BWD Electronics 821 Oscilloscope
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The BWD 821 Oscilloscope is a remarkable instrument. It offers a 50MHz bandwidth at 5mV/div, 75MHz triggering, and incorporates a completely new MIX--MAG facility. This unique BWD feature enables both the normal x1 display and a x10 magnified display to be presented simultaneously at the turn of a knob. The magnified portion of the trace can extend from 0 to over 80% of the trace length. If the normal xlO magnifier is used with the MIX-MAG, the trace can be magnified x100 to a maximum sweep speed of approx 10nsec/div. These features, together with a 1mV/div max sensitivity, a wide range time base from 0.02jjs/div down to 2.5 sec/div and an Amplifier rise time of less than 7 nano seconds is suited to a large number of applications. It accurately displays fast digital pulses from TTL, CMOS or even ECL circuits making it suited for uprocessors, small home or business computers, video games and other digital equipments. A video sync separator with automatic change over from frame to line lock makes servicing of video cassette recorders, colour TV’s and all other video products a simple matter. the 1mV/div sensitivity vertical amplifiers can be switched to differential operation to view signals developed at any point in the circuit from the recording to the playback heads. The same features that are ideal for video work are also excellent for all audio applications, including the new digital recording techniques. An identical ECS facility with low phase shift to 200kHz is incorporated for specialist audio and telecommunication measurements. A useful feature of the video sync separator is that it will also demodulate a modulated carrier to enable the carrier envelope to be displayed. To ensure the high performance characteristics will be maintained, the BWD 821 is built to high standards of manufacture and reliability. It closely conforms to I EC 348 recommendations and other relevant standards of safety in high quality electronic test equipment.
Service and User Manual
1.96 Mbytes (2058544 Bytes)
1981 01 01
Scanned document, reading partly badly, partly not readable.
2017 06 03
SAFETY INFORMATION 1-2 PERFORMANCE SPECIFICATION Vertical Amps & Time Base 2-1 Trigger & General Details 2-2 Dimensions 2 3 FUNCTION OF CONTROLS Vertical Amplifiers 3-0 Time Base 3-1 Push Buttons & CRT Controls 3-2 Rear Panel 3-3 INSTRUMENT FAMILIARISATION Single Trace Operation 4-0 Dual Trace Operation 4-1 Time Base Operation 4-1 Horizontal Amplifier 4-2 APPLICATIONS Probe Compensation 5-1 Voltage Measurement AC 5-1 Voltage Measurement RMS 5-1 Voltage Measurement DC 5-2 Voltage Measurement AC&DC 5-3 Elimination of Common Mode 5-3 Current Measurement AC&DC 5-4 Time Measurement 5-5 Frequency Measurement 5-5 Rise & Fall Times 5-6 Time Difference 5-7 Phase Measurement 5-7 EQ Phase Measurement 5-9 Video (TV) Displays 5-9 Extending the. Usable Calibrated Amplifier Range 5-10 Page CIRCUIT DESCRIPTION Vertical Amplifiers 6-1 Beam Switch 6-2 Trigger 6-3 Time Base 6-4 Mix Mag 6-5 Horizontal Amplifier 6-6 Power Supplies 6-6 CRT & 2 Modulation 6-7 ADJUSTMENTS & MAINTENANCE Equipment Required 7-0 Power Supplies & CRT 7-1 Vertical Alignment 7-1 Attenuators 7-2 Time Base & £47 7-4 Trigger 7-5 Replacement Parts 8-0 Parts Lists 8-1 to 8-14
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