| Error Code | Error String | Details about error |
| -100 | Command error | A command error indicates that the instrument's GPIB parser has detected an IEEE 488.2 syntax error. Also generated when sending a query to a command or a command to a query. |
| -102 | Syntax error | Syntax - Indicates that an unrecognized command or data type was encountered. For example, a string was received when the device does not accept strings |
| -108 | Parameter not allowed | Indicates that more parameters were received than expected for the header. For example, *ESE common command only accepts one parameter, so *ESE 0,1 is not allowed. |
| -109 | Missing parameter | Indicates that less parameters were received than required for the header. For example, *ESE requires one parameter, *ESE is not allowed. |
| -151 | Invalid string data | Indicates that a string data element was expected, but was invalid, see IEEE 488.2, 7.7.5.2. For example, an END message was received before the terminal quote character. |
| -221 | Settings conflict | Indicates that a legal program data element was parsed but could not be executed due to the current device state. |
| -222 | Data out of range | Indicates that a legal program data element was parsed but could not be executed because the interpreted value was outside the legal range defined by the devices |
| -224 | Illegal parameter value | Indicates that the value selected was not part of the list of values given. |
| -232 | Invalid format | Firmware download data is not formatted correctly. |
| -240 | Hardware error | Indicates that a legal program command or query could not be executed because of a hardware problem in the device. |
| -250 | Mass storage error | Indicates that a flash storage error occurred. |
| -253 | Corrupt media | Indicates that a legal program command or query could not be executed because of corrupt media. For example, bad disk or wrong format. |
| -350 | Queue overflow | Error queue is full (too many errors). |
| -1093 | Device type (9200, 9300) not valid for this command | A 9300-specific command was sent to a 9200 (or vice-versa). |
| -1094 | Error reading data from an auxiliary unit | A timeout occurred when trying to communicate to an auxiliary unit. |
| -1097 | Timeout | Error writing flash memory; Dual-port memory always busy; Measurement aperture never completed. |
| -1099 | NHR generic error | Unable to reset; Invalid download mode; Invalid diagnostic mode; Invalid instrument select. |
| -1196 | Internal query error | Error getting response from DSP. |
| -1197 | Internal command error | Error sending command to DSP. |
| -1198 | Dual port memory error | Dual-port memory always busy. |
| -1282 | Regulation error detected | Internal error regulating current. |
| -1284 | Interlock was/is open, Output is off | Interlock is open. |
| -1285 | Enable Switch was/is open, Output is off | The front panel Enable switch is set to Disabled. |
| -1286 | Voltage Sense Leads error, Output is off | The voltage differential between the output and sense leads is too great. |
| -1287 | Battery under-voltage, Charge is disabled | The sensed voltage is less than the Battery Detect Voltage setting. |
| -1288 | A hardware reset occurred, Output is off | The DSP detected a hardware reset. |
| -1290 | Operating asynchronously in parallel | Auxiliary devices not ready before command synchronization timeout. |
| -1291 | The number of queued macro commands is too large | The number of macro steps has been exceeded. |
| -1292 | Set parameter is out of range | One or more command parameters is out of range. |
| -1293 | Mode prerequisite is not met | The instrument is not setup correctly in order to enable the desired mode. |
| -1294 | Command not recognized | NetBurner sent illegal command to DSP. |
| -1295 | Calibration data checksum error | Either the checksum calculation is bad (flash corruption or erasure) or one of the calibration factors contains a value that is considered out of range. |
| -1296 | FLASH type not detected | DSP could not detect FLASH memory. |
| -1297 | FLASH firmware checksum error | DSP firmware checksum error. |
| -1298 | Executing firmware from PROM | Indicates the DSP is running from PROM instead of FLASH memory. |
| -1335 | PCA A1 Error | Internal hardware error. |
| -1336 | PCA A2 Error | Internal hardware error. |
| -1337 | PCA B1 Error | Internal hardware error. |
| -1338 | PCA B2 Error | Internal hardware error. |
| -1339 | PCA C1 Error | Internal hardware error. |
| -1340 | PCA C2 Error | Internal hardware error. |
| -1341 | PCA D1 Error | Internal hardware error. |
| -1342 | PCA D2 Error | Internal hardware error. |
| -1343 | PCA D3 Error | Internal hardware error. |
| -1344 | PCA D4 Error | Internal hardware error. |
| -1345 | PCA D5 Error | Internal hardware error. |
| -1346 | PCA D6 Error | Internal hardware error. |
| -1347 | PCA D7 Error | Internal hardware error. |
| -1348 | PCA D8 Error | Internal hardware error. |
| -1349 | PCA U1 Error | Internal hardware error. |
| -1350 | PCA U2 Error | Internal hardware error. |
| -1351 | PCA U3 Error | Internal hardware error. |
| -1352 | PCA U4 Error | Internal hardware error. |
| -1359 | Desaturation | PCA switch desaturation error. Output is off. |
| -1360 | Open Fuse | PCA open fuse error. Output is off. |
| -1361 | Over Temperature | PCA over temperature error. Output is off. |
| -1362 | LV PS Under Voltage | PCA LVPS under voltage error. Output is off. |
| -1363 | UUT Over Current | PCA over current error. Output is off. |
| -1364 | Grid Over Current | PCA over current error. Output is off. |
| -1365 | DC-DC Over Current | PCA over current error. Output is off. |
| -1366 | Grid Imbalance | Grid imbalance error. Output is off. |
| -1394 | Safety Trip UUT OT | Temperature was greater than programmed Temperature trip, Output is off. |
| -1395 | Parallel | Parallel configuration error; Missing or bad sync cable. |
| -1396 | UUT Reversed Voltage | The voltage sense leads are reversed (negative voltage). Output is off. |
| -1397 | UUT Over Voltage | Power terminals over voltage. Output is off. |
| -1398 | Safety Trip Remote | A remote safety trip has occurred. Output is off. |
| -1498 | Watchdog Error | The NetBurner to DSP watchdog timer tripped. |
| -1499 | Internal Netburner Error | DSP to NetBurner handshake did not complete. |
| 101 | Grid over- frequency, Output is off | Grid-side frequency is too high. |
| 102 | Grid under- frequency, Output is off | Grid-side frequency is too low. |
| 103 | Internal under-voltage, Output is off | Internal hardware error. (Reset required) |
| 104 | Internal over-voltage, Output is off | Internal hardware error. (Reset required) |
| 105 | Internal over-temperature, Output is off | Internal hardware error. (Reset required) |
| 106 | The Grid turn on sequence failed, Output is off | Internal error during grid turn-on. (Reset required) |
| 107 | Grid over-voltage, Output is off | Internal hardware error. (Reset required) |
| 108 | Grid under-voltage, Output is off | Internal hardware error. (Reset required) |
| 109 | Current was greater than programmed current trip for longer than the current trip delay, Output is off | Output current exceeded programmable Safety limit. |
| 110 | Voltage was less than programmed voltage trip for longer than the voltage trip delay, Output is off | Output voltage less than programmable Safety limit |
| 111 | Voltage was greater than programmed voltage trip for longer than the voltage trip delay, Output is off | Output voltage exceeded programmable Safety limit. |
| 112 | Power was greater than programmed power trip for longer than the power trip delay, Output is off | Output power exceeded programmable Safety limit. |
| 113 | Insufficient voltage was/is at the E-Off input, Output is off | The E-Stop was/is open. (Reset required) |
| 114 | Internal Processor Watchdog Error | DSP did not receive Service Watchdog command within watchdog timeout period, Output is off. |
| 115 | Application Watchdog Error | The application watchdog timer tripped. |
| 204 | Fatal error: unknown device type | The ID returned by the DSP was not recognized. |
| 205 | Fatal error: range count is invalid | The number of ranges returned by the DSP was unexpected. |