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ELECTRICITY
MEASURING METER DT-830B
GENERAL
M83
instruments are a series of compact pocket-sized 3 1/2digit
multi-meters for measuring DC and AC voltages, DC current,
resistance and diode. Some also provide temperature; transistor
measurement and audible continuity test function or can be
used as a signal generator. Full range overload protection
and low battery voltage indicator are also provided. They
are ideal instruments for use in the fields, such as in laboratories,
workshops, as well as for hobbies and home applications.
FRONT PANEL DESCRIPTION
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1.
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FUNCTION AND RANGE SWITCH
This
switch is used to select the function and desired
range as well as to turn on the instrument.
To
extend the life of the life of this battery, the switch
should be in the "OFF" position when the
instrument is not being used.
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|
2.
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DISPLAY
3 1/2 digit, 7 segment, 0.5"
high LCD. |
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3.
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"Common" JACK
Plug in connector for black (negative) test lead.
|
|
4.
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"V-Ohm mA Cx" JACK
Plug in connector for red (Positive) test lead for
10A measurement. |
SPECIFICATION
Accuracy are guaranteed for 1 year, 23°C
± 5°C, less than 75 % RH
DC
VOLTAGE
| RANGE |
RESOLUTION |
ACCURACY |
| |
|
|
| 200mV |
0.1mv |
±
0.25% of rdg ± 2D |
| 200mV |
1mv |
±
0.5% of rdg ± 2D |
| 20V |
10mv |
±
0.5% of rdg ± 2D |
| 200V |
100mv |
±
0.5% of rdg ± 2D |
| 1000V |
1v |
±
0.5% of rdg ± 2D |
OVERLOAD PROTECTION: 220 V rms AC for 200mV range and 1000V
DC or 750 Vrms AC for other ranges.
AC
VOLTAGE
| RANGE |
RESOLUTION |
ACCURACY |
| |
|
|
| 200V |
100mv |
±
1.2% of rdg ± 10D |
| 750V |
1v |
±
1.2% of rdg ± 10D |
OVERLOAD PROTECTION: 1000V DC or 750 Vrms for all ranges.
RESPONSE: Average responding, calidrated in rms of a sine
waye.
FREQYENCY
RANGE: 45Hz-450Hz
DC
CURRENT
| RANGE |
RESOLUTION |
ACCURACY |
| |
|
|
| 0.2mA
|
100nA |
±
1% of rdg ± 2D |
| 2mA |
1000nA |
±
1% of rdg ± 2D |
| 20mA |
0.01mA |
±
1% of rdg ± 2D |
| 200mA |
100mA |
±
1.2% of rdg ± 2D |
| 10A |
10mA |
±
2% of rdg ± 2D |
OVERLOAD PROTECTION: 200mA 250V fuse (10A range unfazed.)
MEASURING VOLTAGE DROP: 200Mv
RESISTANCE
| RANGE |
RESOLUTION |
ACCURACY |
| |
|
|
| 200
ohm |
100m
ohm |
±
0.8% of rdg ± 2D |
| 2k
ohm |
1
ohm |
±
0.8% of rdg ± 2D |
| 20k
ohm |
10
ohm |
±
0.8% of rdg ± 2D |
| 200k
ohm |
100
ohm |
±
0.8% of rdg ± 2D |
| 2000k
ohm |
1k
ohm |
±
1% of rdg ± 2D |
MAXIMUM OPEN CIRCUIT VOLTAGE: 2.8v.
OVERLOAD PROTECTION: 15 seconds maximum 220 Vrms. Sounds alarm.
AUDIBLE CONTINUITY
·))) built- in buzzer sounds if resistance is
less then 100 ohm
OVERLOAD PROTECTION: 15 seconds
maximum 220 Vrms. Sounds alarm.
TEMPERATURE
(K TYPE PROBE)
| RANGE |
RESOLUTION |
ACCURACY |
| |
|
|
| -20°C
to 1370°C |
1°C
|
±
3 ± 2D (up to 150°C)
± 3 of rdg (over 150°C) |
OVERLOAD
PROTECTION: 220vrms AC.
OPERATING
INSTRUCTIONS
WARNING
|
1.
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To avoid electrical shock hazard and/or damage of the
instrument, do not measure voltage that might exceed
500V above earth ground. |
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2.
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Before
the use of the instrument, inspect test leads, connectors
and probes for cracks, breaks, or crazes in the insulation. |
DC
VOLTAGE MEASUREMENT
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1.
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Connect red test lead to "V W mA" jack; black
lead to "COM" jack. |
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2.
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Set RANGE switch to desired DCV position, If the voltage
to be measured is not known beforehand, set switch to
the highest range and reduce it until satisfactory reading
is obtained. |
|
3.
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Connect test lead to device or circuit being measured. |
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4.
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Turn on power of the device or circuit being measured,
voltagevalue on Digital Display along with the voltage
polarity. |
AC
VOLTAGE MEASUREMENT
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1.
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Red lead to "V Ohm mA" Black lead to "COM" |
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2.
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RANGE switch to desired ACV position. |
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3.
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Connect test leads to device or circuit being tested. |
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4.
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Read voltage value on Digital Display. |
DC
CURRENT MEASUREMENT
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1.
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Red lead to "V W mA." Block lead to "COM"
(For measurements between 200mA and 10A connect red
lead to "10A" jack with fully depressed.) |
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2.
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RANGE switch to desired DCA position. |
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3.
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Open the circuit to be measured, and connect test leads. |
RESISTANCE
MEASUREMENT
|
1.
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Red lead to "V Ohm mA." Black lead to "COM." |
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2.
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RANGE switch to desired Ohm position. |
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3.
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If the resistance being measured is connected to a circuit,
turn off power and discharge all capacitors before,
measurement. |
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4.
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Connect test leads to circuit being measured. |
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5.
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Read resistance value on Digital Display. |
DIODE
MEASUREMENT
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1.
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Red lead to "V Ohm mA." Black lead to "COM." |
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2.
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RANGE switch to Ohm position. |
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3.
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Connect the red test lead to the anode of the diode
to be measured and black test to cathode. |
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4.
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The forward voltage drop in mV will be displayed. If
the diode is reversed, figure "1" will be
shown. |
TRANSISTOR
hFE MEASUREMENT
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1.
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RANGE switch to the hFE position |
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2.
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Determine whether the transistor is NPN of PNP type
and locate the Emitter, Base and Collector leads. Insert
the leads into the proper holes of the the hFE Socket
on the front panel |
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3.
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The meter will display the approximate hFE. Value at
the condition of base current 10mA and VCE 2.8C |
TEMPERATURE
MEASUREMENT
|
1.
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Connect the k type thermoelectric couple to "V
Ohm mA" and "COM" jacks. |
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2.
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RANGE switch to TEMP position. |
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3.
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The display will read Temperature value °C |
ROOM
TEMPERATURE MEASUREMENT
M835
can be used to measure room temperature (0°C to 35 °C)
without a thermoelectric couple. Simply set the RANGE switch
to RT position and the current room temperature will be displayed.
CAPACITANCE
MEASUREMENT
|
1.
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Set the FUNCTION switch to the F range to be used. |
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2.
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Connect the test capacitor to the "V Ohm mA cx"
jack and the "COM" jack. |
AUDIBLE
CONTINUITY TEST
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1.
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Red lead to "V Ohm mA." Black lead to "COM" |
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2.
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RANGE switch to position. |
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3.
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Connect test leads to two points of circuit to be tested.
If the resistance is lower than 100 ohm, buzzer will
sound. |
TEST
SIGNAL USE
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1.
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RANGE switch to position. |
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2.
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A test signal (50Hz for M832 M835 M837 8301 and1000Hz
for m833) appears between to "V Ohm mA" and
"COM" jack. The output voltage is approximate
5V p-p with 50 k ohm impedance. |
BATTERY AND FUSE REPLACEMENT
Fuse
rarely needs replacement and blows almost always as a result
of operator's error.
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