Defining a meter chart
A meter chart shows a data value as a needle that marks a position on a dial. You can create a chart that shows one or more needles on one dial or one that shows multiple dials, each displaying one needle. It is not possible to use multiple needles on multiple dials.
Figure 16‑35 shows two sample meter charts.
Figure 16‑35 Meter charts using one and two meters
The meter value series specifies the needle value. The chosen expression determines where on the dial the needle appears. To show multiple needles or meters, use either multiple meter value series expressions or Optional Grouping.
A category definition is not essential to a meter chart. You must, however, provide an expression in the Category Definition field. You can type a space that is enclosed by quotation marks in this field to satisfy this requirement. The chart selects the first row returned by the meter value definition and uses the data from that row in the chart.
