Overview The Hewlett-Packard 400C is a precision AC vacuum tube voltmeter (VTVM) introduced around 1949 as an improved successor to the earlier HP 400A series. The instrument was designed for laboratory, communications, and electronic service applications requiring accurate wide-band AC … Continue reading →

Overview The HP AC-60A Line Matching Transformer was an accessory produced by Hewlett-Packard for use with audio and measurement equipment. It was designed to provide impedance matching and signal isolation between different pieces of equipment, particularly in laboratory and test … Continue reading →

Option 001 – FM Deviation, 0 to 110 kHz. AM 0 to 30% Option 002 – FM Deviation  0 to 30 kHz. AM 0 to 30% Option 003 – Reduces the external FM sensitivity to 100 kHz/volt+/1 5%, high range … Continue reading →

The 105B Quartz Oscillator is a light and compact precision quartz oscillator for frequency and time standards. The 105B also has an internal sealed-cell nickel-cadmium battery that can provide up to 8 hours of standby power if AC line power … Continue reading →