BK Precision 1476 Осциллограф
The B & K-Precision Model 1476
is a laboratory-quality, professional instrument for observing and measuring waveforms in electronic circuits. Dual vertical inputs are provided for simultaneous viewing of two waveforms. Low-frequency, low repetition rate waveforms are chopped at a 200 kHz rate to provide for simultaneous viewing. Alternate sweep of the two inputs permits simultaneous viewing of high-speed, high repetition rate waveforms.
The dual-trace feature, together with the 10 MHz bandwidth, wide range of sweep speeds, and high sensitivity provided, make this the ideal Oscilloscope
for a broad range of applications, including troubleshooting and repairing electronic equipment, research and development, and laboratory instruction.
DUAL TRACE Two input waveforms can be viewed either singly or simultaneously, as desired.
FULLY SOLID STATE Only the cathode ray tube uses a filament. All other stages use transistors, diodes, FET’s (field effect transistors) and IC’s.
TRIGGERED SWEEP The 1476’s stability of waveform presentations is beyond comparison with non-triggered sweep oscilloscopes. The sweeps remain at rest until triggered by the signal being observed, to assure that they are always synchronized. Fully adjustable trigger threshold allows the desired portion of the waveforms to be used for triggering. Waveforms can also be synchronized to an external sync trigger.
LARGE SCREEN The 130 mm (approx. 5.1 inches) diameter cathode ray tube gives easy-to-read presentation on an 8 x 10 cm rectangular viewing area.
CALIBRATED VOLTAGE SCALES Accurate measurement of the in stantaneous voltages on 11 different attenuator ranges for both Channel A and Channel B.
CALIBRATED SWEEP SPEED Accurate time measurements on 18 different ranges.
WIDE BANDWIDTH DC to 10 MHz bandwidth and 35 nSEC rise time assure distortion free, high resolution presentation at high frequencies.
WIDE RANGE OF Sweep speed range of 1 /xSEC/cm SWEEP SPEEDS to 0.5 SEC/cm provides every speed necessary for viewing waveforms from DC to 10 MHz.
EXPANDED SCALE A five time ifiagnification (5X) of the horizontal sweep allows closeup examination of a portion of the waveform. In addition, the 5X magnification provides a maximum sweep speed of 0.2 /zSEC/cm.
HIGH SENSITIVITY Permits the low-capacitance, high impedance, 10:1 attenuation probes to be used for virtually all measurements, thus assuring less circuit loading.
VIDEO SYNC A built-in sync separator circuit is included specifically for viewing television signals. When using VIDEO SYNC, vertical sync pulses are automatically selected at sweep times of 0.5 SEC/cm to 0.1 mSEC/cm for viewing television frames. Horizontal sync pulses are automatically selected at sweep times of 50 ^SEC/cm to 1 ^SEC/cm for viewing television lines.
VECTORSCOPE The unit may be used as a vectorscope to provide a color display exactly as specified by color television manufacturers.
CALIBRATION SOURCE A built-in calibrated 1 volt peak to-peak square wave permits checking and recalibration of the vertical amplifiers without additional equipment.
Z-AXIS INPUT Intensity modulation capability included for time or frequency markers. Compatible with TTL logic; brightness increases in logic high state, decreases in logic low state.
MECHANICAL FEATURES Carrying handle with comfortable molded fingergrip also doubles as tilt stand. Locking detent each 22-1/2° allows adjustment of viewing angle. Rear feet support Oscilloscope
in face-up position and double as cord wrap for storing power cord. Slotted bezel over face of CRT mounts standard Oscilloscope
camera for making waveform photographs.
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15 Март 2020
INTRODUCTION ... 4
FEATURES ... 4
SPECIFICATIONS ... 5
OPERATOR’S CONTROLS, INDICATORS AND FACILITIES ... 6
Initial Starting Procedure ... 9
Single-Trace Waveform Observation ... 9
Calibrated Voltage Measurement ... 10
Calibrated Time Measurement ... 11
External Horizontal Input (X-Y Operation) ... 12
Z-Axis Input ... 12
Dual-Trace Waveform Observation ... 12
Introduction ... 14
Frequency Divider Waveforms ... 14
Divide-by-8 Circuit Waveforms ... 14
Digital Circuit Time Relationships ... 14
Gated Ringing Circuit ... 14
Delay Line Tests ... 16
Servicing ... 16
Video Equipment Servicing ... 17
Introduction ... 18
Video Equipment Servicing ... 18
Signal Tracing and Peak-to-Peak Voltage Readings ... 19
Composite Video Waveform Analysis ... 19
Sync Pulse Analysis ... 19
VITS (Vertical Interval Test Signal) ... 21
Vectorscope Operation ... 23
Introduction ... 26
Importance of Sweep Alignment ... 26
Sweep Alignment Methods ... 27
Tuner Alignment ... 28
IF Alignment ... 29
Chroma Alignment ... 29
M RECEIVER ALIGNMENT ... 31
PHASE MEASUREMENT ... 31
FREQUENCY MEASUREMENT ... 33
SQUARE WAVE TESTING OF AMPLIFIERS
Introduction ... 33
Testing Procedure ... 34
Analyzing the Waveforms ... 34
General ... 38
Vertical Preamplifiers ... 38
Mode Logic ... 38
Trigger Circuit ... 38
and Inverter ... 38
Auto Sweep ... 40
1 Volt Cal Signal ... 40
Block Diagram ... 50
MAINTENANCE AND CALIBRATION ... 40
WARRANTY INSTRUCTIONS ... 43
WARRANTY ... 43