Adjustment
Tests
The tests without asterisks are used in the procedures located in the
“Adjustments” chapter of this manual, except as noted.
44
45
46
47
48
50
51
52
53
54
*Source
Def.
Writes default correction constants for rudimentary
source power accuracy. Use this test before running test 47, below.
*Pretune Def.
Writes default correction constants for rudimentary
phase lock pretuning accuracy. Use this test before running test 48,
below.
ABUS
Cm.
Measures three
6xed
voltages on the
ABUS,
and generates
new correction constants for
ABUS
amplitude accuracy in both high
resolution and low resolution modes. Use this test before nmning test
48, below.
Source
Cm.
Measures source output power accuracy, flatness, and
linearity against an external power meter via HP-IB to generate new
correction constants Run tests 44,
45,46,
and 48 first.
Pretune
Cm.
Generates source pretune values for proper phase-locked
loop operation. Run tests 44, 45, and 46 first.
Disp
2
Ex.
Not used in “Adjustments.” Writes the “secondary test
pattern” to the display for adjustments. Press (Preset to exit this
routine.
IF
Step
Cm.
Measures the gain of the IF
ampliliers
(A and B only)
located on the A10 digital IF, to determine the correction constants for
absolute amplitude accuracy. It provides smooth dynamic accuracy and
absolute amplitude accuracy in the -30
dBm
input power region.
ADC
Ofs
Cm.
Measures the
A10
Digital IF ADC linearity
characteristics, using an internal ramp generator, and stores values
for the optimal operating region. During measurement, IF signals are
centered in the optimal region to improve low-level dynamic accuracy.
Sampler
Cm.
Measures the absolute amplitude response of the
R sampler against an external power meter via HP-IB, then compares
A and B, (magnitude and phase), against R. It improves the R input
accuracy and
AAYR
tracking.
Cav
Osc
Cm.
Calculates the frequency of the cavity oscillator and the
instrument temperature for effective spur avoidance.
Service Key Menus and Error Messages
lo-13
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