Uni-Trend UT70D Especificaciones descargar pdf (Pagina 31)

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The current measurement has 2 measurement positions

on the rotary switch: A and mA .

The A has a 8.0000A and 10.000A range, with

autoranging;the mA has a 80.000mA and 800.00mA

range, with auto ranging.

To measure current, connect the Meter as follows:

1. Turn off power to the circuit. Discharge all high-

voltage capacitors.

2. Insert the red test lead into the A or mA terminal

and the black test lead into the COM terminal. Use

the A terminal and A range if the current value to

be tested is an unknown.

3. Set the rotary switch to A or mA .

4. The Meter defaults to DC current measurement

mode. To toggle between DC and AC current

measurement function, press .

5. Break the current path to be tested. Connect the

red test lead to the more positive side of the break

and the black test lead to the more negative side

of the break.

6. Turn on power to the circuit.

The measured value shows on the display.

The AC current value displayed is a True RMS value.

G. Frequency & Duty Cycle Measurement

(see figure 11)

Frequency measurement

The measurement ranges are: 1kHz, 10kHz, 100kHz

and 1MHz. The maximum measurement range is 1MHz.

To measure frequency, connect the Meter as follows:

1. Insert the red test lead into the terminal

and the black test lead into the COM terminal.

2. Set the rotary switch to any measurement position

of V , V , mV , A , mA .

3. Press the Hz button once to display the frequency of

present signal while measure the AC voltage or

current.

4. Connect the test leads across with the object being

measured.

The measured value shows on the display.

Note

Press the Hz button in the MAX/MIN, HOLD mode,

it exits these modes.

Although it is possible to select frequency and duty

cycle

measurement mode at resistance, continuity and

diodes ranges, these functions cannot be used.

It is recommended to use mV range which has

the highest sensitivity.

To obtain a stable reading when measuring input

scope 30V rms frequency signal, set the rotary

switch to V or V .

When frequency measurement has been completed,

disconnect the connection between the testing leads

and the circuit under test, and remove the testing

leads away from the input terminals of the Meter.

The attenuate amplitude of signal is different from

different measuring positions and ranges, therefore

the required input amplitude is different when

measuring frequency at different measuring positions

and ranges.

Duty Cycle Measurement

The duty cycle measurement range is 1% ~ 99%.

To measure duty cycle:

1. Set up the Meter to measure frequency.

2. To select duty cycle, press Hz again (or until the %

symbol is shown on the display).

3. Connect the test leads across the object being

measured.The measured value shows on the display.

Note

Press the Hz button in the MAX/MIN, HOLD mode,

it exits these modes.

The attenuate amplitude of signal is different from

different measuring positions and ranges, therefore

the required input amplitude is different when

measuring frequency at different measuring positions

and ranges.

Although it is possible to select frequency and duty

cycle measurement mode at resistance, continuity

and diodes ranges, these functions cannot be used.

It is recommended to use DCV 8V range.

The polarity of trigger slope is positive.

When duty cycle measurement has been completed,

disconnect the connection between the testing leads

and the circuit under test, and remove the testing

leads away from the input terminals of the Meter.

MAX MIN Recording Mode(1) (see figure 12) MAX MIN Recording Mode(2)

MAX/MIN recording mode applied to all measurement

function except at conductance measurement function.

MAX/MIN recording mode captures and stores the

maximum and minimum input value detected, and

calculates a running average of all readings taken.

In the MAX/MIN mode, when the Meter detects an input

that is below the recorded minimum or above the recorded

maximum, the Meter beeps and records the new minimum

(MIN) or maximum (MAX) value.

In the MAX/MIN mode, you can also display a running

average of al readings taken since the MAX/MIN mode

was activated. Displaying the average reading allows

you to "smooth" a rapidly changing input by displaying

a stable reading on the digital display.

The MAX/MIN mode has a pre-set response time of

100ms. A shorter response time captures shorter events,

but with decreased accuracy. If you want 1 second

response time, that can be selected after power on the

Meter.

To use the MAX/MIN mode as follows:

Enter the

MAX/MIN

mode

Make sure that the Meter is in the desired

measurement function and range.

Press MAX/MIN to enter MAX/MIN recording

mode. The present reading is displayed, and

the Meter is locked in the present range, and

REC is displayed.

Each time a new low or high value is

recorded, the Meter beeps and displays a

new reading.

In MAX/MIN mode, Sleep Mode function

will be disabled

Press HOLD to stop recording, the recorded

values will not erase; Press HOLD again to

resume recording.

To select

response time

The pre-set response time is 100ms.

Press to select 1ms response time in

MAX/MIN mode. In 1ms response time, it

steps through on the sequence of MAX and

MIN only.

At the frequency measurement mode, it

should be 1second response time.

With the rotary switch in the OFF position,

press and hold down MAX/MIN while turning

on the rotary switch to select 1 second high

accuracy response time..

Press MAX/MIN to step through on the

sequence of present readings, high (MAX),

low (MIN) and average (AVG) readings.

To stop and

resume

recording

without erasing

stored value

To view the MAX,

MIN, AVG or

present reading

Press MAX/MIN for over 1 second to exit the

mode. Recorded values are erased and the

Meter stays in the selected range.

To exit the

MAX/MIN mode

Peak Test

PEAK MAX MIN mode is an additional function of .

Pressing to toggle between 100ms response time

and 1ms response time. This function can only be enabled

when the Meter is under MAX/MIN, HOLD mode.

To enter PEAK MAX MIN mode:

Press to enter PEAK MAX MIN mode (1ms

response time), it steps through the sequence of

MAX and MIN reading only.

Press HOLD under 1ms recording mode to stop

recording without erasing stored values. Press

HOLD again to resume recording.

Operation of Hold Mode

The HOLD mode is applicable to all measurement

functions. With the Auto Hold function, it automatically

holds the present reading on the display, freeing you to

concentrate on the placement of the probes when working

in dangerous or difficult situations.

To avoid possibility of electric shock, do not use

HOLD mode to determine if circuits are without power.

The HOLD mode will not capture unstable or noisy

readings.

Press HOLD to enter or exit the HOLD mode:

Press HOLD to enter HOLD mode, the Meter beeps.

Press HOLD again or RANGE or turn the rotary

switch to exit HOLD mode, the Meter beeps.

In HOLD mode, DATA HOLD is displayed on the

LCD.

When measure resistance higher than 12.5MΩ ,

conductance value can be displayed by pressing

HOLD. To switch to resistance value, press HOLD

again.

Conditions to enter Auto Hold Mode:

When input signal is larger than AC/DC 100mV, Auto

Hold mode will be enabled automatically.

When the change of signal three times continuously

within 3 digits, it will hold the last value; the Meter

beeps.

Considers every value as the base value. When the

Meter detects an input which is above the base value

300 digits, the Meter beeps, and holds and displays

the value as the new base value.

Operation of Auto Hold Mode

Auto Hold means you no need to press HOLD, the readings

on the LCD will be hold automatically.

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Uni-Trend UT70D Especificaciones Pagina 31

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