Agilent Technologies 856290216 Hz to 3 kHz Resolution Bandwidth Out of Specification

c. Press FULL IE ADJ . Observe the DVM reading between the displayed messages

IF ADJUSTSTATUS: 300 kHz RBW and IF ADJUST STATUS: 3 kHz RBW. Duringthistime period, the voltage should be within a 2 to 10 Vdc range.

d. Observe the DVM reading while IF ADJUST STATUS: AMPLITUDE is displayed. The reading should be within the 2 to 10 Vdc range.

e. If the DVM reading is outside the range in step c but inside the range in step d, suspect a reactive component of the filter.

8.If the ALC loop is working correctly (A4J9 pin 4 within the test tolerances given), then either the output attenuator is defective, or A4U810 pin 6 (in ALC loop integrator) is outside of its +3 to +6 Vdc range.

9.Reconnect W52 (coax 9) to A5J4.

300 Hz to 3 kHz Resolution Bandwidth Out of Specification

1.If the 3 dB bandwidth of one of these filters is incorrect, suspect a failure of one of the five available sweeps from the cal oscillator sweep generator (function block Z). These sweeps are generated by changing the switch settings of A4U803 which routes signals through A4U802 and A4U804.

2.Disconnect W52 (coax 9) from A4J8.

3.Connect an SMB tee to A4J8, using a short coaxial cable with SMB connectors.

4.Connect one output of the tee to cable W52 (coax 9).

5.Connect an HP 85024A active probe to the other output of the tee.

6.Connect the output (type N connector) of the active probe to the input of the HP 8566A/B spectrum analyzer.

7.Connect the probe power cable to the HP 85623 spectrum analyzer front-panel PROBE POWER connector (you may need to use a probe power extension cable, HP 10131B).

8.Press (INSTR PRESET) on the HP 8566A/B and set the controls as follows:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.8 MHz Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 Hz Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -43 dBm Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 kHz Videobandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10kHz Sweep time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 dB/division Sweep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single

9.On the HP 8562E spectrum analyzer, press (jj] and (CAL).

10.Press FULL IF ADJ . When the display reads ADJUSTING IF: 10 kHz RBW, press cm) on the HP 8566A/B.

11.The HP 8566A/B screen illustrates frequency versus time of the cal oscillator output sweeps. See Figure 9-16. The slope of the HP 8566A/B 100 kHz resolution bandwidth is used to detect frequency changes. Sweeps that vary (greater than 30 percent) from the normal levels, trigger error code ERR 581 or ERR 582.

12.Press FULL IF ADJ . When the display reads ADJUSTING IF: 3 kHz, press (ml on the HP 8566A/B.

9-34 IF Section