For full functionality of this site it is necessary to enable JavaScript.

Điện trở chuẩn IETLAB RS925D (- 20 ppm + 0.5 mΩ; 10 mΩ tới 1.1 MΩ )

( Khách hàng chọn model, thông số chi tiết tại mục Datasheet, Download/video. )

Độ chính xác cao - 20 ppm + 0.5 mΩ
Tính ổn định cao - 20 ppm + 0.5 mΩ
Điện trở từ 10 mΩ tới 1.1 MΩ
Độ phân giải 20 μΩ 

Chi tiết

datasheet

manual

esi RS925D BASIC SPECIFICATIONS

Resistance per step Total decade resistance Max current Max power Temperature coefficient(ppm/C) Power coefficient(ppm/mW)
20 μΩ Rheostat
10 mΩ
2A
NA
20
1
10 mΩ
100 mΩ
2A
NA
20
1
100 mΩ
1 Ω
2A
NA
20
1
1 Ω
10 Ω
1A
5 W
20
0.4
10 Ω
100 Ω
0.33 A
5 W
10
0.3
100 Ω
1 kΩ
0.1 A
5 W
3
0.1
1 kΩ
10 kΩ
33 mA
5 W
3
0.1
10 kΩ
100 kΩ
10 mA
5 W
3
0.1
100 kΩ
1 MΩ
3 mA
2000 V peak
3
0.1
Wiring and switch resistance
NA
50 μΩ/C
0.2 μΩ/W
NA
 

The IET (esi) RS925D is a four-terminal continuously variable decade resistor for the most exacting calibration and test applications.
For a wider range or more cost effective decade resistor with similar performance consider our HARS-LX Series

The RS925D is the world's highest accuracy continuously variable resistance decade for the most exacting calibration and test applications.

The RS925D resistance decade box is a precision resistance source with excellent characteristics of accuracy, stability, temperature coefficient, and power coefficient. All these features serve to make it a laboratory resistance standard, exceeded in performance only by stand-alone standard resistors.

Hermetically sealed wirewound resistors are used for 1 Ω steps and over. These resistors are carefully conditioned under power and temperature in order to develop the best stability characteristics. Actual experience has shown them to exhibit a storage stability of better than 5 ppm/year, improving as they age. The low-resistance resistors are constructed with resistance wire with a minimum of copper resistance in series to limit temperature coefficient effects.

The resistance substituter has a fixed minimum resistance of 10 mΩ. This is implemented by mechanically limiting the 10 mΩ decade from going below the “1” position. In this manner, no zero resistance subtractions have to be made, and the accuracy given is for the absolute reading.

The RS925D Resistance Decade employs completely enclosed dust-tight very low contact resistance switches. They feature solid silver alloy contacts and quadruple-leaf silver alloy wipers which keep switch contact resistance to under 1 mΩ per decade, and more importantly, keep switch contact resistance reproducible, insuring repeatable instrument performance.

High quality gold plated tellurium copper binding posts minimize the thermal emf effects which would artificially reflect a change in dc resistance measurements. All other conductors within the instrument, as well as the solder employed, contain no metals or junctions that contribute to thermal emf problems.

The RS925D Resistance Decade is designed to allow very convenient maintenance of calibration over time. Most decades can be calibrated without changing components or soldering resistors. The decades for the 100 Ω through 100 kΩ steps are calibrated with convenient trimmers. Trimming of the lower decades is also possible.

With a resolution as low as 1 mΩ and a maximum available resistance of over 12.2 MΩ, the RS925D Resistance Decade may be employed for exacting precision measurement applications requiring high accuracy and stability. They can be used as components of dc and low frequency ac bridges, for calibration, as transfer standards, and as RTD simulators

  • Cam kết chất lượng
  • Bảo hành chính hãng
  • Giao hàng tận nơi
  • Đơn giản hóa giao dịch

Đăng ký nhận bản tin - cơ hội nhận khuyến mãi