Equipment information

COHU Electronics inc 324 Calibrator
Manufacturer:
COHU Electronics inc
Model: 324
Date: 1967
Category: Measurement instruments
Group: Calibrator
Description: DC Voltage Calibrator
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.

These manuals are available for the above equipment:

Manual Type: Service and User Manual Cohu-12728-Manual-Page-1-Picture
Pages: 40
Size: 3.23 Mbytes (3384428 Bytes)
Language: english
Revision:
Manual-ID/Number: 15X-61
Date: 23 May 1967
Quality: Scanned document, all readable.
Upload date:
MD5: 338020cba2d0ec582e0236451d6d0be0
Downloads: 243 since 15 March 2020
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

Cohu-12728-Manual-Page-1-Picture


Manual Type: Cirquit Diagram Cohu-12729-Manual-Page-1-Picture
Pages: 4
Size: 518.18 Kbytes (530621 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date:
Quality: Scanned document, all readable.
Upload date:
MD5: 58387dcb403276aacbc352ae89f4243d
Downloads: 239 since 15 March 2020
Information:

Cohu-12729-Manual-Page-1-Picture


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