Calibrators, Standards
5 subcategories
Calibrators and standards are the baseline reference instruments used to verify, adjust, and trace the accuracy of other test and measurement equipment. In industrial and metrology laboratories, these instruments establish the unbroken chain of traceability to national standards. This category spans multifunction electrical calibrators, RF/microwave calibration kits, and dedicated signal generation platforms. Selecting the correct calibrator or standard requires matching the specific electrical parameters, frequency ranges, and connector interfaces of the devices under test.
- Maximum DC Voltage Source
- Up to ±1100 V (Fluke 5700A)
- VNA Calibration Limits
- DC to 26.5 GHz (Keysight 85052D)
- RF Port Configurations
- 2, 3, or 4 Ports (Keysight N4431B)
- Reference Impedance Options
- 50 Ω or 75 Ω (Keysight 85036B)
Subcategories
Multifunction Electrical Calibrators
Multifunction calibrators serve as high-precision sources for verifying multimeters and other electrical measurement tools. Instruments such as the Fluke 5500A and Fluke 5520A provide wide-ranging sourcing capabilities, including DC and AC voltage up to ±1020 V, DC/AC current, resistance, and capacitance. The Fluke 5520A extends these capabilities with continuously variable resistance up to 1100 MΩ and capacitance up to 110 mF. For high-precision metrology applications, the Fluke 5700A and Fluke 5720A offer discrete decade resistance values ranging from 1 Ω to 100 MΩ and DC voltage up to ±1100 V.
In addition to sourcing instruments, the category includes high-accuracy measurement standards. The Fluke 5790A functions as an automated AC measurement standard, utilizing thermal transfer technology to measure AC voltage from 2.2 mV to 1000 V RMS with a 24-hour uncertainty of ±24 ppm. Specialized calibrators, like the Keysight 11683A, are dedicated to verifying power meters by providing precise discrete power outputs from 3 µW to 100 mW with an uncertainty of ±0.25%.
VNA Calibration Kits: Mechanical and Electronic
Vector Network Analyzers (VNAs) require systematic error correction before making RF and microwave measurements. This is accomplished using calibration kits, which are categorized into passive mechanical standards and solid-state electronic modules.
- Mechanical Calibration Kits: These kits use physical standards—typically Short, Open, Load, and Thru (SOLT). The Keysight 85033E (DC to 9 GHz) and Keysight 85033D (DC to 6 GHz) feature 3.5 mm connectors. For Type-N interfaces, kits like the Keysight 85032B (DC to 6 GHz) and Keysight 85032F (DC to 9 GHz) provide 50 Ω reference standards, while the Keysight 85036B operates up to 3 GHz for 75 Ω systems. Higher-frequency setups require mechanical kits like the Keysight 85052D, which reaches 26.5 GHz, or specialized connector styles like the genderless APC-7 connector found in the Keysight 85031B (DC to 6 GHz).
- Electronic Calibration (ECal) Modules: ECal modules replace multiple manual connections with an automated, USB-controlled solid-state switching system. This reduces operator error and connector wear. Examples include the 2-port Keysight N4691B (300 kHz to 26.5 GHz), the 4-port Keysight N4431B (9 kHz to 13.5 GHz), and the 2-port Keysight 85093C (3.5 mm) and Keysight 85092C (Type-N), both covering 300 kHz to 9 GHz.
RF Signal Standards and Field Integration
For complex signal generation and transmission channel simulations, specialized platforms like the Rohde & Schwarz SFU act as an all-in-one broadcast and mobile TV test standard. Operating from 100 kHz to 3 GHz, it supports digital baseband processing and noise, fading, and interference simulation.
In field environments, handheld analyzers like the Anritsu MS2711D (100 kHz to 3.0 GHz) rely on accurate external standards to maintain system synchronization. The MS2711D features a 10 MHz external reference input to connect to stable system standards, ensuring precise frequency accuracy during outdoor troubleshooting and installation tasks.
Frequently asked questions
- What is the primary benefit of Electronic Calibration (ECal) over mechanical kits?
- ECal modules, such as the Keysight N4691B or Keysight N4431B, allow for a full multi-port VNA calibration with a single physical connection. This minimizes manual intervention, speeds up the calibration process, and significantly reduces wear on both instrument and calibration kit connectors.
- How does system impedance affect the choice of calibration standard?
- Calibration standards must match the nominal impedance of the system under test to ensure accuracy. For example, a 50 Ω system requires a 50 Ω standard like the Keysight 85032B, while a 75 Ω system must use a dedicated 75 Ω kit such as the Keysight 85036B to prevent physical connector damage and impedance mismatches.
- Are there standards designed specifically for power meter verification?
- Yes. Instruments like the Keysight 11683A range calibrator are designed specifically to verify full-scale readings, range tracking, and auto-zero circuits of compatible power meters. It accomplishes this by sourcing precise, discrete calibration outputs from 3 µW to 100 mW.