The Hewlett-Packard 3325A is an HP-IB synthesizer/function generator (1uHz to 21MHz) with 11-digit resolution. My unit has options 1 and 2 installed (high-stability oscillator and high-voltage output).
Pictures ↵ ^ HP 3325A (front view)
This unit appears to have been used at the Indiana Standards Lab in the United States. Whoever calibrated this unit last did a fine job — it's still perfect 9 years after its last calibration, hats off!
HP 3325A (back view)
The output of the internal high-stability 10MHz reference is linked to the external reference input. The signal output on the back panel is disabled on units with the high-voltage option (2).
HP 3325A (inside view, top) HP 3325A (inside view, bottom) HP 3325A OCXO close-up
The OCXO board is powered from the 3325A's power supply and outputs 10MHz onto the external BNC connector on the back panel. To use this as the 3325A's reference, the output BNC must be externally connected to the external reference input BNC. The OCXO is a 10.0MHz Ovenaire OSC 73-52.
HP 3325A nanoprocessor close-up
HP 3325A fan close-up
The fan is an ETRI 126LF-2182, rated for 115V AC 50/60Hz 130/100mA 2750/3250rpm 27/32cfm 30/35dBA. The fan uses sleeve bearings and has a single piece die-cast casing made of zinc alloy.
Documents ↵ ^ Links ↵ ^
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