PC Interface Software
3
3-4
3.4 Humidity Probe Calibration Procedure (CTXL-TRH)
This is a two point humidity calibration, 33% RH and 75% RH. The temperature
does not require calibration although it can be certified at room or any other
temperature within its operating range. Before the humidity calibration,
you must record the humidity reading of the probe at 33% RH & 75% RH
environments. If the reading accuracy at these two points are /-3% RH,
no calibration is required. Otherwise the probe needs calibration as described
below:
Example: The probe humidity reading at 33% RH is 37% RH and at 75% RH is
72% RH.
(PC commands are in Bold)
1. Connect the CTXL recorder to a PC with the RS232 cable provided.
2. Run HyperTerminal program from the PC. The COM port setting are:
Baud rate: 9600
Data Bits: 8
Parity: None
Stop Bit: 1
3. Turn on the power to the CTXL. The probe does not have to be at any specific
humidity environment (Regular room environment).
4. Type HH then press Enter key from the Hyper Terminal. The following
message shows the previous two calibration data (Factory Default setting are
33% RH and 75% RH) saved in the CTXL memory.
HH; Humidity calibration saved data are:
00033
00075
5. Type HC then press Enter key to start the humidity calibration, and the
following message will appear.
HC; Humidity calibration begins,
Please type HUL followed by the measurement value at 33% RH.
6. Type HUL37 then press Enter key. (37 is the value that the probe was reading
at 33% RH humidity), and the following message will appear:
HUL37; 00037
Please type HUH followed by the measurement value at 75% RH.
7. Type HUH72 then press Enter key. (72 is the value that the probe was reading
at 75% RH humidity), and the following message will appear:
HUH72; 00072
Humidity calibration is done.
00037
00072
8. Now the humidity calibration is complete and the probe reading should be in
specs.
Summary of Contents for CTXL-TRH-W-W9
Page 64: ...6 2 List of Accessories and Charts Papers 6 Notes...
Page 79: ...NOTES 8 13...
Page 80: ...NOTES 8 14...
