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HP 11757B Manual
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HP 11757B Manual

HP 11757B Manual

Multipath fading simulator
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Notice
Hewlett-Packard to Agilent Technologies Transition
This documentation supports a product that previously shipped under the Hewlett-
Packard company brand name. The brand name has now been changed to Agilent
Technologies. The two products are functionally identical, only our name has changed. The
document still includes references to Hewlett-Packard products, some of which have been
transitioned to Agilent Technologies.
Printed in USA March 2000

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Summary of Contents for HP 11757B

  • Page 1 Notice Hewlett-Packard to Agilent Technologies Transition This documentation supports a product that previously shipped under the Hewlett- Packard company brand name. The brand name has now been changed to Agilent Technologies. The two products are functionally identical, only our name has changed. The document still includes references to Hewlett-Packard products, some of which have been transitioned to Agilent Technologies.
  • Page 2 Making Measurements with the HP 11757B Multipath Fading Simulator SERIAL NUMBERS Attached to the rear panel of the instrument is a serial number plate. The serial number is in the form: 0000A00000. The rst four digits and the letter are the serial number pre x.
  • Page 3 Contacting Agilent By internet, phone, or fax, get assistance with all your test and measurement needs. Table 1-1 Contacting Agilent Online assistance: www.agilent.com/find/assist United States Latin America Canada Europe (tel) 1 800 452 4844 (tel) (305) 269 7500 (tel) 1 877 894 4414 (tel) (+31) 20 547 2323 (fax) (305) 269 7599 (fax) (905) 282-6495...
  • Page 4 Dynamic S-Curve Measurement Hysteresis M-Curve Measurement Recovery Time Test Bit Error Rate Test If you have an option 001 HP 11757B Multipath Fading Note Simulator, this guide does not apply to your instrument. Use the Operating and Programming Reference. The tests detailed in this guide use a Bit Error Rate...
  • Page 5 ERROR PULSE INPUT variable threshold is only available in serial pre xes 3235A and above. The HP 11757B will always trigger on the rising edge of signals applied to the ERROR PULSE INPUT connector. The ALARM INPUT connector is always terminated in TTL/10k .
  • Page 6 HP 11757B Digital Radio Testing to connect the \ERROR PULSE" of the BERT to the ERROR PULSE INPUT of the Fader, you must also connect an Alarm line from either your radio or your BERT to the ALARM INPUT line of the Fader. This...
  • Page 7 Digital Radio Testing HP 11757B Static M-Curve Measurement 1. The basic setup for all measurements involves Equipment Setup interrupting the IF path of the digital radio with a fading simulator. If a Bit Error Rate Tester (BERT) is used, connect the appropriate data channels. In...

  • Page 8: Radio Setup

    HP 11757B Digital Radio Testing Figure 1-1. Static M-Curve Measurement Test Setup 4. Connect the Fader, BERT and Digital Radio as shown in gure 1-1. 5. Press . Use the key until the display 4 MEAS TYPE 5 shows , then press...
  • Page 9 Digital Radio Testing HP 11757B Error pulse input variable threshold is only available in serial pre xes 3235A and above. 5. The display next reads . You will not 2 ALARM POL need to set this unless you are planning to use the ALARM INPUT for this test.

  • Page 10: Measurement Setup

    HP 11757B Digital Radio Testing AGC power over. Press to see what value 4 ENTER 5 this is set to. Use the arrow or data entry keys to set a value. Use a value close to the radio's channel bandwidth, then press 4 ENTER 5 10.
  • Page 11 Digital Radio Testing HP 11757B frequencies for the notch. Press to access 4 ENTER 5 STRT FR, then use the arrow or data keys to set a value in MHz (use 45 for this example), then press . The display should show...

  • Page 12: Printing Results

    HP 11757B Digital Radio Testing ignored for Static M-Curve measurements. Press to move to the next feature. 10. The display should then read \ ". 10 EDGE ZOOM This feature increases measurement resolution near the edges of the measurement, but will only be activated if you have speci ed at least 15 data points (we speci ed just 11 earlier in this example).
  • Page 13 Digital Radio Testing HP 11757B Press to set the printout for the 4 ENTER 5 INTERN internal thermal printer. Once the destination has been set, you do not need to Note reset it before every printing. is the PRESET NONE setting.
  • Page 14 HP 11757B Digital Radio Testing Dynamic M-Curve Measurement 1. The basic setup for all measurements involves Equipment Setup interrupting the IF path of the digital radio with a fading simulator. If a Bit Error Rate Tester (BERT) is used, connect the appropriate data channels. In the...
  • Page 15 Digital Radio Testing HP 11757B Figure 1-2. Dynamic M-Curve Measurement Test Setup 4. Connect the Fader, BERT and Digital Radio as shown in gure 1-2. 5. Press . Use the key until the display 4 MEAS TYPE 5 shows , then press...
  • Page 16 HP 11757B Digital Radio Testing Error pulse input variable threshold is only available in serial pre xes 3235A and above. 5. The display next reads . You will not 2 ALARM POL need to set this unless you are planning to use the ALARM INPUT for this test.
  • Page 17 Digital Radio Testing HP 11757B AGC power over. Press to see what value 4 ENTER 5 this is set to. Use the arrow or data entry keys to set a value. Use a value close to the radio's channel bandwidth, then press 4 ENTER 5 10.
  • Page 18 HP 11757B Digital Radio Testing frequencies for the notch. Press to access 4 ENTER 5 STRT FRQ, then use the arrow or data keys to set a value in MHz (use 50 for this example), then press . The display should show...
  • Page 19 Digital Radio Testing HP 11757B 30, 100, 300, 600 and 1200 MHz per second. Choose a value and press . Refer to gure 1-3. 4 ENTER 5 9. The display will now read \ ". This 9 DEVIATION refers to the maximum deviation of frequency the notch will take as it makes a measurement.
  • Page 20 HP 11757B Digital Radio Testing Figure 1-3. Speed and Deviation 10. The display should then read \ ". 10 EDGE ZOOM This feature increases measurement resolution near the edges of the measurement, but should only be activated if you have speci ed at least 15 data points (we speci ed just 11 earlier in this example).
  • Page 21 Digital Radio Testing HP 11757B You are now ready to make the actual measurement. Measurement Press . The display will indicate that the 4 MEAS 5 measurement is in progress. When the measurement has nished, the display will return to normal. If you...
  • Page 22 HP 11757B Digital Radio Testing Dynamic S-Curve Measurement 1. The basic setup for all measurements involves Equipment Setup interrupting the IF path of the digital radio with a fading simulator. If a Bit Error Rate Tester (BERT) is used, connect the appropriate data channels. In the...
  • Page 23 Digital Radio Testing HP 11757B Figure 1-4. S-Curve Measurement Test Setup 4. Connect the Fader, BERT and Digital Radio as shown in gure 1-4. 5. Press . Use the key until the display 4 MEAS TYPE 5 shows , then press...
  • Page 24 HP 11757B Digital Radio Testing Error pulse input variable threshold is only available in serial pre xes 3235A and above. 5. The display next reads . You will not 2 ALARM POL need to set this unless you are planning to use the ALARM INPUT for this test.
  • Page 25 Digital Radio Testing HP 11757B AGC power over. Press to see what value 4 ENTER 5 this is set to. Use the arrow or data entry keys to set a value. Use a value close to the radio's channel bandwidth, then press 4 ENTER 5 10.
  • Page 26 HP 11757B Digital Radio Testing . The display should show 4 ENTER 5 2 STOP FRQ Press and set a value using data or arrow 4 ENTER 5 keys (95 for this example), then press 4 ENTER 5 4. The next two items displayed are \ "...
  • Page 27 Digital Radio Testing HP 11757B 8. The display will then read \ ". This 8 SPEED parameter determines the peak frequency per second at which the notch oscillations will take place for Dynamic M-Curve measurements. It does not apply to S-Curve Measurements. Press 9.
  • Page 28 HP 11757B Digital Radio Testing Once the destination has been set, you do not need to Note reset it before every printing. NONE is the PRESET setting. 2. Next, print the parameters. Press , then 4 SHIFT 5 4 MEAS 5...

  • Page 29: Equipment Setup

    Digital Radio Testing HP 11757B Hysteresis M-Curve Measurement The Hysteresis M-Curve measurement uses the same Note parameters and setup as the Static M-Curve Test. 1. The basic setup for all measurements involves Equipment Setup interrupting the IF path of the digital radio with a fading simulator.
  • Page 30 HP 11757B Digital Radio Testing BERT is available and you want to use the ALARM INPUT to indicate failure. Figure 1-5. Hysteresis Measurement 4. Connect the Fader, BERT and Digital Radio as shown in gure 1-5. 5. Press . Use the...
  • Page 31 Digital Radio Testing HP 11757B the arrow or data keys. Choose a threshold setting (combined with the ERROR TERM setting) that is appropriate for your BERT, then press 4 ENTER 5 Error pulse input variable threshold is only available in serial pre xes 3235A and above.
  • Page 32 HP 11757B Digital Radio Testing Use the arrow or data keys to set the desired frequency, then press 4 ENTER 5 9. The display should now read \ ". This 6 AGC BW allows you to set the bandwidth to distribute the AGC power over.
  • Page 33 Digital Radio Testing HP 11757B press to get the next parameter. 11 is a good 4 ENTER 5 value to enter to keep the measurement time down. 3. The second and third items will be \ " 1 STRT FRQ and \ ".
  • Page 34 HP 11757B Digital Radio Testing Hysteresis M-Curve measurements. Press move to the next feature. 9. The display will now read \ ". This 9 DEVIATION applies only to Dynamic M-Curve, and will be ignored for Hysteresis M-Curve measurements. Press to move to the next feature.
  • Page 35 Digital Radio Testing HP 11757B 1. After the measurement has been completed, you can Printing Results print the results. First, set the printer destination. Press (PRINTER), then use the 4 SHIFT 5 4 MEAS 5 arrow key to select between...

  • Page 36: Recovery Time

    HP 11757B Digital Radio Testing In the recovery time test the Fader breaks the IF path of Recovery Time the digital radio and then measures the time the radio Test takes to recover lock. The time the radio is out of lock is measured at the ALARM INPUT of the Fader.
  • Page 37 Digital Radio Testing HP 11757B 1. Connect the Fader, Digital Radio, and BERT if used Equipment Setup as shown in gure 1-6. 2. Press . Use the key until the display 4 MEAS TYPE 5 shows , then press 4 ENTER 5 RECVRY 1.
  • Page 38 HP 11757B Digital Radio Testing error output of your BERT is sending one pulse for every four errors, set the scale factor to four. To set the scale factor press when 4 ENTER 5 3 SCALE FACT displayed, then use the...
  • Page 39 Digital Radio Testing HP 11757B 1. Press . This will access a series of Measurement Setup 4 MEAS SETUP 5 parameters to enter to set the Fader up for a measurement. 2. Use the to display \ ", which can be...
  • Page 40 HP 11757B Digital Radio Testing You cannot print the data in this test. However, you can Printing Results print the parameters. 1. After the measurement has been completed, you can print the parameters. First, set the printer destination. Press (PRINTER), then...

  • Page 41: Bit Error Rate Test

    Digital Radio Testing HP 11757B In the bit error rate test the Fader monitors the ERROR Bit Error Rate Test PULSE INPUT and measures the bit error rate for approximately 1 second. When started using the 4 MEAS 5 key, this test runs continuously until the 4 PRESET/LOCAL 5 key is pressed.
  • Page 42 HP 11757B Digital Radio Testing 1. Press Radio Setup 4 RADIO SETUP 5 2. The rst item displayed reads . This 0 BIT RATE need only be entered if you are using a BERT to measure recovery time to a bit error rate. Press to see what the bit rate is set to.
  • Page 43 Digital Radio Testing HP 11757B of the spectrum sent through the Fader. You may want the power level to remain constant even though you have a notch. If you are interrupting the digital radio after its own internal ALC or AGC circuitry,...
  • Page 44 HP 11757B Digital Radio Testing and use the arrow or data keys to set 4 NOTCH FREQ 5 the notch frequency you want to test at. Then press and use the arrow or data keys to set 4 NOTCH DEPTH 5 the depth you want to test at.