Keysight (Agilent HP) E4408B Repair Service
Product model
E4408B ESA-L Basic Spectrum Analyzer, 9 kHz to 26.5 GHzServices
Expert repair and calibration for your Agilent HP E4408B Spectrum Analyzer. We specialize in obsolete, unsupported equipment. Free evaluations.
Description
•1.1 dB overall amplitude accuracyrn•100 Hz to 5 MHz RBW, 100 Hz to 300 Hz optionalrn•+7.5 dBm TOIrn•5 minute warm-up to guaranteed measurement accuracy
Repair prices
Any failures or unforeseen issues identified during the calibration phase will be detailed in an estimate submitted for your approval prior to any further action. Repair charges are determined by the actual time and materials required. Please be aware that customers are responsible for all associated shipping costs, to and from our location. This initial estimate is provided free of charge.
E4408B Specifications – click to expand
E4408B Specifications
- 9 kHz to 26.5 GHz, ESA-L Basic Analyzer
- Sweep Time (
E4408B Options – click to expand
E4408B Options
- 042 Gray spectrum analyzer backpack
- 044 Yellow spectrum analyzer backpack
- 049 Color Display Upgrade
- 0B0 Do not include manuals
- 0B1 Add Manual Set
- 0BV Service Documentation, Component Level
- 0BW Service Documentation, Assembly Level
- 1A7 ESA Series ISO 17025 compliant calibration with test data
- 1AX RS-232 and Centronics interface
- 1CP Rackmount and handle kit
- 1D5 High stability frequency reference
- 1D7 50 -75 ohm minimum loss pad(s)
- 1DN 50 Ohm Tracking generator
- 1DP 75 Ohm input impedance
- 1DR Narrow Resolution Bandwidths
- 230 BenchLink web remote control software
- 290 859x programming code compatibilty
- 521 No color display
- A4H GPIB and Centronics interface
- A4J IF and sweep ports
- A5D 12 Vdc power cable
- A6J ESA Series ANSI Z540 compliant calibration with test data
- AB0 Taiwan Quick Users Guide (Chinese localization)
- AB1 Korea Quick Users Guide (Korean localization)
- AB2 China Quick Users Guide (Chinese localization)
- ABD Germany Quick Users Guide (German localization)
- ABE Spain Quick Users Guide (Spanish localization)
- ABF France Quick Users Guide (French localization)
- ABJ Japan Quick Users Guide (Japanese localization)
- ABZ Italy Quick Users Guide (Italian localization)
- AKT Russia - Russian localization (includes English manual set)
- AXT Add transit case
- AYT Gray soft carrying/operating case
- AYU Yellow soft carrying/operating case
- B70 BenchLink spectrum analyzer S/W
- B72 Increase memory to 16MB
- BAB APC 3.5 Input Connector
- BAS Basic analyzer (A4J)
- BTG Basic analyzer with tracking generator (1DN, A4J)
- R-50C-011-3 Agilent Calibration - 3 years
- R-50C-011-5 Agilent Calibration - 5 years
- R-50C-016-3 ISO 17025 Compliant Calibration - 3 years
- R-50C-016-5 ISO 17025 Compliant Calibration - 5 years
- R-50C-021-3 ANSI Z540-1-1994 Calibration - 3 years
- R-50C-021-5 ANSI Z540-1-1994 Calibration - 5 years
- R-51B-001-3C Return to Agilent Warranty - 3 years
- R-51B-001-5C Return to Agilent Warranty - 5 years
- R-51B-001-C Return to Agilent Warranty - 1 year
- RMKT Agilent Refurbished Product (Do Not Use - Certiprime Option)
- UK6 Commercial cal. Certificate w/test data
- UK9 Front panel cover
Agilent / HP E4408B Error Codes – click to expand
Agilent E4408B Error Codes and Messages
Error and status messages for the Agilent E4408B ESA-L spectrum analyzer. Numbered errors appear in the error queue (System, Show Errors); status messages appear in the upper-right of the display. Hardware-related messages are listed first.
E4408B notes
- The E4408B is an ESA-L analyzer to 26.5 GHz. This list uses the ESA numbering (108 is Cal Oscillator Unlock, 600-series file errors use ESA numbers).
- Align Now, All on the E4408B needs the AMPTD REF OUT cabled to the INPUT (error 652 if it is missing).
- Above 3 GHz the E4408B uses an A8A6 RYTHM (YIG-tuned harmonic mixer) with the A8A4 LOIS and A7A4 Frequency Extension board; preselector messages 208/209 apply there.
- As an L-series model the E4408B uses the L-series motherboard and does not take the E-series options (fast ADC, FM demod, digital demod, precision frequency reference).
E4408B hardware and alignment errors
| Error | Message | Meaning |
|---|---|---|
| 64 | Align All Now Needed | The stored alignment data is no longer valid. Run System, Alignments, Align Now, All. If the message comes straight back, or the alignment itself fails, there is a hardware fault in the signal path being aligned. |
| 102 | Excessive 50 MHz RF input power is preventing internal alignments | Too much 50 MHz energy is at the RF input for the internal alignment to run. Bring the input below 0 dBm and align again. |
| 103 | Sampling Oscillator Unlock | The sampling oscillator that helps lock the first LO has lost lock. This is a hardware fault: on the E4408B the LO circuits are part of the A8 RF assembly (A8A1A2 RF Front End/LO bottom board with the YIG oscillator, and A8A1A1 Reference/Third Converter top board). |
| 104 | 1st LO Unlock | The first LO cannot hold phase lock. Usually hardware: on the E4408B the first LO is the YIG oscillator on the A8A1A2 RF Front End/LO board, locked to the A8A1A1 reference. |
| 105 | 2nd LO Unlock | The second LO has lost phase lock. On the E4408B check the A8A2 Second Converter and its 600 MHz drive (cable W10). |
| 106 | 4th LO Unlock | The fourth LO in the IF chain has lost phase lock. On the E4408B suspect the A3 IF assembly. |
| 107 | Sample Clock Unlock | The ADC sample clock has lost lock. On the E4408B suspect the A3 IF assembly or its reference input. |
| 108 | Cal Oscillator Unlock | The internal calibration oscillator has lost lock, so alignments and amplitude accuracy are affected. On the E4408B the calibrator is part of the A8 RF assembly (A8A1A2 RF Front End/LO bottom board with the YIG oscillator, and A8A1A1 Reference/Third Converter top board). |
| 143 | Final IF Overload | The final IF stage is overdriven. Add input attenuation or lower the signal. If it shows with no signal connected, suspect the IF section. |
| 197 | Marker Freq Count HW Failure | The marker counter hardware did not return a valid count. A persistent failure points to the IF/counter circuitry. |
| 206 | Unable to initialize flatness data | Flatness correction data in the internal EEROM could not be set up. Amplitude flatness will be wrong until the data is restored; this needs service. |
| 207 | Unable to store flatness data | Writing flatness correction data to the internal EEROM failed. Usually means a memory problem or a failed adjustment; needs service. |
| 622 | External reference missing or out of range | External reference is selected but the signal at EXT REF IN is missing, too low, or not at the frequency entered. If it appears on internal reference, suspect the reference circuitry. |
| 651 | Connect RF OUT to INPUT | A tracking generator alignment was started without the TG RF OUT cabled to the analyzer INPUT. Connect it and repeat. |
| 652 | Connect Amptd Ref Output to Input | The alignment needs the front-panel AMPTD REF OUT cabled to the INPUT on this model. |
| 653 | Auto Align not available when using Calibration Defaults | Calibration defaults are loaded, so auto alignment is off until Align Now, All has been run successfully. |
| 767 | Failed to Initialize ISTATE regions. Fatal LDS error | The instrument state memory could not be initialized at power-up. Cycle power; if it repeats, the processor or its memory needs service. |
E4408B status messages
| Status message | Meaning |
|---|---|
| 50 MHz Osc Unlevel | The internal 50 MHz amplitude reference is unleveled. Alignments cannot run correctly until this is fixed; points to the calibrator/reference circuitry. |
| First IF Overload | The first IF is overdriven. Increase attenuation or reduce the input; with no input applied it indicates an RF/IF fault. |
| Frequency Reference Error (Freq Ref Unlocked) | The frequency reference loop is unlocked or near unlock. On external reference, check the source matches the entered value; on internal reference it is a reference-board fault. |
| LO Unlock (Synth Unlocked) | The LO phase-lock circuitry is unlocked. Readings are invalid until it is repaired. |
| LO Unlevel (LO Unleveled) | The LO drive is unleveled inside the instrument, causing low or unstable signal levels. |
| ADC / IF / LO / RF Align Failure | Status bits that are set when a particular alignment routine fails. The failing routine identifies the section to troubleshoot. |
| Source LO Unlock / Source Unlevel | Tracking generator LO lost lock, or TG output cannot hold the set level. Check frequency and power are inside TG limits first; otherwise a TG board fault. |
E4408B setup messages
| Error | Message | Meaning |
|---|---|---|
| 129 | Meas Uncal | Sweep is too fast for the RBW/VBW. Increase sweep time or press Auto Couple. |
| 163 | Freq Count: Reduce Span/RBW ratio | Span is too wide for the RBW to count a marker. Narrow the span or widen the RBW. |
| 201 | Option not installed | The function needs an option this unit does not have. |
| 202 | No peak found | No signal met the peak search criteria. |
| 204 | TG Frequency Limit | The tracking generator has reached the end of its frequency range. |
| 208 | Preselector is not available at this frequency | Preselector centering only works above about 3 GHz. |
| 209 | Preselector centering failed | Centering was attempted with too wide a span or no usable signal. |
| 211 | RBW limited to 1 kHz when Span > 5 MHz | Digital RBWs under 1 kHz are only available in narrower spans. |
| 214 | TG start freq is less than 9 kHz | Tracking generator is uncalibrated below 9 kHz. |
| 224 | Option not licensed | The option is present but has no license key installed. |
| 751 | Instrument state set to initial values | A saved or power-on state was corrupt and defaults were loaded. |
| 757 | Unable to load user state, factory preset was done | The user preset is invalid; save a good state as the user preset. |
| 769 | Invalid instrument mode | The requested measurement personality is not installed. |
E4408B file and storage errors
| Error | Message |
|---|---|
| 604 | File exists |
| 605 | Media is protected |
| 607 | File name error |
| 609 | Media is not writable |
| 612 | File not found |
| 613 | Flash memory is full |
| 614 | Bad, missing, or unformatted disk |
| 615 | File is corrupt |
| 617 | Wrong density floppy inserted |
E4408B SCPI error ranges
| Range | Class |
|---|---|
| −100 to −199 | Command errors (syntax, header) |
| −200 to −299 | Execution errors (setting out of range, not allowed now) |
| −300 to −399 | Device-specific errors (queue overflow, self-test, memory) |
| −400 to −499 | Query errors (unterminated or interrupted query) |
LO unlock, alignment failure or IF overload on your E4408B? Analyzer Repair Inc. repairs and calibrates the Agilent E4408B in-house in Cocoa, Florida, including YTO, RF assembly, synthesizer and IF board faults. Free estimate once the unit is in our lab. Contact us for service.
Message numbers from Agilent ESA/PSA Instrument Messages and Functional Tests (E4440-90619); assembly references from the Agilent ESA Spectrum Analyzers Service Guide.
Agilent / HP E4408B Replaceable Parts – click to expand
Agilent E4408B Replaceable Assemblies and Part Numbers
Major replaceable assemblies for the Agilent E4408B with Agilent part numbers from the Agilent ESA Spectrum Analyzers Service Guide. Option-only parts are marked in the Notes column.
| Reference | Assembly | Agilent part number | Notes |
|---|---|---|---|
| A1A1 | Front panel interface board kit | E4401-60241 | |
| A1A1A1 | Rotary pulse generator (RPG) | 1990-1865 | |
| A1A2 | LCD assembly kit | E4401-60242 | Serial prefix US4119 and above (earlier units take E4401-60241 and E4401-60242) |
| A1A2DS1/DS2 | Display backlight | 2090-0577 | Upper and lower |
| A1A3 | Front frame assembly | E4401-60257 | Except Option 060 |
| A1MP5 | Main keypad | E4401-40002 | |
| A2A1 | 3.0 GHz TG driver board with shields | E4403-60043 | Option 1DN (exchange E4403-69043) |
| A2A2 | 3.0 GHz BITG microcircuit | 5086-7993 | Option 1DN (exchange 5086-6993) |
| A2A3 | 3.0 GHz TG output attenuator | 0955-0679 | Option 1DN |
| A3 | IF assembly with shields | E4401-60183 | |
| A4 | Processor assembly, enhanced memory | E4401-60233 | Option B72 |
| A4A1 | Flash SIMM, 4 MB | E4401-60105 | 12 MB E4401-60081 with Option B72 |
| A4A2 | DRAM SIMM, 32 MB | E4401-60289 | Option B72 |
| A4MAU58 | Lithium battery, 3 V | 1420-0556 | |
| A5 | Power supply assembly | E4401-60186 | |
| A5B1 | Fan | 3160-0866 | |
| A6 | Speaker/floppy assembly | E4401-60008 | |
| A7 | Motherboard, ESA-L series | E4411-60013 | |
| A7A1 | IF/video/sweep ports | E4401-60096 | Option A4J |
| A7A2 | GPIB assembly | E4401-60013 | Option A4H |
| A7A3 | RS-232 assembly | E4401-60014 | Option 1AX |
| A7A4 | Frequency extension assembly | E4404-60001 | |
| A7A9 | ACPR dynamic range extension | E4403-60065 | Option 120 |
| A7A10 | Bluetooth FM demodulator | E4403-60223 | |
| A7A12 | IF out assembly | E4403-60076 | Option H55 |
| A7A12 | IF out assembly | E4404-60034 | Option H70 |
| A8 | 3 GHz RF complete assembly | E4403-60073 | Without precision reference (exchange E4403-69073) |
| A8A1A1 | Reference/third converter (top board) | E4403-60001 | Without precision reference |
| A8A1A2 | 3 GHz RF front end/LO (bottom board) | E4403-60033 | |
| A8A1A2MC1 | YIG oscillator | 0955-1039 | |
| A8A2 | Second converter | 5086-7958 | |
| A8A3 | DC block | E4403-60026 | Except Option UKB |
| A8A4 | LO amplifier/IF switch (LOIS) | E4404-60030 | Exchange E4404-69030 |
| A8A5 | Input attenuator, 26.5 GHz | 33321-60057 | Except Option UKB (UKB: 33321-60061) |
| A8A6 | YIG-tuned harmonic mixer (RYTHM), 26.5 GHz | 5087-7031 | Exchange 5087-6031 |
| A8FL1 | Low pass filter, 3.1 GHz | 0955-0988 | |
| A8J1 | RF input Type-N connector kit | E4403-60015 | Except Option 060 |
| A8J1 | RF input APC-3.5 connector kit | E4407-60002 | Option BAB |
Part obsolete? Many E4408B assemblies are no longer sold new. Analyzer Repair Inc. repairs E4408B RF assemblies, YTOs, IF and synthesizer boards at the component level in Cocoa, Florida. Free estimate once the unit is in our lab. Contact us for service.
From the Agilent ESA Spectrum Analyzers Service Guide.
Located in: Spectrum Analyzers