Operating and service manual for HP 8481A, 8482A and 8483A power sensors, including parts, troubleshooting and repair procedures.
This manual provides service information for the HP 8481A, 8482A and 8483A Power Sensors. It covers principles of operation, recommended test equipment, and detailed wiring and load specifications. The document also lists replaceable parts with Hewlett‑Packard part numbers and ordering instructions.
Detailed procedures for disassembly, troubleshooting, bulkhead replacement, and re‑assembly are included, along with cautions for handling the delicate gold wires and RF connector beads. Calibration and repair strategies are described for technicians who need to restore sensor performance.
| Load impedance (HP 8481A/8482A) | 50 Ω |
|---|---|
| Load impedance (HP 8483A) | 75 Ω |
| Gold‑wire resistance (HP 8482A) | 245 ± 12.5 Ω |
| Gold‑wire resistance (HP 8483A) | 375 ± 17.5 Ω |
| Operational amplifier gain | ≈ 700 |
| Sampling square‑wave frequency | 220 Hz |
The sensors require a 50 Ω load provided by the bulkhead assembly.
The sampling frequency is a 220 Hz square wave supplied by the power meter.