Hellermann Tyton T820 User manual

T820
DIGITAL MULTIMETER
OPERATION MANUAL
Instruments

1. General
The instrument is a pocket digital
multimeter, which is used to measure DCV,
ACV, and DCA, resistance, diode and
continuity test. It is an ideal tool for labs,
household and wireless enthusiasts.
2. Safety Notes
1. Do not input a limit value over the range
when measuring.
2. When measuring voltage higher than
36V DCV, 25V ACV, check the
connection and insulation of the test
leads to avoid electric shock.
3. Keep the test leads away from the testing
point when converting function and range.
4. Don’t add voltage to the input terminal
when measuring resistance.
3. Specification
1. General Features

1-1. Displaying: 22mm digit height LCD
display.
1-2. Max. Indication: 1999 (31/2) auto
polarity indication.
1-3. Sampling rate: approx. 3 times/ sec
1-4. Over Range Indication: MSD displays
"1"
1-5. Low Battery Indication: " "
symbol displays.
1-6. Operation Environment: (0～40)℃,
relative humidity ＜80% .
1-7. Power: 9V battery (NEDA1604/6F22
or equivalent)
1-8. Measurement: 145×85×30mm
(Length×Width×Height)
1-9. Weight: Approx. 170g (including a 9V
battery)
1-10. Accessories: Operation Manual,
Product Certificate, Packing box, Test leads

and a 9V battery.
2. Technical Features
Accuracy: ± (a%×reading+d)
Surrounding: (23±5)℃, relative humidity
＜75%. One year warranty since the date of
manufacture.
2.1 DCV
Range
Accuracy
Resolution
200mV
±
(0.5%+4)
100uV
2V
1mV
20V
10mV
200V
100mV
600V
±
(1.0%+5)
1V
Input impedance: 1MΩfor all ranges.
2.2 ACV
Range
Accuracy
Resolution
200V
±
100mV

600V
(1.2%+10)
1V
Input impedance: 1MΩ.
Frequency Response: (40～200)Hz
2.3 DCA
Range
Accuracy
Resolution
20uA
±
(1.5%+3)
0.01uA
200uA
0.1uA
2mA
1uA
20mA
10uA
200mA
100uA
10A
±
(2.0%+5)
10mA
Max. Input current: 10A (no more than 6
seconds)
Overload Protection: 0.2A/250V;
10A/250V fuse.
2.4 Resistance

Overload Protection: 250V DC/AC peak
value
Note: At range 200Ω, first short-circuit the
meter pens to measure the wire
Range
Accuracy
Resolution
200Ω
±
(0.8%+5)
0.1Ω
2kΩ
±
(0.8%+3)
1Ω
20kΩ
10Ω
200k
Ω
100Ω
20M
Ω
±
(1.0%+15)
10kΩ

resistance. Then subtract it from the
real measurement.
2.5 Diode and continuity test
Range
Display
Testing
Condition
Forward
voltage drop of
diode
Forward
DCA is
approx.
1mA，
Backward
voltage is
apporx.3V
Buzzer makes
a long sound
while
resistance is
less than (70±
20)Ω
Open
voltage is
approx.3V
Overload Protection: 250V DC/AC

peak value
2.6 DC Voltage Measurement
1. Apply the black test lead to "COM"
terminal and the red test lead to “V/Ω”
terminal.
2. Set the knob to a proper DCV range, and
connect the test leads crossly to the
electric circuit under test. LCD displays
polarity and voltage under test connected
by the red test lead.
Note:
1. Firstly, the knob should be set to the
highest range if users have no idea about
the range of voltage under test. Then
select the proper range based on display
value.
2. If MSD displays “1", it means the meter
is over range. Please set the knob to a
higher range.

3. Do not attempt to input voltage over
600V. Otherwise, it may damage the circuit
of the meter.
4. Avoid touching high voltage circuit
when measuring it.
2.7 AC Voltage Measurement
1. Apply the black test lead to "COM"
terminal and the red test lead to “V/Ω”
terminal.
2. Set the knob to a proper ACV range, and
connect the test leads crossly to the electric
circuit under test.
Note:
1. Firstly, the knob should be set to the
highest range if users have no idea about
the range of voltage under test. Then
select the proper range based on display
value.
2. If MSD displays “1", it means the meter

is over range. Please set the knob to a
higher range.
3. Do not attempt to input voltage over
600Vrms. Otherwise, it may damage the
circuit of the meter.
4. Avoid touching high voltage circuit
when measuring it.
2.8 DC Current Measurement
1. Apply the black test lead to "COM"
terminal and the red test lead to “V/Ω”
terminal (max. 200mA), or put the red
test lead to "10A" terminal (max. 10A).
2. Set the knob to a proper DCA range, and
connect the test leads in series to the
electric circuit under test. LCD displays
polarity and current value under test
connected by the red test lead.
Note:
1. Firstly, the knob should be set to the