8

92年8月4日

ES51988

3 3/4 AUTO REL/MAX/MIN

Continuity Check

The continuity check is the same as the 399.9Ω range of the resistance

measurement mode (manual mode). If the bargraph number <=3 ,there will

2.0 KHz signal comes out from BUZOUT pin, if the bargraph number >=4,

there will be no beep exist.

Diode Measurement

Use the DCV 3.999V range of voltage measurement mode (manual mode ).

If the test circuit is open or the device (diode) under test is larger than 2V,

the LCD display will show "OL", but the bargraph will show the real

detected voltage.

Frequency Counter

The timebase of ES51988 is derived by a clock oscillator.

The timebase of counter is :

4,000,000

T

F

osc

Thus , the counter will operate with a 1 second timebase when a

4MHz oscillator is used. For accurate frequency measurement,a

crystal oscillator is recommended. The frequency counter can

automatically or manually select the proper range. Autorange

operation extends over five decades from 1 Hz to 39.99MHz.

Range

Full Scale

FR1

FR2

FR3

FR4

FR5

3.999 KHZ

39.99 KHZ

399.9 KHZ

3.999 MHZ

39.99 MHZ