Preamble Instruments 1850A Operator'S Instruction Manual Download | Manualshive

Page: 1 / 22

background image

1
2
3
...
»

Summary of Contents for 1850A

Page 1: ... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 e 0 0 0 0 0 0 0 e 0 0 e 0 e 0 e e pREAMBLE VIINSTRUMENTS 1850A and 1855A DIFFERENTIAL AMPLIFIERS March 10 1999 PREAMBLE INSTRUMENTS Inc P O Box6118 Beaverton OR97007 0118 ...

Page 2: ...iagram 1 5 Section 2 OPERATING INSTRUCTIONS CONTROLS AND INDICATORS Front Panel 2 1 Rear Panel 2 4 New Features of 1850A and1855A 2 5 Oscilloscope Settings 2 6 Model 1850 Operation 2 7 Section 3 GENERAL OPERATING INFORMATION Getting Started 3 1 Power Connection 3 1 1855A Front Panel Operation 3 I Attenuator and Gain Operation 3 1 Comparison Voltage Operation 3 2 Differential Offset Operation 3 3 W...

Page 3: ... f oc o SELECT DCINPUTCOUPLING s CONNECT AMPLIFIER OUTPUT TO SCOPE INPUT WITH 50 OHM COAX mE LJ e l g ATTACH XCl00 PROBES 2 DO NOT ADJUST PROBE COMPENSATION THOUT FIRST REFERRING TOTHE MANUAL TRACE ON COPE USE VDIFF AND PVG TOPOSITION i PVG DI PLAYS THS VOLTAGE OF THE SIGNAL AS ff PASSES THROUGH THE SCOPE DIEPLAY CENTERLIRE RE IRRED TO THE PROIE I P CONNECT PROBE CODING LEAD TO PROBE CODE INPUT ON...

Page 4: ...00 MHz but any one of the three 3 pole bandwidthlimit filters maybe selected to reduce bandwidth to 20MHz IMHzor 100kHz to limit noise abovethe frequencyof interest 03 i 0 99 The 1850A 1855A output is carefully limited at 500mV so that the oscilloscope is not overdriven by large inputs This allows manyoscilloscopes to directly measure the settling of D Aconverters with 14 bit 60ppm precision bette...

Page 5: ...lections Input couplingcapacitor Input gate current X1 and X10 GAIN 1 ATTENUATOR Input protection DIFFERENTIAL OFFSET VDIFF MODE Differential offset range referred to input X10 GAIN I ATrENUATOR X1 GAIN 1 ATTENUATOR XI0 GAIN 10 ATTENUATOR X1 GAIN 10 ATTENUATOR XI GAIN 10 ATTENUATOR X10 probe Differential offset accuracy X10 GAIN I ATTENUATOR X1 GAIN 1 ATTENUATOR X10 GAIN 10 ATTENUATOR XI GAIN 10 A...

Page 6: ...ght Shipping Weight Specifications 1850A 1855A _15 5V Xl or Xl0 GAIN 155V Xl or Xl0 GAIN 1 55kV Xl or Xl0 GAIN 15 5V 0 05 of reading 500 V 0 to 50 C 100 tV All digits are addressable Digit carries to next decade typically 5ppm C of full scale Ovenstabilized buried Zener Appliedto inverting input and available at rear panel Sets output to zero when0 0 volts selected and in error by morethan 0 5mV t...

Page 7: ...1 4 Specifications 1850A 1855A 03110199 O O O O O O O O O O O O 0 O O O O O O 0 O O O O O O e O II O ...

Page 8: ...0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 03 10 99 Specifications 1850A 1855A ...

Page 9: ...in is not se lected AUTO ZERO momentarily sets the input coupling to OFF and determinesthe offset necessary to set the out put at 0 volts within about 25 V During this process the front panel is unresponsive When finished the input cou pling returns to its previous mode AUTO ZERO usually takes less than one second This handv feature allows the operator to DCbalance the 1850A 1855A simply by push i...

Page 10: ...ne additional option Vco comparisonvoltage The1855A generates a voltage controlled by the push but tons above and below the front panel numerical display This voltage is called the Precision Voltage Generator PVG The 1850Adoes not have a built in PVG and the user must supply a dc voltage in the range of 15 5V to 15 5Vto the rear panel OFFSET connector In Vco n mode the 1855A sPVG is connected to t...

Page 11: ...se and transient response are essentially independentof the oscilloscope s input imped ance 20MHz h A 20MHz three pole I 8dB octave filter allows the 1855A to reduceextraneous noise This filter is a pas sive LCdesign and is intended to drive a 50 ohmload Withoutthe load the filter s frequencyresponse and tran sient responseare altered I MHz The I MHz filter is of the samedesign as the 10Ml lzfilte...

Page 12: ...ATOR is se lected and the display is set to read 155 000 the PVG out put will actually be 15 5 volts Thedecimalin the display will be in the correct location to indicate the voltage at the PVG output whenno probes are attached and 1 ATTENUATOR and X1 GAINare se lected The OFFSETVOLTAGE BNC PVG output also pres ents the samevoltage used internally for differential offset whenVt t is selected Becaus...

Page 13: ...never 0 0000 is displayed if the output exceeds 500uV During warm up this results in frequent PVG autozero operation and maycause the 1855Ato seem unresponsive to other 03 10 99 commands Setting the PVGto any voltage other than 0 0000will restore normalresponse The1855Aalso performs its autozero routine wheneverthe X1or XI0 GAINbutton is pushed During this time the PVG output is momentarilyset to ...

Page 14: ...g a deflection factor of 200mV Div will bring the nonlinear portion of the 1850A 1855A s output on screen Digitizers should not expect accurate meas urements for high frequency signals from the 1850A 1855Aexceeding _ 250mV into a 50 ohmload This is equivalent to 5 divisions of deflection at 50mV div in an oscilloscope Moresensitive settings e g 100 tV div available on some oscilloscopes are perfec...

Page 15: ...r DVM operation and accuracy similar to that of the 1855A can be achieved The maximum input voltage that can be applied depends on whether the 1850Ais operated in VcoMP or VOWF mode In the VcoMPmode the maximum OFFSETVOLTAGE connector input is limited by the 1850A 1855Acommon modedynamic range In the Vowv modeit is limited by the dynamicrange of the internal Volvvamplifier Thefollowing charts will...

Page 16: ...l controls except the Precision Voltage Generator PVG display will next changeto the state in whichthey wereleft when the 1850A 1855A was last turned off The PVG display will show model number and firmware version briefly 1855 11 meansmodel 1855A firmware version 03 10 99 1 1 ThePVG display will then return to the voltage set whenthe 1850A 1855A was last turned off During warmup the 1855Amayseem s...

Page 17: ...ng Precision Voltage Generator s digits until the peakof the waveform is at the center line of the oscilloscope s display Thenumber in the Precision Voltage Generator display is the waveform s positive peakvoltage For the 1850A manually adjust the external voltage source until the top of the waveform is at center line of the oscilloscope s display Use a DVM to monitor the external voltage source T...

Page 18: ... if an accurate measurement is to be madeusing this method Byusing the 1855Ain the comparison voltage mode and the oscilloscopein a highsensitivity setting highly accurate voltage measurementscan be made ThePrecision Voltage Generator can be used as a po sition control whichallows the 1855A to operate in its linear region 03 10 99 General Operating Information 850A 1855A DIFFERENTIALOFFSET OPERATI...

Page 19: ...mostlinear region 5 The PVG will retain its voltage whenswitching be tween Vco lPand Vatvr if the voltage is less than 10 0 volts in magnitude the maximum allowed for VDwF 3 4 WHICH OFFSET MODE SHOULD BE USED Theoperations of the Comparison Vco w and Differential Offset modes VDIFF are quite similar The Comparison modeis easier to understand and has a wider range 15 5 volts vs 10 0 volts TheDiffer...

Page 20: ...scilloscopefront panel When the 1850A is controlled with the ProBusinterface an external source must be used to control the vertical trace position 03 10 99 General Operating Information 1850A11855A USING SCOPE AT GREATERTHAN50mV div e g 200mV div I knowthe input to the 1850A 1855A is a sinewave but I am seeing a squarewave on the oscilloscope This com mentis the result of the operator setting the...

Page 21: ...by a factor of two In somemeasurements the operator can take advantage of this increased gain if the problemscausedby not terminat ing the outputare fully understoodand takeninto account The 1850A 1855Amaximum output is limited to _ _I 0V whenthe output is terminated with 1 megohm 3 6 03 10 99 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 m ...

Page 22: ...he return of the productto Preamble Instruments Preamble Instruments will paythe shippingcharges for the return of the productto the customer Thiswarrantydoesnot applyto damage resulting fromthe improper useor abuse of the product Thewarrantyalso excludes anydamage resulting fromrepair or modificationsof the productwhichwerenot performed byPreamble Instruments or its authorized servicefacility Thi...

Reviews:

No comments

Related manuals for 1850A

Brand: JBL Pages: 20

Brand: dB Technologies Pages: 133

Brand: VINCENT Pages: 48

Go Wireless Series

Brand: Vernier Pages: 3

SoundTouch SA-5

Brand: Bose Pages: 8

Brand: Randall Pages: 6

Brand: Elite Acoustics Engineering Pages: 13

TubeBooster 3000

Brand: X4-TECH Pages: 16

Brand: Parasound Pages: 12

Brand: I.D. AL Pages: 8

Brand: Camco Pages: 42

Brand: Laboga Pages: 20

Brand: auna multimedia Pages: 20

Brand: NuForce Pages: 5

Brand: DV Mark Pages: 11

Class 5 H Valve Amplifier

Brand: Marshall Amplification Pages: 6

Brand: NAD Pages: 38

Brand: Vision Pages: 8

Brands by name

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Popular brands

Load more brands