Filter
Top Products
4-13 FM CALIBRATION
Models 682XXB/683XXB with Firmware Versions 1.01 to 2.10
Models 682X5B/683X5B with Firmwave Version 1.00
This procedure provides the steps necessary to perform FM calibra
-
tion. This consists of calibrating the FM Meter circuit, the Offset Bal
-
ance DAC, and the FM Gain Control DAC. The FM Gain Control DAC
is calibrated for input sensitivities in both narrow and wide FM
modes.
Equipment
Setup
Connect the equipment, shown in Figure 4-11, as
follows:
1. Interface the PC to the 682XXB/683XXB by per
-
forming the initial setup procedure, pages 4-7 to
4-12.
2. Connect the 682XXB/683XXB rear panel 10 MHz
REF OUT to the Spectrum Analyzer External Ref
-
erence input.
3. Connect the Function Generator Output to the
BNC tee. Connect one leg of the tee to the
682XXB/683XXB front panel FM IN. Connect the
other leg of the tee to the DMM input.
682XXB/683XXB MM 4-37
FM
CALIBRATION CALIBRATION
Serial
I/O
682XXB / 683XXB
COM1
or
COM2
IBM-Compatible PC
Function
Generator
10 MHz
REF OUT
EXT REF
INPUT
RF
IN
Spectrum
Analyzer
OUTPUT
FM
IN
RF
OUTPUT
BNC
Tee
INPUT
DMM
Figure 4-11. Equipment Setup for FM Calibration