time stamp error

The internal code that runs the MFRSR data logger
had a bug that occasionally caused the time stamp associated with the data to
be slightly in error.  This error is thought to be very small (say less than
30 seconds) and very infrequent.  (Unfortunately, we cannot give firm
estimates of the magnitude and frequency of the error). 

After 96/07/17 the problem was corrected.  Those who use the data before this
time should realize that the time stamp for each record of data might be
slightly in error.

• Hemispheric Irradiance, MFRSR(hemisp_narrowband)
• -180.0 - +180.0(alt)
• Ventilated Pyrgeometer Dome Temperature(down_long_dome_temp)
• Flag fields with *1 returned from callang(flag_zero_divisor1-24)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• 25 meter Upwelling Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
• North Latitude(lat)
• Flag fields with *3 returned from callang(flag_zero_cosine1-24)
• Data logger supply voltage(logger_volt)
• Thermistor Excitation Voltage, Data Logger(therm_volt)
• Direct Normal Irradiance, MFRSR(direct_norm_broadband)
• Hemispheric broadband irradiance(hemisp_broadband)
• 10 meter Longwave Dome Temperature, Pyrgeometer(up_long_dome_temp)
• Data Logger Temperature(logger_temp)
• 25 meter Longwave Case Temperature, Pyrgeometer(up_long_case_temp)
• 10 meter Upwelling Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
• lon(lon)
• MFRSR channels(channel)
• Time offset from base_time(time_offset)
• Shortwave direct normal irradiance, pyrheliometer(short_direct_normal)
• Flag fields with *4 returned from callang(flag_nighttime1-24)
• Downwelling Longwave Diffuse Hemispheric Irradiance, Ventilated Pyrgeometer(down_long_diffuse_hemisp)
• MFRSR Detector Temperature(mfrsr_temp)
• Down-welling unshaded pyranometer voltage(down_short_hemisp)
• Flag fields with *2 returned from callang(flag_ln_error1-24)
• Diffuse Hemispheric Broadband Irradiance, offset corrected(diffuse_hemisp_broadband)
• Diffuse Hemispheric Irradiance, MFRSR(diffuse_hemisp_narrowband)
• Ventilated Pyrgeometer Case Temperature(down_long_case_temp)
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• base time in epoch(base_time)