|Keithley 150B Digital Multimeter|
GENERAL The Keithley Model 150B Microvolt Ammeter is an extremely sensitive instrument which measures voltages from 0.3 microvolt to 1 volt and currents from 0.3 nanoampere to 1 mi 11iampere. It can be used as a voltmeter, null detector or an ammeter with either battery or line power operation. AS A MICROVOLTMETER. a. The Model 150B is ideal as a microvoltmeter for measuring semiconductor resistivity, thermopile and thermocouple potentials, Hall effect, contact resistances, biologically generated emf's, electrochemical potentials and strain guages emf's. b. The Model 150B has input noise less than 25 nanovolts peak-to-peak; high input resistance and low zero shift; excellent zero stability; very high 1ine-frequency rejection and common mode rejection; battery operation; zero suppression; special low-thermal input circuitry; two available outputs. c. With these features, the Model 150B permits excellent resolution; maintains measurement accuracy even from high resistance sources; is ideal for long-term measurements; detects dc signals in the presence of large ac voltages and is virtually insensitive to ac or dc voltages applied between circuit and chassis ground; disconnects from power lines for improved isolation; measures small changes in dc signals; reduces temperature and shielding problems; provides outputs where either filtering is needed or fast response or greater output power is needed. AS A NULL DETECTOR. a. As a null detector the Model 150B is excellent for use in ratio measurements and in potentiometer and bridge circuits. b. The Microvolt Ammeter's outstanding features as a null detector are: very good resolution; high line frequency and common mode rejection; isolation from chassis ground to input terminals; battery operation; high input resistance; floating capability; low zero shift; zero suppression. c. Because of these features the Model 150B has resolution comparable to the maximum usable resolution of most potentiometers and bridges; may be simply connected to the terminals of a null circuit; is very insensitive to common mode voltages developed in the null circuit; can be used in most potentiometer and bridge circuits without off-null loading; accurately detects a null regardless of the setting on most potentiometers and bridges; compensates for thermal emf's generated in the null circuit. AS AN AMMETER. a. The Model 150B has general use in research, design and production test facilities. It is useful for making low voltage drop, in-circuit measurements as well as measuring the output of radiation detectors, phototubes and other current generating transducers. b. The instrument has low voltage drop for measuring currents in very low-voltage circuits low zero drift for measuring long-term current; excellent floating capabilities for measuring ungrounded sources; and low input noise, giving excellent resolution.
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|Keithley -- 150B -- Service- und Bedienungsanleitung|
|Dokumenttyp:||Service- und Bedienungsanleitung|
|Dateigröße:||2.86 Mbytes (2994306 Bytes)|
|Datum:||01 Januar 1967|
|Qualität:||Gescanntes Dokument, teilweise schwer oder teilweise nicht zu lesen.|
|Upload Datum:||19 August 2018|
|Downloads:||111 seit dem 19 August 2018|
MODEL 150B SPECIFICATIONS ... GENERAL DESCRIPTION ... 1-1. General ... 1-2. As a Microvoltmeter ... 1-3. As a Null Detector ... 1-4. OPERATION ... 2-1. Mode of Operation ... 2-2. Battery Operation ... 2-3. Microvolt and Null Detector Operating Procedures ... 2-4. Ammeter Operating Procedures ... 2-5. Zero Suppress Operation. . . 2-6. 2-7. Recorder Outputs ... 2-8. Synchronizing Terminals. . . 2-9. Differential (Floating) 2-10. Accuracy Consideration . . . 2-11. Thermal Noise ... . . 2-12. Input Resistance ... 2-13. Thermal Emf 1 s ... . 2-14. Shielding ... 2-15. Operating From Source Other Than 117 Volts, 60 cps . . . 2-16. Accessories For Input .Connections ... CIRCUIT DESCRIPTION ... 3-1. General. ... ... 3-2. 3-3. AC Amplifier ... 3-4. Demodulator ... 3-5. 3-6. Zero Suppression ... 3-7. 3-8. Battery Charging Circuit . . 4. MAINTENANCE ... 4-1. 4-2. Parts Replacement. ... 4-3. Mechanical Chopper Replacement ... 4 -4. Troubleshooting ... 4-5. Preliminary Troubleshooting Procedures ... 4-6. Check Out and Calibration Procedures ... 4-7. Power Supply Check Out and Calibration ... 4-8. Amplifier Check Out and Calibration ... 5. ACCESSORIES ... 5-1. Model 4006 Rack Mounting.Kit ... 5-2. Model 4007 Dual Rack 5-3. Model 370 Recorder ... 6. REPLACEABLE PARTS ... 6-1. Replaceable Parts List . , 6-2. How to Order Parts ... Model 150B Replaceable Parts List . ... Models 1483, 1484 Replaceable Parts List . . Schematic Diagram 20350E . Schematic Diagram 20357D . * Change Notice Last
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