ZY4 Double arm bridge calibration standardDetailed product description：

ZY4 type double arm bridge calibration standard

Description
The ZY4 double bridge calibration standard is mainly used to make up for the shortcomings of the current high-precision adjustable standard, and to provide a practical combination standard for double bridge users, measurement stations, or maintenance centers who lack calibration standards. The entire instrument consists of two independent systems, namely the zeroing system and the standard resistance system, which can be used together or separately. Used as a standard or calibration device for the overall calibration of double bridges at levels below 0.05%, and can also be used as a zero point indicator for balancing circuits and for maintenance and sensitivity comparison of portable bridge zero point indicators
Main technical performance
1. Main parameters of each standard resistor (see table)
2. Zero point instrument system:
Voltage sensitivity is about 1.2 grids/μ V (approximately 1.4mm per grid)
Damping time:<4s
Indicator: ± 25 μ A (internal resistance of approximately 4k Ω, level 1.5, ± 50 division band)
Reflective mirror)
3. Zero pointer power supply: 1 6F22 type 9V laminated battery
4. Dimensions: 435 × 225x150 (mm)
5. Quality: Approximately 5kg
This instrument has eight fixed value standard resistors and three sets of stepper resistor sockets. According to the requirements of the standard instrument for 0.05% double bridge calibration. The highest accuracy is 0.01%. The accuracy decreases below 0.01 Ω, and the pattern of decrease is consistent with the decrease in accuracy of the double bridge in different measurement ranges.

Main parameters of each standard resistor

fixed value mark accurate electricity block	resistance value (Ω)	accuracy (%)	reference power (Current)	Short term maximum power (Current)	Usage environment temperature	Usage environment relative humidity
	one thousand	zero point zero one	0.05W	0.2W	20±15℃ Double bridge calibration temperature: (1)0.05% 20±2℃ (2) 0.1% 20±10℃ (3) Below 0.1% 20±15℃	≤80%
	one hundred
	ten
	one
	ten-1		0.5A	1A
	ten-2	zero point zero two	1.5A	2.5A
	ten-3	zero point zero five	3.5A	6A
	ten-4	zero point one
variable standard resistance	11×10	zero point zero one	0.05W	0.2W
	11×1
	11×10-1	zero point zero two

ZY4 type double arm bridge calibration standard