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臺灣標準電機SEW儀器儀表--1120 ER Earth Resistance Testers 3 Wire Digital

1120 ER Earth Resistance Testers
3 Wire (Digital)

FEATURES

Capable of measuring earth voltge.
2mA measuring current permits earth resistance to test without tripping earth leakage current breakers in the circuit.
Test leads are supplied as standard accessories for simplified two-wire measuring system.
0 Ohm adjustment.
Data hold function.
Battery operated.
Battery life indicator.
Standard accessories for 3T and 2T.

Calibration performed with supplied test leads.

The 1120 ER is a "professional instrument". The instrument is suitable for the testing of single earth electrodes such as lightning conductors and other small earthing system. The resistance of conductors such as continuity and conduit coupling joints can also be measured. Two-terminal operation measurement, which reduces the accuracy, can also be done by shorting P and C terminals.

Earth resistance can be measured directly from 0.01 Ohms up to 1999 Ohms. The reading is displayed on a large, easy-to-read digital display. It has a zero 0 ohm adjustment setting that is controlled by a dial feature.

The 1120 ER makes meaureents by passing a constant current through the device under test (generally a conductor or low resistance) and measuring the voltage across it. The earth resistance is then calculated by Ohm's law.

It has an advanced circuit design that permits the instrument to operate with the minimum influence from earth voltage and earth resistance of the auxiliary spikes. This superb instrument is powered by 8 x 1.5 folt manganese-alkaline AA batteries. The calibration of the instrument is performed with the included test leads. Therefore, when using the supplied test leds, the accuracy does not suffer of the three-terminal method of measurement fro the most common applications.

The test frequency of 820Hz has been chosed to avoid stray currents at power frequencies and their harmonics. However, the 1120 ER has a built-in filter to reject unwanted signals. The batteries are constantly being checked while in use. The case is ideal for outdoor work. with the 1120 ER can be used by the electrical contractor or maintenance engineer to check the effectiveness of thir type of earth electrode systems.

SPECIFICATIONS

Measuring Ranges	Earth Resistance : 0-20 Ohm/0-200 Ohm/0-2000 Ohm
	Earth Voltage : 0-200V AC (40-500Hz)
Accuracy	Earth Resistance : +/- (2%rdg+2dgt) or +/- 0.1 Ohm, which is greater
	Earth Voltage : +/- (1%rdg+2dgt)
Earth Resistance Resolution	0-20 Ohm (0.01 Ohm)
	0-200 Ohm (0.1 Ohm)
td>	0-2000 Ohm (1 Ohm)
Measuring System	Earth Resistance by constant current inverter 820 Hz approx. 2mA
Display	LCD 3-1/2 digit (2000 counts)
Open Circuit Indication	LED will be unlit
Low Battery Indication	symbol appears on thedisplay
Data Hold Indication	symbol appears on the display
Over Range Idication	"1" (MSD)
Power Source	1.5V SUM-3 (AA) x 8 or equivalent
Dimensions	175(L) x 85(W) x 75(D) mm
Weight	Approx. 600g (battery included)
Accessories	Test leads (AL-36 : red-15m, yellow-10m, green-5m)
	Auxiliary earth spikes
	Simplified measurement probe
	Shoulder belt, instruction manual, batteries

特點

● 可量測接地電阻(0-2000Ω)和接地電壓(0-200V AC)。
● 量測電流僅有2mA,不易影響漏電斷路器的跳脫。
● 提供標準的三線式量測和簡易測試線。
● 有調(diào)整測試線電阻的歸零設計。
● 讀值鎖定功能。
● 電源不足顯示。
● 使用電池操作。

規(guī) 格 (23°C±5°C ＜80%R.H.)

量測檔位	接地電阻 : 0-20Ω/0-200Ω/0-2000Ω 接地電壓 : 0-200V AC (40-500Hz)
準確度	接地電阻 : ±(2%讀值+2位數(shù)) 接地電壓 : ±(1%讀值+2位數(shù))
接地電阻解析度	0-20Ω : 0.01Ω 0-200Ω : 0.1Ω 0-2000Ω : 1Ω
量測系列	820Hz 2mA 定電流
電量不足指示	LCD 上出現(xiàn) : 符號
讀值鎖定指示	LCD 上出現(xiàn) :符號
外形尺寸	175(長)×85(寬)×75(高)mm
重量	約600克(含電池)
使用電池	1.5V (AA)×8(顆)