5790B AC Measurement Standard

Overview

The 5790B AC Measurement Standard is specified as a precision AC and dc voltage standard with absolute specification: ± 24 ppm (one year, 23 °C to ± 5 °C). The 5790B/AF variant adds an RF-characterized mode with enhanced absolute accuracy to ± 0.23 % of voltage (1 year after factory calibration, 23 °C ± 3 °C, at 95 % confidence level) at 50 MHz and 223.61 mV when used with a serialized one meter cable; RF power measurement accuracy is specified to the end of the serialized cable with a first-order cable-loss correction curve fit for other ranges and frequencies. Inputs and signal handling: Input 1 and Input 2 each accept 600 µV to 1000 V (5% over-range). Aux input accepts 250 mV to 500 mV. WB input is specified as <7 V rms wideband. Surge immunity is listed as ANSI C62.41-1980, Category A. Mechanical and electrical utilities: Height is 17.8 cm (7 in) standard rackmount + 1.5 cm (0.6 in); width is 43.2 cm (17 in); depth is 62 cm (24.8 in). Weight: 5790B: 24 kg (53 lb); With wideband: 24.5 kg (54 lb). Line power: 50 Hz or 60 Hz; 100 V - 120 V, 220 V - 240 V with specific supported taps of 100V, 110 V, 115 V, 120 V, 200 V, 220 V, 230 V, 240 V. Maximum power requirements: 5790B: 100 VA. Warm-up time: 30 minutes. Environmental, reliability and interfaces: Operating temperature 0 °C to °50 C; calibration temperature 15 °C to 35 °C; storage -40 °C to 70 °C. Altitude: Operating: 3,050 meters (10,000 feet); Non-operating: 12,200 meters (40,000 feet). Relative humidity: Operating: 45% to 50 °C 75% to 45 °C 95% to 30 °C; Storage: <95% non-condensing. Reliability reference: MIL-T-2880D, paragraph 3.13.3. Confidence level: 99% unless otherwise specified. Remote interfaces: RS-232, IEEE-488. Electromagnetic Compatibility: International: IEC 61326-1: Controlled Electromagnetic Environment - CISPR 11: Group 1, Class A; Korea (KCC): Class A Equipment (Industrial Broadcasting & Communication Equipment); USA (FCC): 47 CFR 15 subpart B. This product is considered an exempt device per clause 15.103. Safety compliances listed: Complies with UL1244 and IEC 348-1976 and IEC 1010 and CSA C22.2 No. 231 and ANSI/ISA S82. Primary use is as a laboratory-grade AC/DC voltage reference and calibration standard for industrial calibration labs, metrology facilities, and manufacturing test calibration benches requiring ppm-level absolute accuracy. The 5790B/AF variant is configured and characterized for RF power meter reference output measurements (0 dBm reference) up to 50 MHz when used with the serialized cable, making it suitable for RF calibration tasks in test labs and production verification of RF power sensors. Integration and operational context: the unit is rack-mountable and supports remote automation via RS-232 and IEEE-488, enabling inclusion in automated calibration sequences and factory test systems. Allow a 30-minute warm-up and perform calibrations in the specified calibration temperature range (15 °C to 35 °C) to achieve stated accuracies; observe listed environmental, altitude, and power requirements when installing in production or laboratory racks.