Custom-Cal has a high success rate in repairing Agilent 8719ET, 8720ET, and 8722ET Network Analyzers. We specialize in quick turnaround times and we can handle expedited deliveries upon request.
The Agilent 8719ET, 8720ET, and 8722ET Network Analyzers feature a built-in transmission/ reflection test set for a full range of magnitude and phase measurements in the forward direction. Built-in vector accuracy enhancement techniques include one-port, response, and enhanced response calibrations. Enhanced response calibration improves the accuracy of transmission measurements by correcting for source match effects, which a regular response calibration cannot do. The optional 55-dB step attenuator provides a wider range of output power levels for testing active devices.

Errors and Options for Network Analyzer.
  Error Messages:
68 ADDITIONAL STANDARDS NEEDED
  Error correction for the selected calibration class cannot be computed until you have measured all the necessary standards.
31 ADDRESSED TO TALK WITH NOTHING TO SAY
  You have sent a read command to the analyzer (such as ENTER 716) without first requesting data with an appropriate output command (such as OUTPDATA). The analyzer has no data in the output queue to satisfy the request.
212 ANALOG BUS DISABLED IN 6KHZ IF BW
  When you press AVG IF BW[6000] , the analog bus is disabled and not available for use in troubleshooting.
60 ANALOG INPUT OVERLOAD
  The power level of the analog input is too high. Reduce the power level of the analog input source.
183 BATTERY FAILED. STATE MEMORY CLEARED
  The battery protection of the non-volatile CMOS memory has failed. The CMOS memory has been cleared.
184 BATTERY LOW! STORE SAVE REGS TO DISK
  The battery protection of the non-volatile CMOS memory is in danger of failing. If this occurs, all of the instrument state registers stored in CMOS memory will be lost.
34 BLOCK INPUT ERROR
  The analyzer did not receive a complete data transmission. This is usually caused by an interruption of the bus transaction. Clear by pressing the “Local” key or aborting the I/O process at the controller.
35 BLOCK INPUT LENGTH ERROR
  The length of the header received by the analyzer did not agree with the size of the internal array block. Refer to the analyzer’s programmers guide for instructions on using analyzer input commands.
74 CALIBRATION ABORTED
  You have changed the active channel during a calibration so the calibration in progress was terminated. Make sure the appropriate channel is active and restart the calibration.
63 CALIBRATION REQUIRED
  A calibration set could not be found that matched the current stimulus state or measurement parameter. You will have to perform a new calibration.
203 CANNOT READ/WRITE 1 FILE SYSTEM
  The disk is being accessed by the analyzer and is found to contain an 1 (hierarchical file system) or files nested within subdirectories. The analyzer does not support 1. Replace the disk medium with a LIF or DOS formatted disk that does not contain files nested within subdirectories.
179 CAUTION: POWER OUT MAY BE UNLEVELED
  There is either a hardware failure in the source or you have attempted to set the power level too high. The analyzer allows the output power to be set higher or lower than the specified available power range. However, these output powers may be un-leveled or unavailable.
3 CORRECTION CONSTANTS NOT STORED
  A store operation to the EEPROM was not successful. You must change the position of the jumper on the A7 CPU assembly.
66 CORRECTION TURNED OFF
  Critical parameters in your current instrument state do not match the parameters for the calibration set, therefore correction has been turned off. The critical instrument state parameters are sweep type, start frequency, frequency span, and number of points.
64 CURRENT PARAMETER NOT IN CAL SET
  Correction is not valid for your selected measurement parameter. Either change the measurement parameters or perform a new calibration.
11 DEADLOCK
  A fatal firmware error occurred before instrument preset completed. Call for service.
119 DEVICE: not on, not connect, wrong addrs
  The device at the selected address cannot be accessed by the analyzer. Verify that the device is switched on, and check the GPIB connection between the analyzer and the device. Ensure that the device address recognized by the analyzer matches the GPIB address set on the device itself.
39 DISK HARDWARE PROBLEM
  The disk drive is not responding correctly. If using an external disk drive, refer to the disk drive operating manual.
190 DISK MESSAGE LENGTH ERROR
  The analyzer and the external disk drive aren’t communicating properly. Check the GPIB connection and then try substituting another disk drive to isolate the problem instrument.
38 DISK: not on, not connected, wrong addrs
  The disk cannot be accessed by the analyzer. Verify power to the disk drive, and check the GPIB connection between the analyzer and the disk drive. Ensure that the disk drive address recognized by the analyzer matches the GPIB address set on the disk drive itself.
189 DISK READ/WRITE ERROR
  There may be a problem with your disk. Try a new floppy disk. If a new floppy disk does not eliminate the error, suspect hardware problems.
  FILE NOT COMPATIBLE WITH INSTRUMENT
  You cannot recall user graphics that had been saved on an earlier model of analyzer with a monochrome display.
46 ILLEGAL UNIT OR VOLUME NUMBER
  The disk unit or volume number set in the analyzer is not valid. Refer to the disk drive operating manual.
47 INITIALIZATION FAILED
  The disk initialization failed, probably because the disk is damaged.
154 INSUFFICIENT MEMORY, PWR MTR CAL OFF
  There is not enough memory space for the power meter calibration array. Increase the available memory by clearing one or more save/recall registers, or by reducing the number of points.
69 NO CALIBRATION CURRENTLY IN PROGRESS
  The softkey “RESUME CAL SEQUENCE” is not valid unless a calibration is already in progress. Start a new calibration.
114 NO FAIL FOUND
  Service Error, the self-diagnose function of the instrument operates on an internal test failure. At this time, no failure has been detected.
45 NO FILE(S) FOUND ON DISK
  No files of the type created by an analyzer store operation were found on the disk. If you requested a specific file title, that file was not found on the disk.
5 NO IF FOUND: CHECK R INPUT LEVEL
  The first IF signal was not detected during pretune. Check the front panel R channel jumper.
70 NO SPACE FOR NEW CAL.CLEAR REGISTERS
  You cannot store a calibration set due to insufficient memory. You can free more memory by clearing a saved instrument state from an internal register (which may also delete an associated calibration set, if all the instrument states using the calibration kit have been deleted). You can store the saved instrument state and calibration set to a disk before clearing them. After deleting the instrument states, press “Preset” to run the memory packer.
198 NOT ALLOWED DURING POWER METER CAL
  When the analyzer is performing a power meter calibration, the GPIB bus is unavailable for other functions such as printing or plotting.
44 NOT ENOUGH SPACE ON DISK FOR STORE
  The store operation will overflow the available disk space. Insert a new disk or purge files to create free disk space.
58 OVERLOAD ON INPUT A, POWER REDUCED
  You have exceeded approximately +14 dBm at one of the test ports. The RF output power is automatically reduced to -85 dBm. The annotation Pß appears in the left margin of the display to indicate that the power trip function has been activated. When this occurs, reset the power to a lower level, then toggle the “SOURCE PWR on OFF” softkey to switch on the power again.
59 OVERLOAD ON INPUT B, POWER REDUCED
  You have exceeded approximately +14 dBm at one of the test ports. The RF output power is automatically reduced to -85 dBm. The annotation Pß appears in the left margin of the display to indicate that the power trip function has been activated. When this occurs, reset the power to a lower level, then toggle the “SOURCE PWR on OFF” softkey to switch on the power again.
167 PARALLEL PORT NOT AVAILABLE FOR COPY
  You have defined the parallel port as general purpose I/O (GPIO) for sequencing. The definition was made under the “Local” key menus. To access the parallel port for copy, set the selection to “PARALLEL [COPY]”.
165 PARALLEL PORT NOT AVAILABLE FOR GPIO
  You have defined the parallel port as COPY for sequencing in the GPIB menu. To access the parallel port for general purpose I/O (GPIO), set the selection to “PARALLEL [GPIO]”.
4 PHASE LOCK CAL FAILED
  An internal phase lock calibration routine is automatically executed at power-on, preset, and any time a loss of phase lock is detected. This message indicates that phase lock calibration was initiated and the first IF detected, but a problem prevented the calibration from completing successfully. This message may appear if you connect a mixer between the RF output and R input before turning on frequency offset mode. Ignore it: it will go away when you turn on frequency offset. This message may also appear if you turn on frequency offset mode before you define the offset.
7 PHASE LOCK FAILURE
  The first IF signal was detected at pretune, but phase lock could not be acquired.
8 PHASE LOCK LOST
  Phase lock was acquired but then lost.
6 POSSIBLE FALSE LOCK
  Phase lock has been achieved, but the source may be phase locked to the wrong harmonic of the synthesizer.
116 POWER METER INVALID
  The power meter indicates an out-of-range condition. Check the test setup.
118 POWER METER NOT SETTLED
  Sequential power meter readings are not consistent. Verify that the equipment is set up correctly. If so, preset the instrument and restart the operation.
21 POWER SUPPLY HOT!
  The temperature sensors on the A8 post-regulator assembly have detected an over-temperature condition. The power supplies regulated on the post-regulator have been shut down.
22 POWER SUPPLY SHUT DOWN!
  One or more supplies on the A8 post-regulator assembly have been shut down due to an over-current, over-voltage, or under-voltage condition.
175 PRINTER: error
  The parallel port printer is malfunctioning. The analyzer cannot complete the copy function.
177 PRINTER: not handshaking
  The printer at the parallel port is not responding.
24 PRINTER: not on, not connected, wrong addrs
  The printer does not respond to control. Verify power to the printer, and check the GPIB connection between the analyzer and the printer. Ensure that the printer address recognized by the analyzer matches the GPIB address set on the printer itself.
117 PWR MTR: NOT ON/CONNECTED OR WRONG ADDR
  The power meter cannot be accessed by the analyzer. Verify that the power meter address and model number set in the analyzer match the address and model number of the actual power meter.
151 SAVE FAILED.INSUFFICIENT MEMORY
  You cannot store an instrument state in an internal register due to insufficient memory. Increase the available memory by clearing one or more save/recall registers and pressing “Preset”, or by storing files to a disk.
112 SELF TEST #n FAILED
  Internal test #n has failed. Several internal test routines are executed at instrument preset. The analyzer reports the first failure detected. Refer to the internal tests and the self-diagnose feature descriptions earlier in this chapter.
  SOURCE POWER TURNED OFF, RESET UNDER POWER MENU
  You have exceeded the maximum power level at one of the inputs and power has been automatically reduced. The annotation Pß indicates that power trip has been activated. When this occurs, reset the power and then press “Power” “SOURCE PWR on OFF” to switch on the power. This message follows error numbers 57, 58, and 59.
187 SWEEP MODE CHANGED TO CW TIME SWEEP
  If you select external source auto or manual instrument mode and you do not also select CW mode, the analyzer is automatically switched to CW.
12 SWEEP TIME TOO FAST
  The fractional-N and digital IF circuits have lost synchronization.
113 TEST ABORTED
  You have prematurely stopped a service test.
57 TEST PORT OVERLOAD, REDUCE POWER
  You have exceeded approximately +14 dBm at one of the test ports (or 0 dBm at the A or B sampler, Option 012 only). When this occurs, reduce the power to a lower level.
115 TROUBLE!CHECK SET-UP AND START OVER
  Service Error, your equipment setup for the adjustment procedure in progress is not correct.
77 WRONG DISK FORMAT, INITIALIZE DISK
  You have attempted to store, load, or read file titles, but your disk format does not conform to the Logical Interchange Format (LIF) or DOS format. You must initialize the disk before reading or writing to it.

Instrument Options:
004 Step Attenuator: adds a 55-dB step attenuator to increase the source output power range.
010 Time-domain capability: allows time-domain measurements.
1D5 High-stability frequency reference: replaces standard frequency reference with a higher stability unit.
Description of Model 
Transmission/Reflection Vector Network Analyzer
 
Frequency
• Frequency Range: 50 MHz to 13.5 Ghz
• Frequency Resolution: 1 Hz
• Frequency Accuracy (25 C): ±10 ppm
System
• Maximum input level: +5 dBm transmission, +10 dBm reflection
• Damage level (test port): 27 dBm or 0V dc
• Trace noise Magnitude (RMS of peak-to-peak value):
0.05 to 13.5 GHz < 0.03 dB
• Harmonics at maximum output level <–15 dBc
Power
• Power range: 20 dB
• Maximum output power: +10 dBm
• Resolution Level accuracy (at 5 dB below maximum output power) ±2 dB
• Power sweep range: 20 dB
• Power linearity –5 dB from reference: ±0.35
• Power linearity +5 dB from reference: ±0.35
• Power linearity –10 dB from reference: ±0.60

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