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Hewlett Packard 415C Level Meter
Manufacturer:
Model:
415C
Date:
1962
Class:
Type:
SubType:

Information

1-2. The Model 415C Standing Wave Ratio Meter is a transistorized instrument designed for measuring standing wave ratios and attenuation. The instrument is essentially a high-gain Amplifier, tuned to an audio frequency, with a calibrated meter output. Specifications for this instrument are given in table 1-1. The Model 415C is calibrated to accept inputs from square-law detectors, but because of the high sensitivity and tuned Amplifier it is also, useful as a null detector for audio frequency bridges. 1-3. Normally the signal input to the Model 415C is taken from either crystal (200-ohm or 200K-ohm) or bolometer (4.3 ma or 8.7 ma) detectors. Bolometer bias is adjustable by ±10% and circuit protection prevents damage to a barretter-type bolometer if connected or disconnected while bias current is being supplied. SWR and attenuation are measured with high accuracy and resolution by expanding selected segments of the normal scales to a full scale presentation. SWR may also be measured accurately in terms of db and then converted to a swr. 1-4. This instrument is capable of portable operation when equipped with a battery. A battery for this use is available initially as Option 1 and later as a$ stock item. The Model 415C has a variable tuned Amplifier and an adjustable bandwidth (15 cps to 100 cps) to meet a variety of measurement conditions. An ac Amplifier Output is provided on the rear panel for using the Model 415C as a high-gain (140 db) tuned Amplifier. A Recorder jack on the rear panel permits operation with a dc recorder.

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Service Manual
Manual type:
Service Manual
Pages:
66
Size:
13.20 Mbytes (13836768 Bytes)
Language:
english
Revision:
Manual-ID:
01267-2
Date:
unknown
Quality:
Scanned document, all readable.
Upload date:
07 August 2015
MD5:
045667fc6254505e92b377b4477323a1
Uploader:
Gianni Guidotti
Downloads:
531

Information

Serial prefixed 218 Section Page I GENERAL INFORMATION ... 1-1 1-1. Description and Purpose . « ... 1-1 1-5. Models Covered ... 1-1 1-7. Differences Between Instruments • *1-1 1-9. Equipment Available ... 1-1 1-11. Three-Conductor Power Cable • • -1-1 II PREPARATION FOR USE ... 2-1 2-1. Initial Inspection ... 2-1 2-3. Incoming Quality Control Check . . .2-1 2-5. Rack/Bench Instructions ... <=2-1 2-.7. AC Power Source « ... . . 2-1 2-9. Installing Battery and Input Connector . . ... 2-1 2-11. Temperature Limits 2-1 2-13. Repackaging for Shipment * . o . . 2-1 III OPERATING INSTRUCTIONS ... 3-1 3-1. Introduction . . ... 3-1 3-3. Front and Rear Panel Fixtures • * «3-1 3-5. General Operating and Measurement Considerations . . .3-2 3-6. Battery Operation ... 3-2 3-12. Groundloop Currents ... 3-2 3-14. Bandwidth and Frequency Selection ... . . ° . 3-2 3-16. SWR Measuring Equipment and Techniques ... ? 3-2 3-17. Equipment Setup and Characteristics ... 3-2 3-19. Detector Probe Penetration • 6 « 3-3 3-22. Use of Crystal Detectors • • • -3-3 3-24. Checking Square-Law Response ... « 3-3 3-27. Locating Maximum or Minimum ... 3-3 3-29. Errors from Signal Source * • • 3-4 3-34. SWR Measurement Procedure . • • 3-4 3-35. General ... <> 3-4 3-37. Low SWR (1:1 to 10:1) ... .5-11 5-66. Power supply Adjust ... 5-11 5-68. Bolo Bias Meter Adjust ... .5-14 5-78. Expand-Normal Adjust ... 5-14 5-80. Performance Verification ... 5-15 5-81. General ... 5-15 5-83. Sensitivity ... 5-15 5-85. Noise ... 5-15 5-87. Frequency ... 5-15 5-89. Bandwidth . ... 5-16 5-91. Tracking Accuracy

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