7.2. Error and Status Messages
The following are error and status messages that may be displayed by the M81-SSM during operation.
SCPI Error Messages
Critical startup errors:
The following are errors that may be displayed during startup. These errors are critical and will prevent the M81-SSM from functioning properly. Please contact Lake Shore Service for support see Technical Inquiries for more information.
Error |
SCPI error code |
Description |
---|---|---|
Invalid calibration |
-340 |
The calibration is not valid. The data is either corrupt, uninitialized or default values. |
NOVRAM not communicating |
-320 |
Indicates that a NOVRAM device failed to initialize. See Summary of Internal Memory Devices for more information about memory devices. |
Model ID not communicating |
-300 |
Indicates that the device used to store the model ID failed to initialize. |
Rev ID not communicating |
-300 |
Indicates that the device used to store the revision ID failed to initialize. |
Line frequency out of bounds |
-300 |
Indicates the detected line frequency is out of normal operating range. A default value of 60 Hz is used. |
ADC config corrupt |
-300 |
Indicates that an invalid internal ADC configuration was detected. |
Invalid channel card configuration |
-300 |
Indicates that an invalid channel card configuration was detected. This typically indicates that an expected channel card was not detected. |
Runtime errors:
The following are errors that may be displayed during operation. These errors are critical and will prevent the M81-SSM from functioning properly. Please contact Lake Shore Service for support see Technical Inquiries for more information.
Error |
SCPI error code |
Description |
---|---|---|
Overflow |
-240 |
Internal data streaming buffer overflow. You can continue, but note that data loss has occurred during a data stream. |
Measure module I2C corrupt |
-240 |
Failed readback on the specified measure module I2C write. |
Source module I2C corrupt |
-240 |
Failed readback on the specified source module I2C write. |
Head temp sensor failure |
-240 |
Failed to communicate with the head board temperature sensor. |
Measure module temp sensor failure |
-240 |
Failed to communicate with the specified measure module temperature sensor. |
Source module temp sensor failure |
-240 |
Failed to communicate with the specified source module temperature sensor. |
Master reference error |
-240 |
The measured master reference voltage is out of bounds. |
Source gain max correction |
-240 |
Computed gain factor is out of bounds on the specified source module. |
Source offset max correction |
-240 |
Measured offset is too large on the specified source module. |
Source DC gain max correction |
-240 |
Computed gain factor is out of bounds on the specified source module’s DC chain. |
Source DC offset max correction |
-240 |
Measured offset is too large on the specified source module’s DC chain. |
Measure gain max correction |
-240 |
Computed gain factor is out of bounds on the specified measure module. |
Measure offset max correction |
-240 |
Measured offset is too large on the specified measure module. |
Measure voltage nulling limit |
-240 |
Input offset voltage is too large to correct on the specified measure module. |
Measure current nulling limit |
-240 |
Input bias current is too large to correct on the specified measure module. |
Measure module JSON checksum |
-230 |
Checksum validation of the specified measure module’s JSON NOVRAM data has failed. |
Source module JSON checksum |
-230 |
Checksum validation of the specified source module’s JSON NOVRAM data has failed. |
Internal communication error |
N/A |
Internal communication between the instrument’s microcontrollers or hardware was interrupted. This typically occurs when a module is unplugged without first unloading it. See Module Loading for details on how to properly load and unload modules. When this error is encountered the instrument will attempt to re-estabilish communication. If it is able to do so, an option to continue will be presented ortherwise the instrument will need to be restarted. |
Module connect errors:
The following are errors that may be displayed when connected modules are loaded. The module will not function until the error is corrected.
Error |
Description |
---|---|
Read error |
There was an error identifying the connected module. |
Unrecognized module error |
The connected module was identified, but is not supported with this firmware version. This can typically be resolved by updating the firmware. |
Port direction error |
The connected module was plugged into the wrong port. For example, a source module was plugged into a measure port. This can typically be resolved by plugging the module into the correct port type. |
Measurement status messages:
The following are status messages that may be displayed during measurement. Readings may not be available when these messages are displayed.
Status |
Description |
---|---|
Settling |
The measurement is settling due to a hardware change. |
Overload |
The module is in an active overload. |
Unlocked |
The module’s lock-in amplifier is unlocked. |
V Limit |
The module is at its voltage limit. |
I Limit |
The module is at its current limit. |
Self-calibration status messages:
The following are status messages that may be displayed during self-calibration.
Status |
Description |
---|---|
In progress |
The calibration is in progress. See specific step details. |
Initializing step |
Getting ready to run calibration. |
Learning reference step |
Measuring internal reference against external calibrator. |
Measuring references step |
Measuring internal reference voltage. |
Calibrating source step |
Calibrating specified source channel. |
Calibrating measure step |
Calibrating specified measure channel. |
Voltage offsets step |
Calibrating offset for specified voltage range. |
Nulling current step |
Calibrating offsets. |
Nulling voltage step |
Adjusting input offset voltage. |
Self-calibration successful |
Calibration completed successfully. |
Resistance calculation status messages:
The following are status messages that may be displayed during self-calibration.
Status |
Description |
---|---|
S MISS |
The selected source module is not connected. |
S UNL |
The selected source module is connected but not loaded. |
INVALID |
The source module is not compatible with the measure module for calculating resistance. This occurs when the two modules use the same units, such as a VM-10 and VS-10. |
E TYPE |
The excitation type is not valid. This occurs when the measure mode and source shape do not create a supported resistance calculation. |
DIV BY 0 |
The sourced or measured current is 0. |
M ERR |
There is an active error on the measure module. |
S ERR |
There is an active error on the source module. |