FS9721_LP1 datasheet(15/41 Pages) FORTUNE

15 / 41 page

FS9721_LP1

Rev. 2.0

14/41

11. Keys DeTinition

11.1Range (Auto/Manual Measurement Switch)

Range key is the key to switch Auto/Manual Measurement and it acts in activation. The

default is Auto Measurement when power is on. To press one time, the system will switch

to Manual Measurement. In Manual Measurement mode, the system will jump one range

up when the key is pressed one time. If continue to press the key in the top range, the

system will jump to the lowest range, and recircle orderly. If press and hold the key over 2

seconds, the system will switch to Auto Measurement mode. The Hz/Duty Cycle cannot be

measured by Manual Measurement.

11.2Hold (Display Hold)

Hold key is the key to control Display Hold and it acts in activation. The functions are: hold

the display data. When the key is pressed, the display data will be locked and keep

unchanged; if press the key again, the system will be unlocked and enter the normal

measurement mode.

11.3Rel (Relative Value Measurement)

Rel key is the key to measure Relative Value and it acts in activation. All controls can

measure Relative Value except Hz/Duty, Diode and Continuity functions.

11.4BLCTR(Backlight Control)

BLCTR key is the key to control Backlight and it acts in activation. When press and hold

the key over 2 seconds will enable Backlight; press the key again, Backlight will disable.

11.5Select (Function Switch)

Select is the key to select the functions and it acts in activation. Use the key to select the

function to measure.

11.6Hz/Duty(Frequency/Duty Cycle)

Hz/Duty is the key to select Frequency/Duty Cycle and it acts in activation. In Frequency

Measurement Mode, press the key is to select Hz or Duty Measurement; in AC/DC Mode, press

the key is to select Voltage /Hz/Duty or Current/Hz/Duty Measurement Mode.

11.7Reset (Reset Key)

Reset is the key to reset the system and it acts in activation. Press the key is to reset the

microprocessor.

12. OtTer Functions

12.1Auto Power-off

In the process of measurement, if no any action is operated in 30 minutes for function keys

or function switch, the meter will be “Auto Power-Off” (Standby Mode). In Auto Power-Off

status, if the function keys are pressed or the function switch is activated, the meter will be

“Auto Power-On” (Working Mode).

If press and hold Select key to power on, Auto Power-Off function will be disabled.

12.2Buzzer

When press any key or turn any function switch, the buzzer will raise one sound (approx.

0.25 second 〜 1 second). When measuring AC Voltage>750V, DC Voltage>1000V,

AC/DC mA Current>4000μA, AC/DC μA Current >400.0mA, AC/DC Large Current >10A,

the buzzer will keep sounding as the overload warning. Approximate 1 minute before the

system is auto power off, the buzzer will raise constantly 5 sounds to warning. Before the

system is power off, the buzzer will raise 1 long sound to warning.

12.3Backlight

The system has the Backlight driver output function to control the Backlight circuit open

and close so as to provide the convenience of reading the value when in the dim light and

poor vision. When press the BLCTR key over 2 seconds, Backlight will open; when press

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