Cal Ibration Curves - HP 3562A Service Manual

MODEL 3562A
The self-calibration process consists of taking various measurements then generating
cal ibration curves. These curves are used to correct measurements before they are displayed
(the A7 FPP includes i n i t s measurement process a complex multiply by a calibration
correction curve). Since the calibration adjustments are done to the measurement after
it i s taken, the input assemblies remain unchanged by the calibration process (except for
the value put in the common mode rejection DAC, refer to 6-7 for a description of the
common mode rejection DAC). The following measurements are taken to produce the

cal ibration curves:

Free-run measurement using the fi x ed sine from the analog source (this measurement
is used to set the common mode rejection DAC on the A33, A35 Input assemblies)
Single channel triggered measurements using the calibrator (Pseudo Random Noise
Source subblock (PRN), the inverse of the PRN, and the 64 kHz square wave)
Free-run frequency response measurement using the periodic chirp from the analog
source
Free-run measurement using the fixed sine from the analog source
Press the HP 3562A keys as follows to display an example of the calibration curves:
PRESET
RA N G E
SOU RCE
W I N D OW
A & B
PAU SE/CO N T .
SCALE
Refer to figure 7-1 5 to see the example of the calibration curves. The range and source
level can be varied to display calibration curves for different ranges.
7-68
. . . . . . RESET
dBVrms
. . . . . . 0
. . . . . . SOURCE
LEVEL
. . . . . . UNI FRM
(NONE)
ON OFF
(toggle key)
FIXD
. . . . . . Y
SCALE
dBVrms
. . . . . . 0
. . . . . . - 51 6
dB
. . . . . . - 1 . 5, 1 .5
FAULT ISOLATION
ENTER