Model SR715 Model SR720 LCR Meters

TROUBLESHOOTINGError MessagesThe following lists explain all of the error messages that the SR715/720 cangenerate. The messages are divided into operational errors (errors in using theinstrument), self-test errors, and calibration errors. The messages are listedalphabetically.Operational ErrorsMessageBias For CConv ErrorFloat ErrorF-R ErrorOver LoadOver RangeRange ErrorRcl ErrorSyn ErrorThese error messages may appear during normal front panel operation andgenerally are warnings for incorrect operation.MeaningThe SR715/720's DC bias function may only be used for capacitancemeasurements. Set the parameter mode to either C+D or C+R to use DC bias.An A/D conversion that is either too short or too long can produce this error.Continued errors may indicate a hardware problem.An error in a floating point math routine occurred.Frequency-Range incompatibility. The 100 kΩ range may not be used with the100 kHz drive frequency.The SR715/720's input is overloaded. This can happen transiently as parts arechanged or if a part with too small an impedance is measured on the constantdrive voltage setting.The impedance is beyond the SR715/720's measurement ability on the currentrange. If range hold is active change to a higher range.Parameter in command is out of allowed range for that command.Non-volatile RAM has been corrupted. User calibrations and settings may be lost.If this error occurs frequently, check the battery.The command syntax is invalid. See the PROGRAMMING section for correctcommand syntax.Self-test ErrorsThese errors may occur during the SR715/720's self-test. In general, thesemessages indicate SR715/720 hardware problems. If the errors occur repeatedlythe unit may have an electrical problem. The messages are listed alphabetically,also listed is the status value returned by the *TST? command.Message Status MeaningAD Error 6 The A/D converter failed its test. The test measures 0 V and ±2 Vdc.Bias Error 7 The SR715/720's internal DC bias source failed its test.Cal Error 4 The RAM calibration data has become corrupt. The factory values will bereloaded from ROM. This message is not a problem unless it occursfrequently, which could indicate a problem with the battery backupcircuits.6-2