Agilent Technologies 856290216 Sampling Oscillator Adjustment, Sampler Match Adjustment

6. Sampling Oscillator Adjustment

2. Press (PRESET) on the spectrum analyzer and set the controls as follows:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..2126MHz Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz

3. Set the HP 3456A controls as follows:

Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC VOLTS Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lOV.MANUAL

Sampling Oscillator Adjustment

4.Connect the negative DVM test lead to A15J200 pin 6. Connect the positive DVM lead to A15J200 pin 13.

5.Adjust A15C210 VCO RANGE for a DVM reading of 5.05 V f0.05 V.

PIN 2 . . . • • . • . PIN 16

PIN 1 n . . . l

SP114E

Figure 2-12. TAM Connector Pin Locations

Sampler Match Adjustment

6.Connect the negative DVM test lead to A15J400 pin 6, and the positive DVM test lead to A15J400 pin 1.

7.Press (-1 and set the spectrum analyzer center frequency to 2302.3 MHz. This sets the sampling oscillator to 291.667 MHz.

8.Adjust A15ClOO SMPL MATCH to peak the voltage displayed on the DVM.

9.Record the displayed voltage in Table 2-11 as the displayed voltage for the sampling oscillator frequency of 291.667 MHz.

10.Press (-1 on the spectrum analyzer. Use the keypad to set the spectrum analyzer center frequency to the frequencies listed in Table 2-11. At each listed frequency, record the displayed voltage in the table.

11.If the difference between the maximum and minimum voltages is less than 0.50 V, and all voltage readings are between + . 5 and +2.5 Vdc, proceed to step 15.

12.Locate the center frequency at which the voltage is lowest. Use the keypad to set the spectrum analyzer to this frequency.

13.Readjust SMPL MATCH to set the displayed voltage to 0.8 fO.l Vdc.

14.Set the spectrum analyzer center frequency to 2302.3 MHz and repeat steps 9 through 13.

15.Move the positive DVM test lead to A15J400 pin 3. Check that the measured voltage is the negative of the voltage at pin 1, within fO.l Vdc.

16.Disconnect the DVM probes from A15J400.

Adjustment Procedures 2-35