Anritsu 683XXB, 682XXB manual Cpu Pcb

	FM
CALIBRATION	CALIBRATION

NOTE

To save the calibration data after completing any calibration step, type: calterm 787 and press <ENTER>.

4. Connect the 682XXB/683XXB RF OUTPUT to the

	Spectrum Analyzer RF Input.
	NOTE
	Before beginning this calibration proce-
	dure, always let the 682XXB/683XXB
	warm up for a minimum of one hour.
FM	The following steps in the procedure lets you cali-
Calibration	brate the (1) FM Meter circuit; (2) FM Variable Gain
Procedure	Linearity; (3) Locked, Locked Low-Noise, Unlocked
	Narrow, and Unlocked Wide FM Mode Sensitivity;
	and (4) FM Rear Panel Input Gain, and store the re-
	sults in non-volatile memary (EEPROM) on the A17
	CPU PCB.
	NOTE
	To ensure accurate calibration, each step of
	this procedure must be performed in se-
	quence.
	1. Perform FM Meter calibration as follows:
	a. At the $ prompt on the PC screen, type:
	calterm 123 and press <ENTER>.
	b. Set up the Function Generator for a 100.0 kHz
	sine wave with an output level of 0.707 volts
	￿0.01 volts RMS (2 volts peak to peak). Use a
	frequency counter to verify the output fre-
	quency of your function generator is set to
	￿1%. When done, press any key on the key-
	board to continue calibration.
	The $ prompt will appear on the screen when
	the calibration is complete.
	c. Record step completion on the Test Record.
	2. Perform FM Variable Gain Linearity calibration
	as follows:
	a. At the $ prompt on the PC screen, type:
	calterm 148 and press <ENTER>.
	b. Set up the Function Generator for a +1.00 Vdc
	output. When done, press any key on the key-
	board to continue calibration.
	The $ prompt will appear on the screen when
	the calibration is complete.
	c. Record step completion on the Test Record.

682XXB/683XXB MM 4-45