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Model 1l049A

b. Using voltmeter as a monitor, slowly adjust

power supply output to 0.9 volts lor 1l050A
or 2. 85 volts for 1l049A.

c. Conneat voltmeter to thermoelement. Output

should be 6.5 mV ±O. 3 mV.

output is high,

increase R2; if output is low, decrease R2.

30. An alternative but not as accurate method of

selecting R2 is to assume that the thermoelement
resistunce is 90

and select R2 as 510

for the 11049A

and 110

for the 1l050A. If this method is used, the

nominal 7. 5 mV output may be high or low by as much
as 10%.

POWER SUPPLY

hp72IA

VOLTMETER

hp 419A

+ -

,:)

'NPul

OuTPuT

Figure

Selection of R2

31. SELECTION OF R1.
32. RI shunts the series combination of the thermo

element and R2 to adjust the input resistance to 50

±O. 15

and is made up of two approximately equal

resistors connected in parallel. In the 11049A Rl is
about 55

[2,

in the Il050A Rl is about 65

and in the

POWER SUPPLY

hp"i2IA

5Qn�Q.I%

0698-5418

Page 8

200ntO.I'/o

0811-2162

Figure 8. Selection of Rl

lhERMO'
El.EMENT

1105lA Rl is about 110

The resistors used for R1

should be 1/2 watt, ±5%, metal film resistors.

33. Figure 8 shows a bridge for selecting Rl. R1 is

adjusted for null with the drive voltage set so that the
thermoelement operates at near rated full scale input.
Proceed as follows.

a. With the power supply off, construct the

bridge shown in Figure 8.

Содержание 11049A

Страница 1: ...11049A 11050A 11051A THERMAL CONVERTERS HEWLETT PACKARD OPERATING AND SERVICE MANUAL ...

Страница 2: ...tion facility WARRANTY AND ASSISTANCE All Hewlett Packard products are warranted against defects in materials and workmanship This warranty applies for one year from the date of delivery or in the case of certain major components listed in the operating manual for the specified period We will repair or replace products which prove to be defective during the warranty period No other warranty is exp...

Страница 3: ...01797 2 OPERATING AND SERVICE MANUAL HP PART NO 11049 90000 MODEL 11049A 11050A 11051A THERMAL CONVERTERS Copyright Hewlett Packard Company 1967 P O Box 301 Loveland Colorado 80537 U S A Printed AUG 1967 ...

Страница 4: ......

Страница 5: ...rements 3 2 Thermal Converter Schematic Diagram 2 14 Frequency Response Measurements 3 3 Input Output Relationship 3 16 Generating an Accurate Calibration 4 Frequency Response Measurements 4 Signal 4 5 Test Signal Generation 5 22 Maintenance 6 6 Thermal Converter Calibration 6 23 Thermal Converter Calibration 6 7 Selection of R2 8 25 Repairing the Thermal Converter 7 8 Selection of Rl 8 9 Proper O...

Страница 6: ... MHz Output voltage for maximum input voltage 7 5 mV de Output impedance lOr Calibration accuracy Standard measurement Frequency range In reference to std uncertainty 20 Hz to 20 kHz within 0 01 0 02 20 kHz to 50 kHz within 0 01 0 03 50 kHz to 1 MHz within 0 01 0 06 5 Hz to 20 Hz and within 0 05 0 12 1 MHz to 10 MHz 10 MHz to 30 MHz 0 25 30 MHz to 60 MHz 0 50 60 MHz to 100 MHz 1 50 Dimensions 3 wi...

Страница 7: ...ms Model 1l049A INPUT IMPEDANCE 50 rl 0 15rl to 10 MHz OUTPUT IMPEDANCE less than 10 rl OUTPUT VOLTAGE FOR FULL SCALE INPUT Nominal 7 5 mV Table 1 Calibration Accuracy Frequency Range With Reference Measurement to Standard Uncertainty 5 Hz to 20 Hz within O 05 0 12 20 Hz to 20 kHz within to 01 0 02 20 kHz to 50 kHz within O 01 0 03 50 kHz to 1 MHz within O 01 0 06 1MHz to 10Mllz within O 05 0 12 1...

Страница 8: ...ermoelement heats the filament and the thermo electric junction generates a de voltage proportional to the filament heat Therefore the voltage out of the thermal converter is proportional to the input power Resistor R2 adjusts the current through the thermoelement to 5 mA with a full scale input and Rl adjusts the input impedance to 50 Q II049A i1050A II051A THEnMAL CONVERTER I R l AC 90D R5T INPU...

Страница 9: ...al voltmeter or differential volhneter In order to resolve an input change of 1 of full scale the output monitor should be able to resolve 0 15 mV for an input change of O 1 of full scale it should be able to resolve 14 flV 12 To build the reference supply shown in Figure 4 on the next page use a mercury battery and wirewound resistor The potentiometers should be 10 turn or 20 turn and the switch ...

Страница 10: ...hange frequency and note thermal converter output changes Remember that percent con verter output change equals twice percent in put signal change 16 GENER t TlNG AN ACCURATE CALIBRATION SIGNAL 17 The test setup inFigure 5 on the next page generates a test signal that may be used for both frequency response and absolute value calibration at any frequency within the thermal converter range A dc sta...

Страница 11: ...nverter and an averagerespondingcircuitreact diJferently to distortion and any distortion present will create a calibration error between the thermal converter and ihe instrument under test a Set test oscillator and dc standard outputs to minimum b Connect dc standard test oscillator thermal converter reference supply null meter and instrument under test as shown in Figure 5 Keep all connections a...

Страница 12: ...e quency deSired 22 MAINTENAN CE 23 THERMAL CONVERTER CALIBRATION 24 Figure 6 shows the setup for calibrating a thermal converter to an NBS calibrated reference thermal con verter With this setup the thermal converter can be calibrated to vithin O 005 of the reference thermal converter The following steps describe the calibration procedure a Sct test oscillator and both reference supply outputs to...

Страница 13: ...repair in structions in paragraph 25 L The calibration of a thermal converter should Model l1049A be checked against an NBS reference thermal converter at least once every six months during the first year and once a year there after 25 REPAIRlNG THE THERMAL CONVERTER 26 If the thermal converter is out of calibration below 10 MHz or if it has no output the UHF thermoelement should be replaced Since...

Страница 14: ...lj5 UP J NPul OuTPuT Figure 7 Selection of R2 31 SELECTION OF R1 32 RI shunts the series combination of the thermo element and R2 to adjust the input resistance to 50 Q O 15 Q and is made up of two approximately equal resistors connected in parallel In the 11049A Rl is about 55 2 in the Il050A Rl is about 65 Q and in the POWER SUPPLY hp i2IA 5Qn Q I 0698 5418 Page 8 200ntO I o 0811 2162 Figure 8 S...

Страница 15: ... initial value of Rl as shown in Figure 8 For 11049A use two 120 Q resistors in parallel for l1050A use a 150 Q and a 120 Q resistor in parallel for 11051A use two 220n resistors in parallel c Adjust drive voltage from power supply to the following value 1l049A 1l050A 1l051A 5 0 volts 1 5 volts O 6 volts ...

Страница 16: ...nverter 36 Observe the following precautions when installing replacement thermoelement and Rl and R2 Page 10 USE AN ADEQUATE HEAT SINK WHEN SOLDERING CONNECTIONS TO THERMO ELEMENT EXCESSIVE HEATING WILL CHANGE THERMOELEMENT CHARAC TERISTICS a Keep all leads as short as possible b Make sure that component mounting matches that shown in Figure 9 c Avoid bending thermoelement leads any more than is a...

Страница 17: ...ss and Brittain Lug grounding P R Mallory Co Nut hex 3 8 H M Harper Co Bushing insulator Goe Engineering Co Terminal output Goe Engineering Co Thermoelernent UHF 90 l 5 rnA Best Products Ltd Can shield hp Cover top hp Screw machine hardware for top Schnitzer Alloy cover no 6 32 thread brass Prod Inc Figure 10 Replaceable Parts Model 11049A Mfr Part No TQ 30337 2 1 1920 02 3 A 131023 1 2 Obd 1 HP 3...

Страница 18: ...h the thermoelement input R3 is made up of two 10 1 1 1 8 W resistors hp Part No 0757 0346 in parallel and is added to adjust the nominal 7 5 111V output R3 may not be present on all instruments it is added only to adjust out of tolerance outputs 2 On page 2 at bottom of page change output relationship to t Edc input change x 100 1 7Edc 20 September 1968 11049 90000 ...

Страница 19: ...11049 90000 PRINTED IN U S A ...

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