TC818A datasheet(12/24 Pages) MICROCHIP

12 / 24 page

TC818A

DS21475B-page 12

FIGURE 3-6:

MANUAL RANGE

SELECTION CURRENT

MEASUREMENTS

3.10

Extended Resolution Manual

Operation

When operated in the Manual Range mode, the

TC818A extends resolution by 50% for current, volt-

age,

and

resistance

measurements.

Resolution

increases to 3000 counts from 2000 counts. The

extended resolution feature operates only in the

2000k

Ω and 2000V ranges during auto-range

operation.

In the Extended Resolution Operating mode, readings

above 1999 are displayed with a blinking “1” most sig-

nificant digit. The blinking “1” should be interpreted as

the digit 2. The three least significant digits display data

normally. The bar graph LCD will be fully extended.

An input over range condition causes the most signifi-

cant digit (MSD) to blink and sets the three least signif-

icant digits (LSDs) to display “000.” The buzzer output

is enabled for input voltage and current signals with

readings greater than 2000 counts in both manual and

auto-range operations.

For resistance measurements, the buzzer signal does

not indicate an over range condition. The buzzer is

used to indicate continuity. Continuity is defined as a

resistance reading less than 19 counts.

FIGURE 3-7:

MANUAL RANGE

SELECTION VOLTAGE

MEASUREMENTS

Range

Select

IX > 3000

IX > 2000

Display

"1" 000

Over Range

Indicator

"1" = > Flashing

MSD

Yes

Display Last

3 Digits and

Flash MSD

Display

True

Reading

Yes

Output 4kHz

Audio

Frequency

Noncontinuous

Yes

VX > 3000

Yes

Extended

Resolution

Feature

VX > 2000

Range

Select

Output 4kHz

Audio

Frequency

Noncontinuous

Over Range

Indicator

Display

"1" 000

"1" = > Flashing

MSD

Display Last

3 Digits and

Flash MSD

Display

True

Reading

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