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HP 3421A COMMAND REFERENCE
The keywords CMDO=421, SEHDZ421, and the subprogram SLCHM in the Data Management Pac send
command strings to the HP 3421A Data Acquisition/Control Unit to select measurement and control
options.
The HP 3421A command set consists of standard commands and advanced commands. Each
standard command performs a complete measurement or control function. Two or more advanced
commands are generally required to perform a single measurement.
Refer to the HP 34214 Data
Acquisition/Control Unit Operating, Programming, and Configuration Manual for detailed information on
each command.
Syntax:
[] means optional channel or bit list
<> means mandatory channel or bit list
Standard Commands
DC[ade eww Z)
DC Volts. Sets the voltmeter to DCV (Fl), Autorange (RA 1), Autozero on
(Z1), 5 1/2-digit resolution (NS). If no channel list is sent, the channellist is
not changed but software single trigger is executed (T2). If a channel list is
sent, the channels are measured in the order received (T3).
DCV always
opens the last channel before closing the next channel in the list. It exits with
the last channel in the list closed. If no channel list was received, the channels
remain in the same state they were in prior to the command. When the
HP 3421A is addressed to talk, the readings are sent in the sequence of the
channel list.
HCW [ada we o
Same as for DCV but for AC Volts (F2) and 4 1/2 digit resolution (N4).
THO [#ada www)
Same as for DCV but for 2-wire ohm (F3) measurements.
FMD [Hada ww)
Same as for DCV but for 4-wire ohm (F4) measurements. Channels are
automatically paired with x+10 MOD 30. Pairs are closed simultaneously.
TEM [ads ow ae]
Same
as
for
DCV,
but
for
temperature
measurements
(F6).
A
software-compensated T-type thermocouple converision is done, and the
result is returned in Degrees C. TEI[1 will take a FEF temperature
measurement
on
the
HP 44462A
Multiplexer assembly
in
the
lowest
numbered slot if no channel numbers are sent.
FEF [ads «waZ]
Measures the temperature of the REFerence junction (FS) on the HP 44462A
Multiplexer assembly where channel 'x' is. If 'x' is not sent, the assembly with
a closed multiplexer channel is measured.
If all channels are open, the
HP 44462A assembly in the lowest numbered slot is measured. The result is
returned in Degrees C.
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