1750-A
The General Radio 1750-A Sweep Drive was introduced in Catalog O (1956) and remained available through Catalog T (1968).
The Type 1750-A sweep drive is designed to mechanically sweep an oscillator through a flexible universal coupling. The sweep action is reciprocating motion of the attached oscillator's frequency control.
Front-panel controls are available for sweep arc, sweep speed, and manual rotation. The sweep drive provides two synchronized circuits, a horizontal voltage for oscilloscope deflection, and a blanking circuit which eliminates the return trace. With the mechanical sweep and the auxiliary circuits, an oscilloscope display is possible. For every cycle of the oscillator sweep, a blanking signal and horizontal deflection voltage are created. The blanking signal is produced by a synchronized, cam-operated blanking switch. The synchronized oscilloscope horizontal voltage is produced by the oscilloscope deflection rheostat. A set of limit switches are designed to stop the sweep motor if the limits are exceeded. One limit is fixed, the other is adjustable.
A system comprising the 1750-A sweep drive, an oscillator, and oscilloscope are used to create a spectrum display for the device of interest. The device can be a filter, amplifier, network or radio receiver.
Not all oscillators are compatible with the 1750-A, check the oscillator manual for compatibility.
Specifications
- Reciprocating Output Shaft
- Center Position: adjustable within 9 turns
- Sweep Arc: adjustable from 30 to 300°C
- Torque: rated max 24 ounce-inches
- Sweep Speed: Adjustable 0.5 to 5 Hz. (Moment of inertia of load limits maxsafe speed.)
- Flexible Coupling
- Length: 5-¾ inches
- Coupling Limits: shaft diameters ¼ and ⅜ inch; knobs and dials from 1 to 4 inches
- Limit Switch: one limit fixed, the other adjustable within 9 turns
- Sweep Voltage: 2.5 V peak to peak, ungrounded
- Blanking: shorting contact closed during clockwise rotation of driven shaft; ungrounded
Links
Photos
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Oscilloscope Horizontal Rheostat
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Blanking Switch and Cam
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Sweep Limit Switch Housing
