Use the Job Editor to create a new job or to modify the configuration settings of an existing job. The Job Editor opens when users select the New Job icon or the Edit Job icon from the Data Logger Schedule tab toolbar.
The Job Editor provides a series of tabs to configure channel, acquisition, logging, alarm, and event settings. When a job includes strain or bridge channel types users can perform offset null calibration on bridge-based sensors before acquiring data. Users can advance through the tabs sequentially using the Next button, or tap the Finish button on any tab to save the settings in the job and close the Job Editor.
Each saved job appears in the job list on the Data Logger window. Use the Schedule tab toolbar to duplicate jobs, save job settings to a file, and import job settings from one job to another.
The job name is set by default to Job1. Users can enter a new name in the Job Name field.
Use the Channels tab to view the channels included in the job, add or remove channels, and customize channel properties. The channels list includes the name and type of each channel added to the job.
Channels Tab Toolbar | |
Add | Displays the channel types users can add to the acquisition. When a channel type is selected, a Selected Channel(s) dialog box opens for users to choose the channel number. A channel can only be added once. Click OK to add it to the channel list and display its properties. Refer to Channel Properties below for the specific options users can customize for each channel type. |
Remove | Removes the selected channel from the channel list. Note that any channel configured as a trigger source or alarm source cannot be removed until the trigger or alarm is deleted or its source is changed to another channel. |
Import | Imports the channel list from another job in the job list. Tap the down arrow to select the job list to import from. The Import option is only enabled when the channels list is empty (does not contain any channels). |
Move Up Move Down | Moves the selected channel up or down in the channel list. The order of the channel list sets the order of items in the display and in data when it is exported. |
Common Properties | |
Channel Name | Enter a channel name. For display purposes, enter a name less than 18 characters. This value appears in the channel list. |
Range | Select the range from the drop-down list. The values that display are specific to the connected device.Select the range from the drop-down list. The values that display are specific to the connected device. Range displays for all channel types except Thermocouple and RTD. |
Units | For thermocouple channel types select the unit from the drop-down list.For thermocouple and RTD channel types select the unit from the drop-down list. For voltage all all other channel types either select the unit from the drop-down list or enter a custom unit such as 'mV' or 'μV'. Custom units are particularly useful when using a multiplier (see 'Custom Scaling'). |
Custom Scaling | Enable this checkbox to display Multiplier and Offset text boxes for entering custom gain and offset values for acquired data. When enabled, the vertical axis of the strip chart automatically adjusts to reflect the data being plotted. The multiplier is used to calculate the y-axis upper and lower ranges. The offset value is used to offset each data point. |
Display color | The color applied to channel data on the Dashboard. Tap to open a color palette and select a color. |
Thermocouple Properties | |
TC Type | Select the thermocouple type: J, K, B, N, S, T, R, or E. |
Voltage Properties | |
Range | Select the range from the drop-down list. The values that display are specific to the connected device. |
Coupling | Select AC or DC. Configure for DC if the signal has no offset voltage or if the DC content of the acquired signal is important. |
IEPE Properties | |
Sensor Sensitivity | Enter the sensitivity in mV/unit. |
Note: AC coupling is automatically enabled for IEPE channels. | |
RTD Properties | |
R0 | Select the sensor resistance in ohms at 0° C for the Callendar-Van Dusen equation. Refer to the sensor documentation for this constant. |
RTD Type | Select the type of RTD sensor connected to the channel. |
Wiring Configuration | Select the configuration for resistance measurements: 3-wire or 4-wire. |
Callendar - Van Dusen Coefficients | The constants used by the Callendar-Van Dusen equation to measure the RTD temperature. The constant values update according to the RTD Type selected. |
Resistance Properties | |
Wiring Configuration | Select the configuration for resistance measurements: 2-wire or 4-wire. |
Thermocouple Properties | |
Wiring Configuration | Select the thermocouple type: J, K, B, N, S, T, R, or E. |
Bridge Properties | |
Bridge Type | Select the bridge configuration connected to the channel:
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Bridge Resistance | The resistance of the bridge sensor while not under load. Displays only when Bridge Type is set to Quarter Bridge. |
Strain Properties | |
Strain Type | Select the bridge configuration connected to the channel:
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Gauge Factor | The sensitivity of the strain gauge. This value relates the change in electrical resistance to the change in strain. |
Gauge Resistance | The nominal value of each resistance arm. This property only displays when Strain Type is set to half or quarter bridge types. |
Lead Resistance | The resistance of the lead wires that connect to the strain gauge. This resistance can usually be compensated by performing an offset null calibration (refer to the Calibration section below). This property only displays when Strain Type is set to half or quarter bridge types. |
Poisson Ratio | The ratio of lateral strain to axial strain in the material in which you are measuring strain. This property displays only when Strain Type is set to full or half bridge types. |
Use the Acquisition tab to set the sample rate, auto zero mode,, ADC timing mode, and acquisition start and stop settings.
Notes on numeric values Unexpected results may occur when attempting to change a value. Refer to the following information for best results:
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Acquisition Tab | |
Sample Rate | Enter a value in Hz. |
Auto Zero | Specify whether to perform auto zero and compensate for offset errors. When enabled, the internal voltage offset is subtracted from each thermocouple reading, resulting in a more accurate measurement.
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ADC Timing Mode | Specify the timing mode used to acquire data for all channels. The timing mode controls the tradeoff between speed and resolution. Select from the available modes:
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Start Settings | Select the criteria to start the acquisition:
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Stop Settings | Select the criteria to end the job:
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Digital Trigger | |
Source | Select the digital bit to trigger (start/stop) the job. |
Type | Rising Edge: Start or stop on the digital edge of a rising pulse. |
Falling Edge: Start or stop on the digital edge of a falling pulse. | |
Low: Start or stop when the external digital trigger is 0V (logic low or 0). | |
High: Start or stop when the external digital trigger is 5V (logic high or 1). | |
Analog Trigger | |
Source | Select the analog input to trigger (start/stop) the job. |
Type | Above: Start or stop when the reading at the selected Source channel goes above the Threshold. |
Below: Start or stop when the reading at the selected Source channel goes below the Threshold. | |
Inside Window: Start or stop when the reading at the selected Source channel is above the Low Threshold and below the High Threshold. | |
Outside Window: Start or stop when the reading at the selected Source channel is below the Low Threshold or above the High Threshold. | |
Slope Positive: Start or stop when the reading at the selected Source channel transitions from below the Low Threshold to above the High Threshold. | |
Slope Negative: Start or stop when the reading at the selected Source channel transitions from above the High Threshold to below the Low Threshold. | |
Pre-Trigger Sample Count | The number of samples to acquire before the trigger occurs. |
Timeout | The time in seconds to wait before stopping a job. When multiple jobs are defined in a schedule and one job times out, the next job automatically runs according to its configured properties. |
None | Recommended for use when the signal content contains random (white) noise or closely spaced sine waves. |
Hann | Bell-shaped cosine window typically used to analyze continuous signals. Recommended for use when the signal content contains sine waves, a combination of sine waves, vibration data consisting of narrow band random signals, or unknown content. |
Hamming | Bell-shaped cosine window optimized to minimize the maximum (nearest) side lobe. Recommended for use when the signal content consists of closely spaced sine waves. |
Blackman-Harris | Similar to a Hann window, this window has slightly wider main lobe but much better dynamic signal range. It is optimized to provide the minimum side lobe level. |
Blackman | Similar to the Hann and Hamming windows, this window has slightly wider central lobes and less sideband leakage. |
Flat top | Optimized for measuring peak amplitudes of discrete spectral components that are separated by several spectral lines. Recommended for use when the signal consist of sine waves and amplitude accuracy is important. |
When a job includes strain or bridge channel types, users can perform an offset null calibration to compensate for the resistance of the lead wires that connect to the sensor.
For best results, ensure that the sensor is at rest prior to measuring the offset (apply no force, pressure, or torque).
To perform the offset null calibration, enable the checkbox of each channel that you want to to calibrate and tap Measure*. The offset value is calculated and shown on the Measured column. You can accept this value or manually enter a value.
Tap Apply button to accept and apply the value. The Applied column updates with the value.
Tap the Job Editor Finish button to save the applied offset value(s) in the job.
Use the Logging tab to configure data logging and to set logging options. Acquired data is logged to a binary WebDAQ data *.wdd file. Users can save logged data to a WebDAQ storage location or to a mapped network storage location.
Acquiring data at higher speeds can generate large data files. The maximum file capacity of external media formatted with the FAT32 file system is 4 GB. If the log file on FAT32 media exceeds 4 GB, a "File too large" error is returned and the acquisition stops. If you expect to acquire a large amount of data to a single file when logging to external media, reformat the media using a different file system such as NTFS before starting the logging session. Refer to the Frequently Asked Questions (FAQs) topic for more information about file systems.
Logging Tab | |
Log File Options | Specify where to save data and whether to append or overwrite data:
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Use the Alarms tab to add an alarm, set alarm conditions, and specify the action(s) to take when an alarm is triggered, such as send an email or text notification, set the status of a digital bit, or run a specific job.
Notes on numeric values Unexpected results may occur when attempting to change a value, such as numbers shifting to the right. Refer to the following information for best results:
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Alarms Tab | |
New | Adds a new Alarm # tab with configurable options. |
Name | The name assigned to the alarm. Keep the default or enter a new name. For display purposes, enter a name less than 18 characters. |
Type | The input type to use for the alarm. |
Source | The channel used to trigger the alarm. |
FFT channels can only trigger one alarm. | |
Conditions | The conditions that trigger the alarm:
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Actions | Specify the action(s) to take when an alarm condition occurs. Use the ON/OFF toggle switch to enable each action. Descriptions when enabled are listed here:
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Analog | |
Source | The analog channel used to trigger the alarm. |
Alarm Type | Above: Triggers an alarm when the reading at the selected Source channel goes above the Threshold. |
Below: Triggers an alarm when the reading at the selected Source channel goes below the Threshold. | |
Inside Window: Triggers an alarm when the reading at the selected Source channel is within the range defined by the Low and High Threshold. | |
Outside Window: Triggers an alarm when the reading at the selected Source channel is outside of the range defined by the Low and High Threshold. | |
Slope Positive: Triggers an alarm when the reading at the selected Source channel transitions from below the Low Threshold to above the High Threshold. | |
Slope Negative: Triggers an alarm when the reading at the selected Source channel transitions from above the High Threshold to below the Low Threshold. | |
Digital | |
Source | The digital bit used to trigger the alarm. This cannot include any bit used as an alarm action. |
Alarm Type | Rising Edge: Triggers an alarm on the rising edge of a digital pulse. The alarm condition remains true as long as a rising edge is detected within the reset period (defaults to 1 second). |
Falling Edge: Triggers an alarm on the falling edge of a digital pulse. | |
Low: Triggers an alarm when the external trigger is 0V (logic low or 0). | |
High: Triggers an alarm when the external trigger is 5V (logic high or 1). | |
FFT Band Power | |
Source | The FFT channel used to trigger the alarm. |
FFT Size | Specifies how many data points to use when generating the FFTs for the analog input channels. Tap the down arrow and select a value from the list. |
Window Type | None: Recommended for use when the signal content contains random (white) noise or closely spaced sine waves. |
Hann: Bell-shaped cosine window typically used to analyze continuous signals. Recommended for use when the signal content contains sine waves, a combination of sine waves, vibration data consisting of narrow band random signals, or unknown content. | |
Hamming: Bell-shaped cosine window optimized to minimize the maximum (nearest) side lobe. Recommended for use when the signal content consists of closely spaced sine waves. | |
Blackman-Harris: Similar to a Hann window, this window has slightly wider main lobe but much better dynamic signal range. It is optimized to provide the minimum side lobe level. | |
Blackman: Similar to the Hann and Hamming windows, this window has slightly wider central lobes and less sideband leakage. | |
Flat top: Optimized for measuring peak amplitudes of discrete spectral components that are separated by several spectral lines. Recommended for use when the signal consist of sine waves and amplitude accuracy is important. | |
Band | Inside: Triggers an alarm when the reading is within the range defined by the Low and High Frequency. |
Outside: Triggers an alarm when the reading is outside of the range defined by the Low and High Frequency. | |
Type | Above: Triggers an alarm when the reading at the selected Source channel goes above the Threshold. |
Below: Triggers an alarm when the reading at the selected Source channel goes below the Threshold. |
Use the Events tab to enable execution of one or more actions when specified events occur. Up to four event types can be specified for a job. Each event can have up to four actions associated with it that will be executed when the event occurs.
The default action selected when an event type is added is "Log to File".
Events Tab | |
New | Adds a new Event # tab with configurable options. |
Name | The name assigned to the event. Keep the default or enter a new name. For display purposes, enter a name less than 18 characters. |
Type | The type of event used to trigger an action. Select from the list of event types:
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Actions | Specify the action(s) to take when a specified event occurs. Use the ON/OFF toggle switch to enable each action. Descriptions when enabled are listed here:
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