TROUBLESHOOTING
6-2
Error Messages The following lists explain all of the error messages that the SR715/720 can
generate. The messages are divided into operational errors (errors in using the
instrument), self-test errors, and calibration errors. The messages are listed
alphabetically.
Operational Errors These error messages may appear during normal front panel operation and
generally are warnings for incorrect operation.
Message Meaning
Bias For C The SR715/720's DC bias function may only be used for capacitance
measurements. Set the parameter mode to either C+D or C+R to use DC bias.
Conv Error An A/D conversion that is either too short or too long can produce this error.
Continued errors may indicate a hardware problem.
Float Error An error in a floating point math routine occurred.
F-R Error Frequency-Range incompatibility. The 100 kΩ range may not be used with the
100 kHz drive frequency.
Over Load The SR715/720's input is overloaded. This can happen transiently as parts are
changed or if a part with too small an impedance is measured on the constant
drive voltage setting.
Over Range The impedance is beyond the SR715/720's measurement ability on the current
range. If range hold is active change to a higher range.
Range Error Parameter in command is out of allowed range for that command.
Rcl Error Non-volatile RAM has been corrupted. User calibrations and settings may be lost.
If this error occurs frequently, check the battery.
Syn Error The command syntax is invalid. See the PROGRAMMING section for correct
command syntax.
Self-test Errors These errors may occur during the SR715/720's self-test. In general, these
messages indicate SR715/720 hardware problems. If the errors occur repeatedly
the unit may have an electrical problem. The messages are listed alphabetically,
also listed is the status value returned by the *TST? command.
Message Status
Meaning
AD 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 be
reloaded from ROM. This message is not a problem unless it occurs
frequently, which could indicate a problem with the battery backup
circuits.
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