Equipment information

Dumont Oscilloscope Laboratories Inc. 304AR Oscilloscope
Manufacturer:
Model:
304AR
Date:
Category:
Group:
Description:
CATHODE-RAY OSCILLOGRAPH

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INTRODUCTION The Du Mont Type 304-A is a general-purpose cathode-ray oscillograph that enables rapid, accurate amplitude measurements of any portion of a 0-to 1000-volt signal, from d-c to over 50,000 cps.. The high gain assures that the Type 304-A can be used directly with most transducers, while d-c amplification provides that the lowest frequency portions of signals will be faithfully reproduced. To obtain the utmost from the Type 304-A, full advantage should be taken of the novel amplitude calibrating system of the instrument which permits signal amplitude measurements in volts directly from the screen. (See "Amplitude Calibration.") Unlike electro-mechanical devices, the Type 304-A is not restricted to rms or peak-to-peak readings of voltage, as any amplitude portion of the input signal may be measured with the instrument. Moreover, these measurements may be made in a minimum of time, qualifying the Type 304-A as a quantitative as well as a qualitative instrument. The TYPE 5ADP-Cathode-ray Tube is employed in the Type 304-A. This tube is precision-built to tolerances far more stringent than in conventional tubes, and provides a deflection sensitivity up to twice that of conventional types, as well as a smaller spot size with no sacrifice in brilliance. The Types 304-A and 304-AR differ only in that the -Type 304-AR is designed for mounting in a standard, 19-inch relay rack. 2. PHYSICAL CHARACTERISTICS Physical specifications of both the Type 304-A and the Type 304-AR are given in convenient tabular form in Table 1-1. The Type 304-A is enclosed in a blue-gray metal cabinet complete with a convenient carrying handle. The Type 304-AR employs a standard relay rack panel, a dust cover and a bottom plate. The operating controls of both instruments are conveniently located on the front panel with vertical Amplifier controls on the left and horizontal sweep controls on the right. In both instruments a convenient terminal panel, accessible at the rear, provides direct access to the deflection plates of the cathode-ray tube. To facilitate calibration, the scale of the Type 304-A is numbered and edge illuminated, with a dimmer control provided on the front panel. Unidirectional signal amplitudes are measured with the aid of the left-hand scale, symmetrical signals with the aid of scale on the right hand. These scales make it especially convenient to photograph a trace with scale superimposed. The usual double-exposure technique is normally not necessary when employing an instrument with an illuminated scale; thus, valuable time is saved, and more accurate results are obtained. The Type 304-A is also provided with a suitable color Filter over the CRT screen to improve visual contrast. Provision is made for connection of balanced, as well as single-ended vertical input signals on the 0.1 VOLT FULL SCALE range. Balanced input may be obtained merely by disconnecting a jumper to ground from the lower Y-input terminal on the front panel.

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Service and User Manual
Manual Type:
Service and User Manual
Pages:
64
Size:
7.33 Mbytes (7680985 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
07 May 2017
MD5:
91faff993bc41a24550302086697aba0
Downloads:
963

Information

1 INTRODUCTION ... 1 2 PHYSICAL CHARACTERISTICS ... 1 3 CIRCUITRY EMPLOYED ... 3 SECTION II OPERATION 1 UNPACKING AND INSPECTING THE EQUIPMENT ... 10 2 LOCATION AND INSTALLATION ... 10 a. General ... 10 b. Line Voltage and Frequency ... 10 c. Power Regulation ... 10 3 TURNING ON THE EQUIPMENT ... 11 4 PRECAUTION AGAINST SCREEN BURNING ... 11 5 CONTROLS AND TERMINALS ... 11 a. General ... 11 b. Control and Terminal Functions . . ... 11 c. Synchronization of Sweep ... 12 d. Obtaining Low-frequency Sweeps . ... 15 e. Amplitude Calibration ... 16 f. Intensity Modulation ... 17 g. Direct Connection To Deflection Plates ... 18 6 PHOTOGRAPHING OSCILLOGRAMS ... 19 7 USE OF BALANCED INPUT ... . 20 SECTION III THEORY OF OPERATION 1 GENERAL ... 22 2 CATHODE-RAY TUBE CIRCUIT ... 22 a. General ... 22 b. Intensity ... 23 c. Focus ... . . ... 23 d. Intensity Modulation ... 23 3 VERTICAL DEFLECTION CIRCUIT (Y AXIS) ... 23 a. General ... 23 b. Input Attenuator ... 23 c. Voltage Calibrator ... 24 d. Vertical (Y-axis) Amplifier ... 24 4 SYNC AND SWEEP CIRCUITS ... 26 a. General ... 26 b. Synchronization ... 26 c. Recurrent Sweep ... 28 d. Driven Sweep ... 28 5 HORIZONTAL DEFLECTION CIRCUIT (X AXIS) ... 29 a. General ... 29 b. Circuit Theory ... 29 6 POWER SUPPLY ... 31 a. General ... 31 b. Functions ... 31 c. Low-Voltage Power supply ... 31 d. High-Voltage Power supply ... 31 e. Regulated Heater Supply ... ... 33 2 THEORY OF LOCALIZATION ... 33 3 CIRCUIT VOLTAGES AND RESISTANCES ... 38 4 SELECTING 115- or 230- VOLT LINE ... 40 5 FACTORY ADJUSTMENTS ... 41 a. General ... 41 b. Test Equipment Required. . ... 41 c. Factory Adjustments for Y Amplifier ... 41 d. Factory Adjustments for X Amplifier ... 48 e. Factory Adjustments for the Sweeps ... 49 g. Other Factory Adjustments ... 50 6 REPLACEMENT OF CATHODE-RAY TUBE . ... 51 a. Type 304-A ... 51 b. Type 304-AR ... 51 7 ILLUMINATED CALIBRATED SCALE ... 51 8 DU MONT "OSCILLOGRAPHER" ... 52 9 DU MONT WARRANTY ... 52 10 SERVICE ... 52

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