5790A

The Fluke 5790A is a highly accurate automated AC measurement standard designed for calibration and metrology applications. Combining the precision of a thermal transfer standard with the ease of use of a digital voltmeter, it provides exceptional AC voltage measurement accuracy, wideband capability, and robust system integration.

Calibration Metrology Voltage Measurement

Specifications

General

Parameter	Value
Interfaces	GPIB (IEEE-488.2), RS-232-C
Display	Vacuum Fluorescent Display (VFD)

Physical

Parameter	Value
Power Supply	100 V / 120 V / 220 V / 240 V AC (±10%), 47 Hz to 63 Hz, 120 VA
Operating Temperature	0 to 50 °C
Dimensions (W×H×D)	432 mm × 178 mm × 473 mm
Weight	24 kg (53 lb)

AC Voltage Measurement Performance

Parameter	Value
AC Voltage Ranges	2.2 mV, 7 mV, 22 mV, 70 mV, 220 mV, 700 mV, 2.2 V, 7 V, 22 V, 70 V, 220 V, 700 V, 1000 V
Frequency Range	10 Hz to 1 MHz
Best 24-Hour AC Voltage Uncertainty	±24 ppm
Best 1-Year AC Voltage Uncertainty	±110 ppm
Absolute Display Resolution	6.5 digits
Inputs 1 & 2 Impedance	1 MΩ shunted by 140 pF
Input 3 Impedance	1 MΩ shunted by 150 pF
Maximum Input Voltage	1000 V RMS
Maximum Peak Input Voltage	1414 V Peak

AC/DC Transfer Difference & Shunt Support

Parameter	Value
AC/DC Transfer Resolution	1 ppm (0.0001%)
AC/DC Transfer Repeatability	±1 ppm
Compatible External Current Shunts	Fluke A40 and A40A series shunts
External Shunt Input Voltage Range	Up to 2.2 V (via Input 3 / Aux Input)

Analog & Guard Connections

Parameter	Value
Input 1 Connector Type	Type N female
Input 2 Connector Type	Type N female
Input 3 Connector Type	Dual binding posts
Guard Terminal Configurations	Binding post, switchable internally or externally
Isolation Input to Guard	>10^10 Ω, <150 pF
Isolation Guard to Chassis	>10^9 Ω, <0.1 µF
Chassis Ground Terminal	Rear-panel binding post

Wideband Voltage Performance (Optional)

Parameter	Value
Wideband Voltage Ranges	2.2 mV, 7 mV, 22 mV, 70 mV, 220 mV, 700 mV, 2.2 V, 7 V (with Option 5790A-03)
Wideband Frequency Range	10 Hz to 30 MHz (with Option 5790A-03)
Wideband Best 1-Year Uncertainty	±0.25% to ±0.5% (frequency dependent)
Wideband Input Connector Type	Type N female (Input 4)
Wideband Input Impedance	50 Ω

Frequency Measurement

Parameter	Value
Frequency Measurement Range	10 Hz to 1 MHz (up to 30 MHz with Wideband Option)
Frequency Measurement Accuracy	±0.01% (±100 ppm)
Frequency Measurement Resolution	6 digits

Metrological Reliability & Reference

Parameter	Value
Internal Reference Type	Solid-state zener reference standard
Warm-up Time to Rated Accuracy	30 minutes
Recommended Calibration Cycle	1 year (or 90 days for higher accuracy requirements)

Environmental Specifications

Parameter	Value
Calibration Temperature Range	18 °C to 28 °C
Storage Temperature Range	-40 °C to 75 °C
Relative Humidity Limits (Operating)	Max 80% non-condensing up to 30 °C, 75% up to 40 °C, 45% up to 50 °C
Operating Altitude	Up to 3,050 meters (10,000 feet)
Non-Operating Altitude	Up to 12,200 meters (40,000 feet)
Shock and Vibration Compliance	Complies with MIL-T-28800D Type III, Class 5, Style E

Physical & Mechanical Characteristics

Parameter	Value
Enclosure Style	Metal outer chassis with optional rack mount capability

Compliance & Safety

Parameter	Value
Safety Compliance	IEC 1010-1, ANSI/ISA-S82.01, CAN/CSA-C22.2 No. 1010.1-92
Overvoltage Category	CAT II
EMC Compliance	EN 55011 Class A, EN 50082-1

Performance

Parameter	Value
Crest Factor	6:1 at full scale, up to 10:1 at downscale inputs

Inputs

Parameter	Value
Input 1 Capacitance	< 150 pF
Input 2 Capacitance	< 150 pF
Wideband Input Maximum Continuous Power	1 W
Wideband Input Maximum Voltage	7 V RMS (10 V peak)

Outputs

Parameter	Value
Analog Output Voltage Range	0 V to 3 V DC (proportional to input)

Power Requirements

Parameter	Value
Power Consumption	120 VA (maximum)
Line Frequency Range	47 Hz to 63 Hz
Mains Voltage Selection	90 V to 132 V AC / 180 V to 264 V AC, manually switchable

Options

Parameter	Value
Hardware Options	Option 5790A-03 Wideband AC Voltage (10 Hz to 30 MHz)

Wideband Option (Option 5790A-03)

Parameter	Value
Wideband Input VSWR	< 1.01 (10 Hz to 1 MHz), < 1.02 (1 MHz to 10 MHz), < 1.05 (10 MHz to 30 MHz)

DC Voltage Capability

Parameter	Value
DC Voltage Measurement Ranges	2.2 mV to 1000 V (in 13 ranges)

Inputs & Outputs

Parameter	Value
Total Number of Input Channels	4 (Input 1, Input 2, Input 3, and Wideband Option Input)

Measurement Technology

Parameter	Value
RMS Sensor Type	Patented solid-state RMS sensor

Technology

Automated AC/DC Thermal Transfer Standard

Applications

AC Voltage Calibration and Metrology Standard