BK PRECISION 2190B Instruction 电路图.pdf

100 MHz DUAL-TRACE OSCILLOSCOPE BK PRECISION + + INSTRUCTION MANUAL MODEL 2190B BK PRECISION + RadioFans.CN 收音机爱 好者资料库 TEST INSTRUMENT SAFETY WARNING Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must often be performed where exposed high voltage is present. An electrical shock causing 10milliampsofcurrenttopassthroughtheheartwillstopmosthumanheartbeats.Voltageaslow as35volts dc or ac rms should be considered dangerous and hazardous since it can produce a lethal current under certain conditions. Higher voltage poses an even greater threat because such voltage can more easily produce a lethal current. Your normal work habits should include all accepted practices that will prevent contact with exposed high voltage, and that will steer current away from your heart in case of accidental contactwithahighvoltage.Youwillsignificantlyreducetheriskfactorifyouknowandobservethefollowing safety precautions: 1.Dont expose high voltage needlessly in the equipment under test. Remove housings and covers only when necessary. Turn off equipment while making test connections in high-voltage circuits. Discharge high-voltage capacitors after removing power. 2.If possible, familiarize yourself with the equipment being tested and the location of its high voltage points. However, remember that high voltage may appear at unexpected points in defective equipment. 3.Use an insulated floor material or a large, insulated floor mat to stand on, and an insulated work surface on which to place equipment; make certain such surfaces are not damp or wet. 4.Use the time-proven “one hand in the pocket” technique while handling an instrument probe. Be particularly careful to avoid contacting a nearby metal object that could provide a good ground return path. 5.When using a probe, touch only the insulated portion. Never touch the exposed tip portion. 6.When testing ac powered equipment, remember that acline voltage is usuallypresenton some power input circuits such as the on-off switch, fuses, power transformer, etc. any time the equipment is connected to an ac outlet, even if the equipment is turned off. 7.Some equipment with a two-wire ac power cord, including some with polarized power plugs, is the “hot chassis” type. This includes most recent television receivers and audio equipment. A plastic or wooden cabinet insulates the chassis toprotectthecustomer.Whenthecabinetisremovedforservicing,aseriousshockhazardexistsifthechassisistouched. Not only does this present a dangerous shock hazard, but damage to test instruments or the equipment under test may resultfrom connectingthe ground leadofmosttestinstruments(including this oscilloscope) to a “hot chassis”.To make measurements in “hot chassis” equipment, always connect an isolation transformer between the ac outlet and the equipment under test. The B+K Precision Model TR-110 or 1604A Isolation Transformer, or Model 1653A or 1655A AC Power Supply is suitable for most applications. To be on the safe side, treat all two wire ac powered equipment as “hot chassis” unless you are sure it has an isolated chassis or an earth ground chassis. 8.Never work alone. Someone should be nearby to render aid if necessary. Training in CPR (cardio-pulmonary resuscitation) first aid is highly recommended. RadioFans.CN 收音机爱 好者资料库 This symbol on oscilloscope means “refer to instruction manual for further precautionary information”. This symbol appears in the manual where the corresponding information is given. Instruction Manual for Model 2190B 100 MHz Dual-Trace Oscilloscope 2000 B+K Precision Corp. + 1031 Segovia Circle, Placentia, CA 92870 BK PRECISION + + RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS PagePage TEST INSTRUMENT SAFETY . . . . . . inside front cover FEATURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 CONTROLS AND INDICATORS . . . . . . . . . . . . . . . . . . 7 General Function Controls. . . . . . . . . . . . . . . . . . . . . . 7 Vertical Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Horizontal Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Triggering Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Rear Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . 10 OPERATING INSTRUCTIONS. . . . . . . . . . . . . . . . . . . 11 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Equipment Protection Precautions. . . . . . . . . . . . . . . 11 Operating Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Initial Starting Procedure . . . . . . . . . . . . . . . . . . . . . . 12 Single Trace Display . . . . . . . . . . . . . . . . . . . . . . . . . 12 Dual Trace Display. . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Triggering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Magnified Sweep Operation . . . . . . . . . . . . . . . . . . . 15 OPERATING INSTRUCTIONS (Continued) XY Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Video Signal Observation . . . . . . . . . . . . . . . . . . . . . 15 Delayed Sweep Operation. . . . . . . . . . . . . . . . . . . . . 15 Applications Guidebook . . . . . . . . . . . . . . . . . . . . . . 16 MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Line Voltage Selection. . . . . . . . . . . . . . . . . . . . . . . . 17 PeriodicAdjustments. . . . . . . . . . . . . . . . . . . . . . . . . 17 Calibration Check . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Instrument Repair Service. . . . . . . . . . . . . . . . . . . . . 18 APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Important Considerations for Rise Time and Fall Time Measurements . . . . . . . . . . . . . . . . . . . . 19 Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 “Guidebook To Oscilloscopes” Availability . . . . . . . . . . . . . . . . . . . . . inside back cover 2 FEATURES LOW COST,HIGH PERFORMANCE B+K PrecisionModel 2190B isoneof themost economi- cal 100 MHz analog oscilloscopes on the market, yet it has all of the high performance features needed for most appli- cations,includingdelayedtimebase,bandwidthlimiter,and Y axis output. This oscilloscope is built by and backed by B+K Precision, a company that has been selling reliable, durable, value priced test instruments for over 50 years. CRT FEATURES Rectangular CRT RectangularCRTwithlarge8x10centimeterviewing area. Convenience Tracerotation electricallyadjustablefrom front panel. 0%, 10%, 90%, and 100% markersfor rise timemeas- urements. DUAL TRACE FEATURES Dual Trace Model 2190B has two vertical input channels for dis- playing two waveforms simultaneously. Selectable single trace (either CH 1 or CH 2) or dual trace. Alternate or chop sweep selectable at all sweep rates. Sum and Difference Capability Permits algebraic addition or subtraction of channel 1 and channel 2 waveforms, displayed as a single trace. Useful for differentialvoltage and distortion measure- ments. HIGH FREQUENCY FEATURES Wide Bandwidth Conservatively-rated 3 dB bandwidth is dc to 100 MHz. Fast Rise Time Rise time is less than 3.5 ns. Fast Sweep Maximum sweep speed of 2 ns/div (with X10 MAG) assureshigh frequenciesand short-duration pulses are displayed with high resolution. VERTICAL FEATURES High Sensitivity 5 mV/div sensitivity for full bandwidth. High-sen- sitivity 1 mV/div and 2 mV/div using PULL X5 gain control. Calibrated Voltage Measurements Accurate voltage measurements (3%) on 10 cali- brated ranges from 5 mV/div to 5 V/ div. Vertical gain fully adjustable between calibrated ranges. SWEEP FEATURES Calibrated Time Measurements Accurate (3%) time measurements. The main sweep has 23 calibrated ranges from 0.5 S/div to 20 nS/div. The delayed sweep also has 23 calibrated ranges from 0.5 S/div to 20 nS/div. Sweep time is fully adjustable between calibrated ranges. X10 Sweep Magnification Allows closer examination of waveforms, increases maximum sweep rate to 2 nS/div. DUAL TIME BASE FEATURES Dual Sweep Generators Main sweep gives normal waveform display, delayed sweepmaybeoperatedatfastersweepspeedtoexpand a portion of the waveform. Four Sweep Modes Choice of main sweep only, delayed sweep only, main sweep and delayed sweep sharing the trace (percentage of main/delayed sweep adjustable), or XY. Adjustable Start Of Delayed Sweep DELAY TIME POSition control allows adjustment of delayed sweep starting point. TRIGGERING FEATURES Two Trigger Modes Selectable normal (triggered) or automatic sweep modes. Triggered Sweep Sweepremains atrestunlessadequatetriggersignalis applied. Fully adjustable trigger level and (+) or () slope. 3 AUTO Sweep Selectable AUTO sweep provides sweep without trig- ger input, automatically reverts to triggered sweep operation when adequate trigger is applied. Five Trigger Sources Five trigger source selections, including CH 1, CH 2, alternate, EXT, and LINE. Video Sync Frame(TVV)orLine(TVH)triggeringselectablefor observingcompositevideowaveforms.TV-Hposition can also be used as low frequency reject and TV-V position can be used as high frequency reject. Variable Holdoff Trigger inhibit period after end of sweep adjustable. Permits stable observation of complex pulse trains. OTHER FEATURES Bandwidth Limiter Selectablefullbandwidthof100mHzorlimitedband- width of 20 MHz to filter high frequency noise from low frequency waveforms. XY Operation Channel 1 can be applied as horizontal deflection (X-axis) while channel 2 provides vertical deflection (Y-axis). Built-in Probe Adjust Square Wave A2Vp-p,1kHzsquarewavegeneratorpermitsprobe compensation adjustment. Channel 2 (Y) Output A buffered 50 output of the channel 2 signal is available at the rear panel for driving a frequency counter or other instruments. The output is 50 mV/div (nominal) into 50. Z-Axis Input Rear panel Z-Axis input allows intensity modulation. Supplied With Two Probes FEATURES 4 SPECIFICATIONS CRT: Type: 6-inch rectangular with integral graticule, P31 phosphor. DisplayArea: 8 x 10 div (1 div = 1 cm). AcceleratingVoltage: 12 kV. Phosphor: P31. Trace Rotation: Electrical, front panel adjustable. VERTICAL AMPLIFIERS (CH 1 and CH 2) Sensitivity: 5 mV/div to 5 V/div, 1 mv/div to 1 V/div at X5 MAG. Attenuator: 10 calibrated steps in 1-2-5 sequence. Vernier control provides fully adjustable sensitivity between steps; range 1/1 to at least 1/3. Accuracy: 3%, 5 mV to 5 V/div; 5%, at X5 MAG. Input Resistance: 1 M 2%. Input Capacitance: 25 pF 10 pF. Frequency Response: 5 mV/div to 5 V/div: DC to 100 MHz (3 dB). X5 MAG: DC to 25 MHz (3 dB). Rise Time: 3.5 nS. Overshoot: Less than 5%. Operating Modes: CH 1:CH 1, single trace. CH 2:CH 2, single trace. DUAL:CH 1 and CH 2, dual trace. Alternate or Chop selectable at any sweep rate. ADD:Algebraic sum of CH 1 + CH 2. Chop Frequency: Approximately 500 kHz. Polarity Reversal: CH 2 invert. Maximum Input Voltage: 400 V (dc + ac peak). HORIZONTAL AMPLIFIER (Input through channel 1 input) XY mode: CH 1 = X axis. CH 2 = Y axis. Sensitivity: Same as vertical channel 2. Input Impedance: Same as vertical channel 2. Frequency Response: DC to 2 MHz (3 dB). X-Y Phase Difference: 3 or less at 100 kHz. Maximum Input Voltage: Same as vertical channel 1. SWEEP SYSTEM Operating Modes: Main, Mix (both main and delayed sweep displayed), Delay (only delayed sweep displayed), XY. Main Time Base: 20 nS/div to 0.5 S/div in 1-2-5 sequence, 23 steps. Vernier control provides fully adjustable sweep time between steps. Delayed TimeBase: 20 nS/div to 0.5 S/div in 1-2-5 sequence, 23 steps. Accuracy: 3%. Sweep Magnification: X10 10%. Holdoff: Continuously adjustable for main time base from NORM to 5 times normal. Delay TimePosition: Control sets percentage of display that is devoted to main and delayed sweep. Delay Jitter: 1/10,000 of full scale sweep time. TRIGGERING Trigger Modes: AUTO (free run), NORM, TV-V, TV-H. Trigger Source: CH 1, CH 2, Alternate, EXT, LINE. Slope: (+) or (). 5 Trigger Coupling: AUTO:Sweep free-runs in absence of suitable trigger signal. NORM:Sweep triggered only by adequate trigger signal. TV-V:Video vertical sync pulses are selected. Also usable for high frequency reject. TV-H:Video horizontal sync pulses are selected. Also usable for low frequency reject. Trigger Sensitivity: AC:1.5 div (internal) 0.5 Vp-p (external) 30 Hz 110 MHz TV-V:1.0 div (internal) 0.5 Vp-p (external) 20 Hz 30 kHz) TV-H:1.0 div (internal) 0.5 Vp-p (external) 3 kHz 100 kHz Maximum External TriggerVoltage: 300 V (dc + ac peak). OTHER SPECIFICATIONS Cal/Probe Compensation Voltage: 2 V p-p 3% square wave, 1 kHz nominal. CH 2 (Y) Output: OutputVoltage: 50 mV/div (nominal into 50 ohm load). Output Impedance: Approximately 50 ohms. Frequency Response: 20Hzto100MHz,3dB. Intensity Modulation Input Signal: TTL level, intensity increasing with more positive levels, decreased intensity with more negative levels. Input Impedance: Approximately 50 k. Usable Frequency Range: DC to 5 MHz. Maximum Input Voltage: 30 V (dc + ac peak). Power Requirements: 100130 VAC or 200260 VAC, 50/60 Hz, 55 watts. Dimensions (H 3 W 3 D): 5.2 3 12.8 3 15.7 (132 3 324 3 398 mm). Weight: 18.8 lbs (8.5 kg). Environment: Within Specified Accuracy: +10 to +35 C, 1080% relative humidity. Full Operation: 0 to +50 C, 1080% relative humidity. Storage: 30 to +70 C, 1090% relative humidity. ACCESSORIES SUPPLIED: Two Switchable X1/X10 Probes. Instruction Manual. AC Line Cord. SPECIFICATIONS 6 CONTROLS AND INDICATORS GENERAL FUNCTION CONTROLS 1.ON Indicator. Lights when oscilloscope is “on”. 2.POWER Pushbutton. Turns oscilloscope “on” and “off”. 3.INTENSITY Control. Adjusts brightness of trace. 4.TRACE ROTATION Control. Adjusts to maintain trace at a horizontal position. 5.FOCUS Control. Adjusts trace focus. 6.20 MHz/100 MHz Pushbutton. When released, selects 100 MHz bandwidth. When engaged, limits bandwidth to 20 MHz. 7.GNDTerminal. Oscilloscope chassis ground jack, and earth ground via three-wire ac power cord. 8.CAL Terminal. Terminal provides 2 V p-p, 1 kHz (nominal) squarewave signal. Thissignalisuseful for checking probe compensation adjustment, as well as providing a rough check of vertical calibration. VERTICAL CONTROLS 9.VERTical MODE Switch. Selects vertical display mode. Four-position lever switch with the following positions: CH1: Displays the channel 1 signal by itself. CH2/X-Y: CH2: displays the channel 2 signal by itself. X-Y: used in conjunction with the X-Y control and Trigger SOURCE switch to enable X-Y display mode. DUAL: Displaysthechannel1andchannel2signalssimul- taneously. Dual-trace mode may be either alternate or chopped sweep; see the description under