Time Base 3B4

The Type 3B4 Time Base plug-in unit is designed to be used primarily with the Tektronix Type 561A Oscilloscope system; however, It can also be used with the other 560-Series systems that use 3B-Series plug-in units such as the Type 564 and Type 567. As part of an oscilloscope system, the Type 3B4 is used as an accurate time base generator or as a calibrated amplifier for externally generated deflection signals.
When used with the 567 or RM567, the 3B4 provides a time-base, but does not activate the digital readout circuitry. In the 565 or RM565, the 3B4 provides a vertical time-base for raster applications but does not provide retrace blanking.

Sweep

TIME/DIV  Switch
0.2 µsec/div to 5 sec/div in 23 steps, 1, 2, 5 sequence. The calibration accuracy (unmagnified) is ±3% from 0.2 µsec/div to 2 sec/div; ±5% at 5 sec/div.

VARIABLE Control
Uncalibrated variable time/div control. Multiplies the sweep time/div of any step of the TIME/DIV switch by a factor variable from 1 to >2.5.

POSITION Controls
Coarse horizontal positioning to position any portion of the trace to the center of the crt. The FINE control has a range of about 2 minor divisions.

MAGNIFIER Control
Provides direct readout magnification of the sweep (up to 50X). The magnifier also provides the 0.05 and 0.1 µsec/div sweep rates. Magnified sweep accuracy, ±5% (exception: 5 sec/div). Magnified sweep registration, ±1 minor division.

+ GATE OUT Connector
Provides a +20-volt (±15%) output pulse during sweep time.

Sweep Length
10.5 ±0.3 major division.


Sweep Amplifier (when used as an external horizontal amplifier)

HORIZONTAL VOLTS/DIV Switch
Calibrated volts/div steps of 0.2, 0.5, 1, 2, and 5 volts/div. Accuracy ±3% when calibrated to match the oscilloscope in which used. The amplifier is dc coupled to the EXT HORIZ IN connector.

VARIABLE Control
Multiplies volts/div of any step by a factor  variable from 1 to >2.5.

EXT HORIZ IN Connector
Input R and C is typically 1 megΩ shunted by 40 pf.

Frequency Response
Dc to 400 kc. Response <30% down at  400 kc with the VARIABLE control set to CALIB position.

Maximum Input Voltage
±20 volts dc, or 20 volts peak ac.

Construction Aluminum-alloy chassis with chrome-plated
side rails. Front panel is photo-etched and anodized.

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