Keysight (Agilent HP) 8720ES Repair Service
Product model
8720ES S-parameter Network AnalyzerServices
Send us your Agilent HP 8720ES Network Analyzer for full repair and calibration. Our veteran-owned lab offers free estimates and quick turnaround.
Description
HP 8720ES Network Analyzer features a 50 MHz to 20 GHz frequency range and provides users with a tool for complete analysis of RF as well as microwave equipment.
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.
8720ES Specifications – click to expand
8720ES Specifications
| Specification | Value |
|---|---|
| Frequency Accuracy (at 23° C ±3° C) | ±10 ppm |
| Frequency Stability 0° to 55° C | ±7.5 ppm, Option 1D5 ±0.05 ppm |
| Frequency Resolution | 1 Hz |
| System Maximum input level | 10 dBm |
| System Trace noise, Magnitude (RMS of peak-to-peak value) | 0.05 to 13.5 GHz |
8720ES Options – click to expand
8720ES Options
System Dynamic range (standard, Options 085, 400): 0.05 to 0.84 GHz, 77 dB; 0.84 to 20 GHz, 100 dB. Measured number of points per sweep: Linear frequency: choose 3, 11, 21, 51, 101, 201, 401, 801, or 1601 points. GPIB interface
HP / Agilent 8720ES Error Messages – click to expand
HP / Agilent 8720ES Error Messages
The Agilent 8720ES (50 MHz to 20 GHz) reports faults as text messages with an error number. Hardware (H) messages point to a failed assembly; user (U) messages mean a setup, calibration or cable issue; (M) messages are information.
8720ES notes
- The 8720ES has a full S-parameter test set with a transfer switch, bias tees and step attenuator.
- Phase lock messages on the 8720ES first check the R channel: it needs at least −35 dBm with the front-panel R CHANNEL jumper in place.
- Phase lock errors on the 8720ES usually point to the source (YIG oscillator or source assembly) or the phase lock board, but check R channel input level first.
8720ES hardware error messages
| Message | Error no. | Type | Meaning |
|---|---|---|---|
| PHASE LOCK FAILURE | 7 | H | The analyzer could not acquire phase lock. Check R channel level, then the source and phase lock circuits. |
| PHASE LOCK LOST | 8 | H | Phase lock was acquired and then dropped during the sweep. |
| PHASE LOCK CAL FAILED | 4 | H | The automatic phase lock calibration (run at power-on or when pretune drifts) failed. |
| POSSIBLE FALSE LOCK | 6 | H | The source may be locked to the wrong harmonic comb tooth, so frequencies can be wrong. |
| SWEEP TIME TOO FAST | 12 | H | The fractional-N and digital IF circuits lost synchronization; points to the digital control section. |
| CAUTION: POWER OUT MAY BE UNLEVELED | 179 | H | Source output may not be leveled. Can be a power setting beyond the source range or a source/ALC fault. |
| POWER SUPPLY HOT! | 21 | H | The power supply is overheating. Check the fan, filter and air flow. |
| POWER SUPPLY SHUT DOWN! | 22 | H | One or more supplies shut down, usually from an overload or short on a board. |
| BATTERY FAILED. STATE MEMORY CLEARED | 183 | H | The memory backup battery has failed and stored instrument states were cleared. Replace the battery on the CPU board. |
| BATTERY LOW! STORE SAVE REGS TO DISK | 184 | H | The memory backup battery is getting weak. Save your states to disk and replace the battery. |
| CORRECTION CONSTANTS NOT STORED | 3 | H | Writing correction constants to EEPROM failed. The A9 CPU write-protect switch/jumper must be set to allow writing. |
| DEADLOCK | 111 | H | An internal firmware deadlock occurred. Cycle power; if it repeats, the CPU or a firmware problem is likely. |
| DISK HARDWARE PROBLEM | 39 | H | The disk drive is not responding properly. |
| DISK READ/WRITE ERROR | 189 | H | A disk read or write failed; try another disk, then suspect the drive. |
| DISK MESSAGE LENGTH ERROR | 190 | H | The disk drive and analyzer are out of step during a transfer. |
| INITIALIZATION FAILED | 47 | H | The disk could not be initialized; check the disk and drive. |
| NO IF FOUND: CHECK R INPUT LEVEL | 5 | H | The first IF was not detected while pretuning the phase lock. Usually a source fault, or the R channel is getting too little signal (needs at least −35 dBm). |
8720ES calibration, setup and information messages
| Message | Error no. | Type | Meaning |
|---|---|---|---|
| SOURCE POWER TURNED OFF, RESET UNDER POWER MENU | M | An input overload tripped the source off. Remove the overload and turn power back on in the power menu. | |
| CALIBRATION REQUIRED | 63 | U | No calibration set matches the current stimulus or measurement; perform a new cal. |
| CURRENT PARAMETER NOT IN CAL SET | 64 | U | The parameter you selected was not included in the active calibration. |
| CORRECTION TURNED OFF | 66 | U | Sweep type, start, span or number of points changed from the cal, so correction was switched off. |
| NO CALIBRATION CURRENTLY IN PROGRESS | 69 | U | A cal step was requested but no calibration is running. |
| NO SPACE FOR NEW CAL. CLEAR REGISTERS | 70 | U | Memory is full; clear saved registers to store a new calibration. |
| CALIBRATION ABORTED | 74 | U | The active channel was changed during a cal, so it stopped. Restart on the right channel. |
| POWER METER INVALID | 116 | U | The power meter reading is out of range or not valid. |
| PWR MTR: NOT ON/CONNECTED OR WRONG ADDRS | 117 | U | The power meter is off, not connected by GPIB, or set to the wrong address. |
| POWER METER NOT SETTLED | 118 | U | Power meter readings are not stable. |
| NOT ALLOWED DURING POWER METER CAL | 198 | U | That function cannot be used while a source power meter calibration is running. |
| INSUFFICIENT MEMORY, PWR MTR CAL OFF | 154 | U | Not enough memory for power meter cal data, so it was turned off. |
| SAVE FAILED. INSUFFICIENT MEMORY | 151 | U | Not enough memory to save the state; clear some registers. |
| NOT ENOUGH SPACE ON DISK FOR STORE | 44 | U | The disk is full. |
| NO FILE(S) FOUND ON DISK | 45 | U | No files of the requested type are on the disk. |
| PARALLEL PORT NOT AVAILABLE FOR COPY | 167 | U | The parallel port is set for GPIO, so it cannot be used for printing. |
| PARALLEL PORT NOT AVAILABLE FOR GPIO | 165 | U | The parallel port is set for printing, so it cannot be used as GPIO. |
| SWEEP MODE CHANGED TO CW TIME SWEEP | 187 | M | The sweep mode was switched to CW time sweep. |
| OVERLOAD ON INPUT A, POWER REDUCED | 58 | U | Too much power at input A; the analyzer reduced source power (P⇓ annotation). Lower the power, then reset it in the power menu. |
| OVERLOAD ON INPUT B, POWER REDUCED | 59 | U | Too much power at input B; source power was reduced (P⇓). Lower the power, then reset it in the power menu. |
| TEST PORT OVERLOAD, REDUCE POWER | 57 | U | Too much power at a test port; source power was reduced. Lower the input level. |
| ADDITIONAL STANDARDS NEEDED | 68 | U | Not all calibration standards for this cal type have been measured yet. |
| ANALOG INPUT OVERLOAD | 60 | U | The signal on the analog (AUX) input is too high. |
| ILLEGAL UNIT OR VOLUME NUMBER | 46 | U | The disk unit or volume number is not valid. |
| CANNOT READ/WRITE 1 FILE SYSTEM | 203 | U | The disk uses a file system the analyzer cannot read or write. |
| ADDRESSED TO TALK WITH NOTHING TO SAY | 31 | U | A GPIB read was sent with no data waiting in the output queue. |
| BLOCK INPUT ERROR | 34 | U | The analyzer received bad data during a GPIB block transfer. |
| BLOCK INPUT LENGTH ERROR | 35 | U | A GPIB block transfer had the wrong length. |
| ANALOG BUS DISABLED IN 6KHZ IF BW | 212 | M | With the 6 kHz IF bandwidth selected, the service analog bus is not available. |
Hardware error on your 8720ES? Analyzer Repair Inc. repairs and calibrates the HP / Agilent 8720ES in-house in Cocoa, Florida, including source, phase lock, sampler and test set faults. Free estimate once the unit is in our lab. Contact us for service.
Message list based on the Agilent 8719ET/ES, 8720ET/ES, 8722ET/ES Service Guide (08720-90397), service error messages. Measurement-only messages are in the 8720ES reference guide.
HP / Agilent 8720ES Replaceable Parts – click to expand
HP 8720ES Replaceable Assemblies and Part Numbers
Major replaceable assemblies in the 8720ES, with HP / Agilent part numbers from the Agilent 8719ET/ES, 8720ET/ES, 8722ET/ES Service Guide (08720-90397). Check your option list before ordering option-specific parts.
| Reference | Assembly | HP part number | Notes |
|---|---|---|---|
| A1 | Keyboard board | 08720-60267 | |
| A2 | Front panel interface board | 08720-60260 | |
| A3 | Disk drive replacement kit | 08720-60190 | |
| A4, A5, A6 | Second converter | 08720-60156 | |
| A7 | CPU repair kit | 08720-60253 | Exchange 08720-69253 |
| A8 | Post regulator board | 08722-60099 | Exchange 08722-69099 |
| A9 | Source control board | 08720-60129 | |
| A10 | Digital IF board | 08753-60958 | |
| A11 | Phase lock board | 08720-60181 | |
| A12 | Reference board | 08720-60252 | Exchange 08720-69252 |
| A13 | Frac-N analog board | 08720-60258 | Exchange 08720-69258 |
| A14 | Frac-N digital board | 08720-60179 | Exchange 08720-69179 |
| A15 | Preregulator | 08753-60098 | Exchange 08753-69098 |
| A17 | Motherboard | 08720-60264 | |
| A18 | Color LCD assembly | 2090-0361 | |
| A19 | GSP (graphics) board | 08720-60261 | |
| A20, A29 | Microwave switch | 08415-60057 | |
| A23, A24 | R-channel switches | 5086-7589 | Option 089 |
| A51 | Test set interface board | 08720-60274 | |
| A51 | Test set interface board | 08720-60275 | Option 400 |
| A52 | Pulse generator | 5086-7456 | Exchange 5086-6456 |
| A53 | Low band assembly | 5086-7583 | Exchange 5086-6583 |
| A55 | YIG oscillator, 2.4 to 20 GHz | 5087-7080 | |
| A56 | LED board | 08720-60182 | |
| A57 | Fixed oscillator | 08720-60073 | |
| A58 | M/A/D/S (modulator/amplifier/detector/splitter) | 5087-7119 | Standard |
| A58 | M/A/D/2 | 5086-7974 | Option 400 (exchange 5086-6974) |
| A59 | Source interface board | 08720-60322 | |
| A60, A61 | Bias tee | 5086-7458 | Exchange 5086-6458 |
| A64, A65, A66 | Sampler | 5086-7614 | Exchange 5086-6614 |
| A68 | Attenuator, 6 dB | 0955-0462 | |
| A69 | Step attenuator, 0 to 55 dB | 33321-60050 | |
| A74 | Transfer switch | 5086-7642 | Standard (exchange 5086-6642) |
| A74 | Transfer switch | 08720-60006 | Option 007 |
| A74 | Switch splitter | 5086-7975 | Option 400 |
| A98 | Frequency converter | 08720-60121 | Exchange 08720-69121 |
| A99 | Frequency converter | 08720-60124 | Option 400 |
Part obsolete? Many 8720ES assemblies are no longer sold new. Analyzer Repair Inc. repairs 8720ES boards, samplers and RF modules at the component level in Cocoa, Florida. Free estimate once the unit is in our lab. Contact us for service.
From the Agilent 8719ET/ES, 8720ET/ES, 8722ET/ES Service Guide (08720-90397).
Located in: Network Analyzers