advertisement
D E P A R T M E N T O F T H E A R M Y T E C H N I C A L M A N U A L
ORGANIZATIONAL, DS, GS,
AND DEPOT MAINTENANCE MANUAL
HEWLETT-PACKARD
ELECTRONIC VOLTMETER
MODEL 410C
T h i s c o p y
I S a r e p r i n t w h i c h i n c l u d e s c u r r e n t p a g e s f r o m C h a n g e 1 .
H E A D Q U A R T E R S , D E P A R T M E N T O F T H E A R M Y
AUGUST 1967
TM 11-6625-1614-15
WARNING
DANGEROUS VOLTAGES
EXIST IN THIS EQUIPMENT
Be careful when working on the power supplies a n d t h e i r c i r c u i t s , o r o n t h e 1 1 5 - o r 2 3 0 - v o l t a c l i n e c o n n e c t i o n s .
DON’T TAKE CHANCES!
TECHNICAL MANUAL
No. 11-6625-1614-15)
This manual contains copyrighted material prepared by the Hewlett-Packard Co.
TM 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
Section
HEWLETT–PACKARD ELECTRONIC VOLTMETER
MODEL 410C
(NSN 6625-00-969-4105)
Page
GENERAL
INFORMATION -------------------------------------------------------------------------------------------
Scope --------------------------------------------------------------------------------------------------------
Index of Publications ------------------------------------------------------------------------------------
Maintenance Forms, Records, and Reports ---------------------------------------------------------
Reporting Errors and Recommending Improvements --------------------------------------------
Reporting Equipment Improvement Recommendations (EIR)---------------------------------
Administrative Storage ----------------------------------------------------------------------------------
Description -------------------------------------------------------------------------------------------------
Accessories Available ------------------------------------------------------------------------------------
1-2
1-2
1-2
INSTALLATION ----------------------------------------------------------------------------------------------------------
Inspection ---------------------------------------------------------------------------------------------------
Installation -------------------------------------------------------------------------------------------------
Rack Mounting --------------------------------------------------------------------------------------------
Three - Conductor Power Cable ----------------------------------------------------------------------
Primary Power Requirements --------------------------------------------------------------------------
Repackaging for Shipment ------------------------------------------------------------------------------
OPERATION ---------------------------------------------------------------------------------------------------------------
Introduction ------------------------------------------------------------------------------------------------
Adjustment of Mechanical Zero----------------------------------------------------------------------
Front and Rear Panel Description ---------------------------------------------------------------------
Operating Procedures ------------------------------------------------------------------------------------
DC Voltage Measurements (Figure 3-2)-------------------------------------------------------
DC Current Measurements (Figure 3-3)-------------------------------------------------------
AC Voltage Measurements (Figure 3-4) -------------------------------------------------------
Precautions When Measuring AC Voltage ----------------------------------------------------
Negative Pulses --------------------------------------------------------------------------------------------
Measuring DC Nano-Ampere Current (Figure 3-8) -----------------------------------------------
THEORY OF OPERATION ---------------------------------------------------------------------------------------------
Overall Description ---------------------------------------------------------------------------------------
Circuit Description ---------------------------------------------------------------------------------------
Input Network ---------------------------------------------------------------------------------------
Modulator - Demodulator ------------------------------------------------------------------------
The Feedback Network ----------------------------------------------------------------------------
Power Supply ----------------------------------------------------------------------------------------
MAINTENANCE ----------------------------------------------------------------------------------------------------------
Introduction -----------------------------------------------------------------------------------------------
Test Equipment Required -------------------------------------------------------------------------------
Performance Checks -------------------------------------------------------------------------------------
Change
i
ii
TM 11-6625-1614-15
Section
Alternate Voltage Source --------------------------------------------------------------------------
Mechanical Meter Zero ----------------------------------------------------------------------------
DC Voltmeter OWration --------------------------------------------------------------------------
DC Ammeter Operation ---------------------------------------------------------------------------
Ohmmeter Operation ------------------------------------------------------------------------------
Amplifier Operation --------------------------------------------------------------------------------
DC Amplifier Output Impedance Check -------------------------------------------------------
AC Voltmeter Operation --------------------------------------------------------------------------
Adjustment and Calibration Prmedure --------------------------------------------------------------
Chopper Frequency Adjust -----------------------------------------------------------------------
Power Supply Adjustment ------------------------------------------------------------------------
DC Zero Adjustment and Bias -------------------------------------------------------------------
DC Amplifier Output Adjust ---------------------------------------------------------------------
Ohms Adjust (R3)-----------------------------------------------------------------------------------
AC Zero Adjust -------------------------------------------------------------------------------------
AC Full Scale Adjust (.5 V Range) --------------------------------------------------------------
Troubleshooting Procedure -----------------------------------------------------------------------------
Servicing Etched Circuit Boards -----------------------------------------------------------------
Chopper, Assembly Installation -----------------------------------------------------------------
Page
5-10
5-10
LIST OF TABLES
Number
Specifications ------------------------------------------------------------------------------------------------------------
Possible Eror When Measuring Voltage of Complex Waveforms -------------------------------------------
Recommended Test Equipment -------------------------------------------------------------------------------------
DCV Accuracy Test ----------------------------------------------------------------------------------------------------
DCV Input Resistance Test -------------------------------------------------------------------------------------------
DCA Accuracy Test ----------------------------------------------------------------------------------------------------
Deleted
AC Accuracy Test ------------------------------------------------------------------------------------------------------
Power Supply Test -----------------------------------------------------------------------------------------------------
AC Full Scale Adjust --------------------------------------------------------------------------------------------------
Front Panel Troubleshooting Prmedure --------------------------------------------------------------------------
Troubleshooting Prwedure ------------------------------------------------------------------------------------------
Number
LIST OF ILLUSTRATIONS
The Model 410C Electronic Voltmeter
The Combining Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steps to Place Instrument in Combining Case--------------------------------------------------------------------
Adaptor Frame Instrument Combination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T
WO
Half Modules in Rack Adaptor -------------------------------------------------------------------------------
Front and Rear Panel Controls --------------------------------------------------------------------------------------
DC Voltage Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Current Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AD Voltage Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum AC Voltage Chart for 11036A Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graph Used in Calculation of Pulse Voltage Readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resistance Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Nano-Ampere Current Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram, Model 410C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modulator - Demodulator Mechanical Analogy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Simplified Schematic, DC Current Measurement ---------------------------------------------------------------
Page
Number
Simplified Schematic, DC Voltage Measurements --------------------------------------------------------------
Simplified Schematic, Resistance Measurement -----------------------------------------------------------------
Simplified Schematic, AC Voltage Measurement ---------------------------------------------------------------
Alternate Voltage Source ---------------------------------------------------------------------------------------------
DC Ammeter Operation ----------------------------------------------------------------------------------------------
High Frequency Response Test --------------------------------------------------------------------------------------
Low Frequency Response Test ---------------------------------------------------------------------------------------
Troubleshooting Tree --------------------------------------------------------------------------------------------------
A4 Chopper Assembly Installation ---------------------------------------------------------------------------------
Chopper Frequency Adjust Setup -----------------------------------------------------------------------------------
Power Supply Measurements ----------------------------------------------------------------------------------------
Power Supply Schematic ----------------------------------------------------------------------------------------------
Typical Amplifier Waveforms ---------------------------------------------------------------------------------------
Amplifier Schematic---------------------------------------------------------------------------------------------------
Model 11036A AC Probe Exploded --------------------------------------------------------------------------------
Model l1036A Probe Schematic ------------------------------------------------------------------------------------
RANGE and FUNCTION Switching (Pictorial) -----------------------------------------------------------------
Input RANGE and FUNCTION Switching Schematic ---------------------------------------------------------
TM 11-6625-1614-15
Page
i i i
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. If the first three digits on your instru-
ment are 550, refer to figure 5-10, note 14 for the
change in equipments of this serial prefix.
b. A basic issue iterns list for this equipment is not included as part of this manual.
1-A.2. Index of Publications
Refer to the latest issue of DA Pam 310-4 to determine whether there are new editions, changes, or additional publications pertaining to the equipment.
1-A.3. Maintenance Forms, Records, and Reports
a. Reports of Maintenance and Unsatisfactory
Equipment.
Department of the Army forms and procedures used for equipment maintenance will be those prescribed by TM 38-750, The Army Maintenance Management System.
b. Report of Item and Packaging Discrepancies.
Fill out and forward SF 364 (Report of Discrepancy
(ROD) ) as prescribed in AR 735-1l-2/DLAR 4140.
55/NAVMATINST 4355.73/AFR 400.54/MCO
4430.3E.
c. Discrepancy in Shipment Report (DISREP)
(SF361). Fill out and forward Discrepancy in Shipment Report (DISREP) (SF 361) as prescribed in AR
55-38/NAVSUPINST 4610.33B/AFR 75-18/MCO
P4610.19C and DLAR 4500.15.
1-A.4. Reporting Errors and Recoin.
mending Improvements
You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter, DA
Form 2028 (Recommended Changes to Publications and Blank Forms), direct to Commander, US Army
Communications and Electronics Materiel Readiness Command, ATTN: DRSEL-ME-MQ, Fort
Monmouth, NJ 07703. A reply will be furnished to you.
1-A.5. Reporting Equipment Improve.
ment Recommendations (EIR)
If your Electronic Voltmeter needs improvement, let us know. Send us and EIR. You, the user are the only one who can tell us what you don’t like about your equipment. Let us know why you don’t like the design. Tell us why a procedure is hard to perform. Put it on an SF 368 (Quality Deficiency Report). Mail it to Commander, US Army Communications and Electronics Materiel Readiness Command, ATTN: DRS-
EL-ME-MQ, Fort Monmouth, NJ 07703. We’ll send you a reply.
1-A.6. Administrative Storage
Administrative storage of this equipment consists of covering the equipment with heavy paper taped in a way to prevent entry of dust particles. If environment is humid, use bags of dessicant inside the paper covering.
Change 1 1-1/ (1-2 Blank)
Table 1-1.
TM
11-6625-1614-15
Model 410C
1-3
01556-2
1-4
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
0.2 ohms to 500 megohms can be measured with reduced accuracy.
The Model 410C Electronic Voltmeter is shown in Figure 1-1; the
specifications are given in Table 1-1.
1-3. With the Model 11036A detachable AC Probe, the Voltmeter can be used to measure AC voltage from 20 cps to 700 Mc.
From
20 cps to 100 M C
)
AC voltage from 0.5 to 300 volts can be measured;
from 100 Mc to 700 Mc, refer to Figure 3-5 for maximum AC voltage
that can be applied to the AC Probe. For additional information on the AC Probe, refer to Paragraph 1-8.
Model 410C
TM 11-6625-1614-15
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%. The Model 110364 responds to the positive-peak-above-average value of the signal applied. The
Model 410C is calibrated to read in RMS volts, for sine wave inputs .
1 - 5
TM 11-6625-1614-15
Figure 2-1. The Combining Case
2-0
Figure
2-2. Steps to Place Instrument in Combining Case
01556-1
Model 410C
.
Model 410C
TM 11-6625-1614-15
2-1. INSPECTION.
2-2. ‘This instrument was carefully inspected both 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. Also, check for supplied accessories, and test the electrical performance of the in-
strument using the procedure outlined in Paragraph
5-5 Performance Checks. If there is any
damage or deficiency, refer to paragraph 1-A.3.
2-3. INSTALLATION.
2-4. The Model 410C is transistorized except for one vacuum tube and requires no special cooling.
However, the instrument should not be operated where the ambient temperature exceeds 55° C (140° F).
2-5. RACK MOUNTING.
2-6. The Model 410C is a submodular unit designed for bench use. However, when used in combination with other submodular units, it can be bench and/or rack mounted.
The Combining Cases and Adapter
Frame are designed specifically for this purpose.
2-7. MODELS 1051A AND 1052A COMBINING CASES.
The Combining Cases are full-module unita which accept various combinations of submodular units.
Beinga full width unit, it can either be bench or rack mounted. An illustration of the Combining Case is
shown in Figure 2-1. Instructions for installing the
Model 410C are shown in Figure 2-2.
2-8. RACK ADAPTER FRAME ( Part No. 5060-
0797). The adapter frame is a rack mounting frame that accepts various combinations of submodular units. It can be rack mounted only.
An illustration
of the adapter frame is given in Figure 2-3. Instruc-
tions are given below.
a. Place the adapter frame on edge of bench as
b. Stack the submodular units in the frame as
c. Place spacer clamps on the two end instruments
(see step 4, Figure 2-4) and push the combination into
the frame.
d. Insert screws on either side of frame, and tighten until submodular instruments are tight in the frame.
e.
The compiete assembly is ready for rack mounting.
01556-2
SECTION II
INSTALLATION
2-9. THREE-CONDUCTOR POWER CABLE.
2-10. To protect operating personnel, the National
Electrical Manufacturers’ Association (NEMA) recommends that the instrument panel and cabinet be grounded.
All Hewlett-Packard instruments are equipped with a three-conductor power cable which grounds the instrument when plugged into an appropriate receptacle.
2-11. To preserve the protection feature when operating ihe instrument from a two-contact outlet, use three - prong to two - prong adapter and connect the green pigtail on the adapter to ground.
2-12. PRIMARY POWER REQUIREMENTS.
2-13. The Modei 410C can be operated from either
115 or 230 volts, 50 to 1000 cps. The instrument can be easily converted from i 15- to 230- volt operation.
The LINE VOLTAGE switch, S4 a two-position slide switch located at the rear of the instrument, selects the mode of AC operation. The line voltage from which the instrument is set to operate appears on the siider of the switch. A 0.25-ampere, slo-blo fuse is used for both 115- and 230-volt operation.
Figure 2-3. Adapter Frame Instrument Combination
2-1
TM 11-6625-1614-15
DO NOT CHANGE THE SETTING OF THE
LINE VOLTAGE SWITCH WHEN THE VOLT-
METER 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.
Model 410C
2-16. If the original container is to be used, proceed as follows: a. Place instrument in original container if available.
b. Ensure that container is well sealed with strong tape or metal bands.
2-17. If original container is not to be used, proceed as follows: a. Wrap instrument in heavy paper or before placing in an inner container.
plastic b. Place packing material around all sides of instrument and protect panel face with cardboard strips.
Figure 2-4. Two Half Modules in Rack Adapter c. Place instrument and inner container in a heavy carton or wooden box and seal with strong tape or metal bands.
d . M a r k s h i p p i n g c o n t a i n e r w i t h " D E L I C A T E
INSTRUMENT”, “FRAGILE”, etc.
2-2
01556-1
.
Model 410C
TM 11-6625-1614-15
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. DC voltage, DC current and resistance knobs and indicators are in black; AC voltage controls and indicators are in red.
3-3. ADJUSTMENT OF MECHANICAL ZERO.
3-4. The procedure for adjustment of mechanical
3-5. FRONT AND REAR PANEL DESCRIPTION.
3-6. Figure 3-1 describes the function of all front
and rear panel controls, connectors and indicators .
The description of each control, connector and indicator is keyed to a drawing which accompanies the figure.
3-7. OPERATING PROCEDURES.
3-8. There are five operating procedures: DC Volt-
age Measurements, Figure 3-2; DC Current Measure-
ments, Figure 3-3; AC Voltage Measurements, Fig-
ure 3-4; Resistance Measurements, Figure 3-7; and
Measuring DC Current in Nano-amperes, Figure 3-8.
Note
Ageing of the neon tamps in the chopper assembly can cause a change in chopper frequency which produces a slight oscillatory movement of meter pointer. If this oscillatory movement is observed,
rotate Oac Freq Adj A3R5 (see Paragra-
graph 5-28) in the ccw direction until oscillation of pointer stops.
3-9.
DC VOLTAGE MEASUREMENTS (Figure 3-2).
3-10. The Model 410C is normally floating; however a shorting bar can be connected at the DC AMPLIFIER
OUTPUT connector on the rear panel. When the instrument is floating, the COM Lead should not be connected to voltages greater than 400 volts.
3-11. DC CURRENT MEASUREMENTS (Figure 3-3).
3-12. General instructions for the measurement of
DC current are the same as those given for DC volt-
age measurements, Paragraph 3-9.
01556-2
DISTRIBUTION SYSTEMS IS GROUNDED.
EXTREME CAUTION MUST BE USED IF
DIRECT MEASUREMENT OF POWER
LINE VOLTAGES IS ATTEMPTED. IF
THE GROUND CLIP LEAD IS ACCIDEN-
TALLY CONNECTED TO THE UN-
GROUNDEDSIDE OF THE LINE. SEVERE
DAMAGE TO THE 410C IS POSSIBLE
BECAUSE OF THE SHORT CIRCUIT
CREATED.
POWER LINE’ VOLTAGES
CAN BE SAFELY MEASURED BY USING
THE PROBE TIP ONLY. CONTACTING
THE GROUNDED POWER CONDUCTOR
WILL GIVE A READING OF 0 VOLTS
WHILE CONTACTING THE UN-
GROUNDED LEAD WILL GIVE FULL
VOLTAGE READING.
3-14.
Although the Model 410C indicates a full scale
AC range of 500 volts, the optional Model 11036A AC
Probe should not be connected to AC voltages in excess of 300 volts RMS. AC voltage referenced to a
DC voltage may be measured, but the AC Probe clip
(alligator type) must be connected to the ground of the circuit under test.
WHEN MEASURING AC REFERENCED
TO DC, THE PEAK AC VOLTAGE PLUS
DC VOLTAGE CONNECTED TO TRE
PROBE MUST NOT EXCEED 420 VOLTS.
3-15. PRECAUTION WHEN MEASURING AC VOLT-
A G E .
3-16. Special considerations must be kept in mind when making AC voltage measurements. These con-
siderations are discussed in the following paragraphs.
3-17. GENERAL CONSIDERATION OF COMPLEX
WAVEFORMS.
Waveforms containing appreciable harmonics or spurious voltages will introduce error in the meter indication since the meter has been calibrated to read RMS values of true sine waves while the Model 11036A Probe is a peak-above-average responding device.. The magnitude of error that may be expected when harmonics are present on the mea-
sured waveform is indicated in Table 3-1.
3-18. VOLTAGE MEASUREMENTS AT FREQUEN-
CIES BELOW 50 CYCLES/SECOND. Voltage measurements at frequencies as low as 10 cycles per
3-1
TM 11-6625-1614-15
Model 410C
3-2
1.
2.
3.
4.
5.
6.
7.
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.
AC ZERO: This control provides adjustment for zero-setting the meter before making AC voltage measurements.
8.
9.
DCV: This lead is used in conjunction with the
COM Lead to measure ±DC voltage.
AC PROBE (300V MAX): Receptacle for telephone-type plug of Model 11036A AC Probe.
With probe connected the Voltmeter may be used to make AC voltage measurements.
MECHANICAL ZERO ADJUST: This adjustment mechanically zero-sets the meter prior to turning on Voltmeter.
10.
ADJUST: This control is used to set meter pointer to before resistance measurements are made. Only periodic adjustment o f this screwdriver adjustment is necessary.
RANGE: This control selects the full scale meter range.
AC POWER SWITCH: This push button - lamp combination, when depressed, turns the instrument power on or off. The push button glows when the Voltmeter power is on,
11.
LINE VOLTAGE: This two-position slide switch sets the instrument to accept either 115 or 230 volt AC primary power.
DCA-OHMS: This lead is used in conjunction with the COM Lead to measure DC current or ohms. The FUNCTION SELECTOR determines which measurement is made.
12.
FUSEHOLDER: The fuseholder contains a 0. 25 ampere slow-blow fuse for both 115 vac and
230 vac modes of operation.
COM: This lead is used with the input leads for
DC voltage current, AC voltage, and resistance measurements.
The COM Lead is normally floating; however, a shorting bar can be connected from the floating ground terminal to the chassis ground terminal on the DC AMPLIFIER
OUTPUT connector. If a shorting bar is not used, the COM Lead is floating except when the
FUNCTION SELECTOR is set to ACV.
13.
14.
AC POW ERCONNECTOR: Accepts power cable supplied with the instrument.
DC AMPLIFIER OUTPUT: Provides DC voltage output proportional to meter indication for driving external recorder. 1.5 volts DC output for full scale meter deflection.
Figure 3-1. Front and Rear Panel Controls
01556-2
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 POLY-
STYRENE, A LOW-MELTING POINT
MATERIAL. IT IS NOT POSSIBLE TO
SOLDER TO THE CONTACT WHICH IS
EXPOSED WITH THE PROBE NOSE IS
REMOVED WITHOUT
THE POLYSTYRENE.
DESTROYING
Table 3-1.
Possible Error When Measuring Voltage of Complex Waveforms
,
% Harmonic True RMS Value Voltmeter Indication o
10% 2nd
20% 2nd
50% 2nd l 0 % 3 r d
2 0 % 3 r d
5 0 % 3 r d
100
100.5
102
112
100.5
102
112
100
90 to 110
80 to 120
75 to 150
90 to 110
87 to 120
106 to 150
3-19. VOLTAGE MEASUREMENT AT HIGH FRE-
QUENCIES. At frequencies above 100 megacycles the distance between the point of voltage measurement and anode of the probe diode must be made as short as possible. If feasible, substitute a small disc type capacitor of approximately 50 picofarsds for the removable tip on the probe. Solder one terminal of the button capacitor to the measurement point in the circuit and not to the probe contact. The probe contact ( with tip removed ) can then contact the other terminal of the capacitor for the measurement.
3-20. At frequencies above 100 megacycles considerable voltage may be built up across ground leads and along various part of a grounding piane.
Consequently, to avoid erroneous readings when measuring medium and high frequency circuits, use the ground clip lead on the shell of the probe to connect the circuit ground. In some cases at the higher frequencies it maybe necessary to shorten the grounding lead on the probe.
3-21. For all measurements at higher frequencies, hold the molded nose of the probe as far from the external ground piane or from object at ground potential as can conveniently be done. Under typical conditions, this practice will keep the input capacitance several tenths of a picofarad lower than otherwise.
3-22. For measurements above approximately 250 megacycles it is almost mandatory that measurements be made on voltages which are confined to coaxial transmission iine circuits. For applications of this type, the Model 11036A Probe is particularly suitable because the physical configuration of the diode and probe is that of a concentric line, and with a few precautions it can be connected to typical coaxial transmission line circuits with little difficulty.
01556-2
TM 11-6625-1614-15
Paragraphs 3-19 to 3-27 and Table 3-1
3-23. T
O connect the probe into an existing coaxial transmission line, cut the line away so the center conductor of the line is exposed through a hole large enough to clear the body of the probe. The nose of the probe should be removed for this type of measurement.
Connect one terminal of a button-type capacitor of approximately 50 picofarads to the center conductor of the coaxial line so that the other terminal of the oapacitor will contact the anode connection of the probe.
A close-fitting metal shield or bushing should be arranged to ground the outer cylinder of the probe to the outer conductor of the transmission line.
This type of connection is likely to cause some increase in the standing wave ratio of the line at higher frequencies.
The Model 11042A Probe T Connector is designed to do this job with SWR or less than 1.1 at 500 Mc (see
Paragraph 1-11).
3-24. EFFECT OF PARASITIC ON VOLTAGE
READINGS .
At frequencies above 500 megacycles, leads or portions of circuits often resonate at frequencies two, three, or four times the fundamental
Of the voltage being measured. These harmonics may cause serious errors in the meter reading. Owning to the resonant rise in the probe circuit at frequencies above 1000 megacycles, the meter may be more sensitive to the harmonics than to the fundamental. To make dependable measurements at these frequencies, the circuits being measured must be free of ail parasitics.
3-25. EFFECT OF DC PRESENT WITH AC SIGNAL.
When measuring an AC signal at a point where there is a high DC potential, such as at the plate of a vacuum tube, the high DC potential may cause small leakage current through the blocking capacitor in the tip of the
Model 11036A AC Probe. When the AC signal under measurement is small, the error introduced into the reading can bes significant. To avoid leakage, an additional capacitor with a dielectric such as mylar or polystyrene which has high resistance to leakage is required. (Use 5 picofarads or higher, and insert the capacitor between the point of measurement and the probe tip.)
3-26. PULSE MEASUREMENTS
3-27. POSITIVE PULSES. The Model 11036A AC Probe is peak-above-average responding and clamps the positive peak value of the applied voltage. This permits the probe to be used to measure the positivevoltage amplitude of a pulse, provided the reading obtained is multiplied by a factor determined from the following expression: t
1 t
2
K is the duration of the positive portion of the voltage in microseconds.
is the duration of the negative portion of the voltage in microseconds.
is a factor determined from the expression
R o
/ t 1 and the graph shown as
where R o is the source impedance of the pulse generator in kilohms, and t l is the duration of the positive portion of the pulse in microseconds.
3-3
TM 11-6625-1614-15
PRF is the pulse repetition frequency in pulses per second (pps).
Suppose, for example: t
1 =
10 microseconds t
2 =
K =
990 microseconds
0.55
PRF = 1000 pps
To find K, assuming t s e c o n d s : R o
/ l
= 2 kilohms and t l=10micro-
= 2 10° = 0.2. Location 0.2 on the
X axis of the graph shown as Figure 3-6, and reading
K where X and Y axes intersect the unmarked curve. If t the ratio of R o
/ l were greater than 1, multiply the t
X and Y axes by 10, and use the curve marked ”R o
/
1 and K each X10”.
Solving the expression for the multiplying factor,
Model 410C
3-28. NEGATIVE PULSES.
t
3-29. In the case of a 10 microsecond negative pulse
( t l
2) and a pulse repetition frequency (PRF) of 1000 pps, would be 990 microseconds. Thus T o
/ t 1 would be approximately 0, and from the graph it is seen that
K is approximately 0. The expression would then reduce to
3-30. It can be seen that in the case of negative pulses of short duration much smaller readings will be obtained for an equivalent positive pulse. As a result, large multiplying factors must be used and unless the pulse voltage is large, these measurements may be impractical.
3-31. MEASURING RESISTANCE (Figure 3-7).
3-32. Before making resistance measurements, power must be removed f rom the circuit to be tested. Also, make sure capacitors are discharged to eliminate any residual voltage.
3-33. MEASURING DC NANO-AMPERE CURRENT
3-34. The Model 410C can be used to measure nanoampere leakage current in transistors and diodes. The three most sensitive DC voltage measurement ranges are used to measure DC nano-ampere currents.
.
.
3-4
Model 410C
TM 11-6625-1614-15
01556-2
Figure 3-2. DC Voltage Measurements
3-5
TM 11-6625-1614-15
Model 410C
3-6
Figure 3-3. DC Current Measurements
01556-3
Model 410C
TM 11-6625-1614-15
Model 410C
01556-3
Figure 3-4. AC Voltage Measurements
3-7
Model 410C
TM 11-6625-1614-15
01556-2
Figure 3-6. Graph Used in Calculation of Pulse Voltage Readings
3-9
TM 11-6625-1614-15
Model 410C
3-10
Figure 3-7.
Resistance Measurements
01556-2
Model 410C
TM 11-6625-1614-15
01556-3
Figure 3-8.
DC Nano-Amoere Current Measurements
3-11
TM 11-6625-1614-15
Model 410C
Figure 4-1. Block Diagram, Model 410C
4-0
F i g u r e 4 - 2 . M o d u l a t o r - D e m o d u l a t o r M e c h a n i c a l A n a l o g y
01556-2
Model 410C
TM 11-6625-1614-15
SECTION IV
THEORY OF OPERATION
4-1.
OVERALL DESCRIPTION.
4-2.
The Model 410C includes an input network, a modulator - amplifier- demodulator, and a meter circuit. A block diagram of the Model 410C is shown
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. The input network attenuates the DC signal to a level determined by RANGE and FUNCTION SELECTOR settings. The attenuated DC voltage is applied to the modulator which converts the DC to AC for amplification. The amplified AC signal is converted back to DC voltage inthe demodulator and coupled to cathode follower VIB. The cathode follower output to the DC AMPLIFIER OUT-
PUT connector and meter circuit is a DC voltage proportional to the amplitude of the signal applied to the input. A portion of the voltage to the meter circuit is returned to the modulator as feedback. When the feedback voltage and attenuated DC voltage are nearly equal, the meter stabilizes.
4-4. CIRCUIT DESCRIPTION.
4-5. INPUT NETWORK.
4-6. The input network includes a precision voltage divider, which by means of the FUNCTION SELECTOR and RANGE switches, providesa maximum of 15 millivolts at the modulator input regardless of the range set and signal applied. The ± DCA, ±DCV, OHMS, and
ACV modes of operation are discussed below.
4-7. DC CURRENT MEASUREMENTS: Refer to Figure 4-3, throughout this explanation. The purpose of
the input network is to provide proper attenuation of currents applied.
Currents from 1.5 µa to 150 ma full scale are applied with input impedance decreasing from 9K ohms on the 1.5 µa range to approximately
0.3 ohms on the 150 ma range.
4-6. Tbe change in input impedance is varied by using
DC current shunts in conjunction with RANGE switch
A2S2. The DC voltage developed across these shunt resistors, when applied through the modulator-amplifier-demodulator network to the meter, provide a deflection on the meter proportional to the DC current being measured.
4-9. DC VOLTAGE MEASUREMENTS.
R e f e r t o
Figure 4-4 throughout this explanation. The purpose
of the input network is to accurately attenuate the input signal to a maximum of 15 millivolts at the modu-
01556-2 later input. The network presents an input impedance of 10 megohms on the three most sensitive ranges and
100 megohms on all other ranges.
4-10. The resistor R1 (located in the DCV probe) in conjunction with resistors A2R10 through A2R26, provides the 10 megohm input impedance required for the three most sensitive DCV ranges. Resistors A2R4 and A3R30 are shunted out of the circuit by the RANGE switch on the three most sensitive DCV ranges.
4-11. When using the eight less sensitive ranges,
A2R4 and A3R30 are placed in series with Rl and
A2R10 through A2R26 to present more than 100 megohm impedance to the input.
4-12. A3R30 is used to calibrate full scale on the
1500 volt range. (See Paragraph 5-35. )
4-13. RESISTANCE MEASUREMENTS. The purpose
of the input network shown in Figure 4-5 is to place
approximately 0. 6 volt DC source in series with a known (reference) resistance. The resistance to be measured is ptaced in parallel with the known resistance, which changes the voltage proportionally. The maximum changes in voltage applied to the modulator is 15 mv because of attenuation provided by A2R4,
A3R30, and A1R2.
4-14.
A DC current of approximately 60 ma is supplied at the junction of A2R22 and A2R23 through
A7R10, R2, A2R2 and A2R1 to the input network. The
OHMS ADJ., R3, sets the meter for full scale
Resistor A2R1 is shorted out in the XIM position of the RANGE switch; resistors A2R1 and A2R2 are shorted out in the X10M range. The resistors A2R2 and/or A2R1 are electrically removed from the circuit to increase the voltage at the junction of A2R22 and A2R23. This is done to compensate for tbe loading of the attenuator (A2R4, A3R30, and A1R2) on these ranges.
4-15.
AC VOLTAGE MEASUREMENTS. Refer to
Figure 4-6 throughout this explanation. Voltage at
the AC probe is converted to DC and applied to the input network. The input signal is attenuated to produce a maximum of about 15 millivolts at the modulator input .
AC zero adjustment of meter pointer is made with the AC ‘ZERO control.
4-16. MODULATOR-DEMODULATOR.
4-17. Refer to the Amplifier Schematic, Figure 5-10 ,
and to the Mechanical Analogy Schematic,
4-2 throughout this explanation.
4-18. The input network applies approximately 15 millivolts DC, for full scale meter deflection (positive or negative, depending on the polarity of the
4-1
TM 11-6625-1614-15
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. The neon lamps are part of a relaxation oscillator, whose frequency is controlled by A3R5. The oscillator frequency is nominally set to 100 cps for operation from
60 cps power line, or to 85 cps for 50 cps line. This frequency is selected so that it is not harmonically related to the power line frequency, precluding possible beat indications on the meter.
4-19. As the photoconductors are alternately illuminated by the neona, their respective resistances are low (conductive ) when illuminated and high (non-conductive) when darkened. Therefore the input voltage and feedback voltage are alternately applied to the input amplifier. The amplitude of the resultant signal to the amplifier is the voltage difference between the input and feedback voltages.
4-20. The chopped DC signal is amplified by a three stage RC amplifier, consisting of A3V1A, A3Q1 and
A3Q2. The amplified signal to the input of the demodulator-chopper is 180° out of phase with the output of the modulator-chopper.
4-21.
The demodulator - chopper consists of two photoconductors, A4V3 and A4V4, which are alternately illuminated by neon tamps A4DS1 and A4DS2, respectively. Approximately 150 millivolts square-wave is applied to the demodulator from the amplifier. Since the same neon lamps illuminate both the modulator and demodulator photoconductors, operation of the two chopper is synchronous. Therefore, when A4V1 is sampling the input voltage, A4V3 is clamping the amplified and inverted difference voltage to ground.
Alternately, when A4V2 is sampling the feedback voltage, A4V4 is charging capacitors A3C13 and A3C14 to the peak value of the square-wave. These capacitors maintain this charge so long as the input voltage remains constant by virtue of having no discharge path and because they are being repetitively recharged by the demodulator.
4-22. Therefore, a DC potential, proportional to the difference between the input and feedback voltages, is applied to the grid of the cathode follower and subsequently to meter circuit and DC AMPLIFIER OUTPUT connector. A portion of the meter circuit voltage is fed back to the modulator. The meter stabilizes when the feedback voltage and input voltages are nearly equal.
4-23. THE FEEDBACK NETWORK.
4-24. The feedback network drives the meter and determines the DC gain of the amplifier. The feedback is varied depending on the position of the FUNC-
TION and RANGE selectors. The different feedback configurations are discussed below.
4-2
Model 410C
4-25.
FEEDBACK NETWORK FOR ±DCA. OHMS,
AND ±DCV. Figures 4-3, 4-4 and 4-5 show the feed-
back configuration for ail positions of the FUNCTION
SELECTOR except ACV. The meter is electrically inverted for ±DCV and ±DCA modes of operation. The
DC OUTPUT ADJ., A6R20 sets the output voltage. The
DC pot, A6R18 determines the amount of feedback to the modulator. The resistor A2R30 is in the circuit in the ± .015 DCV and ±1.5 µa modes of operation, to decrease feedback and thus increase amplifier gain to compensate for the decrease in input signal to the modulator on these ranges.
4-26. FEEDBACK CIRCUIT FORAC VOLTAGE MEA-
SUREMENTS: Figure 4-6 shows the feedback confi-
guration for the ACV position of the FUNCTION SEL-
ECTOR switch, A2S2. The resistors that are placed in the circuit by the RANGE switch program the amplifier gain to compensate for the non-linear response of the AC probe. A6R16 and A6CR1 compensate the non-linear response of the AC probe to the linear calibration of the upper meter scale on the 5 volt range.
4-27. POWER SUPPLY.
4-28. PRIMARY POWER. Either 115 or 230 volt ac power is connected through fuse R1 (0.25 amp slo-blo) and switch S3 to the primary of power transformer
T1. Switch S4 connects T1 primaries in parallel for l15 volt operation of in series for 230 voit operation.
4-29.
UNREGULATED AND ZENER REGULATED
POWER SUPPLY. Full wave rectifier CR1 and CR2 produces unregulated +270 volts, which is used to drive the photochopper neons. Unregulated +175 volts and +140 volts are tapped off and are used to provide
B+ to the plates of A4V1B and A4V1A, respectively.
Zener regulators A7CR6 and CR7 provide regulated
+38 volts and -9 volts to bias A3Ql and A3Q2. Filtering of the outputs is provided by the RC network consisting of A7R1 through A7R3 and C5A through C5D.
4-30. SERIES REGULATED POWER SUPPLY. The output of the full wave rectifier CR3 and CR4 is regulatedbytransistor Ql, which is connected in series with the output. Zener diode A7CR8 provides reference voltage to the base of Q1. Regulated +6 volts is supplied to the filaments of A3VlA/B and the AC Probe diode
A6V1.
+0.6 volts is provided through A7R10 to R3, the OHMS ADJ, control. Filtering of the outputs is provided by C6A and C6B.
4-31. STANDBY FILAMENT SUPPLY. The filament tap (Tl, Pins 1 and 2) provides 6.0 volts actothe filament of the AC probe diode, A8V1, so that the filament remains warm when the Modei 410C is being used in modes of operation other than ACV. W h e n
FUNCTION selector A1S1 is switched to ACV, 6.0
volts AC is removed from the filament and 6 volts DC is applied. Therefore, the ACV mode is ready for imrnediate use, without waiting for the filament to warm up.
01556-2
TM 11-6625-1614-15
Model 410C
Instrument Type
Voltmeter Calibrator
DC Power Supp Iy
DC Voltmeter
Frequency Response
Test Set
Oscillator
RF Signal Generator
Power Meter
VHF Signal Generator
AC Voltmeter
Electronic Counter
DC Standard
Ohmmeter
Thermistor Mount
Pr~be-T-Connector
10 KC Filter
Table 5-1.
Recommended Test Equipment
Required Characteristics Use
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
Range: O to 10 v continuous
Range: 10 v
Accuracy: +0. 2%
DC Ammeter Accuracy
Checks
Accumcy Checks; Power
Supply Measurements;
Troubleshooting
Recommended Model
@ Model 738BR Voltmeter Calibrator
@Model 723A DC Power supply
@ Model 3440A/3442A
Digital Voltmeter
Frequency: 20 cps to 10 Mc with external oscillator
Output: 2 v into 50 ohms
Frequency: 20 cps to 10 Mc output : 2.0 v
Frequency Response Test @ Model
Oscillator
651A Test
Frequency: 10 Mc to 480 Mc Frequency Response Test @ Model 608C RFSigmal output: 1.0 v Generator
Frequency: 10Mc to700 Mc
Range: 1.0 v
Frequency Response Test @ Model 431B Power
Meter
Frequency: 480 Mc to 700Mc Frequency Response Test @ Model 612A VHF
Signal Generator
Range: 115 V
Frequency Range: to at least 102 cps output: 1000 v
Accuracy: +0. 2%
Range: 100 Mf2
Accuracy: +5%
Frequency: 10 Mc to 700Mc
Impedance: 50 ohm match
For use with 50 ohm transmission line
High pass fi 1 ter capable of
10 kc re]ection
Male BNC to male BNC
Type N male to BNC female
Frequency Response Test
Power Supply
Measurements (ripple)
@
Model 3400A RMS
Voltmeter
Chopper Frequency Adjust @ Model 521C Electronic
Counter
DC Adjust
Troubleshooting
@ Model 740A DC
Standard
@
Model 412A
DC VTVM
Frequency Response Test
Frequency Response Test
Frequency Response Test
Frequency Response Test
Frequency Response Test
@ Model 739AR Frequency Response Test
Set
@? Model 478A Coaxial
Thermistor Mount
@ Model 11042A Probe-
T-Connector
@ Model K02-411A
10 KC Filter
@ Part No.
1250-0216
@ Part No. 1250-0067 i
Connector Adapter
Connector Adapter
Resistors:
10 M!l
5 MQ
4,5Mfl
500 K
56 K
10 K
9K
1.5K
56 ohms
10 ohms
Accuracy: *1%
Accuracy: +1%
Accuracy: +1%
Accuracy: +1%
Accuracy: *1%
Accuracy: +1%
Accuracy:
*I?o
Accuracy: *1%
Accuracy: +1%
Accuracy: *170
Performance Checks
Performance Checks
Performance Checks
Performance Checks
Performance Checks
Performance Checks
Performance Checks
Performance Checks
Performance Checks
Performance Checks
& Part No. 0730-0168
@ Part No. 0730-0125
@ Part No. 0730 -015’7
@ Part No. 0721-0011
@ Part No. 0730-0053
@ Part No. 0727-0157
@ Part No. 0730-0026
@ Part No. 0730 -001’7
@ Part No. 0811-0341
@ Part No. 0727-0335
5-0 01556-2
.
Model 410C
TM 11-6625-1614-15
SECTION V
MAINTENANCE
5 - 1 . I N T R O D U C T I O N .
5-2. This section contains maintenance procedures for the Model 410C Electronic Voltmeter.
5-3. TEST EQUIPMENT REQUIRED.
5-4. The test equipment required to maintain and
adjust the Model 410C is listed in Table 5-1. Equi-
pment having similar characteristics may be substituted for items listed.
5-5. PERFORMANCE CHECKS.
5 - 6 . T h e p e r f o r m a n c e c h e c k s p r e s e n t e d i n t h i s section are front panel operations designed to compare the Model 410C with it’s published specifications.
These operations may be incorporated in periodic maintenance, post repair and incoming quality control checks. These operations should be conducted before any attempt is made at instrument calibration or adjustment. During performance checks, periodically vary the line voltage to the Model 410C, ± 10% on either
115v or 230 v operation. A 1/2 hour warm-up period should be allowed before these tests are conducted.
5-7. ALTERNATE VOLTAGE SOURCE.
5-6. Should it be necessary to use the Model 738AR
Voltmeter Calibrator to conduct these Performance
Checks, the arrangement described in Figure 5-1 will
provide the necessary voltage values required. However; the Model 738BR Voltmeter Calibrator is the preferred instrument for these operations.
5 - 9 . M e c h a n i c a l M E T E R Z E R O .
a.
Turn instrument on.
minute warm-up period.
Allow at least a 20 b. Turn voltmeter off, and allow 30 seconds for all capacitors to discharge.
c.
Rotate mechanical zero-adjustment screw on front panel clockwise until pointer reaches zero, moving up scale.
d. If for some reason the pointer should overshoot zero, repeat step c until desired results are obtained.
e. When pointer has been positioned at zero, rotate zero-adjust screw slightly counterclockwise to free it. If meter pointer moves to the left during this action, repeat steps c and e.
5-10. DC VOLTMETER OPERATION.
5-11. ACCURACY CHECK (DCV).
a. Set the Model 410C FUNCTION SELECTOR to the +DCV position; RANGE switch to. 015 V .
Connect Model 410C DCV and COM cables to the
Voltmeter Calibrator Model 738BR) output terminals.
01556-2
Figure 5-1. Alternate Voltage Source
5-1
TM 11-6625-1614-15
Model 410C
Model 410C
Range Settings
.015V
. 0 5 V
. 1 5 V
. 5 V
1 . 5 V
5 V
15 V
50 V
150V
500 V
1500
5-12 b. Adjust Voltmeter Calibrator to provide a
+.015 v dc voltage.
c. Model 410C should read between 0. 0147 and
0.0153 v.
d. Readjust Model 410C and Voltmeter Cali-
brator (,) settings listed in Table 5-2. Note
Model 410C meter readings. If Model 410C fails to meet pecifications, refer to Paragraph, 5-30 and
5−32 for proper a d j u s t m e n t p r o c e d u r e .
INPUT RESISTANCE CHECK (DCV).
a. Connect an external resistor, Rx, of lO M ohms ±1% ( Part No. 0370-0168) in series between the voltmeter calibrator and the DCV cable of the Model 410C.
b. Set Model 410C FUNCTION selector to +DCV;
RANGE to .015 V.
c. Adjust voltmeter calibrator for +.015v DC output.
d. Model 410C should read .0075 v, verifying
R in of 10 M ohms.
e. Table 5-3 provides settings required to
verify Model 410C R in on RANGES specified.
5-13.
5-2 C h a n g e 1
Table 5-2. DCV Accuracy Test
Voltmeter Calibrator
Model 738B
Settings
Range
1. 5-5
Voltage
.015
1. 5-5
1. 5-5
1. 5-5
1. 5-5
1. 5-5
1. 5-5
1. 5-5
1.5-5
1-3
1-3
.05
.15
. 5
1.5
5
15
50
150
300
300
Model 410C
Meter Readings
.01.47 to .0153 V
.049 to .051 V
.147 to .153 V
.49 to .51 V
1.47 to l.53 V
4.9 to 5.l V
14.7 to 15.3 V
49 to 51 V
147 to 153 V
290 to 310 V
270 to 330 V
5-14. ACCURACY CHECK (DCA).
a. Figure 5-2 describes the test arrangement
required for this operation.
The following additional equipment will also be required:
DC Power Supply Model 723A)
DC Voltmeter Model 3440A/3442A)
10 K, 1%, 1 w resistor Part No. 0727-0157)
56 K, 1%, 1 w resistor Part No. 0730-0053)
10 , 1%, 1 w resistor Part No. 0727-0335)
56 , 1%, 1/2 w resistor Part No. 0811-0341)
b. Connect the Model 410C as shown in Figure
5-2; FUNCTION SELECTOR to +DCA; RANGE
to 150 MA.
c. Use 56 ohm resistor for R1 and 10 ohm resistor for R2.
d. Adjust dc power supply to obtain 1.4v reading on system voltmeter.
e. Model 410C should read between 135.5 and
144.5 ma.
f. Adjust dc power supply for System voltmeter
readings listed in Table 5-4. Note Model 410C
meter readings.
5-15. INPUT RESISTANCE CHECK (DCA).
a.
Figure 5-2 describes the test arrangement
required for this operation.
R e p l a c e R 1 a n d
R2 with a 10 ohm ±1% resistor Part No.
0727-0335).
b. Set Model 410C FUNCTION SELECTOR to
+DCA: RANGE to 150 MA.
01556-2
Model 410C
Figure 5-2.
DC Ammeter Operation
Table 5-3. DCV Input Resistance Test
Table 5-4. DCA Accuracy Test
TM 11-6625-1614-15
01556-2 5-3
TM 11-6625-1614-15
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
- R
X
I
410C
I 4 1 0 C f. Set Model 410C RANGE to 1.5 µa.
g .
Replace Rx with a 9 K ohm ±1% resistor
Part No. 0730-0026).
h. Adjust dc power supply to provide system voltmeter reading of 13.5 mv.
j.
Model 410C should read approximately 1.5
µa.
This will verify R in of 9 K on 1.5 µa range.
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.
D e l e t e d
Model 410C
5-16.
OHMMETER OPERATION.
a. A 10 ohm ±l% resistor Part No. 0727-
0335) and a 10M resistor Part No. 0730-
0168) will be required for this test.
b. Set Model 410C FUNCTION SELECTOR to
OHMS; RANGE to RX10.
c. Set pointer to using rear panel adjustment (OHMS ADJ) if required.
d. Connect COM and DCA OHMS cables across
10 ohm resistor.
5-19. AMPLIFIER GAIN CHECK.
e. Meter should read 1 (±5%), indicating 10 ohms.
f. Reset Model 410C RANGE to RX10M. Replace 10 ohm resistor with 10 M ohm resistor.
g. Meter should read 1 (+5%), indicating 10 M ohms.
a . C o n n e c t V o l t m e t e r C a l i b r a t o r M o d e l
738BR) output to Model 410C DCV and COM cables.
b. Connect DC Voltmeter Model 3440A/
3442A) to DC AMPLIFIER OUTPUT on rear panel of Model 410C. Set DC Voltmeter RANGE to 10 v.
Table 5-5. DC Voltage Output Test
D e l e t e d
5-4 C h a n g e 1 01556-2
Model 410C
TM 11-6625-1614-15
Parsgraphs 5-20 to 5-23
.
Figure 5-3.
High Frequency Response Test c. Set Model 410C FUNCTION SELECTOR to
+DCV ; RANGE to .015 V.
d. Adjust voltmeter calibrator for +. 015 VDC output.
e. The dc voltmeter should read +1.5 v. This will vertfy a gain of 100, when the gain /A/ equals E DC out/ E 410C.
5-20. AMPLIFTER NOfSE CHECK.
a. Leave the dc voltmeter connected to the DC
AMPLIFIER OUTPUT as in Paragraph 5-19.
b. Set the Model 410C RANGE to 1500 V;
FUNCTION SELECTOR to +DCV.
c. Short the Model 410C DCV and COM cables.
Note dc voltmeter readings.
This reading s h o u l d b e l e s s t h a n 7 . 5 m i l l i v o l t s .
5-21.
d. Reset Model 410C RANGE to 1.5 V. DC
Voltmeter should read less than 7.5 mv.
DC AMPLIFTER OUTPUT
CHECK.
IMPEDANCE a. Connect an external DC Voltmeter Model
3440A/3442A) to Model 410C DC AMPLIFIER
OUTPUT terminals on rear panel.
b. Set Model 410C FUNCTION SELECTOR to
OHMS position.
c . R e c o r d v o l t a g e i n d i c a t e d o n e x t e r n a l d c voltmeter for use as a reference.
d. Connect a 1.5 k ohm ±1% resistor Part
No. 0730-0017) across Model 410C DC AMPLI -
FIER OUTPUT terminals. DC voltage recorded in step c above should not change more than
3 mv, indicating that dc amplifier output impedance is within the 3 ohm specification at dc.
5-22. AC VOLTMETER OPERATION.
5-23. 11036A AC PROBE ACCURACY CHECK.
a. Figure 5-3 describes the test arrangement
required for this operation. Do not place
Model 410C AC Probe in T-Connector at this point.
b. Adjust signal generator for a 0.7 volt (rms) output at 1000 cps.
c. Connect Model 11036A AC Probe to signal generator and read output on Model 410C Voltmeter (meter should read 0.7 volts).
d. Remove probe tip from Model 11036A and
connect the ac probe as shown in Figure 5-4.
e. Turn signal generator to 50 Mc and adjust signal generator for a power reading of 9.8
dbm (0.7 volts) on the power meter.
f. The difference between reading on Model
410C meter and 0.7 volt reference is the ac probe error at that frequency.
g. Repeat steps f and g every 100 Mc from 50 to 700 Mc.
01556-2 5-5
TM 11-6625-1614-15
Parsgraphs 5-24 to 5-25
Model 410C
Figure 5-4.
Low Frequency Response Test
AC VOLTMETER ACCURACY CHECK.
5-25.
AC VOLTMETER FREQUENCY RESPONSE
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 a. A Frequency Response Test Set Model
739AR), a Test Oscillator Model 651A), an
RF Signal Generator Model 608 C), a Power
Meter Model 431 B), a Thermistor Mount
Model 478A), a Probe - T - Connector
Model 11042A), a VHF Signal Generator
Model 612A) and a 10 KC Filter Model K02-
411A) will be required for this operation. Figure 5-3 and 5-4 describe the arrangement to be
Table 5-6. AC Accuracy Test
5-6 C h a n g e 1
01556-2
Model 410C
TM 11-6625-1614-15
b . C o n n e c t t h e M o d e l 4 1 0 C a s s h o w n i n F i g u r e 5 - 4 . S e t M o d e l
410C FUNCTION SELECTOR toACV; RANGE to 1.5 V.
c . S e t f r e q u e n c y r e s p o n s e t e s t s e t t o E X T E R N A L .
d . A d j u s t t e s t o s c i l l a t o r o u t p u t A M P L I T U D E t o p r o v i d e M o d e l
4 1 0 C r e a d i n g o f 1 . 4 V ; F R E Q U E N C Y t o 4 0 0 c p s .
e . S e t f r e q u e n c y r e s p o n s e t e s t s e t M E T E R S E T t o c o n v e n i e n t
SET LEVEL.
f . V a r y t e s t o s c i l l a t o r f r e q u e n c y f r o m 2 0 c p s t o 1 0 M c . M o d e l
4 1 0 C s h o u l d r e a d b e t w e e n 1 . 2 5 a n d 1 . 5 5 v a t a l l f r e q u e n c i e s .
W h e n c h e c k i n g t h e f r e q u e n c y r e s p o n s e f r o m 2 0 c p s t o 5 0 c p s ,
t h e p r o b e t i p o n t h e M o d e l 1 1 0 3 6 A a n d c o n n e c t d i r e c t l y t h r o u g h a
5 0 - o h m l o a d t o t h e o u t p u t o f t h e F r e q u e n c y R e s p o n s e T e s t S e t .
C o n n e c t t h e o u t p u t o f t h e T e s t O s c i l l a t o r d i r e c t l y t o t h e i n p u t o f t h e F r e q u e n c y R e s p o n s e T e s t S e t .
O b s e r v e s t e p g t h r o u g h o u t t h e e n t i r e o p e r a t i o n .
g . I f f r e q u e n c y r e s p o n s e t e s t s e t d e f l e c t i o n v a r i e s f r o m p r e s e t
S E T L E V E L , a d j u s t t e s t o s c i l l a t o r o u t p u t a m p l i t u d e t o r e t u r n p o i n t e r t o o r i g i n a l p o s i t i o n .
h . T o c h e c k M o d e l 4 1 0 C f r e q u e n c y r e s p o n s e f r o m 1 0 M c t o 4 8 0 M c ,
u s e a r r a n g e m e n t d e s c r i b e d i n F i g u r e 5 - 3 .
i . Set Model 410C FUNCTION SELECTOR to ACV; RANGE to .5 V.
j . A d j u s t R F s i g n a l g e n e r a t o r t o p r o v i d e M o d e l 4 1 0 C r e a d i n g o f 0 . 4 5 V a t 1 0 M c .
N o t e p o w e r m e t e r r e a d i n g ; m a r k f o r f u t u r e r e f e r e n c e .
5 - 7
TM 11-6625-1614-15
Model 410C k . V a r y R F s i g n a l g e n e r a t o r f r e q u e n c y f r o m 1 0 M c t o 4 8 0 M c .
M o d e l 4 1 0 C s h o u l d r e a d b e t w e e n 0 . 4 0 t o 0 . 5 0 v a t a l l f r e q u e n c i e s .
l . I f p o w e r m e t e r p o i n t e r v a r i e s f r o m r e f e r e n c e d e t e r m i n e d i n s t e p j a b o v e , r e a d j u s t R F s i g n a l g e n e r a t o r O U T P U T L E V E L t o r e t u r n p o i n t e r t o r e f e r e n c e d e f l e c t i o n .
m . T o c h e c k M o d e l 4 1 0 C f r e q u e n c y r e s p o n s e f r o m 4 8 0 M c t o 7 0 0
M c , r e p l a c e R F s i g n a l g e n e r a t o r w i t h V H F S i g n a l G e n e r a t o r ( H - P
M o d e l 6 1 2 A ) a n d r e p e a t s t e p s i t h r o u g h m a b o v e . M o d e l 4 1 0 C s h o u l d n o t v a r y m o r e t h a n ± 1 0 % f r o m r e f e r e n c e .
5-26. ADJUSTMENT AND CALIBRATION PROCEDURE.
5 - 2 7 . T h e f o l l o w i n g i s a c o m p l e t e a d j u s t m e n t a n d c a l i b r a t i o n p r o c e d u r E f o r t h e M o d e l 4 1 0 C .
T h e s e o p e r a t i o n s s h o u l d b e c o n d u c t e d o n l y i f i t h a s p r e v i o u s l y b e e n e s t a b l i s h e d b y P e r f o r m a n c e C h e c k s ,
P a r a g r a p h 5 - 5 , t h a t t h e M o d e l 4 1 0 C i s o u t o f a d j u s t m e n t .
I n d i s c r i m i n a t e a d j u s t m e n t o f t h e i n t e r n a l c o n t r o l s t o “ r e f i n e ” s e t t i n g s m a y a c t u a l l y c a u s e m o r e d i f f i c u l t y .
I f t h e p r o c e d u r e s o u t l i n e d d o n o t r e c t i f y a n y d i s c r e p a n c y t h a t m a y e x i s t , a n d a l l
a c t i o n .
5-28. CHOPPER FREQUENCY ADJUST.
a . A V o l t m e t e r C a l i b r a t o r ( H - P M o d e l 7 3 8 B R ) a n d a n E l e c t r o n i c
C o u n t e r ( H - P M o d e l 5 2 l C ) a n d a n A C V o l t m e t e r ( H - P M o d e l 3 4 0 0 A ) w i l l b e r e q u i r e d .
5 - 8
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 v o l t a g e o f 1 1 5 v . C h o p p e r f r e q u e n c y w i l l v a r y w i t h l i n e v o l t a g e v a r i a t i o n s .
c . C o n n e c t 4 1 0 C , e l e c t r o n i c c o u n t e r , a n d
v o l t m e t e r a s a h o w n i n F i g u r e 5 - 6 . 1 .
d . S e t M o d e l 4 1 0 C F U N C T I O N S E L E C T O R t o
+ D C V ; R A N G E t o 1 . 5 V .
e . A d j u s t v o l t m e t e r c a l i b r a t o r t o s u p p l y + 5 V d c t o t h e M o d e l 4 1 0 C ( D C V a n d C O M c a b l e s ) .
TM 11-6625-1614-15 f.
Observe counter, and adjust A3R5 for a chopp e r f r e q u e n c y o f 1 0 0 c p s ( ± 2 c p s ) .
5 - 2 9 . P o w e r S u p p l y A d j u s t m e n t
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
p o i n t s a n d t y p i c a l v o l t a g e v a l u e s . M e a s u r e d c v o l t a g e s b e t w e e n c o m m o n a n d d e s i g n a t e d l o c a t i o n o n A l .
b . S e t M o d e l 4 1 0 C F U N C T I O N t o A C V . S h o r t
A C V a n d C O M c a b l e .
voltage
+ 175 v
+ 3 8 V
+ 6 V
–9.1 V
Table 5-7, Power Supply Test
Location on A7
Wht/blk and Orange
Junction of CR6 and R4
Cathode of CR8
Anode of CR7
Tolerance
± 3 0 V
±8.0 V
±0.6 V
+ 1 . 8 V c . M e a s u r e + 1 7 5 v o l t a c r i p p l e w i t h a c v o l t m e t e r
( H - P M o d e l 3 4 0 0 A ) . R M S v a l u e o f r i p p l e s h o u l d n o t e x c e e d 2 . 5 m v .
5 - 3 0 . D C Z e r o A d j u s t m e n t a n d B i a s
a . S e t M o d e l 4 1 0 C F u n c t i o n S e l e c t o r t o + D C V a n d R a n g e S w i t c h t o . 5 V .
b . S h o r t D C V C a b l e t o C O M C a b l e .
c . A d j u s t A 3 R 2 1 f u l l y c o u n t e r c l o c k w i s e , a n d t h e n r o t a t e a b o u t 2 0 ° c l o c k w i s e .
d . A d j u s t Z E R O A D J p o t o n r e a r p a n e l f o r z e r o m e t e r d e f l e c t i o n . S w i t c h t o – D C V . I f a n y d e f l e c t i o n i s o b s e r v e d , a d j u s t Z E R O A D J p o t t o r e t u r n m e t e r p o i n t e r h a l f w a y b a c k t o z e r o . C h e c k z e r o s e t t i n g o n a l l r a n g e s f o r b o t h + D C V a n d – D C V . Z e r o o f f s e t should not exceed 1070 in any case.
5 - 3 1 . D C A m p l i f i e r O u t p u t A d j u s t
a. S e t t h e M o d e l 4 1 0 C F U N C T I O N S E L E C T O R t o A C V ; R A N G E t o 5 V .
b. C o n n e c t a D C V o l t m e t e r ( H - P M o d e l 3 4 4 0 A /
3 4 4 2 A ) t o t h e d c a m p l i f i e r O U T P U T o n t h e M o d e l
4 1 0 C r e a r p a n e l . S e t d c v o l t m e t e r R A N G E t o 1 0 v .
c. C o n n e c t M o d e l 4 1 0 C A C P r o b e t o v o l t m e t e r c a l i b r a t o r o u t p u t . A d j u s t v o l t m e t e r c a l i b r a t o r t o p r o vide a 5 v, 400 cps signal.
d . M o d e l 4 1 0 C s h o u l d r e a d f u l l s c a l e ( 5 v ) . T h e dc voltmeter should indicate 1.5 V. If it does not, adj u s t A 6 R 2 0 f o r 1 . 5 v r e a d i n g .
5 - 3 2 . F u l l S c a l e D C A d j u s t m e n t
a. S e t M o d e l 4 1 0 C . F U N C T I O N S E L E C T O R t o
+ D C V ; R A N G E t o . 0 1 5 V .
C h a n g e 1 5-9/(5-10 Blank)
Model 410C
TM 11-6625-1614-15 b . A d j u s t D C S t a n d a r d ( H - P M o d e l 7 4 0 A ) t o a p p l y . 0 1 5 t o M o d e l
410C .
c . M o d e l 4 1 0 C s h o u l d r e a d f u l l s c a l e .
I f n o t , a d j u s t A 6 R 1 8 f o r p r o p e r p o i n t e r d e f l e c t i o n .
d . R e s e t M o d e l 4 1 0 C R A N G E t o 1 5 0 0 v . A d j u s t d c s t a n d a r d f o r
1 0 0 0 v o u t p u t .
e . A d j u s t A 3 R 3 0 f o r M o d e l 4 1 0 C r e a d i n g o f 9 8 5 v ( 1 % l o w ) .
f . I f a n e r r o r g r e a t e r t h a n ± 2 % o f f u l l s c a l e e x i s t s o n a n y r a n g e b e t w e e n 0 . 5 v a n d 1 5 0 0 v I n c l u s i v e , s e l e c t n e w s e t t i n g f o r
A 3 R 3 0 t o y i e l d b e s t r e s u l t s o v e r t h e s e r a n g e s . I f e r r o r g r e a t e r t h a n ± 2 % o f f u l l s c a l e s t i l l e x i s t s o n a n y o f t h e a b o v e r a n g e s , r e a d j u s t A 6 R 1 8 t o r e d u c e e r r o r .
g . I f e r r o r g r e a t e r t h a n ± 2 % o f f u l l s c a l e e x i s t s o n a n y r a n g e b e t w e e n 1 5 m v a n d 1 5 0 m v i n c l u s i v e , s e l e c t n e w s e t t i n g f o r
A 6 R 1 8 t o y i e l d b e s t r e s u l t s o n t h e s e r a n g e s .
I f e r r o r g r e a t e r t h a n ± 2 % o f f u l l s c a l e s t i l l e x i s t s o n a n y o f t h e a b o v e r a n g e s , r e a d j u s t A 3 R 3 0 t o r e d u c e e r r o r .
h . I f e r r o r g r e a t e r t h a n ± 2 % o f f u l l s c a l e e x i s t s o n b o t h 1 5 m v t o 1 5 0 m v a n d 0 . 5 v t o 1 5 0 0 v r a n g e s , s t a r t b y r e a d j u s t i n g
A 6 R 1 8 t o c o r r e c t 1 5 m v a n d 1 5 0 m v r a n g e .
O n c e t h e y a r e w i t h i n s p e c i f i c a t i o n , p r o c e e d t o r e a d j u s t A 3 R 3 0 t o c o r r e c t 0 . 5 v t o
1 5 0 0 v r a n g e e r r o r .
5-33. OHMS ADJUST (R3).
a . Set Model 410C FUNCTION SELECTOR to ORMS; RANGE to RX10M.
5 - 1 1
5 - 1 2
TM 11-6625-1614-15
Model 410C b . S h o r t O H M S a n d C O M c a b l e s . M o d e l 4 1 0 C s h o u l d r e a d z e r o .
c . V a r y M o d e l 4 1 0 C R A N G E s w i t c h t h r o u g h r e m a i n d e r o f O H M S s e t t i n g s .
M e t e r s h o u l d r e a d z e r o , e x c e p t a t R X 1 0 w h e n m e t e r s h o u l d r e a d a b o u t 0 . 1 o h m ( r e s i s t a n c e o f l e a d s ) .
d . D i s c o n n e c t O H M S a n d C O M c a b l e s . M o d e l 4 1 0 C m e t e r s h o u l d r e a d .
I f n o t , s e t O H M S A D J ( r e a r p a n e l ) f o r r e a d i n g .
C h e c k s r e a d i n g o n a l l O H M S R A N G E s e t t i n g s .
5-34. AC ZERO ADJUST.
a . Set Model 410C FUNCTION SELECTOR to ACV; RANGE to .5 V.
b . S e t A C Z E R O v e r n i e r o n f r o n t p a n e l t o c e n t e r o f r o t a t i o n .
c . S h o r t M o d e l 4 1 0 C a c P r o b e a n d a c p r o b e c o m m o n ( s h o r t l e a d ) .
d. Adjust R1 for Model 410C zero deflection.
5-35. AC FULL SCALE ADJUST (.5 V RANGE).
a . C o n n e c t M o d e l 4 1 0 C a c p r o b e t o v o l t m e t e r c a l i b r a t o r o u t p u t t e r m i n a l s .
Set Model 410C FUNCTION SELECTOR to ACV; RANGE to
5 0 0 v .
b . A d j u s t v o l t m e t e r c a l i b r a t o r t o p r o v i d e 3 0 0 v , 4 0 0 c p s - r m s o u t p u t .
M o d e l 4 1 0 C s h o u l d r e a d 3 0 0 v ( ± 3 % ) . I f n o t , a d j u s t A 6 R 1 4 f o r p r o p e r r e a d i n g .
c . C o n t i n u e t e s t f o r r e m a i n d e r o f M o d e l 4 1 0 C a c r a n g e s u s i n g
s e t t i n g s p r o v i d e d i n T a b l e 5 - 8 .
5-36. TROUBLESHOOTING PROCEDURE.
5 - 3 7 . T h i s s e c t i o n c o n t a i n s p r o c e d u r e s d e s i g n e d t o a s s i s t i n t h e i s o l a t i o n o f m a l f u n c t i o n s .
T h e s e p r o c e d u r e s a r e b a s e d o n a s y s t e m a t i c a n a l y s i s o f t h e
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 Pro-
An investigation should also be made to insure that the trouble is not a result of conditions external to the Model 410C.
5-38. Conduct a visual check of the Model 410C for possible burned or loose components, loose connections, or any other obvious conditions which might suggest a source of trouble.
5-39. Table 5-9 contains a summary of the front-
panel symptoms that may be encountered. It should beueed in initial efforts to select a starting point for troubleshooting operations.
5-40. Table 5-10, in conjunction with Figure 5-5,
contains procedures which may be used as a guide in
isolating malfunctions. The steps in Table 5-10 des-
cribe the normal conditions which should be encountered during the checks ( circled numbers in
5-41. The checks outlined in Table 5-10 are not de-
signed to measure all circuit parameters, rather only to localize the malfunction. .Therefore, it is quite possible that additional measurements will be required to completely isolate the problem. Amplifier gain may also vary slightly between instruments; therefore it should not be necessary to precisely duplicate waveforms or values described.
5-42. Voltage values indicated in Table 5-10 are based
on .5 vdc input, with Model 410C RANGE switch set to
.015 v.
5-43. When required, check power supply voltages
as outlined in Paragraph 5-29.
5-44. Refer to Figure 5-9 for typical waveforms
encountered in the Model 410C. Waveforms represent signals which occur when instrument is operating during overdriven conditions (.5 vdc input to .015 v
RANGE).
5-45. SERVICING ETCHED CIRCUIT BOARDS.
5-46. The Model 410C has three etched circuit
01566-2
5 - 1 4
Figure 5-5. Troubleshooting Tree
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.
When working on these boards, observe the following general rules.
a. Use a low-heat (25 to 50 watts) small-tip soldering iron, and a small diameter rosin core aoider.
b. Circuit components can be removed by placing the soldering iron on the component lead on either aide of the board, and pulling up on lead. If a component is obviously damaged, clip leads as close to component as possible and then remove. Excess heat can cause the circuit and board to separate, or cause damage to the component.
TM 11-6625-1614-15
Model 410C c. Component lead hole should be before inserting new lead.
cleaned d. To replace components, shape new leads and insert them in holes. Reheat with iron and add solder as required to insure a good electrical connection.
e. Clean excess flux from the connection and adjoining area.
f. To avoid surface contamination of the printed circuit, clean with weak solution of warm water and mild detergent after repair. Rinse thoroughly with clean water. When completely dry, spray lightly with Krylon (#1302 or equivalent).
5-48. CHOPPER ASSEMBLY INSTALLATION.
a . F i g u r e 5 - 6 d e s c r i b e s t h e p h y s i c a l o r i e n -
tation of chopper assembly on printed circuit board. Note location of chopper assembly serial number in relation to circuit board pins.
F i g u r e 5 - 6 . A 4 C h o p p e r A s s e m b l y I n s t a l l a t i o n
5 - 1 5
01566-2
TM 11-6625-1614-15
Model 410C
Table 5-9.
01566-2
5 - 1 6
TM 11-6625-1614-15
Model 410C
Figure 5-7.
Table 5-10.
5 - 1 7
TM 11-6625-1614-15
Model 410C
Figure 5-11.
Model 11036A AC Probe (Exploded View)
5 - 2 2
Figure 5-12. Model 11036A AC Probe Schematic
01556-2
TM 11-6625-1614-15
Figure 5-8.
Power Supply Schematic
5-19
TM 11-6625-1614-15
5-20
Figure 5-9. Typical Amplifier Waveforms
By Order of the secretary of the Army:
HAROLD K. JOHNSON,
General, United States Army,
Chief of Staff.
O f f i c i a l :
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.
Eighth USA (5)
SAAD (5)
TOAD (5)
LEAD (3)
THE METRIC SYSTEM AND EQUIVALENTS
P I N : 0 1 6 2 8 8 - 0 0 0
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Key Features
- Measures AC and DC voltage, current, and resistance
- Measures nano-amperes of current
- Has a wide frequency range (10 Hz to 1 MHz)
- Has a high input impedance (10 MΩ)
- Has a low input capacitance (less than 2 pF)
- Has a built-in calibration source
- Has a rugged construction
- Is easy to use
- Is portable
- Is affordable