TM 11-6625-1614-15 DEPARTMENT OF THE ARMY TECHNICAL MANUAL ORGANIZATIONAL, DS, GS, AND DEPOT MAINTENANCE MANUAL HEWLETT-PACKARD ELECTRONIC VOLTMETER MODEL 410C This copy pages IS from HEADQUARTERS, a reprint Change which includes current 1.
TM 11-6625-1614-15 WARNING DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT Be careful when working on the power supplies and their circuits, or on the 115- or 230-volt ac line connections.
This manual contains copyrighted material prepared by the Hewlett-Packard Co. TM 11-6625-1614-15 TECHNICAL MANUAL No. 11-6625-1614-15) HEADQUARTERS DEPARTMENT OF THE ARMY W A S H I N G T O N , DC, 28 August 1 9 6 7 ORGANIZATIONAL, DS, GS, AND DEPOT MAINTENANCE MANUAL HEWLETT–PACKARD ELECTRONIC VOLTMETER MODEL 410C (NSN 6625-00-969-4105) Page Section I II III IV V GENERAL 1-A.1. 1-A.2. 1-A.3. 1-A.4. 1-A.5. 1-A.6. 1-1. 1-4.
TM 11-6625-1614-15 Page Section 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 - 7 9 1 1 1 1 2 2 2 2 2 3 3 3 3 3 3 4 4 . . 0 3 6 7 1 2 6 8 9 0 1 3 4 5 6 5 8 . . . . . . . . . . . . . . . . .
TM 11-6625-1614-15 Page Number 4-4. 4-5. 4-6. 5-1. 5-2. 5-3. 5-4. 5-5. 5-6. 5-6.1 5-7. 5-8. 5-9. 5-10. 5-11. 5-12. 5-13. 5-14. 4-4 4-5 4-6 5-1 5-3 5-5 5-6 5-14 5-15 5-16.
o d e l 4 1 0 C TM 11-6625-1614-15 M 1 - 0 Section I Figure 1-1 Figure 1-1.
TM 11-6625-1614-15 SECTION I GENERAL INFORMATION 1-A.1. Scope a. This manual includes installation and operation instructions and covers operator’s, organizational, direct support (DS), general support (GS), and depot maintenance. It describes Hewlett-Packard (Federal supply code 28480) Electronic Voltmeter Model 410C. This manual applies to equipments with serial numbers prefixed by 433 and serial number 532-03701 and higher.
TM 11-6625-1614-15 Model 410C Section I Table 1-1 Table 1-1.
TM 11-6625-1614-15 Model 410C 1-1. DESCRIPTION. 1-2. The Hewlett-Packard Model 4l0C Electronic Voltmeter can be used to measure DC voltage and DC current; AC voltage and resistance. Positive and negative DC voltages from 10 millivolts to 1500 volts and positive and negative DC currents from 1.5 microamperes to 150 milliamperes can be measured full scale. Resistance from 10 ohms to 10 megohms full scale can be measured with an accuracy of ±5% of reading at midscale; resistance from 0.
TM 11-6625-1614-15 Model 410C 1-4. ACCESORIES AVAILABLE . 1-5. MODEL 11036A AC PROBE. This accessory, when used with the Model 410C, permits AC voltage measurements from 0.5 volt rms to 300 volts rms, full scale over a frequency range of 20 cps to 700 Mc. Reference calibration accuracy at 400 cps (sinusoidal) is ±3% of full scale. Frequency response is ±10% from 20 cps to 700 Mc, with indications obtainable to 3000 Mc. Frequency response at 100 Mc is within ±2%.
Model 410C TM 11-6625-1614-15 Section II Figures 2-l and 2-2 Figure 2-1. The Combining Case Figure 2-0 2-2.
TM 11-6625-1614-15 Section II Paragraphs 2-1 to 2-13 Model 410C SECTION II INSTALLATION . 2-1. INSPECTION. 2-9. THREE-CONDUCTOR POWER CABLE. 2-2. ‘This instrument was carefully inspected both 2-10. To protect operating personnel, the National mechanically and electrically, before shipment. It should be physically free of mars or scratches and in perfect electrical order upon receipt. To confirm this, the instrument should be inspected for physical damage in transit.
TM 11-6625-1614-15 Section II Paragraph 2-14 to 2-15 Model 410C DO NOT CHANGE THE SETTING OF THE LINE VOLTAGE SWITCH WHEN THE VOLTMETER IS OPERATING. 2-14. REPACKAGING FOR SHIPMENT. 2-15. The following paragraphs contain a general guide for repackaging of the instrument for shipment. Refer to Paragraph 2-16 if the original container is to be used: 2-17 if it is not. 2-16. If the original container is to be used, proceed as follows: a. Place instrument in original container if available. Figure 2-4.
TM 11-6625-1614-15 Section III Paragraph 3-1 to 3-18 Model 410C SECTION III OPERATION 3-13. AC VOLTAGE MEASUREMENT (Figure 3-4). 3-1. INTRODUCTION. 3-2. The Model 410C is used to measure AC and DC voltage, DC current, and resistance. All measurement inputs are located on the front panel; a DC output connector is located on the rear panel. Front panel controls and indicators are color coded.
TM 11-6625-1614-15 Model 410C Section III Figure 3-1 1. FUNCTION SELECTOR: This control is used for selecting type of measurement to be made. They are: ±DC Voltage, ±DC Current, AC Voltage, and resistance measurements. 2. AC ZERO: This control provides adjustment for zero-setting the meter before making AC voltage measurements. 3. MECHANICAL ZERO ADJUST: This adjustment mechanically zero-sets the meter prior to turning on Voltmeter. 4. RANGE: This control selects the full scale meter range. 8.
TM 11-6625-1614-15 Section III Paragraphs 3-19 to 3-27 and Table 3-1 Model 410C second maY be made without loss of accuracy by removing the. plastic nose on the Model 11036A and using in its place a 0.25 microfarad blocking capacitor in series with the exposed contact of the probe. THE GRAY INSULATING MATERIAL AROUND THE AC PROBE IS POLYSTYRENE, A LOW-MELTING POINT MATERIAL. IT IS NOT POSSIBLE TO SOLDER TO THE CONTACT WHICH IS EXPOSED WITH THE PROBE NOSE IS REMOVED WITHOUT DESTROYING THE POLYSTYRENE.
TM 11-6625-1614-15 Model 410C Section III Paragraphs 3-28 to 3-34 PRF is the pulse repetition frequency in pulses per second (pps). 3-28. NEGATIVE PULSES. 3-29. In the case of a 10 microsecond negative pulse Suppose, for example: t t 1 2 = 10 microseconds = 990 microseconds (t t2) and a pulse repetition frequency (PRF) t of 1000 pps, l would be 990 microseconds. Thus T o/ 1 would be approximately 0, and from the graph it is seen that K is approximately 0.
TM 11-6625-1614-15 Section III Figure 3-2 Model 410C Figure 3-2.
TM 11-6625-1614-15 Section III Figure 3-3 Model 410C Figure 3-3.
TM 11-6625-1614-15 Model 410C Section III Model 410C Figure 3-4.
TM 11-6625-1614-15 Section III Figure 3-5 3-8 Model 410C Figure 3-5.
TM 11-6625-1614-15 Section III Figure 3-6 Model 410C Figure 3-6.
TM 11-6625-1614-15 Section III Figure 3-7 Model 410C Figure 3-7.
TM 11-6625-1614-15 Model 410C Section III Figure 3-8 Figure 3-8.
TM 11-6625-1614-15 Model 410C Section IV Figure 4-1 and 4-2 Figure 4-1. Block Diagram, Model 410C Figure 4-2.
TM 11-6625-1614-15 Model 410C Section IV Paragraph 4-1 to 4-18 SECTION IV THEORY OF OPERATION 4-1. OVERALL DESCRIPTION. 4-2. The modulator circuit. A in Figure Model 410C includes an input network, a - amplifier- demodulator, and a meter block diagram of the Model 410C is shown 4-1. 4-3. Signals to be measured are applied through the appropriate input lead to the input network. AC voltages are detected in the AC probe, and therefore all signals to the input network are DC.
TM 11-6625-1614-15 Model 410C Section IV Paragraphs 4-19 to 4-31 voltage or current being measured) to the neon-photoconductor chopper. Also applied to the opposite side of the chopper is the amplifier feedback voltage, which is of the same polarity and approximately 5 microvolts lower in amplitude than the input voltage. The modulator-chopper consists of two photoconductors, A4V1 and A4V2, which are alternately illuminated by two neon lamps, A4DS1 and A4DS2, respectively.
Model 410C 01556-2 TM 11-6625-1614-15 Section IV Figure 4-3 Figure 4-3.
TM 11-6625-1614-15 Section IV Figure 4-4 4-4 Model 410C Figure 4-4.
01556-2 TM 11-6625-1614-15 Section IV Figure 4-5 Figure 4-5.
TM 11-6625-1614-15 - 6 Section IV Figure 4-6 4 Model 410C Figure 4-6.
TM 11-6625-1614-15 Model 410C Section V Table 5-1 Table 5-1. Instrument Type Recommended Test Equipment Required Characteristics Recommended Model Use Voltmeter Calibrator Range: .015 to 300 v Frequency: DC and 400 cps Accuracy: +0. 370 AC *O. 2%0 DC AC and DC Accuracy Checks and Calibration Adjustments @ Model 738BR Voltmeter Calibrator DC Power Supp Iy Range: O to 10 v continuous DC Ammeter Accuracy Checks @Model 723A DC Power supply DC Voltmeter Range: 10 v Accuracy: +0.
TM 11-6625-1614-15 Section V Paragraphs 5-1 to 5-11 Model 410C SECTION V MAINTENANCE 5-1. INTRODUCTION. 5-9. Mechanical METER ZERO. 5-2. This section contains maintenance procedures for the Model 410C Electronic Voltmeter. a. Turn instrument on. minute warm-up period. Allow at least a 20 5-3. TEST EQUIPMENT REQUIRED. 5-4. The test equipment required to maintain and adjust the Model 410C is listed in Table 5-1. Equipment having similar characteristics may be substituted for items listed. 5-5.
TM 11-6625-1614-15 Section V Paragraphs 5-12 to 5-15 Table 5-2 Model 410C Table 5-2. DCV Accuracy Test Voltmeter Calibrator Model 738B Settings Model 410C Range Settings Range Model 410C Meter Readings Voltage .015V 1. 5-5 .015 .01.47 to .0153 V .05V 1. 5-5 .05 .049 to .051 V .15V 1. 5-5 .15 .147 to .153 V .5V 1. 5-5 .5 .49 to .51 V 1.5V 1. 5-5 1.5 1.47 to l.53 V 5V 1. 5-5 5 4.9 to 5.l V 15 V 1. 5-5 15 14.7 to 15.3 V 50 V 1. 5-5 50 49 to 51 V 150V 1.
TM 11-6625-1614-15 Section V Tables 5-3 and 5-4 Figure 5-2 Model 410C Figure 5-2. DC Ammeter Operation Table 5-3. DCV Input Resistance Test Table 5-4.
TM 11-6625-1614-15 Model 410C Section V Paragraphs 5-16 to 5-19 Table 5-5 c. Adjust dc power supply to provide system voltmeter reading of 1.50 v. e. Model 410C should read approximately 150 ma. This will verify a R in o f a p p r o x i mately 0.3 ohms, where R 410C =E total I - R X I h. If both of these ranges function properly, it can be assumed that the remainder will also . If meter does not function properly, refer to Paragraph 5-31 for adjustment procedure. 5-17. AMPLIFIER OPERATION.
TM 11-6625-1614-15 Section V Parsgraphs 5-20 to 5-23 Figure 5-3 Model 410C . Figure 5-3. High Frequency Response Test c. Set Model 410C FUNCTION SELECTOR to +DCV ; RANGE to .015 V. c. Record voltage indicated on external dc voltmeter for use as a reference. d. Adjust voltmeter calibrator for +. 015 VDC output. d. Connect a 1.5 k ohm ±1% resistor Part No. 0730-0017) across Model 410C DC AMPLI FIER OUTPUT terminals.
TM 11-6625-1614-15 Section V Parsgraphs 5-24 to 5-25 Figure 5-4, Table 5-6 Model 410C Figure 5-4. Low Frequency Response Test AC VOLTMETER ACCURACY CHECK. a. A Voltmeter Calibrator Model 738BR) will be required for this operation. b. Adjust voltmeter calibrator for 400 cpsrms output. c. Set Model 410C FUNCTION SELECTOR to ACV; RANGE to 500 V. d. Adjust the voltmeter calibrator to settings listed in Table 5-6. Model 410C should indicate readings within limits specified. If not, refer 5-25.
TM 11-6625-1614-15 Model 410C b . Connect the Model 410C as shown in Figure 5-4. Set Model 410C FUNCTION SELECTOR toACV; RANGE to 1.5 V. c . Set frequency response test set to EXTERNAL. d . Adjust test oscillator output AMPLITUDE to provide Model 410C reading of 1.4 V; FREQUENCY to 400 cps. e . Set frequency response test set METER SET to convenient SET LEVEL. f . Vary test oscillator frequency from 20 cps to 10 Mc. Model 410C should read between 1.25 and 1.55 v at all frequencies.
TM 11-6625-1614-15 Model 410C k. Vary RF signal generator frequency from 10 Mc to 480 Mc. Model 410C should read between 0.40 to 0.50 v at all frequencies. l . If power meter pointer varies from reference determined in step j above, readjust RF signal generator OUTPUT LEVEL to return pointer to reference deflection. m . To check Model 410C frequency response from 480 Mc to 700 Mc, replace RF signal generator with VHF Signal Generator (H-P Model 612A) and repeat steps i through m above.
TM 11-6625-1614-15 b. U s e a c v o l t m e t e r t o v e r i f y M o d e l 4 1 0 C l i n e voltage of 115 v. Chopper frequency will vary with f. Observe counter, and adjust A3R5 for a chop- per frequency of 100 cps ( ±2 cps). line voltage variations. 5-29. c. Connect 410C, electronic counter, Supply Adjustment a. R e f e r t o T a b l e 5 - 7 f o r P o w e r S u p p l y c h e c k voltmeter as ahown in Figure 5-6.1. d. Set M o d e l 4 1 0 C F U N C T I O N +DCV; RANGE to 1.5 V.
TM 11-6625-1614-15 Model 410C b . Adjust DC Standard (H-P Model 740A) to apply .015 to Model 410C . c . Model 410C should read full scale. If not, adjust A6R18 for proper pointer deflection. d . Reset Model 410C RANGE to 1500 v. Adjust dc standard for 1000 v output. e . Adjust A3R30 for Model 410C reading of 985 v (1% low). f . If an error greater than ±2% of full scale exists on any range between 0.5 v and 1500 v Inclusive, select new setting for A3R30 to yield best results over these ranges.
TM 11-6625-1614-15 Model 410C b . Short OHMS and COM cables. Model 410C should read zero. c . Vary Model 410C RANGE switch through remainder of OHMS settings. should Meter should read zero, except at RX10 when meter read about 0.1 ohm (resistance of leads). d . Disconnect OHMS and COM cables. Model 410C meter should read . Checks If not, set OHMS ADJ (rear panel) for reading. reading on all OHMS RANGE settings. 5-34. AC ZERO ADJUST. a . Set Model 410C FUNCTION SELECTOR to ACV; RANGE to .
Table 5-8.
TM 11-6625-1614-15 Model 410C instrument circuitry in an effort to localize the problem. These operations should be undertaken only after it has been established that the difficulty can not be eliminated by the Adjustment and Calibration Procedures, Paragraph 5-26. An investigation should also be made to insure that the trouble is not a result of conditions external to the Model 410C. 5-38.
TM 11-6625-1614-15 Section V paragraphs 5-47 to 5-48 Figure 5-6 boards. Use caution when removing them to avoid damaging mounted components. The Part Number for the assembly is silk screened on the interior of the circuit board to identify it. Refer to Section VI for parts replacement and Part Number information 5-47. The etched circuit boards are a plated-through type. The electrical connection between sides of the board is made by a layer of metal plated through the component holes.
TM 11-6625-1614-15 Section V Table 5-9 Model 410C Table 5-9.
TM 11-6625-1614-15 Model 410C Section V Table 5-10 Figure 5-7. Table 5-10.
TM 11-6625-1614-15 Model 410C Figure 5-11. Model 11036A AC Probe (Exploded View) Figure 5-12.
5-16.1 Figure 5-6.1.
TM 11-6625-1614-15 Section V Figure 5-8 Figure 5-8.
TM 11-6625-1614-15 Figure 5-9.
By Order of the secretary of the Army: HAROLD K. JOHNSON, General, United States Army, Chief of Staff. Official: KENNETH G. WICKHAM, Major General, United States Army, The Adjutant General. Distribution: Active Army; USAMB (1) USACDCEC (.1) USACDCCEA (1) USA CDCCEA Ft Huachuca (1) NG: None. USAR: None. For explanation of abbreviations used, see AR 320-50.
THE METRIC SYSTEM AND EQUIVALENTS
PIN: 016288-000
