E8257D/67D, E8663D PSG Signal Generators Service Guide
Post–Repair Procedures
Post–Repair Procedures Matrix
4-8
DC FM Calibration (E8257D/E8663D with Option UNT)
✓
External Input Peak Detector Calibration (E8257D/E8663D with
Option UNT)
✓
Quadraplier Download (E8257D with Option 550 or 567 or E8257N
with Option 550 Only)
✓
High Band ALC Linearity Calibration
✓
High Band Power Flatness Calibration
✓ ✓ ✓ ✓
High Band High Power ALC linearity Calibration (E8257D with Option
521 Only)
✓
High Band ALC Modulator Calibration
✓ ✓ ✓
Low Band ALC Linearity Calibration
✓
Low Band Power Flatness Calibration
✓ ✓
ALC Modulator Offset DAC Sensitivity Calibration
✓
High Band Scan Modulator Calibation (E8257D/E8663D with option
HSM or 1SM)
✓
V- Band Power Flattness Calibration (E8257D with Option 567 Only)
✓ ✓
V- Band Low Power Attenuator Accuracy (E8257D with Option 567
and 1E1 Only)
✓ ✓
V- Band ALC Modulator Calibration (E8257D with Option 567 Only)
✓
Low Power Attenuator Accuracy (E8257D/E8663D with Option 1E1
and E8257N Only)
✓ ✓
a
Requires adjustments to pass self test.
Table 4-7 Performance Tests: Assemblies A1—A17 (For Prefixes < xx4928)
Performance Tests
The
following performance tests are listed in the order
that they should be performed to minimize changes
in test equipment configurations.
Replaced Assembly
A1 Keyboard
A2 Display
A2DS1 Backlight
A3 Power Switch
A4 Inverter
A5 Sampler
A6 Frac–N
A7 Reference (Standard)
A7 Reference (Option UNR/UNX)
A8 Output (Analog)
A8 Output (Digital)
A9 YIG Driver
A10 ALC
A11 Pulse/Analog Mod Gen
A12 Lowband Fast Pulse
A13 IQ Multiplexer
A14 Baseband Generator
A17 Baseband Generator Interface
Self Tests
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Maximum Leveled Output Power
✓ ✓ ✓ ✓
Power Level Accuracy
✓ ✓ ✓
Internal Pulse Modulation Level Accuracy
✓ ✓ ✓ ✓
Internal Pulse Modulation Rise/Fall Time
✓ ✓ ✓ ✓
DC FM Carrier Offset
✓ ✓
Internal FM Frequency Response
✓ ✓ ✓
External Phase Modulation Frequency Response
✓ ✓ ✓
Internal FM Distortion
✓ ✓
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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