HP 8568B manual Resolution Bandwidth Accuracy Test, Specification &20%, 3 MHz, 10 dBm

4.Resolution Bandwidth Accuracy Test

4. Resolution Bandwidth Accuracy Test

(For instruments with Option 462, refer to Chapter 4.)

Related Adjustment 3-dB Bandwidth Adjustments

Specification &20%, 3 MHz

+lO%, 3 kHz to 1 MHz

&20% 10 Hz to 1 kHz

30 kHz and 100 kHz bandwidth accuracy figures apply only with 190% Relative Humidity, < 40°C.

Description The 3 dB bandwidth for each resolution bandwidth setting is measured with the MARKER function to determine bandwidth

accuracy. The CAL OUTPUT is used for a stable signal source.

Equipment None Required

Procedure 1. Press [INSTR PRESET).

2.Connect CAL OUTPUT to SIGNAL INPUT 2.

3.Key in spectrum analyzer setting as follows:

(CENTER FREQUENCY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 MHZ

	FREQUENCY SPAN	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)	. .5 MHz
[m)			. 3 MHz
			- 10 dBm
[	R E F E R E N C E L E V E L	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)

4.Press SCALE LIN pushbutton. Press csHIFT],[my (resolution bandwidth).

5.Adjust [REFERENCE LEVEL] to position peak of signal trace at reference level (top) graticule line. Press SWEEP [SINGLE).

6.Press MARKER [ml and place marker at peak of signal trace with DATA knob. Press MARKER In] and position movable marker 3 dB down from the stationary marker on the positive-going edge of the signal trace (the MARKER A amplitude readout should be -3.00 dB ho.05 dB). It may be necessary to press SWEEP ICONT) and adjust [CENTER FREQUENCY) to center trace on screen.

7.Press MARKER (ZJ and position movable marker 3 dB down from the signal peak on the negative going edge of the trace (the MARKER A amplitude readout should be .OO dB f0.05 dB). The 3 dB bandwidth is given by the MARKER A frequency readout (see Figure 2-6). Record this value in Table 2-8.

P e r f o r m a n c e T e s t s 2-13