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Operation Manual

Model 1232-A, -AP Tuned 

Amplifier & Null Detector 

PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT

VIIM-700/cover.p65

TEL:  (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988

www.ietlabs.com

534 Main Street, Westbury, NY 11590

IET LABS, INC.

© Copyright- 1992

Summary of Contents for 1232-A

Page 1: ...2 A AP Tuned Amplifier NullDetector PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT VIIM 700 cover p65 TEL 516 334 5959 800 899 8438 FAX 516 334 5988 www ietlabs com 534 Main Street Westbury NY 11590 I...

Page 2: ...standards test instru ments and calibration service we provide Combinations of functions special ranges ratings or accuracies Replacement for discontinued models from other manufacturers Calibration...

Page 3: ...T IN EXCESS OF THE MAXIMUM LIMITS INDICATED ON THE FRONT PANEL OR THE OPERATING GUIDE LABEL WARRANTY We warrant that this product is free from defects in material and workmanship and when properly use...

Page 4: ......

Page 5: ...troduction Section 1 Principles of Operation Section 2 Operation Section 3 Service and Maintenance Section 4 j IEC417 Symbol L__ on equipment signifies that the manual contains information to prevent...

Page 6: ...nal Noise 9 4 5 Transistor Voltage and Resistance Measurements 10 4 6 Trimmer Capacitor Adjustment 10 4 7 Minimum Performance Standards 11 4 8 Knobs 16 Instruction Manual Changes Specifications Page i...

Page 7: ...uces fullscale sensitivity by 40 dB Does not affect bottom 20010 of scale ATTENUATION meter switched to 20 dB Linear response with 20 dB less gain than MAX SENS Distortion filter switch in FLAT positi...

Page 8: ...r is a rigid assembly of a Type 1311 Audio Oscillator and a Type 1232 Tuned Amplifier and Null Detector The Type 1240 AP includes the Type 1232 P2 Preamplifier in addition to the above instruments The...

Page 9: ...es and a preampIifier for transducers The Type 1232 P2 Preamplifier can be added to improve the signal to noise ratio and consequently the effective sensitivity of the Type 1232 A when the latter is t...

Page 10: ...r Turns instrument on or off and controls gain Selects full gain linear 20 dB linear or logarithmic response Input terminals Pair of Type 938 Binding Output terminals Posts EXTERNAL FILTER Phone jack...

Page 11: ...amage due to large over loads by a limiter consisting of a series capacitor and two shunt silicon rectifier diodes This circuit effectively prevents signals greater than 1 volt peak to peak from reach...

Page 12: ...ks need not be tunable con ventional twin T null networks are used On the FLAT position of the range switch all filters are switched out and the frequency response is flat to within 3 dB from 20 Hz to...

Page 13: ...o damage the meter by overdriving the amplifier For null detector use the METER switch is thrown to LOG effectively compressing the upper part of the meter scale Two pairs of silicon diodes are switch...

Page 14: ...level The total range of the GAl N control is 120 dB and attenu ation in dB is roughly proportional to the rotation angle of the control knob e The OUTPUT terminals may be connected to an oscilloscope...

Page 15: ...More accurate measurements can be obtained if the amplifier is first calibrated with a constant amplitude variable frequency signal The typical variation of peak response vs frequency is shown in Figu...

Page 16: ...from damage i e equivalent to the original packaging Advice may be obtained from any GR office 4 2 REMOVAL OF COVER To open the instrument for access to transistors and components loosen the two flute...

Page 17: ...give the lowest noise levels It is possible but not likely that Q1 01 will contribute significantly to the internal noise 4 4 2 Noise From the Type 1232 P2 The equivalent noise sources of the Type 12...

Page 18: ...h impedance voltmeter 2 Before making resistance measurements remove all the batteries and short circuit anchor terminal 6 to ground Remove ail transistors Set the GAIN control to OFF the Fl LTER FREQ...

Page 19: ...32 A with published specifications at incoming inspection or following repair or calibration 4 7 2 Test Equipment The items listed in Table 3 are recommended for performance of the ensuing tests Table...

Page 20: ...See Table 4 Table 4 OSCILLATOR FREQUENCY SETTINGS Hz Hz 194 206 679 721 291 309 970 1030 388 412 1455 1545 485 515 1940 2060 Repeat the test at 100Hz 20Hz and 200Hz on the 20 200 Hz range and at 2 10...

Page 21: ...the 131 0 B adjusted to 100 mV Set the GAl N control 135 clockwise from the off position and adjust the 1455 B for a full scale reading of the 1232 A meter The 1455 B should indicate between 00320 an...

Page 22: ...100kHz 30 uV Set 1232 to 20Hz Disconnect the 1455 B and install the 874 WO at the 1232 A INPUT Adjust GAIN for 0 1 Von the voltmeter Remove the 874 WO Connect to the 1232 A input a fixture consisting...

Page 23: ...eak meter indication and beyond until the 1232 A meter again reads 3 dB below full scale The frequency indicated on 1192 should be between 10 30 and 10 50 kHz Reset the oscillator to 10kHz the 1455 B...

Page 24: ...the set screw in the bushing with respect to any panel markings c Release the set screw and pull the housing off the shaft using an Allen wrench NOTE To separate the bushing from the knob if for any...

Page 25: ...Figure 8 Bottom interior view of the Type 1232 A Figure 9 Interior of the Type 1232 P2 17...

Page 26: ...18 Figure 10 S201 wiring details The 100 series lugs are at the panel end...

Page 27: ...30 seconds im mediately following the placement of a static charge as by rubbing the outside surface This meets the requirements of ANSI standard C39 1 1972 If static charge problems occur possibly as...

Page 28: ...132 i3210 il32 3210 1132 0100 2185 1 100 2335 6450 9196 6450 1665 J 100 4205 0975 4040 6289 5628Cl 56289 07263 07263 04 713 04 713 04711 81349 81349 iH 349 81349 81349 2465 7910 0920 04009 7890 2410 2...

Page 29: ...201 DIODE RECTIFIER 1N4003 6081 1001 1lt t33 1N4003 CR 202 DIODE RECTIFIER 1Nit003 6081 1001 14433 1N4003 CR 203 DIODE RECTIFIER 1Nit003 6081 1001 1lt433 1N4003 CR 204 DIODE 1N191 90PIV IR 125UA GE 60...

Page 30: ...232 6000 5470 0650 531 0 3066 5310 3067 5260 0700 ELECTRICAL PARTS LIST 1232 2711 FMC MFGR PART NUMBER 81349 KI I5503321F 81349 RN5503321F 81349 RN55 4022F 8D49 RC 20Gl02J 81349 RN55 J5111F 8134Cl RN5...

Page 31: ...I I I I I I I J 1 11 Dt tiUIII ttor row vtt t tll J201 OUTPUT __ II _ t 0 00 It IOO u n1111 r c 01 01 101 _ tO t IN r c oe SltXI SIOO If lt DJI _ __ tN I 411 0 t Nt tO r C1 10 16 eo eoow t JOU J f11 f...

Page 32: ...he foil at the transistor socket indicates the collector lead 24 Figure 13 Etched Board Layout of the Type 1232 A Tuned Amplifier and Null Detector PI N s 1232 2700 and 1232 2710 lfJU JTP JT FtLT R T...

Page 33: ...and Null Detector r l I A T f f RIOt Rl03 II IG RlfP IOX e LEAD CONNECTS TO JI03 OF 1232 A RCE ORAINUGATE QIOI TRANSISTOR 80TT0 VIEW Figure 14 Schematic diagram and etched board layout of the Type 123...

Page 34: ...lET LABS INC Standards Decades Strobes Sound Level Meters Bridges Formerly manufactured by 534 Main Street Westbury NY 11590 GenRad TEL 16 334 5959 800 899 8438 FAX 516 334 5988 www 1etlabs com...

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