# Measuring rounds

During a Station setup plus or Resection, or when using the Measure rounds measurement method, you can measure multiple sets (rounds) of observations.

A round is a set of either:

- single face 1 observations
- matched face 1 and face 2 observations

Rounds can be used in a number of different ways depending on your equipment, the accessibility of points, and the procedures to observe the points, such as the order in which the observations are made.

Building a rounds list

The rounds list contains the points used in the rounds observations.

The software automatically builds the rounds list as each point is added to a Station setup plus or Resection, or as you measure each point for the first time when using the Measure rounds measurement method.

The rounds list contains information about each point including point name, code, target height, prism constant, and target ID. You cannot alter the prism constant or the target height for subsequent rounds.

Because the Trimble Access software uses the target height and prism constant values stored when building the rounds list, you must enter the correct target height and prism constant as each point is added to the rounds list.

The maximum number of points in the rounds list when:

- Using the Measure rounds measurement method is 200
- During Station setup plus or Resection is 25.

To complete the rounds list, tap End face.

You cannot edit the rounds list. Before you tap End face, be sure to observe all points to include in the rounds observations.

Including/excluding the backsight from a set of rounds

Trimble recommends observing the backsight on both faces if you are taking foresight observations on both faces. If you exclude the backsight:

- The backsight observation(s) taken during the station setup is used to compute the MTA.
- if you do not measure the backsight on face 2 and there is only one single face observation to the backsight, and the rounds include observations on both faces, then the horizontal angle face 2 measurements observed using Measure rounds will not be used when calculating the MTAs.