DH Instruments PPCH-G, Operation And Maintenance Manual

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4. REMOTE OPERATION
Page 99 © 2007 DH Instruments, a Fluke Company
GPIB
Purpose Read or set the GPIB interface address.
Command
Query “GPIB addr ”
“GPIB?”
Classic “GPIB= addr ”
“GPIB”
Defaults “GPIB 10”
Arguments addr: The address of the GPIB488 interface (1 to 31)
Remarks The GPIB address is changed following the reply of this command. Each device on a GPIB
interface bus requires a unique address.
Example
(enhanced) Cmd sent:
Reply “GPIB 21”
“21”
(No reply if GPIB-488)
Example
(enhanced) Cmd sent:
Reply “GPIB? 21”
“21”
Example
(classic) Sent:
Reply: “GPIB=21”
“21”
Errors ERR# 6: The argument is not within given limits.
See Also: 3.5.2.2, 4.2.1.2
HEAD
Purpose Read or set the fluid head settings.
Command
Query “HEAD h,u,f ”
“HEAD?”
Classic “HEAD= h,u,f ”
“HEAD”
Defaults “HEAD 0,cm,N2”
Arguments h: The height of the test in relation to the PPCH-G. This is positive if the test
is above the PPCH-G, or negative if below the PPCH-G. This value can be
between
- 9999 and 9999. Setting this value to ‘0’ disables the head correction.
u: The height units. This must be “in” or “cm”.
f: The fluid type. This must be “N2”, “Air”, “He”, “Oil”, “H2O”, or “User”.
Remarks The PPCH-G can make a fluid head correction to allow it to display the pressure at the level
of the device under test instead of at the level of the PPCH-G.
Example
(enhanced) Cmd sent:
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: 3.3.7, 3.5.3
HS
Purpose “Static” or “dynamic” control modes: Read or set the automated pressure control hold limit as
a pressure value.
“Monotonic” control mode: Read or set the “target limit” as a pressure value.
Command
Query “HS limit ”
“HS?”
Classic “HS= limit ”
“HS”
Arguments Limit: The limit in the current pressure unit of measure.
Remarks The “hold” or “target” limit can be read and set as a pressure. The “hold” limit applies to
“static” and “dynamic” control modes only. These limits are part of the ready criteria. The
“target” limit applied to “monotonic” control mode only. If this program message is used to set
the hold or target limit, the PPCH-G will then use CUSTOM control settings
Example
(enhanced) Cmd sent:
Reply: “HS .1”
“0.100 MPa”
(No reply if GPIB-488)
Example
(enhanced) Cmd sent:
Reply: “HS? .1”
“0.100 MPa”
Example
(classic) Sent:
Reply: “HS=0.1”
“0.100 MPa”
Errors ERR# 6 The ‘limit’ argument was invalid.
See Also “HS%”, “MODE”
3.2.2.2, 3.2.2.4