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  In the auto range (Auto) mode, the meter selects the best range for the input detected. This allows you

to switch test points without having to reset the range.

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  In the manual range mode you can select the range, this allaws you to override auto range and lock the

meter in a specific range.

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  When the meter in auto range mode the “AUTO” sign will be appear on display screen.

(3) To enter or exit manual range mode ;

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  Press RANGE button momentary the meter enters the manual range mode and “AUTO” turns off.

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  Each press of RANGE momentary increments the range. When the highest range is reached, the

meter wraps to the lowest range.

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  Press RANGE more than 2 seconds the meter returns to auto range mode and “AUTO” appear on

display screen .

3. After setting proceeding measurement.

a. If measuring above limited the secondary display “ 

 ” and primary display present value .

b. If measuring down limited ihe secondary display “ 

 ” and primary display present value .

c. If mcasuring about high and low, secondary display “ 

 ”

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  Analog bar graph

The Function of bar graph is analog needle of meter but without the overload, and updates 40 times per
second because the graph responds 10 times faster than the digital display it is useful for making peak
and null adjustments and abserving rapidly changing inputs. The bar graph has 23 segments. The number
of lit segments is relative to the full-scale value of the selected range. The unit of the bar graph is 4000
counts/bar except when in the relative mode. The polarity indicated at left of the bar graph.

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  Square wave output

The square wave output is a useful function is Iet user have free space for application. For instance,
PWM (Pulse Width Modulation) out, regulate voltage control, timer to control circuit, synchronous clock,
etc, this is a free-for-all application function.

Measurement ranges

A measurement range determines the highest vatue meter can measure. the meter functions have more
than one range.

(1) Being in the right measurement range is important :

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  If the range is too high, the meter will not display the must accurate measurement; If the range is too

low, the meter will show “OL” on the display.

(2) Auto range and manual range ;

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  The meter bas both auto range and manual range options :

How to operate

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  DC Voltage measurement

The measurement of DCV has three modes : DCV / [DCV+ACV] / dBm.
1.

Set the rotary switch to “  V ” position.

2.

Press SELECT to select measurement mode.

3.

Connect the black test lead to “COM” terminal and the red test lead to “V 

V

 Hz” terminal.

4.

For auto range mode the meter at auto range, if you want some range press RANGE to obtain your
range.

5.

According to your need, can press REL

r

 MAX/MIN and 2nd VIEW buttons obtain relevant

measurement .

6.

Touch the probes to the test points and reading display.

7.

Primary and secondary display as Table 5.

Table 5. primary and secondary display

Press

Secondary

SELECT

Primary

[ press 2nd VIEW ]

DCV

DCV

[DCV + ACV ]

ACV

ACV/Hz

dBm

dBm

Hz/ACV/DCV/DCV+ACV

Note : When enter to dBm measurement, the impedance is
600 

V

, if you want change impedance, press RANGE to select

impedance. The impedance selectable is :
4/8/16/32/50/75/93/110/125/135/150/200/250/300/500/600/800/
900/1000/1200 of Ohms.

Figure 5. DCV measurement

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  AC Voltage measurement

The measurement of AC voltage has three modes : ACV / [ACV+Hz] / dBm.
1.

Set the rotary switch to “  V ” position.

2.

Press SELECT to select measurement mode.

3.

Connect the black test lead to “COM” terminal and the red test lead to “V 

V

 Hz” terminal.

4.

For auto range mode the meter at auto range, if you want some range press RANGE to obtain your
range.

5.

According to your need, can press REL

r

 MAX / MIN and 2nd VIEW buttons obtain relevant

measurement.

6.

Touch the probes to the test points and reading display.

7.

Primary and secondary display as Table 6.

Table 6. primary and secondary display

Press

Secondary

SELECT

Primary

[ press 2nd VIEW ]

ACV

ACV

[ACV + Hz ]

ACV

Hz/

%/

%/

ms/

ms

dBm

dBm

Hz/ACV

Note : When enter to dBm measurement, the impedance is
600 

V

, if you want change impedance, press RANGE to select

impedance. The impedance selectable is :
4/8/16/32/50/75/93/110/125/135/150/200/250/300/500/600/800/
900/1000/1200 of Ohms.

Figure 6. ACV measurement

Summary of Contents for 81K

Page 1: ...s as below l Use the meter only as specified in this manual Other wise the protection provided by the meter maybe impaired l Never measure voltage while the test leads are inserted into the current in...

Page 2: ...MIN AVG MAX MIN and Present Reading on secondary display l Press this push button more than 2 seconds meter retum to normal mode l At MAX MIN state the recording time is 36 hours l While SET button op...

Page 3: ...A Second display volt and current unit 21 Hz kHz MHz V kV MV Frequency and Resistance ohms unit second 22 ms ms Duty cycle unit pulse width unit 23 nF mF Capcitance unit 24 mV V mA A Primary display...

Page 4: ...surement range is important l If the range is too high the meter will not display the must accurate measurement If the range is too low the meter will show OL on the display 2 Auto range and manual ra...

Page 5: ...ce the probes in parallel with a circuit or component when the leads are plugged into the current terminals Never test voltage when test lead plug in mA or 10A terminal Warning to wrong operation when...

Page 6: ...r on the display screen If checking point resistance fall below 50 V the beeper will sound l Hi resistance mode At normal mode press SELECT until Hi sign appear on display screen Using this function c...

Page 7: ...al speed measurement l Square Wave Output This meter can output square wave that frequency is selectable by 2nd VIEW 0 5000Hz 1 0000Hz 2 0000Hz 10 000Hz 50 000Hz 60 240Hz 74 63Hz 100 00Hz 151 50Hz 200...

Page 8: ...80 00dBm 1 0 rdg 0 01dBm Table 18 Resistance V Range Resolution Accuracy Note 800V 0 01V 8KV 0 1V Overload protection 80KV 1V 0 3 rdg 10 250V RMS 800kV 10V 8MV 100V 80MV 1kV 2 5 rdg 8 60MV 80MV 3 5 r...

Page 9: ...ads from terminals 3 Loosen the screw on battery case pull up and moce the case 4 Replace the defective battery 5 Reverse the procedure of opening to close the battery case Fuse Replacement Waring To...

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