提前多少？

http://www.astm.org/Standards/E1948.htm 可以看看这个标准。。或许能找到答案吧。求高人下载

不一定，之前提前的多一点，大概会提前零点几分钟。后面色谱柱截短了，两者的时间就接近了，现在只是提前零点零几。

用A牌软件发现25.3分钟同样无峰，不能查看质谱图。。。。格式肯定不一样

CDF文件信息打开后的信息：
data=mzcdfread('2.CDF');

Reading filename: 2.CDF
Number of dimensions: 13 Unlimited Dimension: 9
Number of variables: 28 Number of attributes: 37

Exploring global netCDF attributes:
dataset_completeness -> C1+C2
ms_template_revision -> 1.0.1
netcdf_revision -> 2.3.2
languages -> English
administrative_comments ->
netcdf_file_date_time_stamp -> 20140404082754+0000
experiment_title ->
experiment_date_time_stamp -> 20131211105825+0000
operator_name -> Admin
source_file_reference -> D:\gc-MS\20131211-3.qgd
source_file_format -> Shimadzu gcMSsolution
source_file_date_time_stamp -> 20131211105825+0000
experiment_type -> Centroided Mass Spectrum
sample_internal_id ->
sample_comments ->
sample_state -> Other State
test_separation_type -> Gas-Solid Chromatography
test_ms_inlet -> Other Probe
test_ionization_mode -> Electron Impact
test_ionization_polarity -> Positive Polarity
test_electron_energy -> 70.000000
test_detector_type -> Electron Multiplier
test_resolution_type -> Constant Resolution
test_scan_function -> Mass Scan
test_scan_direction -> Up
test_scan_law -> Quadratic
test_scan_time -> 0.000000
raw_data_mass_format -> Double
raw_data_time_format -> Long
raw_data_intensity_format -> Long
units -> Seconds
scale_factor -> 1.000000
long_name -> Seconds
starting_scan_number -> 0.000000
actual_run_time_length -> 3299.000000
actual_delay_time -> 0.000000
raw_data_uniform_sampling_flag -> 1.000000

Exploring netCDF dimensions:
Name Length Dim_ID
_2_byte_string 2 1
_4_byte_string 4 2
_8_byte_string 8 3
_16_byte_string 16 4
_32_byte_string 32 5
_64_byte_string 64 6
_128_byte_string 128 7
_255_byte_string 255 8
range 2 9
point_number 2774312 10
error_number 1 11
scan_number 5880 12
instrument_number 1 13

Reading netCDF variables:
Name Type Dim_ID NumAtt
error_log 2 6 11 0
a_d_sampling_rate 6 12 0
a_d_coaddition_factor 3 12 0
scan_acquisition_time 6 12 0
scan_duration 6 12 0
inter_scan_time 6 12 0
resolution 6 12 0
actual_scan_number 4 12 0
total_intensity 6 12 1
units -> Total Counts
mass_range_min 6 12 0
mass_range_max 6 12 0
time_range_min 6 12 0
time_range_max 6 12 0
scan_index 4 12 0
point_count 4 12 0
flag_count 4 12 0
mass_values 6 10 3
units -> M/Z
scale_factor -> 1.000000
long_name -> m/z
intensity_values 4 10 4
units -> Total Counts
add_offset -> 0.000000
scale_factor -> 1.000000
long_name -> Intensity
instrument_name 2 5 13 0
instrument_id 2 5 13 0
instrument_mfr 2 5 13 0
instrument_model 2 5 13 0
instrument_serial_no 2 5 13 0
instrument_sw_version 2 5 13 0
instrument_fw_version 2 5 13 0
instrument_os_version 2 5 13 0
instrument_app_version 2 5 13 0
instrument_comments 2 5 13 0

应助达人

不知道怎样看或下载？

应助达人

应该用一般工作站能打开的。

应助达人

有的项目看不懂，不明白是什么意思。

ASTM E1948 - 98(2009)

Standard Guide for Analytical Data Interchange Protocol for Chromatographic Data 没有找到相关的下载。。。論坛里高人多，或许可以找到电子版的

我的压缩软件的问题，后来修复便可打开