Configuration
Whenever the “Data Logger” button in the Instrument Toolbar is clicked, a new data logger window will be opened. A configuration dialog will pop up on the top of the data logger window to allow you to enter the configuration first. Parameters to be configured include the Derived Data Points (DDP) to be logged, Legend (color and label of each DDP), Update Threshold for each DDP (if “Update Threshold” is chosen for the Logging Method), Time Interval (if “Time Intervel” is chosen for the Logging method), Logging Method, etc.
Derived Data Point
In this software, a Derived Data Point (DDP) refers to a data point that is derived from a frame of raw DAQ data. The DDP values are updated whenever a new frame of data arrives. The following derived data points can be selected for logging.
No. |
DDP |
Description |
Source |
1 |
MaxVolt_A(V) |
Maximum Voltage for Channel A |
OSC (&, |) |
2 |
MinVolt_A(V) |
Minimum Voltage for Channel A |
OSC (&, |) |
3 |
MeanVolt_A(V) |
Mean Voltage for Channel A |
OSC (&, |) |
4 |
RMSVolt_A(V) |
RMS Voltage for Channel A |
OSC (&, |) |
5 |
PeakLevelPercent_A(%) |
Peak Level Percentage for Channel A |
OSC |
6 |
PeakFreq_A(Hz) |
Peak Frequency for Channel A |
SPEC (AMP) |
7 |
PeakFreqVolt_A(V) |
Voltage at Peak Frequency for Channel A |
SPEC (AMP) |
8 |
THD_A(%) |
THD in % for Channel A |
SPEC (AMP) |
9 |
THDN_A(%) |
THD+N in % for Channel A |
SPEC (AMP) |
10 |
THDDB_A(dB) |
THD in dB for Channel A |
SPEC (AMP) |
11 |
THDNDB_A(dB) |
THD+N in dB for Channel A |
SPEC (AMP) |
12 |
SINAD_A(dB) |
SINAD in dB for Channel A |
SPEC (AMP) |
13 |
SNR_A(dB) |
SNR in dB for Channel A |
SPEC (AMP) |
14 |
NoiseLevel_A(V) |
Noise Level in Vrms for Channel A |
SPEC (AMP) |
15 |
IMD_A(%) |
IMD in % for Channel A |
SPEC (AMP+IMD) |
16 |
IMD_A(dB) |
IMD in dB for Channel A |
SPEC (AMP+IMD) |
17 |
BandWidthLowLimit_A(Hz) |
Band Width Low Limit for Channel A |
SPEC (AMP+BW) |
18 |
BandWidthHighLimit_A(Hz) |
Band Width High Limit for Channel A |
SPEC (AMP+BW) |
19 |
RMSVoltDBV_A(dBV) |
RMS Voltage in dBV for Channel A |
MM (dBV) |
20 |
RMSVoltDBu_A(dBu) |
RMS Voltage in dBu for Channel A |
MM (dBu) |
21 |
RMSVoltDBSpl_A(dB) |
RMS Voltage in dBSPL for Channel A |
MM (dB) |
22 |
RMSVoltDBSplA_A(dBA) |
RMS Voltage in dBSPL(A) for Channel A |
MM (dBA)
SPEC (AMP+A) |
23 |
RMSVoltDBSplB_A(dBB) |
RMS Voltage in dBSPL(B) for Channel A |
MM (dBB)
SPEC (AMP+B) |
24 |
RMSVoltDBSplC_A(dBC) |
RMS Voltage in dBSPL(C) for Channel A |
MM (dBC)
SPEC (AMP+C) |
25 |
Freq_A(Hz) |
Counted Frequency for Channel A |
MM (Freq. Counter) |
26 |
RPM_A(rpm) |
Counted RPM for Channel A |
MM (RPM) |
27 |
TotalCount_A |
Total Count for Channel A |
MM (Counter) |
28 |
DutyCycle_A(%) |
Duty Cycle for Channel A |
MM (Duty Cycle) |
29 |
FVC_A(V) |
Voltage after F/V conversion for Channel A |
MM (F/V) |
30 |
AccelerationRMS_A(g) |
Reserved for future use |
|
31 |
AccelerationRMS_A(m/s^2) |
Reserved for future use |
|
32 |
AccelerationPeak_A(g) |
Reserved for future use |
|
33 |
AccelerationPeak_A(m/s^2) |
Reserved for future use |
|
34 |
AccelerationCF_A |
Reserved for future use |
|
35 |
VelocityRMS_A(mm/s) |
Reserved for future use |
|
36 |
VelocityPeak_A(mm/s) |
Reserved for future use |
|
37 |
VelocityCF_A |
Reserved for future use |
|
38 |
DisplacementRMS_A(µm) |
Reserved for future use |
|
39 |
DisplacementRMS_A(µm) |
Reserved for future use |
|
40 |
DisplacementCF_A |
Reserved for future use |
|
41 |
MaxVolt_B(V) |
Maximum Voltage for Channel B |
OSC (&, |) |
42 |
MinVolt_B(V) |
Minimum Voltage for Channel B |
OSC (&, |) |
43 |
MeanVolt_B(V) |
Mean Voltage for Channel B |
OSC (&, |) |
44 |
RMSVolt_B(V) |
RMS Voltage for Channel B |
OSC (&, |) |
45 |
PeakLevelPercent_B(%) |
Peak Level Percentage for Channel B |
OSC |
46 |
PeakFreq_B(Hz) |
Peak Frequency for Channel B |
SPEC (AMP) |
47 |
PeakFreqVolt_B(V) |
Voltage at Peak Frequency for Channel B |
SPEC (AMP) |
48 |
THD_B(%) |
THD in % for Channel B |
SPEC (AMP) |
49 |
THDN_B(%) |
THD+N in % for Channel B |
SPEC (AMP) |
50 |
THDDB_B(dB) |
THD in dB for Channel B |
SPEC (AMP) |
51 |
THDNDB_B(dB) |
THD+N in dB for Channel B |
SPEC (AMP) |
52 |
SINAD_B(dB) |
SINAD in dB for Channel B |
SPEC (AMP) |
53 |
SNR_B(dB) |
SNR in dB for Channel B |
SPEC (AMP) |
54 |
NoiseLevel_B(V) |
Noise Level in Vrms for Channel B |
SPEC (AMP) |
55 |
IMD_B(%) |
IMD in % for Channel B |
SPEC (AMP+IMD) |
56 |
IMD_B(dB) |
IMD in dB for Channel B |
SPEC (AMP+IMD) |
57 |
BandWidthLowLimit_B(Hz) |
Band Width Low Limit for Channel B |
SPEC (AMP+BW) |
58 |
BandWidthHighLimit_B(Hz) |
Band Width High Limit for Channel B |
SPEC (AMP+BW) |
59 |
RMSVoltDBV_B(dBV) |
RMS Voltage in dBV for Channel B |
MM (dBV) |
60 |
RMSVoltDBu_B(dBu) |
RMS Voltage in dBu for Channel B |
MM (dBu) |
61 |
RMSVoltDBSpl_B(dB) |
RMS Voltage in dBSPL for Channel B |
MM (dB) |
62 |
RMSVoltDBSplA_B(dBA) |
RMS Voltage in dBSPL(A) for Channel B |
MM (dBA)
SPEC (AMP+A) |
63 |
RMSVoltDBSplB_B(dBB) |
RMS Voltage in dBSPL(B) for Channel B |
MM (dBB)
SPEC (AMP+B) |
64 |
RMSVoltDBSplC_B(dBC) |
RMS Voltage in dBSPL(C) for Channel B |
MM (dBC)
SPEC (AMP+C) |
65 |
Freq_B(Hz) |
Counted Frequency for Channel B |
MM (Freq. Counter) |
66 |
RPM_B(rpm) |
Counted RPM for Channel B |
MM (RPM) |
67 |
TotalCount_B |
Total Count for Channel B |
MM (Counter) |
68 |
DutyCycle_B(%) |
Duty Cycle for Channel B |
MM (Duty Cycle) |
69 |
FVC_B(V) |
Voltage after F/V conversion for Channel B |
MM (F/V) |
70 |
AccelerationRMS_B(g) |
Reserved for future use |
|
71 |
AccelerationRMS_B(m/s^2) |
Reserved for future use |
|
72 |
AccelerationPeak_B(g) |
Reserved for future use |
|
73 |
AccelerationPeak_B(m/s^2) |
Reserved for future use |
|
74 |
AccelerationCF_B |
Reserved for future use |
|
75 |
VelocityRMS_B(mm/s) |
Reserved for future use |
|
76 |
VelocityPeak_B(mm/s) |
Reserved for future use |
|
77 |
VelocityCF_B |
Reserved for future use |
|
78 |
DisplacementRMS_B(µm) |
Reserved for future use |
|
79 |
DisplacementRMS_B(µm) |
Reserved for future use |
|
80 |
DisplacementCF_B |
Reserved for future use |
|
81 |
PeakCCFTimeDelay_AB(s) |
Time Delay at the peak of the Cross-Correlation Function |
SPEC (CCF) |
82 |
PeakCCFCoef_AB |
Peak Cross-Correlation Function Coefficient |
SPEC (CCF) |
83 |
PeakCHFFreq_AB(Hz) |
Frequency at the peak of the Coherence Function |
SPEC (CHF) |
84 |
PeakCHFCoef_AB |
Peak Coherence Function Coefficient |
SPEC (CHF) |
85 |
PeakGainFreq_AB(Hz) |
Frequency at the peak of the Gain |
SPEC (G&P) |
86 |
PeakGainValue_AB(dB) |
Peak Gain Value |
SPEC (G&P) |
87 |
PeakGainPhase_AB(D) |
Phase at the peak of the Gain |
SPEC (IPR) |
88 |
PeakIPRTime_AB(s) |
Time at the peak of the Impulse Response |
SPEC (IPR) |
89 |
PeakIPRValue_AB |
Peak Impulse Response Value |
SPEC (IPR) |
90 |
GainAtGeneratedFreq(dB) |
Gain at the frequency generated by the Signal Generator |
SPEC (G&P,GEN) |
91 |
PhaseAtGeneratedFreq(D) |
Phase at the frequency generated by the Signal Generator |
SPEC (G&P,GEN) |
92 |
CrossTalkAB(dB) |
Crosstalk from Channel A to Channel B |
SPEC(AMP,CT) |
93 |
CrossTalkBA(dB) |
Crosstalk from Channel B to Channel A |
SPEC(AMP,CT) |
Legend: OSC---Oscilloscope, SPEC---Spectrum Analyzer, GEN---Signal Generator, MM---Multimeter
Legend
Each DDP can be assigned a unique color and label.
Logging Method
Three logging methods are supported:
- Fastest: The data logger will take one record whenever new data are available
- Time Interval: The data logger will take one record whenever new data are available and the specified time duration has elapsed since the last update.
- Update Threshold: The data logger will take one record whenever new data are available and the change of any DDP compared with its last update exceeds the specified update threshold for that DDP.
Log File Name
For real time logging, there is no need to specify the log file name as it will be assigned automatically by the software, according to the following naming convention:
Example: 2007-10-31-09-55-45-180-1.log
where:
- 2007 -----Year: 2007
- 10---------Month: October
- 31---------Day: 31
- 09---------Hour: 9
- 55---------Minute: 55
- 45---------Second: 45
- 180--------Minisecond: 180
- 1-----------Data Logger Window No.: 1
- .log--------File Extension
The above time stamp corresponds to the first data point captured in the data logger window. The logged data will be automatically written to the hard disk once the number of data points per trace exceeds 32767. A new log file will be created automatically afterwards to continue the logging process. Note that the logged data will be lost if the DDP configuration is changed before the data in memory are saved to the hard disk. If you do not want to lose the data, you should perform “Data Logger Export” or “Data Logger Copy As Text” command first.
The log file name is always displayed in the title bar of the data logger window. A “*” sign will be displayed on the right of the log file name if the log file has not been persisted in the hard disk.
Pressing the “File Open” button in the Configuration dialog will allow you to select and load a historical log file for review.
The log file is a Comma Separated Variable (CSV) TXT file. It has the following format which is self-explanatory. All data are logged with accuracy in minisecond.
No., Time(s), MaxVolt_A(V), MinVolt_A(V), MeanVolt_A(V)
1, 2007-10-31 12:04:52:021, -0.0132446, -0.0142517, -0.0137236
2, 2007-10-31 12:04:53:022, -0.0132751, -0.0144348, -0.0139354
......
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