DH Instruments PPC2+, Manual

Page: 101 / 166

PPC2+™ Operation and Maintenance Manual
Page 93
©2001 DH Instruments, Inc.
HEAD
Purpose Read or set the head settings.
Command
Query
“HEAD h,u,g”
“HEAD?”
Classic “HEAD= h,u,g”
“HEAD”
Defaults “HEAD 0,cm,N2”
Arguments h The height of the test in relation to the PPC2+. This will be positive if
the test is above the PPC2+, or negative if below the PPC2+. This
value can be between -9999 and 9999. Setting this value to ‘0’ will
disable the head correction.
u The height units. This must be “in” or “cm”.
g The gas type. This must be “N2”, “Air” or “He”.
Remarks The PPC2+ can make a head correction to allow it to display the pressure at the test
instead of the pressure at the PPC2+.
Example
(enhanced)
Cmd sent:
Query reply:
“HEAD 10,in,N2”
“10, in, N2”
Example
(classic)
Sent:
Reply:
“HEAD=10,in,N2”
“10, in, N2”
Errors ERR# 6: The arguments are not within given limits.
See Also: Section 3.2.7
HOLD
This is an obsolete PPC2 Command.
Purpose Makes the current pressure the target pressure and controls to the target pressure in
the current control mode.
HS
Purpose Read or set the hold limit for automated pressure control.
Command
Query
“HS n”
“HS?”
Classic “HS= n”
“HS”
Arguments n: The hold limit in the current pressure units.
Remarks The hold limit can be read and set as a pressure.
Example
(enhanced)
Cmd sent:
Query reply:
“HS .1”
“0.1 kPa”
Example
(classic)
Sent:
Reply:
“HS=0.1”
“0.1 kPa”
Errors ERR# 6 The
‘n’ argument was invalid.
See Also Sections 3.1.2.3, 3.1.2.4, 3.2.3, 3.2.6