Wavetek 3510 Service Manual

1.1 CALIBRATION PROCEDURE

Remove the instrument to p and bottom cover and the card cage cover. Allow a two-hour warm-up period before calibration. In general, calibration should be performed in the sequence given.

1.1.1 Power Supply

DPS14 ADJUSTMENT

Note: All measurements are made with reference to chassis ground.

+18V VOLT ADJUSTMENT – Connect the digital voltmeter to the orange +18 volt line on pin 3 of module M30-5. Set the +18V ADJ to read +18.00 V +/- .005.

-18V VOLT ADJUSTMENT – Connect the digital voltmeter to the yellow -18V volt line on pin 4 of module M30-5. Set the -18V ADJ to read -18.00V +/- .005.

+7.3V VOLT ADJUSTMENT - Connect the digital voltmeter to the green +7.3V volt line on pin 2 of module M30-5. It should read +7.3V +/-0.15. If not, add R17 or R19 to adjust the reading.

DIGITAL POWER SUPPLY ADJUSTMENT

Wavetek 3510 Service Manual

Note: On the readings, use a digital ground as reference, not chassis ground.

+5V VOLT ADJUSTMENT - Connect the digital voltmeter to the green +5V volt line on pin 12 or 13 of the digital power supply. T he r eading should be +5V +/-0.2 . If not, adjust R5.

+37V VOLT ADJUSTMENT - Connect the digital voltmeter to the brown +37V volt line on pin 16 of the digital power supply. Set the +37V ADJ on the digital power supply to read +37V +/- 0.5.

- 5V VOLT ADJUSTMENT - Connect the digital voltmeter to the red -5 V volt line on pin 10 of the digital power supply. The reading should be -5V +/-0.2.

+12V VOLT ADJUSTMENT - Connect the digital voltmeter to t he +12V volt line on pin 14 or 15 of the digital power supply. The reading should be +12V +/-0.2.

1.1.2 Test Points and Adjustment Locations

Wavetek 3510 Service Manual

1.1.3 Block Diagram of Phase Locked Loop (PLL)Sections

Wavetek 3510 Service Manual

1.1.4 PHASE LOCKED LOOP 2 ADJUSTMENT

The simplified functions of the Phase Locked Loop (PLL) ar e as follow:

Wavetek 3510 Service Manual

FREQUENCY CARD ADJUSTMENT – Connect th e digital vol tmeter to the analog

program input on pin 11 of the M32A. Recall stored setting 509. Set the M32A ADJ R39 at the Frequency Card to 0 V +/- 0.1.

PHASE LOCK VOLTAGE ADJUSTMENT – Connect the digital voltmeter to the PLL test point on pin 15 of the M32A. Using stored setting 509, adjust A on the M32A for 0V +/- 0.1. Recall stored setting 510. Adjust B on the M32A for 0V +/1 0.1. Change the frequency in 1 MHz step from 239 MHz to 200 MHz, noting the voltage on pin 15 is 0V +/- 1.0 . LEVERER CHECK – Connect the digital voltmeter to the leveler test point on pin 14 of the M32A. Change the frequency in 1 MHz step from 200 MHZ to 239 MHz, noting the voltage is 0.55V to 2.5V .

1.1.5 PHASE LOCKED LOOP 3 ADJUSTMENT

PLL3 consists of the two modules; the M33-2 and the M9W. The test point is on the module M33-2 while the adjustment contro ls are on the M9W module.

2 MHz NULL – Connect the oscilloscope to the phase lock output on pin 5 of the M33-2. Recall stored setting 524. Adjust C on the M9W for a null on the oscilloscope of less than 20 mv.

PHASE LOCK VOLTAGE ADJUSTMENT – Connect the digital voltmeter to the phase lock output on pin 5 of the M33-2. Adjust D on the M9W for -1.5V +/-0.1.

LEVELER CHECK – Connect the digital voltmeter to the leveler test point on pin 14 of the M33-2. The reading should be between 0.55 V to 2.5 V.

1.1.6 PHASE LOCKED LOOP 4 ADJUSTMENT

Calibration of PLL 4 involves modules M9W and M34, and the Sweep Drive/DAC board. Test points are located on module M34 and the Sweep Drive/DAC board, while adjustment cont ro ls are located o n module M9W and the Sweep Drive/DAC board.

PHASE LOCK VOLTAGE ADJUSTMENT – Connect the digital voltmeter to the

analog tuning input on pin 2 of the M9W. Recall sto r ed setting 501. Set the frequency step size to 50 MHz. Adjust 250 MHZ on the Frequency Card for 0V +/- 0.005.

Wavetek 3510 Service Manual

Connect the digital volt meter to the phase lock output on pin 8 of the M34. Adjust A on the M 9W for 0V +/- 1.0 .

Set the output frequency to 300 MHz and adjust 300 MHz on the Frequency Card for 0V +/- 3.0 . Repeat this step, using the applicable Frequency Card adjustment for 350, 400, and 450 MHz.

Set the output frequency to 500 MHz. Adjust 500 MHz on the Frequency Card close to 0V. Set the output frequency to 520 MHz. Readjust 500 MHz on the Frequency Card to give a symmetrical reading around 0V at 520 MHz and 500 MHz.

Recall stored setting 503. Adjust 100 MHz on the Frequency Card for 0V +/- 3.0.

Recall stored setting 504. Adjust 50 MHz on the Frequency Card for 0V +/- 3.0.

Recall stored setting 505. Adjust 1 MHz on the Frequency Card for 0V +/- 3.0.

LEVELER ADJUSTMENT – Connect the digital voltmeter to the leveler test point on pin 14 of the M34. Recall stored setting 508. Step the output frequency up in 10 MHz increments, noting the frequency o f the maximum reading. Adjust B on the

Wavetek 3510 Service Manual

M9W for 1V +/- 0.005 at that frequency.

Recall stored setting 508. Step the output frequency up in 10 MHz increment, noting the minimum voltage is greater than 0.7 V.

1.1.7 CRYSTAL REFERENCE CHECK.

LEVELER CHECK – Connect the digital voltmeter to the leveler test point on pin

14 of the M30-5. The reading should be between 0.55 V to 1.5 V.

FREQUENCY CHECK – Connect the frequency counter to the RF OUTPUT connector on the front panel. Recall stored setting 513. The reading should be 520 MHz +/- 0.0001.

1.1.8 PHASE LOCKE LOOP 5 ADJUSTMENT.

FREQUENCY ADJUSTMENT

OUTPUT connector on the front panel. Recall stored setting 513. Turn the ALC off. Adjust B on the M29-2 for 520 MHz +/- 0.001. After adjustment, turn ALC on.

2 KHz NULL ADJUSTMENT – Connect the oscilloscope to pin 10 of the M33-2. Adjust A on the bottom of the M33-2 to null the 2 KHz signal there.

–

Connect the frequency counter to the RF

Wavetek 3510 Service Manual

1.1.9 OUTPUT POWER ADJUSTMENT

Non-doubled power adjustments are located on the left side of the card. Looking at the component side with the card ejectors at the top. Doubled power adjustments are located on the right side of the card.

NON-DOUBLED POWER ADJUSTMENT – Connect the power meter to the RF OUTPUT connector on the front panel. Recall stored setting 515. Ad just +13 on the level card for +13 dBm +/- 0.1. Change the output level to +3.5 dBm. Adjust +3.5 on the level card for +3.5 dBm +/- 0.1. Change the output level to +13 dBm and repeat both adjustments as necessary.

Recall stored setting 526. Adjust +3.4 on the level card for +3.4 dBm +/- 0.1. Change the output level to -6.5 dBm. Adjust -6.5 on the level card for -6.5 dBm +/-0.1. Change the output level to +3.4 dBm and repeat both adjustments as necessar y.

DOUBLE POWERADJUSTMENT – Repeat the procedure for non-doubled power adjustments using the doubled power adjustments on the Level Card and stored setting 517 in the first paragr aph and 518 in the second.

1.1.10 Storred Settings

Wavetek 3510 Service Manual

Setting Freq

(MHz)

Level

(dBm)

Setting Freq

(MHz)

Level

(dBm) 501 250 0 520 260 2 502 510 0 521 761 2 503 100 0 522 520 -6.9 504 50 0 523 1000 -6.9 505 1 0 524 1000 -6.9 506 520.9999 0 525 520 -6.9 507 1.999 0 526 1000 13 508 1 0 527 1000 13 509 200 0 528 1000 2 510 239 0 529 1000 3 511 520 0 530 520 2 512 520 0 531 1000 2 513 520 0 532 100.003 13 514 520 0 533 239.003 13 515 100 13 534 519.003 13 516 100 2 535 100.003 13 517 761 13 536 1 13 518 761 2 537 1000 3 519 1 12 538 1000 13

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