FS9721_LP3

Rev. 2.1

13/39

10.3 Located Self-defined Symbol in LCD by the assembly of LCDC1 and LCDC2

LCDC1

LCDC2

Symbol Location

Description

0

0

COM1，SEG14

LCDC1 and LCDC2: Open is “1”; Connect to VSS is

“0”

1

0

COM2，SEG14

0

1

COM3，SEG14

1

1

COM4，SEG14

10.4 The Function of ADPC1 and ADPC2 in ADP Input (ADPC1 and ADPC2: Open is “1”; Connect to VSS is “0”)

ADPC1

ADPC2

DC/AC Status

ADP Max. Input

Voltage

1

1

DC

400mV

1

0

AC

0

1

DC

40mV

0

0

AC

11. Keys Definition

11.1 Range (Auto/Manual Measurement Switch)

Range key is the auto/manual measurement key that acts with trigger. Power-on default is auto

measurement, and press one time to switch to the manual measurement. In manual measurement

mode, the system will jump up one mode for each press until the highest mode, then return to the

lowest mode as a loop. If press the key over 2 seconds, the system will switch back to auto

measurement

status.

Frequency

and

capacitance

measurement

cannot

use

manual

measurement.

11.2 Hold/BLCTR (Reading Hold/Backlight Control)

Hold/BLCTR key is the reading hold /backlight control key that acts with trigger. The function is to

hold the display of reading/backlight control. To press the key, the display value will be locked and

keep unchanged. To press the key again, the locked status will be erased and enter the normal

measurement status. When press and hold the key over 2 seconds, the backlight will be on. In the

backlight on status, press the key over 2 seconds, the backlight will be off.

11.3 Rel (Relative Value Measurement)

Rel key is the relative value measurement key that acts with trigger. Except Hz/Duty, Diode and

Continuity, other functions can do the relative value measurement.

11.4 Select (Function Switch)

Select is the function select key that acts with trigger. Use the key as measuring functions select.

11.5 RS232 (Serial Output Control)

RS232 is the serial output control key that acts with lock. When the key is close, LCD displays

RS232 symbol that means the meter enters the data transmission status, and is able to transfer

the data out; when the key is open, it will exit and the data transmission status will stop.

11.6 Hz/Duty (Frequency/Duty Cycle)

Hz/Duty is the Frequency/Duty Cycle select key that acts with trigger. In frequency measurement

mode, press the key can select frequency or duty cycle measurement mode; in AC/DC voltage or

AC/DC current mode, press the key can proceed to Voltage/Frequency/Duty Cycle or

Current/Frequency/Duty Cycle measurement mode select.

11.7 Reset (Reset key)

Reset is the reset key that acts with trigger. Press the key to make the microprocessor to reset.