X-Micro Tech. EVA 310 - Manual (Page 20)

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6.4.3 Setting Contrast
Under the setting mode. Push the or button to adjust the contrast of LCD.
Press the  button to save the selected setting.
6.4.4 Adjusting Backlight
Under the setting mode. Push the  or  button to select the backlight setting,
including: Off, 5s, 10s, on. Press the button to save the selected setting.
6.4.5 Setting Power set
Under the setting mode. Push  or button to select the Power set, including:
2m, 10m, 30m, off. Press the  button to save the selected shutdown time.
6.4.6 Setting Record set
Under the setting mode. Push  or  button to select the recording setting,
including: 8000Hz, 16000Hz, 32000Hz, 48000Hz. Press the  button to
save the select the recording setting.