units with serial number less than 500
Contents
1. 9 3 2 5 RCVR Perform 081 ar issued 10 3 2 6 TRANS Set Atten to Operate 6 10 3 2 7 RCVR Verify Post Calibration 6 11 3 2 8 SHIELDED ROOM Close Enclosure 11 3 2 9 Read Shielding 6 6 stirrer 11 3 2 10 RCVR Audio Threshold Tone 6806 12 3 3 0 MONITOR TS 31 MODE OPERATIONAL 13 3 3 1 TRANS Setup and 19 32 TRANS a 19 3 3 3 RCOVR Calibration Set Up cccccceceeeceeeecceeeeeeeeseeenaeeeeeeeeeeseeennieeeeeeeetees 14 3 3 4 RCVR Set Receiver Frequency 14 3 3 5 RCOVR Perform Calibration cccccccceceesccceceeeeeseeeeeaeeeeeeeeeesesseneeeeeeeeeeeee 15 3 3 6 TRANS Attach Ant Set Atten to Operate 6 15 3 3 7 SHIELDED ROO2. RCVR Set Receiver Freq Xmit Freq v Adjust rotary LOW HIGH coarse FREQUENCY control 1 MHz steps y Depress F DIGIT switch the FR ADJ status toggles to fine v Adjust rotary LOW HIGH fine FREQUENCY control 100 kHz steps NOTE The receiver frequency should be set to the same frequency as the transmitter RECEIVER FREQUENCY SET 879 4 MHz FREQ THOLD 80dB CAL NOT VALID 50 90 130 MONIT LEVEL dB FLASHING TEXT MODE monitor LOCK off FRQ ADJ fine NOTE The CAL NOT VALID warning will flash until a system level calibration is performed 16 3 3 5 RCVR Perform Calibration v Depress CAL switch The CAL NOT VALID message is replaced by a monitor level bar graph which indicates that the reference level is 0 dB The MONIT LEVEL numeric display also reads 0 dB RECEIVER AFTER MONITOR 879 4 MHz CALIBRATION FREQ THOLD 80dB SHIELD LEVEL lt 0dB 50 90 130 MONIT LEVEL 0dB MODE monitor LOCK off FRQ ADJ fine 3 3 6 TRANS Attach Antenna Set Atten to Operate Level v calibration cable END A from the transmitter BNC output connector v Attach an omni directional antenna via cable to the transmitter BNC output jack v Depress the ATTEN switch The attenuator mode will advance from 60 dB to the 0 dB setting 0 dB attenuation TRANSMITTER OPERATE LEVEL POWER LEVEL dBm 30dBm MODE 0 dB LOCK off FRQ ADJ fine
3. 3 3 7 SHIELDED ROOM Close Door 17 3 3 8 Operation Setup Monitor Ant 1 12 v Remove calibration cable END B from the 1 x 12 switch matrix v Re attach the monitor antennas via 30 ft cables to each of the switch matrix inputs ANT 1 ANT 12 3 3 9 Monitor Measurement Antennas 1 12 Set the switch matrix to select ANT 1 v Read and manually record the MONIT LEVEL dB v Repeat the above sequence for antennas 2 12 RECEIVER MONITOR LEVEL 879 4 MHz FREQ MONIT LEVEL 87 dB MODE monit LOCK off FRQ ADJ fine 3 3 10 RCVR Audio Threshold Tone Usage v Depress the gt THRESHOLD switches until the desired threshold is set Plug a set of 32 ohm Walkman type headphones in the jack on the top face of the unit v Ifthe monitor level gt threshold no tone sounds v Ifthe monitor level lt threshold a variable tone is emitted Low frequency tones correspond to low poor shielding levels while high frequency tones signify high better shielding levels 3 4 0 3 4 1 3 4 2 18 BROADBAND MODE SNIFFING OPERATIONAL SEQUENCE TRANS Setup and Power On Attach antenna of suitable frequency range to transmitter BNC output Open enclosure door Place unit inside enclosure Rotate POWER switch to ON position to begin transmitting Depress the MODE switch until the MODE status indicates the unit is in the bb mode Depress the ATTEN switc
4. 0 to 60 dB in 10 dB steps Stability 2 5 ppm 10kHz ten years Charger AC 95 250 VAC 47 63 Hz at power jack DC 15V 1 0V Battery Operation 2 hours operation 90 minutes recharge Controls OFF ON MODE ATTEN FREQ TUNE LOCK LIGHT Indicators BATTERY LEVEL OUTPUT POWER MODE LOCK ATTEN LEVEL FREQ Weight 5 5 Ibs Size 11 7 H x 5 1 D x 4 9 W Figure 1 3 PAMS Overall System Specifications End to End 140 dB Dynamic Range Meas Accuracy 2 dB 110 to 0 dBm User Interface Full Alpha numeric Backlit LCD Display Dynamic range is defined as the ratio in dB of maximum transmit power to receiver noise floor 2 0 2 1 2 2 Installation The PAMS is normally shipped and transported in a shock resistant transit case Batteries for the transmitter and receiver are already contained inside the respective units Recharging the PAMS Units Remove the battery chargers from the transit case Plug the recharge jack into the recharge receptacle on the right side of the PAMS Transmitter or Receiver Plug the charger line cord into an AC source 95 250 VAC 47 63 Hz The green CHARGE light on the front face of the PAMS unit should illuminate When the unit is fully charged the CHARGE light should begin flashing When the units are fully charged remove the charging jack from the PAMS unit Unplug the chargers and the receptacle line cords from the AC supply and return them to the transit case If it be
5. DIGIT switch the FR ADJ status toggles to fine v Adjust rotary LOW HIGH fine FREQUENCY control 100 kHz steps NOTE The receiver frequency should be set to the same frequency as the transmitter RECEIVER FREQUENCY SET 879 4 MHz FREQ THOLD 80dB CAL NOT VALID FLASHING TEXT 10 50 90 130 SHIELDING LEVEL dB MODE sniff LOCK off FR ADJ fine NOTE The INITIALIZE PRESS CAL warning will flash until a system level calibration is performed 11 3 2 5 RCVR Perform System Level Calibration v Depress CAL switch The CAL NOT VALID message is replaced by a shielding level bar graph The SHIELDING LEVEL display should read nominally 60 dB NOTE The 60 dB shielding level indication offsets the 60 dB output attenuation on the transmitter RECEIVER AFTER SYSTEM LEVEL CALIBRATION SHIELD LEVEL 60dB LOCK FRQ ADJ fine 3 2 6 TRANS Set Atten to Operate Level v Depress the ATTEN switch The attenuator will advance from 60 dB to the dB setting 0 dB attenuation TRANSMITTER OPERATE LEVEL POWER OUT 30 dBm MODE cw OUTPUT ATTENUATION IS ATTEN 0 dB OdB LOCK off FRQ ADJ 100kHz NOTE The transmitter output power at the BNC is 30 dBm 1 watt when the attenuator is set to 0 dB 12 3 2 7 RCVR Verify Post Calibration Level v The Operator should read a level less than 10 dB on the SHIELD LEVEL display RECEIVER AFTER TRANSMITTER 879 4 MHz ATTENUATION REMOV
6. ED FREQ SHIELD LEVEL lt 10dB 10 50 90 130 SHIELD LEVEL 0dB MODE sniff LOCK off FRQ ADJ fine 3 2 8 Shielded Room Close Enclosure Door 3 2 9 Read Shielding Level v The Operator reads SHIELD LEVEL display RECEIVER DISPLAYING SHIELD LEVEL SHIELD LEVEL 100dB SHIELDING LEVEL OF ENCLOSURE MODE sniff LOCK off FRQ ADJ fine 13 3 2 10 Audio Threshold Tone Usage y Depress the gt THRESHOLD switches until the desired threshold is set Plug 8 Set of 32 ohm Walkman type headphones in the jack on the top face of the unit v If the shielding level gt threshold no tone sounds v Ifthe shielding level lt threshold a variable tone is emitted Low frequency tones correspond to low poor shielding levels while high frequency tones signify high better shielding levels y Depress the lock switch to toggle the control lock function With the control lock enabled the operator is protected against accidental control inputs invalidating a test RECEIVER THRESHOLD SET 879 4 MHz FREQ SHIELD LEVEL 90dB MODE LOCK FRQ ADJ fine CONTROL LOCK STATUS The PAMS Systems is now ready to test the shielding integrity of the enclosure 3 3 0 3 3 1 NOTE 3 3 2 14 MONITOR TS 31 MODE OPERATIONAL SEQUENCE Verify that the monitor antennas are installed and connected to the switch assembly inputs ANT12 Note The antennas are pre
7. M Close 16 3 3 8 RCVR Operat Set up Monitor Ant 1 12 16 3 3 9 RCVR Monitor Measurement Antennas 12 16 3 3 10 RCVR Audio Threshold Tone 6806 17 3 4 0 BROADBAND MODE SNIFFING OPERATIONAL 17 3 4 1 TRANS Setup and 17 3 4 2 SPECTRUM ANALYZER Sniffing 18 4 0 LEStaNnd NSPSCUOM ui inet 19 4 2 1 TRANS Setup and 19 4 2 2 TRANS Frequency Set to 904 2 19 4 2 3 RCVR Setup and 19 4 24 Set RCVR Freq equal to XMIT 19 425 ROVR Perorm Cal
8. User s Manual For PRAXSYM PAMS Portable Attenuation Measurement System www praxsym com 217 897 1744 PRAXSYM PRACTICAL SYSTEMS ENGINEERING Contents le INTRODUCTIONS ana att ceils 3 1 0 eee ete eee 4 1 1 Equipment ee seceaeaeceseeeeeseeciaeeeeeeeseeeees 4 4 VS 4 2 0 7 2 1 Rechargings PAMS UIits tensed 7 2 ite 7 3 0 OPG manda Genes 8 3 2 0 SEAM SNIFFING OPERATIONAL 8 3 2 1 TRANS Initial Setup and 8 3 2 2 TRANS Frequency Set 8 3 2 3 RCVR Initial Setup and 9 3 2 4 Set Receiver Frequency
9. comes necessary to remove or replace the NiCad battery pack v locate the bottom face of the unit which houses the battery compartment cover v remove 4 socket head screws from battery cover bumper v remove the 4 Phillips head screws from the battery cover lt remove the battery cover and disconnect the 2 pin connector lt slide the battery out of the compartment Safety Handling The PAMS system has been designed to survive in field usage however the following handling restrictions should be observed v Do not drop the units y Protect the units from electrostatic discharge Do not connect high power gt 1W RF sources to the BNC connectors y Do not connect DC sources to the BNC connectors 3 0 Operation This section describes the actions necessary to operate the PAMS in the SNIFF or MONITOR mode Within the text TRANS refers to the PAMS Transmitter while RCVR refers to the PAMS Receiver 3 2 0 SEAM SNIFFING OPERATIONAL SEQUENCE 3 2 1 TRANS Initial Setup and Power On Attach one of the antennas to the BNC jack located on the top face of the transmitter Open enclosure door Place the PAMS Transmitter inside the enclosure on a marked reference position Power On Rotate POWER switch to ON position and allow a 5 minute warm up period Confirm that the output power is set to 30 dBm Depressing the Attn switch sets output power Each time the Attn switch is depressed 10dB is adde
10. d to the output Once 60 dB of attenuation is added depressing the switch again will set the output attenuator to 0 dBm TRANSMITTER INITIAL STATE ON POWER UP 900 0 MHz FREQ 10 10 30 POWER OUT 30 dBm MODE cw OUTPUT ATTENTUATION ATTEN 60 dB LOCK off FRQ ADJ coarse 3 2 2 TRANS Frequency Set Adjust rotary LOW HIGH coarse FREQ control Depress F DIGIT switch FR ADJ toggles to fine Set rotary LOW HIGH fine FREQ control 100kHz steps TRANSMITTER FREQUENCY 879 4 MHz SET FREQ 10 10 30 POWER LEVEL dBm TRANSMIT FREQUENCY MODE CW ATTEN 60dB LOCK off FRQ ADJ fine 10 3 2 3 RVCR Initial Setup and Power On v Attach one of the antennas to the BNC jack located on the top face of the receiver Locate the receiver outside the enclosure on a marked reference position at least four feet from the transmitter Make sure that the receiver reference position is within view of the PAMS transmitter v Power On Rotate POWER switch to ON position Confirm that the receiver is set to SNIFF mode Depress the mode switch to rotate through the receiver modes RECEIVER INITIAL STATE 900 0 MHz ON POWER UP FREQ THOLD 80dB CAL NOT VALID 10 50 90 130 SHIELD LEVEL dB FLASHING TEXT MODE sniff RECEIVER MODE LOCK off FRQ ADJ coarse 3 2 4 Set Receiver Freq Xmit Freq y Adjust rotary LOW HIGH coarse FREQUENCY control y Depress F
11. dera eA aeei ap a rea aLaaa 19 4 2 6 TRANS Set Atten to Operate 6 19 4 2 7 Read Post Calibration 6 6 19 4 2 8 TRANS Set Atten to Operate Level 19 4 2 9 Read Operation 6 19 Introduction The Portable Attenuation Measurement System PAMS is designed to measure the shielding effectiveness of RF enclosures The operational concept of PAMS is based upon the measurement methodology outlined in MIL STD 285 Chapter 1 0 General Information provides The overall function and purpose of the equipment v A listing of included equipment v Specifications Chapter 2 Installation describes site selection unpacking and handling power requirements safety procedures preparation for reshipment and a listing of recommended accessories Chapter 3 Operation describes operational sequences necessary to perform required certification and verification Chapter 4 Test and Inspection describes tests which may be conducted to verify correct system operation 1 0 1 1 1 2 1 3 PAMS User s Manual General Information E
12. h The ATTEN status reads 0 dB BROADBAND MODE 900 0 MHz FREQ _ _ _ _ _ MODE TRANSMITTER MODE ATTEN 0 dB LOCK off FRQ ADJ coarse SPECTRUM ANALYZER Sniffing Measurements Operate the spectrum analyzer over a 750 1000 MHz band to search for leaking signals Signals generated by the broadband mode are available over the band at 25 MHz intervals 4 0 4 2 1 4 2 2 4 2 3 4 2 4 4 2 5 4 2 6 4 2 7 4 2 8 4 2 9 19 Test and Inspection TRANS Setup and Power On v Place the unit on a table 3 5 feet high v Rotate POWER switch to ON position v Allow 5 minutes for warm up TRANS Frequency Set to 904 2 MHz v Adjust rotary LOW HIGH 1 MHz steps FREQ control y Depress F DIGIT switch FR ADJ toggles to fine v Adjust rotary LOW HIGH 100 kHz steps FREQ control RCVR Setup and Power On vy Place the RCVR on a table at a range of 10 20 feet from the Transmitter v Power on rotate POWER switch to ON position RCVR Set RCVR Freq equal to XMIT Freq v Adjust rotary coarse FREQUENCY control 1 MHz steps v Depress switch the FR ADJ status toggles to fine v Adjust rotary LOW HIGH fine FREQUENCY control 100 kHz steps RCVR Perform Cal v Depress CAL switch The CAL NOT VALID message is replaced by a shielding level bar graph The SHIELD LEVEL display should read 60 dB TRANS Set Atten to Operate Level v Depress the ATTEN switch The attenuato
13. installed on site and not included in the PAMS TRANS Setup and Power On Open enclosure door Place transmitter inside enclosure Rotate POWER switch to ON position Verify that ATTEN is set to 60 dB Connect calibration cable END A to the Transmitter BNC output Connect calibration cable supplied with PAMS END B to any of the 1x12 switch matrix inputs labeled ANT1 ANT12 Set the switch matrix select knob to couple calibration cable END B to the receiver It is very important that the Output Power is set to 30dBm Power levels above 20dBm can cause permanent damage to the Receiver TRANS Frequency Set Adjust rotary LOW HIGH coarse FREQ control 1 MHz steps Depress F DIGIT switch FRQ ADJ toggles to fine Set rotary LOW HIGH fine FREQ control 100 kHz steps TRANSMITTER FREQUENCY 879 4 MHz SET 10 10 30 POWER LEVEL 30dBm TRANSMIT FREQUENCY MODE cw ATTEN 60dB LOCK off FRQ ADJ fine STATUS OF TUNE SWITCH 3 3 3 3 3 4 15 RCVR Calibration Setup Connect the 1x12 switch matrix output labeled TO RCVR to the receiver BNC input v Power On Rotate POWER switch to the ON position v Depress the mode button until the LCD mode line reads monitor RECEIVER SET TO MONITOR 900 0 MHz MODE FREQ THOLD 80dB CAL NOT VALID 50 90 130 MONIT LEVEL dB FLASHING TEXT MODE monitor LOCK off FR ADJ fine
14. quipment Purpose The Portable Attenuation Measurement System PAMS measures the shielding effectiveness of RF enclosures Both bar graph and numeric readout display the shielding level dB Equipment List Transmitter Receiver Rechargeable Battery Packs 2 each one installed per unit 9 6 V Battery Chargers 2 each AC DC Adapter 32 ohm Walkman type headphone set 12 position coax switch 6 BNC BNC RF 50 ohm cable for use in MONITOR mode Antennas 2 each extended wavelength Transit case User s manual Specifications Specifications for the PAMS transmitter and receiver are tabulated in Figures 1 1 and 1 2 Overall systems specifications are presented in Figure 1 3 Figure 1 1 PAMS Receiver Specifications Frequency Detection Mode s Measurement Range Stability Charger at power jack Battery Operation Controls Indicators Headphone Imped Weight Size 864 936 MHz CW gt 110dB 2 5 ppm AC 95 250 VAC 47 63 Hz DC 15V 1 0V 4 hours operation 90 minutes recharge OFF VOL MODE CAL FREQ TUNE T HOLD LOCK LIGHT BATTERY LEVEL SIGNAL LEVEL THRESHOLD SETTING MODE LOCK CAL STATUS FREQ FREQ ADJ 32 ohms 5 5 Ibs 11 7 H x 5 1 D x 4 9 W Figure 1 2 PAMS Transmitter Specifications Frequency 864 936 MHz Output Power 1 watt CW mode 12 dBm Broadband mode Operating Modes CW Combline 750 1000 MHz 25 MHz steps Attenuation
15. r will advance from 60 dB to the dB setting 0 dB attenuation RCVR Read Post Calibration Level v The operator should read a 0 dB level on the SHIELD LEVEL display TRANS Set Atten to Operate Level v Depress the ATTEN switch until the attenuator setting reads 30 dB 30 dB attenuation RCVR Read Operating Level v The operator should read a 30 dB 2 dB on the SHIELD LEVEL display PAMSUSERSMAN P N 900 000001 001 20
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