ES51961

3 3/4 MANU DMM

2006/1/24

5

Pin Symbol

Type Description

77 BUZIN

I

Buzzer control input. When connected to V-, turns the buzzer on. (2.5

KHz continuity signal)

78 OSC2

O Crystal oscillator (output) connection.

79 OSC1

I

Crystal oscillator (input) connection.

80 XTAL

I

When unconnected or connected to DGND, the oscillator frequency is

generated by external crystal. When connected to V-, the frequency is

decided by internal RC oscillator.

81 RESET

I

Pulse low to clear the push function and counter.

82 FC1

I

Switch 1 for function selection.

83 FC2

I

Switch 2 for function selection.

84 FC3

I

Switch 3 for function selection.

85 M2

I

When connected to V-, the integration full voltage will be 200mV

instead of 400mV.

86 M10

I

When connected to V-,the integration full voltage will be 40mV

instead of 400mV.

87 D10

I

When connected to V-, the integration full voltage will be 4V instead

of 400mV, and the absolute value of input voltage must

≤2V.

88 ZOOM

I

Zoom function select and Logic function setting (buzzer on state).

89 PEAK

I

Peak hold control pin, pulse low can make this function active.

90 REL

I

Relative control pin. Pulse low to make this function active.

91 MAX/MIN

I

Pulse low to make this function active.

92 HOLD

I

Pulse low to make this function active.

93 BKOUT

O If BKLIT pin is pushed, this pin output will change from V- to V+ for

60 sec then returned to V- again, the driving current is about 1 mA.

94 SDO

O RS232 output pin.

95 C+

O Positive capacitor connection for on-chip DC-DC converter.

96 C-

O Negative capacitor connection for on-chip DC-DC converter.

97 LBAT9

I

Low battery voltage setting. If used 3V battery, connected this pin to

AGND, the default low battery voltage will be -2.3V. For 9V battery

power, if this pin input is smaller than V12 (-1.2V), the LCD

annunciator “BATT” will be displayed.

98 V-

P Negative supply voltage. Connecting to battery negative terminal.

99 V-

P Negative supply voltage. Connecting to battery negative terminal.

100 DGND

G Digital ground, connected to battery positive terminal.

*Type: I=Input, O=Output, P=Power, G=Ground