5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 117 © 1998 DH Instruments, Inc.
5.5 DIAGNOSTIC FUNCTION
The PPC2 AF diagnostic menu allows access to advanced functions that allow the user to view low level
data and to edit manufacturer calibration settings that alter the operation of the PPC2 AF. Users should
not access this menu without instruction from DH Instruments or full knowledge of these functions. This
section assumes a high level of familiarity with the fundamentals of the PPC2 AF. Access to these
functions is tracked by the PPC2 AF to deter access.
5.5.1 MODE
The Diagnostic code is a decimal number that represents a bit field used to enable specific
diagnostic modes in the PPC2 AF. Most of these modes enable the PPC2 AF to print
specialized data out of the COM1 port as events occur. This allows data logging using a host
computer. These diagnostic modes can be ‘ORed’ together to allow multiple modes at the
same time. Too many modes at once can cause garbled data, so this is not the usual usage.
Here is a summary of these modes:
MODE = 1
KEY: Key press & release data.
RATIO: The New calc Ratio, slope, and pressure slope was calc at the start of each generation.
PCALC: The pressure, up & dn offsets, common time, and up & dn normalized slopes, up & dn slope
& fast down slope.
SETTLING: When a settle cycle starts.
SETTLED: When a settle cycle is done.
GEN_STATUS: The generation status:
1 A new generation is preparing to start
2 Quick ramping to the target
4 Quick pulsing to the target.
8 Slow ramping to the target.
16 Slow pulsing to the target.
32 Reached the target, will re-adjust as needed to stay ready.
64 Quick ramping to a vent condition.
128 Vented with the exhaust valve open.
256 Quickly decreasing the pressure to reach a hard vacuum.
512 The system is not generating or holding a pressure.
METHOD: The starting status (see GEN_STATUS), pressure, deltaP, and Slow ramp time away from
target.”
FASTP: The pres, deltaP, pulse period, and fast slope.
SLOWP: Pres, deltaP, offsetPulse, mainPulse, pulseDir, upTrim, dnTrim, pulseAtten.
MODE = 2
Echoes before each slow pulse.
SLOWP: Pres, deltaP, upPulse, dnPulse, pulseDir, upTrim, dnTrim, pulseAtten.
MODE = 4
Echoes for each new reference measurement.
P/R: Pres, Rate
MODE = 16
Echo the slope (cnts/v) and zero (v) of the ambient pres & ambient temp autocal cycle.
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