6600-NG User’s Manual
125-9110A
Page 47
Independent Pt Leak-check
The ideal way to perform a Pt leak-check is to keep Ps1 and Ps2 in Control at “Ground’ and control Pt to
120 knots before starting the leak check. Below is a step-by-step process of performing the Pt leak-check.
It is assumed that the Self-Test has already been performed as described in Section 3.1
1.
Close all three output ports (tightly, please).
2.
Set the Units as follows: Pt=knots, Ps2=Dfin, Ps1=feet. (Key sequence:
1, 1, ENTER, 9, 2, ENTER,
5, 1, ENTER, GO
)
3.
Press
GND
to perform the Go-To-Ground function. The pumps will turn On and the tester will
go through the EQZN process. The targets will automatically be set to Pt=0 knots, Ps2=0.0 Dfin,
Ps1= the feet equivalent to “Ground” (ambient pressure).
4.
Once the EQZN process is completed, the tester will control the Actual values at the Targets.
5.
Change the Pt Target to 120 knots. (Key sequence:
2, 1
,
2
,
0
,
ENTER
) The new Target value will
be blinking. Press
GO
to activate. The Pt Actual value will ramp to 120 knots. The Ps1 and Ps2
outputs will still be controlling at their target values.
6.
Once the Pt Actual reaches 120 knots, allow it to stabilize for a few seconds.
7.
Change the Pt mode to Leak. (Key sequence:
4, 2
). ‘Leak’ will be blinking in the Pt mode field.
Press
GO
to activate.
The Lower section of the screen will appear similar to Figure 3.32 below. The parameters shown in the
Leak screen are explained below, after Figure 3.35.
Figure 3.32 : Pt Leak (start)
At the end of one minute, the screen will appear similar to Figure 3.33 below.
Figure 3.33 : Pt Leak (1-min)
At the end of two minutes, the screen will appear similar to Figure 3.34 below.
Leak Time: 0.00
Control
Leak
Control
4
±
8
000
Hide/Show Ps2
AC
92%
Start: Pt: 120.0 knots
( 1 min) 118.5 1.5
( 2 min)
( 3 min)
Press
CANC
to exit
Leak Time: 0.00
Control
Leak
Control
4
±
8
000
Hide/Show Ps2
AC
92%
Start: Pt: 120.0 knots
( 1 min)
( 2 min)
( 3 min)
Press
CANC
to exit
1
2
2
2
3
2
5
2
4
