SRAC IET | Alldatasheet

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IET LABS, INC. in the Gen Rad Tradition www.ietlabs.com TEL: (516) 334-5959 • EMAIL: info@ietlabs.com SRac Series Page 1 of 1 ac Standard Resistance Working Standards SRac Datasheet March 2020 Features:

  • Very stable - <20 ppm/year
  • Calibrated at dc and 1 kHz
  • Excellent temperature coeffi cient - as low as 1 ppm/°C
  • < 20 ppm diff erence between dc and ac values at 1 kHz for resistances ≤ 100 kΩ
  • Wide range of values - 1 mΩ to 10 MΩ
  • bnc option (-bnc)
  • Custom values are available
  • Optional transit case Economical high performance ac resistance standards SRAC SERIES Designed for use as a reference or work- ing standard in in dus tri al, re search, and ed u ca tion al laboratories. Model SRac- Nominal (Ω) Initial adjustment to nominal (ppm) Stability 1 year (ppm) Tempco (ppm/°C) Resistor type Calibration uncertainty dc (Typical) (ppm) dc to ac change at 1 kHz (Typical) (ppm) Max. power (W) Max. voltage (V) Max. current (A) Terminals 0.001 0.001 200 50 20 Manganin strip 200 0.2 0.015 14 4 bp's + gnd 0.1 0.1 100 20 Foil 60 0.3 0.17 1.7 1 1 1 10 0.3 0.54 0.54 10 10 2 5 0.6 2.45 0.245 100 100 1 5 24.5 0.024 1K 1 k 1 5 77.5 7.7 mA 10K 10 k 1 2 245 2.5 mA 100K 100 k 1 2 300 2 mA 1M 1 M 5 Wirewound 5 250 0.5 700 0.7 mA 10M 10 M 15 Film 10 2500 0.1 1000 0.1 mA Foil resistors have a power coeffi cient of resistance (PCR) of ±5ppm at rated power due to internal heating Foil resistors have a voltage coeffi cient (VC) of < 3ppm/V SPECIFICATIONS SRac Series Resistance Standard Calibration conditions: At 23°C, low power, traceable to the SI through an NMI. Connections as indicated in table. Terminals: Gold plated, tellurium copper, high current, heavy duty,low thermal-emf binding position standard 3/4 inch spacing. A case GROUND terminal is provided on all units. Dimensions: 8.6 cm H x 10.5 cm W x 12.7 cm D (3.4" x 4.15" x 5") Operating temperature range: 15 to 30°C. Transit case: Optional Model SRC-100 light weight transit case with handle, suitable for transporting and storing two units. The case provides mechanical protec- tion and insulation from temperature chang es during trans por ta tion or shipping. Optional Model SRC-100-5 light weight transit case with handle, suitable for transporting and stor- ing 5 SRC/SRX resistance standards. bnc option: Option -bnc changes Hi and Lo binding posts to 4 x bnc connectors plus the ground binding post. SRC-100-5 Lightweight transit case for 5 standards Standard model Select from table above Custom value SRX- XXX or SRC-XXX Transit case for SRac units SRC-100, for 2 units SRC-100-5, for 5 units

ORDERING INFORMATION

Frequency response of the foil resistors are given by the formula below: Options: -bnc 4 bnc connectors plus ground