Gain Preset - Teledyne 7120 Operating Instructions Manual

4 Operation
Close S1-5 range 1
Close S1-6 range 2
Close S1-7 range 3
Close S1-8 cal range
Select STANDBY to restart the system.

4.9.3 Gain Preset

NOTE: This function will apply only for the analizer that has multiple
range and non-linearity.
For nonlinear application, the signal produced by the infrared detector, will
not correspond to the actual gas concentration. The amplification of each range
will not agree, therefore, the gain must be preset in order for the signal to read
linearly. To set the gain, the following must be performed in sequence.
NOTE:Before setting up this feature, you must have a span gas
containing 90%-100% of the lowest range of the analyzer.
1. Set unit range to lowest range.
NOTE:For output reversal, the lowest range should be range 3, else
the lowest range is range 1.
2. Connect span gas to span inlet.
3. Use UP/DOWN key to scroll to the CAL-INDEPD function.
4. Hold Escape/Enter control to ENTER position for approximately 10
seconds until the upper right connect display "ok" message.
5. Use UP/DOWN scroll to select SPAN function, then setup the
setting to span level. Press ENTER key to span.
NOTE:You must do step #5 before the analyzer return to analyze
mode. If the analyzer returns to analyze function, you must
repeat step 3-5 again.
6. Set range to nex range'
7. Repeat steps 3-5 until you reach the last range of the row.
4-34 Teledyne Analytical Instruments
Model 7120