SERVICE AND CALIBRATION MANUAL BOONTON ELECTRONICS 4530 SERIES RF PEAK POWER METER MODELS 4531 AND 4532 REV DATE 9/14/07 P/N 98405100A BOONTON ELECTRONICS a WIRELESS TELECOM GROUP COMPANY 25 EASTMANS ROAD ■ PARSIPPANY, NEW JERSEY 07054-0465 TELEPHONE: (973) 386-9696 ■ FAX: (973) 386-9191 ■ E-MAIL: boonton@boonton.
CONTENTS Contents 2 Section 1. 4530 Series Test Procedure 3 Section 2. 4530 Series Calibration Procedure 11 Section 3. 4530 Series Block Diagrams 23 Section 4.
Section 1: 4530 Series Test Procedure Note: The following procedures assume that the technician is familiar with the basic menu operation of the 4530 Series. To select menu items, press the MENU key twice to return to the top-level menu, and then use the up and down arrows to highlight the desired entry. Once highlighted, the right arrow or Enter key is used to select that entry. The ESC key aborts a menu entry, and the left arrow moves back one level in the menu hierarchy.
) TESTING DSP BOARD POWER SUPPLY a. Locate the DSP Board: large pc board on bottom of chassis b. Verify the main supply voltages at the following testpoints: TP2 =+5.00VDC +/-0.25V TP3 = +15.00 VDC +/- 0.25V TP4 = +5.00 VDC c +/-0.25V TP5 = +2.50 VDC +/-0.25V TP7 = -5.00 VDC +/-0.25V TP8 = -15.00 VDC +/-0.25V TP10 = +8.00 VDC +/-0.25V TP11 = -8.00 VDC +/-0.25V 5) BASIC SYSTEM CHECK AND SETUP a.
k. Press and hold the ON/STBY key. Verify that the instrument turns off (enters standby mode) within 0.5 seconds of key being pressed. l. Press ON/STBY key again to turn on. 6) SENSOR DETECTION a. Plug in a CW power sensor into the 4530 “Sensor 1” connector and verify that the 4530 can read the sensor data (a “reading sensor…” message will be displayed). For two-channel instruments (Model 4532), repeat for the “Sensor 2” connector. b.
5. Set up the 4400/4500 instrument as the source for the pulsed calibrator signal as follows: Cal Output On Set Level: 10.0 dBm. Max Power: +20.0 dBm. Cal Mode Pulse Pulse Source Ext Polarity + b. Connect and Calibrate a peak sensor on channel 1: 1. Plug in a 57518 peak power sensor into the 4530 “Sensor 1” connector. 2. From front panel controls, select Zero/Cal > AutoCal. Use the left-arrow key to select Sensor 1, and press Enter to begin the autocal. The instrument will take about 1.
l. Monitor the VIDEO OUT 1 on the rear panel of the 4530 with the oscilloscope. Verify that the waveform displayed is a 100kHz squarewave with a peak-to-peak amplitude of 1.7V +/- 0.3V. It is acceptable for the falling edge to decay slowly near the bottom – similar to the waveform that displayed on the 4530. m. Set Main Menu > Chan 1 > Params > Video BW to “Low”, then press the Graph key again. n.
9) CHANNEL 1 CW ACQUISITION TESTS a. Select internal calibrator and turn on at 0dBm: Display the Main Menu > Calibratr menu to determine which calibrator is currently selected. If the bottom line indicates “SelectInt”, then highlight that line and press Enter to select the internal calibrator. If the bottom line indicates “SelectExt”, then the internal calibrator is already selected. Set Main Menu > Calibratr > Int Level to 0.0dBm. Set Main Menu > Calibratr > Int Signal to “On”. b.
b. Plug in the CW sensor cable into the 4530 Sensor 2 connector and connect a model 51075 CW sensor to the 4530 Calibrator. Set Main Menu > Chan 2 > MeasMode to “CW”. Set Main Menu > Chan 2 > Params > dB Offset to 0.00dB. Set Main Menu > Chan 2 > Params > Frequency to 0.05GHz. Set Main Menu > Chan 2 > Params > Filter to “Auto”. Set Main Menu > Chan 1 > Params > Range to “Auto”. c. Zero the sensor: Press the Zero/CAL key. Select “Zero Chan”. Press Enter.
12) CHANNEL 2 PEAK ACQUISITION TESTS (Model 4532 only) a. Select internal calibrator and turn on at 0dBm: Display the Main Menu > Calibratr menu to determine which calibrator is currently selected. If the bottom line indicates “SelectInt”, then highlight that line and press Enter to select the internal calibrator. If the bottom line indicates “SelectExt”, then the internal calibrator is already selected. Set Main Menu > Calibratr > Int Level to 0.0dBm. Set Main Menu > Calibratr > Int Signal to “On”. b.
Section 2: 4530 Series Calibration Procedure Note: The following procedures assume that the technician is familiar with the basic menu operation of the 4530 Series. To select menu items, press the MENU key twice to return to the top-level menu, and then use the up and down arrows to highlight the desired entry. Once highlighted, the right arrow or Enter key is used to select that entry. The ESC key aborts a menu entry, and the left arrow moves back one level in the menu hierarchy.
1) BASIC SYSTEM CHECK AND SETUP a. Turn ON rear panel power switch b. Press ON/STBY key on front panel. c. The display should show a start-up screen, the BOONTON logo, and then the main menu of the 4530. Check that the fan is operating. If the menu is not shown, press the Menu key. d. Press and hold the ESC/Stop key while using the UP and DOWN keys to adjust the display contrast. e. Select Main Menu > Utilities > SystemInf. Note the software version date.
2) Calibrator Signal Check a. Press ON/STBY key on front panel. The instrument should power up with the calibrator off. b. With the calibrator output still off, connect a spectrum analyzer with a 50 ohm input impedance to the Calibrator connector. Scan from 1MHz to 1GHz for any signals above –80dBm. c.
3) 50MHz Calibrator RF Alignment Note: The calibrator alignment adjustment is sealed at the factory during initial calibration, and should not require routine adjustment. This procedure should only be performed if a new calibrator has been installed in the instrument or if the output or AGC tests in the previous section failed. Warning Extreme caution should be used when handling the 4530 with the cover removed. High voltages are present at the Power supply. Components inside are ESD Sensitive. a.
4) CW Channel Input Current Offset Adjustment Warning Extreme care should be used when handling the 4532 with the cover removed. High voltages are present at the Power supply. Components inside are ESD Sensitive. a. Turn off the 4530 and disconnect power from the instrument. Remove the instrument’s cover by removing the 4 screws in the rear. Place the 4530 upside down on the bench and reconnect power. Turn on the instrument and allow several minutes warmup time. b.
500K. e. Connect the 2510 output to the 4530’s Sensor 1 (or 2) input using a CW SENSOR DATA ADAPTER. f. Zero the channel as follows: Pressing the Zero/CAL key. Select the appropriate channel by pressing < or >. Select Zero Chan and press Enter, and wait for the zeroing process to complete. g. Set the 2510 Range to 6B and set its Output to ON. h. Send “$DCCAL:R1:C1” to the 4530, (“…C2” for channel 2). Look for any error messages on the 4530. i. Set the 2510 Range to 4. j.
Construct the calibration setup as shown below. The use of a second 4530 (“reference powermeter”) to make the calibration measurements is the preferred method, but is not strictly necessary. Since all readings are relative to the test calibrator’s output, there is no requirement that the reference powermeter have high absolute measurement accuracy.
[Set Ref] means to place Meas4530 into reference (ratiometric) mode and load the current power level as a reference. This process is detailed in step (j) below, and all other steps should use the same procedure. Procedure Summary The transfer calibration is performed in two steps. First, the variable output oscillator is calibrated.
j. [Set Ref]: First [Select 2520], and then once the reading has settled, place Meas4530 in reference mode and load a reference level corresponding to the current output level of the 2520. The reading should indicate 0.000 dBr once the reference is loaded. Loading the reference is done as follows: Press the Text key twice. This displays a menu at the top of the display. Scroll left or right until Ld/ClrR is selected then press the UP arrow key to load the current reading as a reference.
OR Send “CAL1:INT:ZERO” to the Meas4530, and wait for the zeroing process to complete. u. Send “$CAL:DAC [DtoA1]; $CAL:ATTEN [attenuator_step]” to the UUT, where the first [attenuator_step] is 70. This sets the calibrator’s oscillator to the full scale power level (approximately +20dBm) with the step attenuator set for 70dB attenuation, for an output of –50dBm. v. Set the 2520’s RF output to the current step’s calibrator output level (-50dBm for the first step), and turn “ON” w.
e. Zero the reference powermeter as follows: Pressing the Zero/CAL key. Select the appropriate channel by pressing < or >. Select Zero Chan and press Enter, and wait for the zero process to complete. OR Send “CAL1:INTERNAL:ZERO” to the Meas4530. f. Configure the measurement and display settings on the Meas4530: Select Main Menu > Channel 1 > Parameters > Filter time 4 secs Select Main Menu > Channel 1 > Parameters > Frequency 0.
OR Send “CALC1:MATH CH1” to the UUT. n. Perform an AutoCal on the sensor using the UUT’s new calibration: Pressing the Zero/CAL key. Select the appropriate channel by pressing < or >. Select AutoCal and press Enter, and wait for the AutoCal process to complete. OR Send “CAL1:INTERNAL:AUTOCAL” to the UUT. o. Set the 2520’s RF output to -60dBm & “OFF”, and then connect the sensor to the 2520. p. Set the 2520’s RF output to -60dBm & “ON”, and record the power reading at each of the following signal levels.
Section 3: 4530 Series Block Diagrams BOONTON ELECTRONICS a WIRELESS TELECOM GROUP COMPANY 23
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Section 4: 4530 Series Drawings BOONTON ELECTRONICS a WIRELESS TELECOM GROUP COMPANY 27
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4530 Host Printed Wiring Assembly BOONTON ELECTRONICS a WIRELESS TELECOM GROUP COMPANY 32
Appendix: Entering Data into Boonton Peak and CW Sensors The information supplied in this document is not for general distribution. It should only be used by qualified calibration and metrology personnel. Boonton Electronics is not responsible for measurement errors or operability problems caused by the improper programming of sensors.
Format type, sensor type, month of manufacture, day of manufacture, year of manufacture, serial number, month of calibration, day of calibration, year of calibration, attenuation, impedance, pulse power bottom of range, pulse power top of range, CW power bottom of range, CW power top of range. Except for month, day, and year of calibration there should be NO changes made to the factory programmed data.
The following is a properly composed string to be sent to a sensor: RD-S-SLOW 2,0.50,18.00,0.00,0.00,0.50,0.15,1.00,0.00,2.00,0.23,3.00,0.34,4.00, 0.45,5.00,0.73,6.00,0.60,7.00,0.65,8.00,0.68,9.00,0.73,10.00,0.70,11.00,0.79, 12.00,0.99,13.00,1.20,14.00,1.44,15.00,1.59,16.00,1.46,17.00,1.24,18.00,0.78 (CR)(LF) After the string has been sent to the instrument, wait at least two seconds for the data to be written to the EEPROM before sending any other data over the GPIB.
SENSOR MESSAGE This is the message that displays on the bottom of the screen when the sensor report for a specific channel is called. The factory default for this message is “BOONTON ELECTRONICS a Wireless Telecom Group Company”. This message may be recalled from the sensor by using the Talk Mode Bus Mnemonic TKSMSG. The string returned from the instrument will be up to 253 characters long terminated by a (CR) and (LF).
normal operation, this feature provides for power-up without repeating the Auto-calibration procedure. When changing sensor EEPROM data this feature may cause confusion. When the RD-S-XXXX commands are used to write new data into a sensor’s EEPROM, any sensor data stored in the instruments non-volatile memory is NOT disturbed. Therefore, a previously auto-calibrated sensor will continue to use the old data until the instrument reads the EEPROM again.
