COHU Electronics inc - 324 - Calibrator
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COHU Electronics inc 324
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Equipment:
324
Date:
1967
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Information
The DC Voltage Calibrator is a portable, low-impedance source of highly accurate and stable dc voltage. The instrument supplies voltages from 0.00000 to ±1111.110 volts, which are selected by a range multiplier dial and six decade dials. The range dial has nominal full-scale 10-, 100-, and 1000-volt ranges, and indicates the decimal-point placement, in the readout of the decade dials, according to the range selected. The range dial also has a zero-volt-output position. The decade dials control detented, bidirectional, make-before-break, rotary switches. Output voltages higher than 1000 volts are obtained by the use of the overrange positions marked X (marked 10 on the extreme left-hand dial) on the decade dials.
The output current capability of the instrument is 25 milliamperes nominal at all output voltage settings. The instrument is protected by an overcurrent circuit which reduces the output voltage to zero and flashes the front panel indicator if the output current exceeds the nominal 25 milliamperes. The protective circuit cycles on and off so long as the overcurrent condition exists and then resets automatically when the condition is removed.
The output of the instrument is isolated from the ac-power line and the outer case so that the output can be applied to isolated or grounded loads. The metal terminal on the front panel may be used to ground either side of the output.
2 Manuals
Service and user manual
Manual type:
Service and user manual
Pages:
40
Size:
3.2 MB
Language:
english
Revision:
Manual-ID:
15X-61
Date:
May 1967
Quality:
Scanned document, all readable.
Upload date:
March 15, 2020
MD5:
338020cb-a2d0-ec58-2e02-36451d6d0be0
Downloads:
424
Information
Serial Numbers 1-0001 through 1-0110
I GENERAL DESCRIPTION
1-1. Introduction...1-1
1-2. Physical Details...1-1
1-3. Components...1-1
1-4. Construction...1-1
1-5. Finish...1-1
1-6. Dimensions and Weight...1-2
1-7. Electrical Specifications...1-3
1-8. Accuracy...1-3
1-9. Stability...1-3
1-10. Accuracy and Stability Measurements...1-3
n OPERATION
2-1. Initial Check...2-1
2-2. Installation...2-1
2-3. Primary-Power Connection...2-1
2-4. Output Connections...2-1
2-5. Operation...2-1
2-6. Operating Controls...2-1
2-7. Overrange Dialing...2-1
2-8. Operating Procedure...2-2
2-9. Functional Check...2-2
III CIRCUIT DESCRIPTION
3-1. General Circuit Description...3-1
3-2. Detailed Circuit Description...3-2
3-3 Power Supply 3-2
3-4. Reference Voltage...3-3
3-5. Voltage Range Switching...3-3
3-6. Feedback-Decade Network...3-4
3-7. VI, V2A Control-Grid Bias...3-5
3-8. Carrier Amplifier 3-5
3-9. Wideband Amplifier and Miscellaneous Circuits...3-5
3-10. Direct-Coupled Amplifier 3-6
3-11. Output Tube...3-6
3-12. Protective Circuit...3-7
IV MAINTENANCE
4-1. Introduction...4-1
4-2. Disassembly...4-1
4-3. Parts Location...4-1
4-4. Preventive Maintenance...4-1
4-5. General Cleaning...4-1
4-6. Fan Motor...4-1
4-7. Switches...4-1
4-8. Chopper...4-1
4-9. Performance Check...4-4
4-10. Calibration...4-4
4-11. Calibration Equipment...4-4
4-12. Calibration Procedure...4-4
4-13. Troubleshooting...4-5
4-14. Localizing Trouble...4-5
4-15. Locating Faults...4-5
4-16. Internal Adjustments...4-5
4-17. DC Balance Adjustment...4-5
4-18. Protective Circuit Adjustment...4-5
4-19. Corrective Maintenance...4-6
4-20. Replacement Parts
Schematics diagram
Manual type:
Schematics diagram
Pages:
4
Size:
518.2 KB
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
March 15, 2020
MD5:
58387dcb-4032-76aa-cbc3-52ae89f4243d
Downloads:
424