QJ47 portable DC single double arm bridgeDetailed product description：

QJ47 portable DC single double arm bridge

1. Purpose:
The QJ47 portable DC single and double arm bridge is a portable precision DC single and double arm dual-use bridge (hereinafter referred to as single bridge and double bridge), suitable for on-site precision measurement of various metal conductors and various switch contact resistances in industrial and mining enterprises
2,
2.1: Accuracy level: 0.05 level
2.2: Measurement range: 10-3-106 ohms
2.3 The nominal range limits and allowable variations are shown in Table 1

impact quantity	Grade index	Nominal usage limit range			Permitted variation
		effective range ten-2---10fiveEurope	effective range tenfive---10sixEurope	effective range ten-3---10-2Europe
ambient temperature	0.05%	Reference value ± 10 ℃			100%
	0.2%		Reference value ± 15 ℃	Reference value ± 18 ℃
relative humidity	All levels	25---80%			20%
power supply voltage	All levels	Rated value+15% －17%			10%

Note: The nominal range of use for a single bridge is 105____. At 106, an additional power supply of 4.5__ volts is required


2.4 Basic Error Formula: Elim=5 × 10-4 (__RN+X)
In the formula: Allowable error limit of Elim__ (in ohms)
RN____ benchmark value (Euro)
X______ dial indication (Euro)
2.5 Reference conditions and allowable error indication for determining basic error

impact quantity	Reference conditions and tolerances	Single bridge
		effective range	Grade index%
ambient temperature	20±2℃	ten__tenfive	zero point zero five
	20±5℃	ten__tenfive	zero point two
		Double bridge
		Effective range (in ohms)	Grade index%
	20±2℃	ten-2__tentwo	zero point zero five
	20±5℃	ten-3__ten-23	zero point two
relative humidity	forty___70%
power supply voltage	Single bridge (internal) 1.5 volts: Double bridge (external) 1.5 volts__2 volts or 2.5A
	Single bridge effective range 105___-tensixEuro time, requires 4.5 connections___6 volts

3. Power supply voltage
3.1 Single bridge: Two 1.5-volt No.1 batteries (internal), single, dual bridge shared
3.2 Dual Bridge: When the S-disk is set to ≤ 0.1, an external 2-volt power supply or 2.5A cross current source is required. If testing requirements are not high, a 1.5-volt A battery (external) can also be used
3.3 Amplifier Power Supply __9 Stacked Battery Section
4: Under the conditions of 2.3, the insulation strength between the metal components that can be in contact with the circuit and the casing should be able to withstand a frequency of 50 Hz, an actual sine wave AC voltage of 500 volts, and a duration of one minute
Under the conditions of 2.3, the insulation resistance between the metal components that can be in contact with the circuit and the casing is ≥ 2000 megaohms
6. Usage location:
7 Dimensions: 340 × 240 × 135Mmm
8 Weight:<5 kilograms