin measuring. A Voltage Caliper Measurement consisting of two caliper lines and a measurement box will appear on the ECG as you move the mouse. When you reach the desired end location, release the left mouse button. The Voltage Caliper Measurement will remain on the ECG.

If a Voltage Caliper Measurement is present on the ECG and you want to measure a different region, repeat the steps for creating a measurement region with a starting position outside the current Voltage Caliper Measurement.

After creating a Voltage Caliper Measurement, you can adjust the start and stop locations by moving the measurement lines. Place the mouse cursor over one of the measurement lines. The mouse cursor will change to indicating the measurement location can be changed. Then press and hold the left mouse button and move the mouse up or down to set a new location. When at the desired new location, release the left mouse button. The updated Voltage Caliper Measurement will remain on the ECG. You can adjust the Voltage Caliper using the keyboard.

You can move a Voltage Caliper Measurement around the ECG in the Analysis Window to check for consistent voltage measurements across the ECG. First, place the mouse cursor between the two measurement lines to move the Voltage Caliper Measurement. The mouse cursor will change to to indicate you can move the measurement. Then click and hold the left mouse button and then move the mouse up or down to the desired new location. You can also move the Voltage Caliper using the keyboard.

To clear a Voltage Caliper Measurement, you can

1. Click the mouse on the ECG in the Analysis Window outside of Voltage Caliper Measurement
2. Toggle the caliper mode off and then on again by pressing the 'V' key twice
3. Pressing the 'Escape' key