The Agilent/Keysight 2804A represents two distinct discontinued instruments: a precision quartz thermometer and a high-voltage differential probe. The 2804A Quartz Thermometer delivers absolute accuracy of ±0.04 °C across a -80 °C to +250 °C range with 0.0001 °C resolution, featuring NBS traceability to IPTS-68 and adjustable ice-point or triple-point calibration. The N2804A High-Voltage Differential Probe extends measurement capability to ±300 VDC + peak AC with 300 MHz bandwidth and 100:1 attenuation, achieving >70 dB CMRR at 1 MHz through 4 MΩ differential input resistance and 4 pF input capacitance.
Technical Specifications
Quartz Thermometer
• Absolute accuracy: ±0.04 °C
• Temperature range: -80 °C to +250 °C
• Resolution: 0.0001 °C or 0.001 °F
• Display modes: Absolute or differential temperature
• Calibration traceability: NBS (IPTS-68)
High-Voltage Differential Probe
• Bandwidth: 300 MHz (without extension leads)
• Maximum differential voltage: ±300 VDC + peak AC
• Attenuation ratio: 100:1
• Common mode rejection ratio: >70 dB at 1 MHz
• Differential input resistance: 4 MΩ
• Input capacitance: 4 pF
• Zero offset: Adjustable
– Key Features
• Extension leads (30 cm) incorporate built-in damping resistor for resonant frequency suppression and flat frequency response
• Quartz thermometer interfaces via HP-IB with variable resolution analog output
• Probe powered directly from oscilloscope AutoProbe interface
• Supplied accessories: two alligator clips, two pincer clips, two 30 cm extension leads, trimmer tool
– Compatibility & Integration
The N2804A probe integrates with Keysight InfiniiVision and Infiniium Series oscilloscopes through the AutoProbe interface, enabling conventional earth-grounded oscilloscopes to perform safe floating signal measurements.
– Product Status
Both the Agilent 2804A Quartz Thermometer and Keysight N2804A High-Voltage Differential Probe are discontinued and no longer supported by Keysight.
