Click <single> to enable the frequency measurement.

Figure 50: Single value measurement

Click on the <single> drop down menu and select the procedure to be performed.

Figure 50 shows the selection: chirp and sine, which indicates that chirp and pure-tone are selected.

Click <go> or press the Enter key to start the actual measurement.

Figure 51: Single value measurement

• Adjustment sliders appear on the screen depending on the selected measuring procedure.
• It is possible to change the measuring parameter by using these adjustment sliders. 
• Figure 51 shows how the sliders are used to change the level of the chirp or pure tone.

During the measurement, the following information appears:

• Small line at the edge of the frequency form (red circle on the left): This is the total level displayed; referred in the status bar as OL. This vale calculated using the RMS procedure.
• Black circle in the i/o diagram (red circle on the right): This is the total level of the output and the input, referred in the status bar as IL and OL. Figure 51 shows OL=90,65 dB and IL=65,54 dB.

Figure 52: drop-down menu

Definitions

• FFT single-channel: Only the measuring channel is evaluated and displayed. Use the single-channel procedure for pure tone measurements only.
• FFT dual-channel: The measuring channel and the reference channel are evaluated. For all other measuring signals (other than pure tones) use the dual-channel measurement.
• Logarithmic Display: Less frequency values are displayed in the higher frequency range.  
• Linear Display: All measured frequencies are displayed.
• Thin curves – thick curves – very thick curves: Refers to the line width of the curves displayed on the screen. Thin curves have a line width of one pixel, thick curves of two pixels and very thick curves of three pixels.
• LiveSurrounding: see text box below
• Smoothing off – light – medium – strong: Smoothes the curves. Two or more adjacent measured values are averaged. Provides curves without or with only a few peaks, which provide a better view but hide the effect of the actual result. 

Figure 53: LiveSurrounding setting

LiveSurrounding:

• Diagram switches to the one shown in Figure 53.
• Red curve: shows the average data of the last 10 measurements
• Blue curve: shows the current measurement
• Uses critical bands for displaying the frequencies.
• This setting is designed for performing analysis of hearing aids while worn.

Figure 54: Save curve

Save Curve:

• Click <save curve now> to save in the ACAM System file.
• After saving the curve, it will appear in the background.

Click on the fields Input1, Input2, and frequency in the status bar for additional drop-down menus.

Figure 55: Input level 1 drop-down menu

Click on the field Input1 to select a different input level (Figure 55).

Figure 56: Input level 2 drop-down menu

Click on the field Input2 to select a different input level (Figure 56).

Figure 57: Frequency 1 drop-down menu

Click on the field Frequency1 to select a different frequency (Figure 57).

Note: menu only active in the 2 tone mode.

Figure 58: Frequency 2 drop-down menu

Click on the field Frequency2 to select a different frequency (Figure 58).

Note: menu only active in pure tone modes.

Figure 59: Display of mA/m for induction measurements

Input level is converted into mA/m for measurements made using an induction coil (select induction in the selection menu).

Figure 59 shows the maximum level of 1 A/m (corresponds to a 100 dB input level).