Snap-On Diagnostics DGA 1000, Manual, Page: 40 / 116

2-8
Analyzer Screen Display Features
Gas tag values
Use this function to enter calibration gas bottle values for gas
calibration.
✓
The calibration gas values must be entered to perform a
gas calibration. Refer to
Chapter 4–Maintenance .
Gas calibration
Use this function in conjunction with gas tag values to perform a
gas calibration.
✓
A gas calibration kit is required to use this function. Refer
to
Chapter 4–Maintenance
.
4. Settings (from Test Menu)
Select and press ENTER to change the system settings.
Lambda or AFR
Select either Lambda (
λ
) or AFR (Air Fuel Ratio) for display on the
Measurement Screen. To change the setting:
— Press ENTER,
— Arrow (
) to select choice, and then
— Press ENTER for desired choice.
✓
For additional information refer to Lambda and AFR
Calculation‚ page 2-4 .
LPG
Select the correct mixture between C
4
H
10
(butane) and C
3
H
8
(propane) of the LPG fuel used by the vehicle under test.
To change ratio press ENTER and then arrow ( ) to select
various combinations. Press ENTER when desired mix is
obtained.
✓
U.S.A. propane is, on average, 0% butane and 100%
propane.
Hydrogen/Fuel Ratio (HCV) and Oxygen/Fuel Ratio (OCV)
H
CV
is the ratio between hydrogen and carbon in the fuel. O
CV
is
the ratio between oxygen and carbon in the fuel. These values are
used for calculation of Lambda. The values are automatically set
dependent on fuel type and can not be changed!
Figure 2-7 : Settings Screen 1