Telecommunications Insulation Testers
電訊絕緣測試儀
Model : MIT481
The MIT481 of insulation and continuity tester offers those working in electrical engineering, the electrical supply industry and in maintenance, repair and servicing of industrial equipment and manufacturing processes a convenient test instrument.
It is also very useful for the checking of the electrical system in hybrid and electric vehicles. the safety and comfort of a modern purpose designed instrument.
* Specification
Insulation
Nominal test voltages
MIT481 50 V, 100 V, 250 V, 500 V, 1000 V
Insulation resistance range
MIT481 200 GΩ
Range Full Scale Accuracy
All ranges ±2% ±2 digits up to 100 MΩ.
1000 volts ±3% ±2 digits ±0.2% per GΩ
500 volts. ±3% ±2 digits ±0.4% per GΩ
250 volts. ±3% ±2 digits ±0.8% per GΩ
100 volts. ±3% ±2 digits ±2.0% per GΩ
50 volts. ±3% ±2 digits ±4.0% per GΩ
Analogue range 1 GΩ full scale
Short Circuit Current: 2 mA +0% -50%
Terminal voltage: -0% +20% ±1 V
Test Current on load:
1 mA at min. pass value of insulation specified in BS7671, HD384
and IEC364, 2 mA max.
EN61557 Operating range: 0,10 MΩ to 1,00 G
Leakage current range: 10 µA 2000 µA
Leakage current: 10% ±3 digits
Voltage display: 3% ±3 digits ±0.5% of rated
voltage
Polarisation Index (PI): 10 min / 1minute ratio
Dielectric Absorption Ratio (DAR): 60 sec / 30 sec ratio
Notes:
(1) All ranges measure from 0,00 MΩ upwards.
(2) Above specifications only apply when high quality silicone leads
are being used.
Continuity
Measurement: 0,01 Ω to 99,9 Ω (0 to 100 Ω on
analogue scale)
Accuracy: ±2% ±2 digits (0 to 100 Ω)
Open circuit voltage: 5 V ±1 V
Test current: 205 mA (–0 mA +20 mA)
(0.01 Ω to 9.99 Ω)
20mA (±1 mA )
(10.0 Ω to 99.9 Ω)
Zero offset at probe tips: 0,10 Ω typical
Lead resistance zeroing: Up to 9,99Ω
Buzzer: Variable limit 1 Ω, 2 Ω, 5 Ω,
10 Ω, 20 Ω
Resistance Measurement:0,01 kΩ to 1000 kΩ (0 to 1 MΩ
on analogue scale)
Accuracy: ±3% ±2 digits up to 50 kΩ
then ±2 digits
Open circuit voltage: 5 V ±1 V
Short circuit current: 1.5 mA ±0.2 mA
Voltage range
0 to 600 V d.c. ±2% ±2 digits
10 mV to 600 V TRMS sinusoidal (40 to 400 Hz) ±2% ±2 digits
0 to 1000 V on Analogue scale
Unspecified input level 0 – 10 mV (40 to 400 Hz)
For non-sinusoidal waveforms additional specification
apply:
±3% ±2 digits 101 mV to 600 V TRMS and ±8% ±2 digits 10 mV to
100 mV TRMS
Default Voltmeter: Operates at >25 V a.c. or d.c.
on any range except OFF
Frequency: 40-450 Hz (40 Hz – 99,9 Hz)
±0.5% ±1 digit (100 Hz to
450 Hz)
Capacitance measurement
MIT481
Measurement range: 100 pF to 10 µF
Accuracy: ± 5.0% ±2 digits
Distance by capacitance:
MIT481
Arithmetic conversion from capacitance measurement on
Default capacitance measurement: 50nF/km
Capacitance range: 40 nF/km to 60 nF/km
Result storage
Capacity: >1000 test results
Download: Bluetooth wireless
Bluetooth Class: Class II
Range: up to 10 m
Power Supply:
5 x 1,5 V cells type IEC LR6 (AA, MN1500, HP7, AM3 R6HP) Alkaline
NiMH rechargeable cells may be used.
Battery life: 2200 insulation tests with duty cycle of 5 sec ON /55
sec OFF @ 1000 V into 1 MΩ
Dimensions
Instrument: 220 x 92 x 50 mm (8.66 in. x 3.63 in. x 1.97 in.)
Instrument + case: 456 x 178 x 89 mm (18 in. x 7 in. x 3.5 in.)
Weight
Instrument only: 590 gms, 775 gms with boot
(20.73 oz., 27.22 oz.)
Instrument plus case: 1.75kg (3.86 lb)
Fuse
Use only a 500 mA (FF) 1000 V 32 x 6 mm ceramic fuse of high
breaking capacity HBC 50 kA minimum. Glass fuses MUST NOT be
fitted.
Safety Protection
The instruments meet IEC 61010-1 to 600 V phase to earth, Category
- Refer to safety warnings supplied.
E.M.C.
In accordance with IEC 61326-.1
Temperature effects
Temperature coefficient: <0,1% per °C up to 1 GΩ
Environmental
Operating range: -20 to +55°C
Operating humidity: 95% RH at 0ºC to +35ºC,
70% RH @ +35ºC to +55ºC
Storage temperature range: -30 to +80°C
Calibration Temperature: +20°C
Maximum altitude: 2000 m
Dust and water protection:
IP54 Protected against dust and splashing water
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