Equipment information

Boonton Electronic 250-A Level Meter
Manufacturer:
Model:
250-A
Date:
Category:
Group:
Description:
RX Meter

Information

The RX Meter Type 250-A is a wide frequency range Impedance Meter designed to permit accurate individual determination of the equivalent parallel resistance and parallel reactance of two- terminal networks and components. The instrument is completely self-contained and consists,* fundamentally, of a refined Schering bridge circuit, together with its associated oscillator, detector, amplifier, null detector and Power supply. Bridge balance is obtained by means of two calibrated dials which indicate, respectively, parallel resistance and parallel capacitance of the unknown. B. SPECIFICATIONS 1. FREQUENCY RANGE: 0. 5 me to 250 me. 2. RESISTANCE MEASUREMENTS: a. Range: 15 ohms to 100,000 ohms. (Values from 0 to 1512 maybe measured indirectly.) b. Accuracy: / ^ Rp Q ± 12 + ---- + ------ + — j % ± 0. 2 ohms v 200 5000 20/ where f = frequency in megacycles R„ - equivalent parallel resistance in. ohms indicated by RX Meter Rp Q ------- Xp as determined from RX Meter readings. 3. CAPACITANCE MEASUREMENTS: a. Range: 0 to 20 mmf. (May be extended to 120 mmf by use of auxiliary resonating coils.) b. Accuracy:±(0.5 ^ 0.5F2 *C*x 10-5)% ±-0.15/ifrf *F = frequency (MC); C = RX Meter Cp reading (^f) where f - frequency in megacycles. 4. INDUCTANCE MEASUREMENTS: a. Range: Inductance values which will resonate with capacitance from 0.1 mmf to 100 mmf over the frequency range of the instrument. By the use of auxiliary series resistors or capacitors, values of inductance maybe measured over the following ranges. Freq. Minimum Maximum 0.5 me 0* Ol^h 100 mh 250 me O.OOljuh 0.4 mh 5. VOLTAGE AT TEST TERMINALS: DC voltage = 0. (DC up to 50 ma. may be passed thru the terminals from external source.) RF voltage = approximately 0.1 to 0.5 volts. 6. POWER REQUIREMENTS: Voltage, 105-125 volts? frequency, 50-60 cps, power consumption,60 watts. (Voltage internally regulated.)

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Service and User Manual
Manual Type:
Service and User Manual
Pages:
36
Size:
3.15 Mbytes (3298001 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2017 01 22
MD5:
86534b3d227737993e463036f8b9b96a
Downloads:
530

Information

I. Description A. General 7 B. Specifications 7 C. Front Panel Controls & Indicators 7 D. Measuring Terminals 8 E. Application 8 II. Operation A, Preparation for Use 9 B„ Preliminary Procedure 9 C. Measurement Procedure 9 III. Interpretation of Results A. Significance of Dial Readings 10 B. Extension of Results 10 C. Sources of Error 10 IV. Theory of Operation A» Overall Operation 12 B. The Bridge Circuit 12 C. The Oscillator Unit 13 D. Mixer Stage 14 E. Amplifier 14 F. Power supply 14 V. Maintenance & Adjustment A, Trouble Shooting 14 1. Removal from Cabinet 14 2, Trouble Shooting Chart 15 B, Adjustments 1. Bridge Trimmer Adjustment 16 2, Reduction of Signal Level 16 Appendix A. Extension of Ranges 1. Low Resistance 18 2. Low Inductance 18 3. High Capacitance 19 Appendix B. Installation and Use of Co-ax Adapter Type 515-A X. Specifications 2. Equipment Supplied 3. Installation Procedure 4. Preliminary Adjustment of EX Meter with Adapter Installed 5. Application a. Remote Measurements b. Transmission Line Characteristics 6. Normal Measurements with Adapter Plate in Place Appendix C. Special Applications 1. Coaxial Transmission Line 22 Characteristics 2» Balanced Transmission Line 24 Characterists 3. Vacuum Tube Input Impedance 25 4. Measurement of non-Linear 25 Impedances 5. Use as Harmonic Analyzer 26 6. Method of Applying DC Bias 26

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