1604-B

The General Radio 1604-B Comparison Bridge was introduced in 1954 Catalog N and remained available through Catalog O 1956.

The General Radio 1604-B Comparison Bridge was introduced in 1954 Catalog N and remained available through Catalog O 1956. The Type 1604-B was designed for sorting, adjusting and comparing two devices at three different frequencies.

Impedance difference is measured in two ranges, 5% or 20% selected by a front panel switch, using a built generator and detector equipped with a 2AP1 CRT. A balance is achieved when the vertical deflection is at a minimum.

Dissipation factor difference is read directly from the dial in one range. The main change from the 1604-A is the addition of a 400 Hz test frequency.

Specifications

• Deviation Range: Impedance difference, ±5% and ±20%, switched. Disipation factor difference, ±.006 at 400 Hz. ±.015 at 1 kHz. ±.075 at 5 kHz.
• Test Frequency: 400 Hz, 1 kHz, and 5 kHz; The frequency is within ±3% of the nominal value.
• Voltage Applied to Unknown: Approximately one volt, for impedances above 500 Ω. For lower values of impedance the voltage is decreased.

Links

• Experimenter describing Type 1604-A December 1952
• Experimenter describing Type 1604-B February 1954
• Successor: General Radio 1605-A Impedance Comparator (1956)

Photos

• 
• 
• 
• 
• 
• 
•