The HP 8477A Calibrator is a precision instrument engineered specifically for calibrating HP 432-series power meters. It supplies DC voltages that simulate thermistor mount resistances and verify bridge circuit operation, enabling engineers to confirm full-scale meter readings across all ranges and validate meter tracking accuracy. A simple three-cable connection between calibrator and power meter eliminates the need for external charts or supplementary instruments, streamlining the calibration workflow.
Technical Specifications
Calibration Output Voltages: 0.01, 0.03, 0.1, 0.3, 1, 3, and 10 mW
Calibration Uncertainty:
• ±0.5% on 0.01 and 0.03 mW ranges (at +20°C to +30°C)
• ±0.2% on 0.1 to 10 mW ranges (at +20°C to +30°C)
Input Impedance: 10 megohm floating
Power Requirements:
• 115 or 230 VAC ±10%, 50 to 400 Hz
• Approximately 3 Watts
• 33 VA maximum
RFI Compliance: Meets MIL-1-6181D
Physical Dimensions:
• Width: 130 mm (5.2 inches)
• Height: 155 mm (6.1 inches)
• Depth: 279 mm (11.0 inches)
• Weight: 2.04 kg (4 lbs, 8 oz)
– Key Features
• Front panel controls: ZERO ADJUST, TEST 432, SET, CHECK, and POWER (mW)
• LINE ON switch with indicator lamp
• Supports both 100 ohm and 200 ohm thermistor mount resistances
• VRF and VCOMP connections with dedicated BNC test points
• Outputs correct DC voltages to verify 432 bridge amplifier gain
– Typical Applications
Field calibration of HP 432-series power meters without external reference standards. Direct verification of meter full-scale readings and tracking performance. Bridge amplifier gain assessment and adjustment.
– Compatibility & Integration
Designed for HP 432A and HP 432B Power Meters. Compatible with thermistor mounts including HP 478B, 8478B, and 486 series.
