Introduced in 1983; see HP Journal of February 1983.

The 3468A multimeter is a low-cost HP-IL programmable instrument for service personnel and can be connected to HP-IB via 82169A HP-IL to HP-IB interface. A companion product to the 3478A with similar display and measurement features, the microprocessor-based 3468A is an autoranging, 5 1/2-to-3 1/2-digit, five-function digital multimeter […]

This model also has a lot in common with the 3457A (similar calibration data, LCD protocol, etc).

• Ranges : 300mV to 300V
• Sensitivity: 1μV
• Best accuracy: +-(0.0035% reading + 2 counts) 3V range @ 24Hr period
• Input resistance : >10GΩ on ranges up to 3V; 10MΩ +- 1% on 30V and 300V ranges

• 300kHz true RMS
• Ranges: 300mV to 300V
• Input impedance: 1MΩ shunted by < 60pF

• Ranges: 300Ω to 30MΩ
• Sensitivity: 1 mΩ
• Open-circuit voltage: 6.5V

• Ranges: 300mA, 3A
• Burden voltage : 0.1V / 1V

• Ranges: 300mA, 3A
• Burden voltage : 0.1V / 1V

The 3468A contains one main CPU (Intel i8039), but unlike the 3478A, it uses a Hybdrid A/D chip in the analog domain (1QF6-0066) controlled by the main processor, instead of a second processor.

• 3456A ROM image on eevblog forums
• BAMA ROM chip replacement information