Product Overview
HP 70902A IF Section Module - 10 Hz to 300 kHz Resolution Bandwidth for HP 70000 MMS
Condition
Used, sourced from an HP engineering lab that was closing down. Evaluation: Visual inspection only. Function testing not performed. Front panel markings legible: 70902A IF SECTION, RES BW 10Hz-300kHz, MADE IN USA. ACT and ERR status LEDs present. AUX OUTPUT section includes VIDEO 0-1V and IF 3MHz BNC connectors. HP Repair/Calibration sticker affixed to chassis; void-if-broken seal visible. SMA connectors labeled 21.4 MHz IN, VIDEO OUT, AUX OUT 21.4 MHz, and LIMITED IF OUT present on front panel. Light surface scratches on faceplate; no visible corrosion. Module address DIP switches, trimmer arrays, and backplane connector intact.
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Product Overview
HP 70902A is a 1/8-width IF Section module designed for the HP 70000 Modular Measurement System (MMS). It accepts a 21.4 MHz intermediate frequency signal from an RF section or external mixer and processes it through resolution bandwidth filters, log amplifiers, detection circuitry, and video filters. Resolution bandwidths span 10 Hz to 300 kHz, with outputs including a 3 MHz IF output and a 0-1V video output. The module operates as a slave within the HP 70000 MMS architecture, controlled by a system master such as the HP 70900A or 70900B Local Oscillator. It is compatible with spectrum analyzer and lightwave signal analyzer configurations within the HP 70000 platform. Pairing the 70902A with a 70903A IF Section extends the combined resolution bandwidth range from 10 Hz to 3 MHz.
Key Features
- Resolution bandwidth range: 10 Hz to 300 kHz
- Input signal frequency: 21.4 MHz (supplied by RF section or external mixer interface)
- IF output: 3 MHz (BNC, for connection to downstream instruments)
- Video output: 0-1V (BNC)
- Module width: 1/8-width, fits HP 70000 Modular Measurement System mainframe
- Contains resolution bandwidth filters, log amplifiers, detection circuitry, and video filters
- Controlled via system master module (HP 70900A/B Local Oscillator)
- Front panel ACT and ERR status LEDs for system diagnostics
- MODULE ADDRESS DIP switches and extensive trimmer array for calibration
- MADE IN USA; labeled test points and adjustment ports accessible on top panel
Applications
- Replacing a failed or degraded IF section in an HP 70000 series spectrum analyzer - swapping the module into the mainframe slot and recalibrating to restore narrow-band resolution performance
- Expanding a partially assembled HP 70000 system in an R&D lab, where a technician needs 10 Hz to 300 kHz resolution bandwidth capability to resolve closely spaced spectral components
- Troubleshooting and refurbishing an HP 70000 system acquired as surplus - identifying the 70902A as the faulty module, sourcing a replacement, installing it, and verifying system performance before resale
- Pairing with an HP 70903A IF Section in a single MMS chassis to cover the full 10 Hz to 3 MHz resolution bandwidth range for wideband spectrum analysis
- Supporting lightwave signal analyzer configurations within the HP 70000 MMS where precise IF signal processing is required for optical measurement accuracy
Frequently Asked Questions
What mainframe does the HP 70902A require?
The 70902A is designed exclusively for the HP 70000 Modular Measurement System mainframe. It is not compatible with test systems outside the HP 70000 MMS platform.
What other modules are needed to operate the 70902A?
The 70902A requires a system master module - typically the HP 70900A or 70900B Local Oscillator - for control, and a spectrum analyzer RF section or external mixer interface module to supply the 21.4 MHz input signal.
Is this a standalone instrument?
No. The 70902A is a plug-in module and functions only when installed in an HP 70000 MMS mainframe with the required companion modules present.
Has this unit been function tested?
Function testing was not performed. The unit was evaluated by visual inspection. It was sourced from an HP engineering lab closure. Buyers should plan for incoming inspection and calibration verification before deploying in a production measurement system.
Can the 70902A cover resolution bandwidths above 300 kHz?
The 70902A covers 10 Hz to 300 kHz. Resolution bandwidths from 100 kHz to 3 MHz are covered by the HP 70903A IF Section. Installing both modules in a single HP 70000 system extends the combined range to 10 Hz to 3 MHz.
What outputs does the 70902A provide?
The front panel provides two outputs: a 3 MHz IF output (BNC) and a 0-1V video output (BNC), both in the AUX OUTPUT section. Front panel SMA connectors include 21.4 MHz IN, VIDEO OUT, AUX OUT 21.4 MHz, and LIMITED IF OUT.
HP engineering labs don't close every day, and the modules they leave behind don't surface often. The 70902A that helped someone measure the unmeasurable is ready for the next system that needs it.
