408 E8257D/67D, E8663D PSG Signal Generators Service Guide
Post–Repair Procedures
Post–Repair Procedures Matrix
IQ Modulation Calibration
X
IQ Upconverter Gain Calibration
X
FM 1/2 Path Ratio Gain Calibration (E8257D/E8663D with
Option UNT)
X
Mod Source Relative Gain Calibration X
FM/PM YO Frequency Compensation Calibration
(E8257D/E8663D with Option UNT)
X
DC FM Calibration (E8257D/E8663D with Option UNT) X
External Input Peak Detector Calibration (E8257D/E8663D
with Option UNT)
X
Quadraplier Download (E8257D with Option 550 or 567 or
E8257N with Option 550 Only)
X
High Band ALC Linearity Calibration
X
High Band Power Flatness Calibration
X X X X
High Band High Power ALC linearity Calibration (E8257D
with Option 521 Only)
X
High Band ALC Modulator Calibration
X
X
X
Low Band ALC Linearity Calibration X
Low Band Power Flatness Calibration X X
ALC Modulator Offset DAC Sensitivity Calibration
X
High Band Scan Modulator Calibration (E8257D/E8663D
with option HSM or 1SM)
X
V-Band Power Flatness Calibration (E8257D with Option
567 Only)
X
X
V-Band Low Power Attenuator Accuracy (E8257D with
Option 567 and 1E1 Only)
X X
V-Band ALC Modulator Calibration (E8257D with Option
567 Only)
X
Low Power Attenuator Accuracy (E8257D/E8663D with
Option 1E1 and E8257N Only)
X X
Attenuator Cycle Count Reset (Service Software - Utility) X
a. Requires adjustments to pass self test.
Table 4-6 Post-Repair Adjustments:
Assemblies A27—A46, AT1, B1, and RF Output Connector (For prefixes >=
xx4928) (Continued)
Adjustments Replaced Assembly
The following adjustments are listed in the order that
they should be performed for proper calibration.
A27 40 GHz Doubler
A28 YIG Oscillator
A29 20 GHz Doubler
A30 Mod Filter
A31 Motherboard
A32 10 MHz Crystal Oscillator
A34 Internal Hard Drive
A35 3 − 20 IQ Modulator
A36 Quadraplier
A37 Up Converter
A39 Directional Coupler
A40 Flash Drive
A43 LB Amp/Filter
A44 Scan Mod
A45 Frac-N/Offset
a
A46 Offset Loop
a
AT1 115 dB Attenuator
B1 Fan
RF Output Connector
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