2
Ω
. The measurement range for HDT20B is 10M
Ω～
19.99G
Ω
.
2.11 Convenient operating and taking.
2.12 Strong carrying capability, output short circuit current is >
1.0 mA.
2.13 Complete protecting circuitry, in case of voltage
counterattack and output short circuit protection.
2.14 Can test AC Voltage 1V-750V, the frequency of AC
Voltage is 40Hz-400Hz.
2.15 International fashion design, dustproof and dampproof,
can be applied to outside operation.
3.Technic specifications
Test condition: test temperature/humidity 23
±
5
℃
/
45
～
75
％
RH;
Low battery voltage indication;
Insulation resistance:
≥
500M
Ω
(1000V);
Voltage withstand:AC 2KV 50Hz 1minute;
Operation temperature and humidity:0
℃
~40
℃
/Relative
humidity 85% or less;
This manual is just applied to this instrument, our company is
entitled to modify it.
HDT20A
technic specifications
Basic Function
Range
Accuracy
Output Voltage
250V/500V/1000V
±
10%
Output Current
250V(R=250k
Ω
)1mA
±
10%
500V(R=500k
Ω
)1mA
1000V(R=1M
Ω
)1mA
200M
Ω
250V:0.1M
Ω
-20M
Ω
±（
4%
±
2
）
500V:0.1M
Ω
-50M
Ω
1000V:0.1M
Ω
-100M
Ω
2000M
Ω
250V:20M
Ω
-500M
Ω
±（
4%
±
2
）
500V:50M
Ω
-1000M
Ω
1000V:100M
Ω
-2000M
Ω
Short circuit
current
≤
1.8mA
central value
resistance
250V/500V:2M
Ω
1000V:5M
Ω
ACV
750V
±（
1%+6
）
AC750V input impedance
：
1M
Ω。
AC750V frequency response
：（
50
～
200
）
Hz
The median resistance value : Ensure measuring voltage on both
ends of less than 90% of the nominal value test voltage under
the resistance measurement of threshold
HDT20B
technic specifications
Basic Function
Range
Accuracy
Output Voltage
500V/1000V/2500V
±
10%
Output Current
≥
100M
Ω
Short circuit
current
＞
1.0mA
2G
Ω
500V:.010G
Ω
-1.999G
Ω
±
10%
1000V:.010G
Ω
-1.999G
Ω
2500V:.010G
Ω
-1.999G
Ω
20G
Ω
500V:0.01G
Ω
-19.99G
Ω
±
10%
1000V:0.01G
Ω
-19.99G
Ω
2500V:0.01G
Ω
-19.99G
Ω
ACV
750V
±（
0.1% +6
）
AC750V input impedance
：
1M
Ω。
AC750V frequency response
：（
50
～
200
）
Hz
4.Appearance
1. Line terminal L
2. Shield terminal G, the end terminal of ACV measurement
3. The positive terminal of the ACV measurement
4. Earth terminal E
5. Backlight button
6. Range switch button
7. High-volt startup button
8.
External power jack
9. Instrument belt hole
10. High voltage indicator
11. Rotary switch
12. Power button
13. 3 1/2 digit display screen
5.Safety notice
5.1 Before use, please read the manual carefully, and comply to
its step, operating accordingly.
5.2 Please don't use the accessories not being supplied by the
original company in case of danger.
5.3 While measuring, the terminal E
、
L has DC high voltage
output, non-human contact in case of electric shock.
5.4 In order to avoid the error resulted by the insulation
leakiness of the test stick, the test stick connected to the terminal L
is supposed to hang in the air as possible as it could, can't touch
with the outside object.
5.5 When the insulation resistance value of the tested object is
very high, and there is the serious word jump phenomenon, then
please connect the shield terminal G. For example: measuring the
cable core and cable shell, besides connecting the two ends of the
tested object to the terminal E and L separately, you are also
supposed to connect the inner insulation of the cable core or cable
shell to the shield terminal G, in order to avoid the measuring error
resulted by the surface leakiness. Further more, you can also use
the shielding box. That is to say just put the tested object into the
metal shielding box, then connect the shielding box to the
instrument shielding terminal G.
5.6 When the measurement is finished, then remove the
2
1
3 4
6
5
7
9
10
11
12
13
8
9
