KVARZ CH1-76A Operating Manual Download Page 1

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CH1–76А

PASSIVE HYDROGEN

MASER

OPERATING

MANUAL

2.721.655

–

01 OM

INSTITUTE OF ELECTRONIC MEASUREMENTS “

KVARZ

”

176, Prospect Gagarina, Nizhny Novgorod, 603009, Russia.
Tel.: (+7) 831

–

4652293, (+7) 831

–

4667093.

Fax: (+7) 831

–

4652293, (+7) 831

–

4665562.

Summary of Contents for CH1-76A

Page 1: ...SSIVE HYDROGEN MASER OPERATING MANUAL 2 721 655 01 OM INSTITUTE OF ELECTRONIC MEASUREMENTS KVARZ 176 Prospect Gagarina Nizhny Novgorod 603009 Russia Tel 7 831 4652293 7 831 4667093 Fax 7 831 4652293 7 831 4665562 ...

Page 2: ...2 Fig 1 The CH1 76A Passive Hydrogen Maser ...

Page 3: ...g components during repair or component operation check as line voltage 110 115 120 220 240 V and 3 5 kV dc voltage is present Switch off the Maser before component replacement Attention Discriminator ion pump supply circuits power supply high voltage divider and check circuits marked with the warning sign of hazardous voltage have potential 3 5 kV relative to the case Safety interlock terminals a...

Page 4: ...tion 7 5 3 Design 10 5 4 Marking and Sealing 10 6 The Maser CH1 76A Setup 11 6 1 Unpacking and Repacking 11 6 2 Installation 11 6 3 Preparation for Use 11 7 The Maser CH1 76A Operation 13 7 1 Operating Controls and Connectors 13 7 2 Preparation for Measurements 16 7 3 Measurement Procedure 18 8 Specifications 19 9 Storage and Transportation 24 10 The Maser CH1 76A Composition 25 ...

Page 5: ...rogen Maser 2 5 1 The Maser CH1 76A Simplified Block Diagram 8 5 2 The Maser CH1 76A Detailed Block Diagram 9 6 1 The Maser CH1 76A Package Design 12 7 1 The Maser CH1 76A Front A and Rear B Panels 14 10 1 The Maser CH1 76A Maser Accessory Kit 26 ...

Page 6: ...76A Specifications 19 8 2 The Maser CH1 76A Errors 21 8 3 The Maser CHI 76A Interface Functions 21 8 4 The Maser CHI 76A Programmable Modes 21 8 5 Frequency Tuning Programming Code 22 8 6 Output Data Format 22 8 7 Diagnostics Data Format 22 8 8 Diagnostic Data 23 8 9 Status Byte Output 23 10 1 The Maser Composition 25 ...

Page 7: ...4057 MHz signal Finally the 1420 405 MHz excitation signal is separated directly in the discriminator RF cavity from the 100 MHz signal 14th harmonic and synthesizer signal interaction In the atomic emission line and RF cavity discriminator interaction FM signal is converted into an AM FM signal This signal envelope amplitude and phase data contain information about the crystal oscillator frequenc...

Page 8: ...8 Fig 5 1 The Maser CHI 76A Simplified Block Diagram ...

Page 9: ...9 Fig 5 2 The Maser CH1 76A Detail Block Diagram ...

Page 10: ... located in the right part An easy access to the Maser units and assemblies through the upper covers provides a high level of maintainability A removable cover on the rear panel provides access to HF Oscillator of Hydrogen Discriminator Electronic units are in Al cases and card cages for PC card insertion Interplane connection is provided by motherboards 5 4 MARKING AND SEALING Instrument name and...

Page 11: ...tor of the container if available 6 2 INSTALLATION Study Section 6 before using the Maser Check the Maser after unpacking Perform visual check and be sure that seals are preserved the kit is in accordance with Section 10 no visual mechanical defects all controls are fixed in their positions their rotation is smooth and all fuse links are present etc terminals and connectors are clean Operating ven...

Page 12: ...12 Fig 6 1 The Maser CH1 76A Package Design ...

Page 13: ...PWR AVAIL DC PWR ON LED indicator battery switches on indication 5 TIME LED indicator indicates Maser operation from battery Digital indicator current time in hours min sec Indication of synthesizer setting by FRQ ADJ code switch according to INDICATION switch position 6 ERROR Digital indicator Maser error indication in accordance with the error table on the front panel 8 TIME NUMBER Buttons curre...

Page 14: ...14 Fig 7 1 The Maser CH1 76A Front A and Rear B Panel ...

Page 15: ...th position 12 6V 9th position 5V 10th position 5 A 11th position 50 A 12th position 500 A Micro ammeter operating mode indication of power supplies and instrument separate units 17 U Button ion pump voltage check Down 19 PUMP Toggle switch ion pump switch on 20 AFC SUPPLY Toggle switch AFC unit switch on Down 21 HFO Toggle switch turns on HFO of atomic hydrogen source Down 22 IHFO Button IHFO che...

Page 16: ... Check the control positions They must be set in the initial positions as given in Table 7 1 If necessary connect the Maser to the external DC power supply 22 30 V Set Line switch position 1 in Figure 7 1 A to ON position The AC PWR indicator position 2 in Fig 7 l A must light on Set 24 V ON toggle switch position 37 in Fig 7 1 B to ON position DC PWR AVAIL indicator position 3 in Fig 7 1 A must l...

Page 17: ...st HFO current according to Table 7 2 Figure 5 at Error indication can light on for a short time During this short time there is no light on the backside of the Maser Then this light must appear and Figure 5 at Error indicator must disappear the same moment Set HFO and AFC Power switches to OFF positions Warm up the Maser during 10 hours and then Figure 4 at Error indicator must disappear for AFC ...

Page 18: ...VARZ as given in Section 13 In order to provide maximum specifications to perform precision measurements it is necessary to provide maintain temperature 1 C and avoid external magnetic field variation Check FREQ ADJ code switch set according to the Table 8 1 If the Maser is integrated into ATE it is necessary to connect it to GPIB and to set the Maser address with rear panel switch Look Section 10...

Page 19: ...ay Temperature Coefficient 2 10 14 C Magnetic Sensitivity 5 10 14 2 Oersted 2 Frequency Settability Range At least 1 10 10 1 0000 10 10 Step Size 1 10 14 Synthesizer Code Switch Nominal Position 0000 9999 ____________ Record Setting 3 Sine Output Signals 2 isolated outputs 5 MHz Amplitude 1 0 2V rms into 50 Ohm load Harmonic Distortion 30 dBc Non Harmonic Distortion 100 dBc Phase Noise SSB 1Hz B W...

Page 20: ...5 C to 40 C Non operating 0 C to 50 C Humidity Operating to 80 at 25 C Non operating to 98 at 25 C Atmospheric Pressure Operating 84 106 kPa 630 795 mm Hg Non operating 12 106 kPa 90 795 mm Hg 8 Physical Dimensions Without package 280 480 555 mm 11 19 22 In package case 682 730 800 mm 27 29 31 Weight Without package 55 kg 120 lbs In package case 105 kg 230 lbs 9 Warranty 27 months 10 MTBF 9000 hou...

Page 21: ...interface functions according to Table 8 3 THE MASER CHI 76A INTERFACE FUNCTIONS Table 8 3 Function Designation Function Name Function Capabilities SH1 Source Handshake All AH1 Accept Handshake All T6 Talker Main Talker L4 Listener Main Listener SR1 Service Request All DC1 Device Clear All DT1 Device Trigger All 2 programmable operating modes according to Table 8 3 PROGRAMMABLE OPERATING MODES Tab...

Page 22: ...0 11 2 0 0 0 2 10 11 9 0 0 0 9 10 11 Note After program data entry GET command is transmitted into GPIB 3 Data Out to GPIB Interface Output data format in mode is given in Table 8 6 OUTPUT DATA FORMAT Table 8 6 Byte Number 1 2 3 4 5 Digits 0 9 X1 X2 X3 X4 LF Note signal EOI is sent simultaneously with signal LF Output data format in diagnostic data output mode is given in Tables 8 7 and 8 8 DIAGNO...

Page 23: ...ge 1 6 Purifier is fault 1 7 No hydrogen 1 8 Low vacuum in Hydrogen Discriminator vacuum system 1 9 No 5 MHz output signal from the crystal oscillator Note X any state Z digit from 0 to 9 4 SR signal is applied to GPIB when where are error signal in the Maser 5 The Maser CH1 76A Status Byte Output GPIB in accordance with Table 8 9 STATUS BYTE OUTPUT Table 8 9 Cause Status Byte Output DI7 DI6 DI5 D...

Page 24: ...ser according to Section 6 1 Personnel acquainted with prevention and safety rules should perform periodic preventive maintenance unpacking and repacking of the Maser The Maser may be shipped in a container by all types of transport at environment temperature 50 C 50 C The Maser should be protected against atmospheric precipitates and dust Do not turn it over Time of transportation should pot exce...

Page 25: ...se links VP2B 1V 0 25A 250V 0 481 005 5 fuse links VP2B 1V 1 0A 250V 0 481 005 5 fuse links VP2B 1V 2 5A 250V 0 481 003 10 fuse links VP2B 1V 5 0A 250V 0 481 003 5 3 pc board 3 665 445 04 1 4 pc board 3 668 787 1 5 interconnecting cable 4 854 852 1 6 interconnecting cable 4 854 858 1 7 interconnecting cable 4 854 880 1 8 interconnecting cable 4 895 311 1 9 interconnecting cables 4 895 312 2 10 plu...

Page 26: ...26 Fig 10 1 The Maser CH1 76A Accessory Kit ...

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