HP 3478A Technical Manual page 32

3478A 3478A
defines the defines the state. state.
commands and the corresponding operating states. commands and the corresponding operating states.
HO Command. The instrument state for this command HO Command. The instrument state for this command
is as follows: is as follows:
Function Function ........ ................. .................. ..................
Range.................. Range......... .................. ..................
Trigger........................ Trigger............... ..................
Number of Digits D Number of Digits Displayed..... isplayed..............
Autozero............ Autozero..................... ..................
In addition, the 3478A's External Trigger is disabled and In addition, the 3478A's External Trigger is disabled and
the instrument is set into the lowest range (R-2) before the instrument is set into the lowest range (R-2) before
Autorange is selected. Autorange is selected. Also, any dat
the Bus or the front panel is erased when the home the Bus or the front panel is erased when the home
command is sent. . The corresponding command is sent The corresponding program codes o
the instrument state are: "FIT4R-2RAZIN4". the instrument state are: "FIT4R-2RAZIN4".
b. b. HI HI Command Command (DCV). (DCV). This command is the same
as the "HO" command, except a trigger occurs and the as the "HO" command, except a trigger occurs and the
resultant output resultant output can can be
program codes are: "FIR-2RAZIN4T3". program codes are: "FIR-2RAZIN4T3".
c. c. H2 H2 Command Command (ACV). (ACV).
command, except the selected function command, except t he selected function is AC Volts.
corresponding program codes are: "F2R-2RAZIN4T3". corresponding program codes are:
d. d. H3 H3 Command Command (2-Wire Ohm (2-Wire Ohms).
command, except the selected function is 2-Wire Ohms. command, except the selected function is 2-Wire Ohms.
The The corresponding corresponding
2RAZIN4T3". 2RAZIN4T3".
e. e. H4 H4 Command Command (4-Wire Ohm (4-Wire Ohms).
command, except the selected function is 4-Wire Ohms. command, except the selected function is 4-Wire Ohms.
The corresponding The corresponding program program codes
1N4T3". 1N4T3".
f. f. H5 H5 Command Command (DCI). (DCI). Same as the "HI" command,
except except the the selected selected function function is is DC
corresponding program codes are: "F5R-2RAZIN4T3". corresponding program codes are:
g. g. H6 H6 Command Command (ACI). (ACI). Same as the "Hi" command,
except the except the selected selected function function is is AC
corresponding program codes are: "F6R-2RAZIN4T3". corresponding program codes are:
h. h. H7 H7 Command Command (Ext. (Ext. Ohms).
command, except the selected function is Extended command, except the selected function is Extended
Ohms (see paragraph 3-118). Ohms (see paragraph 3-118).
program codes are: "F7R-2RAZIN4T3". program codes are: "F7R-2RAZIN4T3".
3-111. Reading Data 3-111. Reading Data from the from the 3478A.
of readings can be output by the 3478A over the HP-IB of readings can be output by the 3478A over the HP-IB
(other data that can be output is discussed in later (other data that can be output is discussed in later
paragraphs). paragraphs). To out To output put a a reading
3478A has to be 3478A has to be addressed to addressed to "talk".
output using 13 ASCII characters and are output using 13 ASCII characters and are in the following
form:. form:.
The The following following lists lists the the home
.................. ................DCV .......DCV (F1)
.......... . 30mV, 30mV, Auto Auto (R-2RA) (R-2RA)
.................. .................. ............ ... Hold Hold (T4)
............... ...... 4 1/2 4 1/2 (N4)
.................. .................. ...............On ......On (Z1)
Also, any data (reading) output to a (reading) output to
program codes of f
This command is the same
be read. read. The The corresponding corresponding
The same as the "HI" The same as the "HI"
is AC Volts. The
"F2R-2RAZIN4T3".
s). Same as the "HI" Same as the "HI"
program program codes codes are: are:
s). Same as the "HI" Same as the "HI"
codes are: are: "F4R-2RAZ "F4R-2RAZ
Same as the "HI" command,
DC Current. Current.
"F5R-2RAZIN4T3".
Same as the "Hi" command,
AC Current. Current.
"F6R-2RAZIN4T3".
Ohms). Same as the "Hl" Same as the "Hl"
The The corresponding corresponding
3478A. Data in the form Data in the form
reading (if ava (if available), t ilable), the
"talk". The readings are The readings are
in the following
home
a. a.
(F1)
(T4)
(N4)
(Z1)
3-112. 3-112. Each character
EOI) is one byte, w EOI) is one byte, which adds up to 13.
be in engineering notation (E-3, E+0, E+3, or E + 6) and be in engineering notation (E-3, E+0, E+3, or E + 6) and
the mantissa will always have I, 2, or 3 digits before the the mantissa will always have I, 2, or 3 digits before the
decimal point decimal point (D.DDDDD, DD.
the 3478A is in the 4 1/2 or 3 1/2 Digit mode, the 5th the 3478A is in the 4 1/2 or 3 1/2 Digit mode, the 5th
and/or 6th digits will be output as zeroes. An overload and/or 6th digits will be output as zeroes. An overload
condition (whether plus or minus) will be output as: + condition (whether plus or minus) will be output as: +
9.99999E + 9. 9.99999E + 9. If a different outp
Front/Rear Switch position, etc.), the other output Front/Rear Switch position, etc.), the other output
The
supersedes the reading. supersedes the
while being output, the 3478A continues the output while being output, the 3478A continues the output
wherever it left off, whe wherever it
output (or any output) can be disabled by a Group output (or any output) can be disabled by a Group
"F3R- "F3R-
Execute Trigger (GET), Clear Message (DCL or SDC), Execute Trigger (GET), Clear Message (DCL or SDC),
sending any valid program code, or pressing the LOCAL, sending any valid program code, or pressing the LOCAL,
Shift, and TEST/RESET buttons o Shift, and
113. 113.
Front/Rear Switch position can be remotely determined Front/Rear Switch position can be remotely determined
by sending program code "S" to the multimeter and then by sending program code "S" to the multimeter and then
reading its o reading its output.
set to Rear, and if "1" (CR LF) is output the switch is set set to Rear, and if "1" (CR LF) is output the switch is set
The The
to Front. to Front.
3-114. Data 3-114.
of the 3478A, when enabled, outputs a Require Service of the 3478A, when enabled, outputs a Require Service
The The
Message (SRQ) after each completed measurement Message (SRQ) after each completed measurement
cycle. Before the message cycle.
SRQ Mask must SRQ Ma
program code "M01" (bit 0 of the Status Byte and Status program code "M01" (bit 0 of the Status Byte and Status
Register). When the Require Register).
the front panel "SRQ" annunciator turns on and bit 0 of the front panel "SRQ" annunciator turns on and bit 0 of
the Status Byte is the Status
the data is read by the controller, or a Serial Poll is done. the data is read by the controller, or a Serial Poll
he
3-115. Front 3-115.
of the 3478A outputs a Require Service Message (SRQ) of the 3478A outputs a Require Service Message (SRQ)
each time the Front Panel SRQ button is pressed. Before each time the Front Panel SRQ button is pressed. Before
the message can be output, bit 4 of the SRQ Mask must the message can be output, bit 4 of the SRQ Mask must
be set. This is done by se be set.
4 of the Status Byte and Status Register). Once this is 4 of the Status Byte and Status Register). Once this is
done, the Require Service Message will be output and done, the Require Service Message will be output and
the front panel SRQ annunciator turns on, whenever the the front panel SRQ annunciator turns on, whenever the
SRQ button SRQ button is pressed.
a Serial Poll is done by the controller. a Serial Poll is done
3-13 3-13
Each character in the o in the output stat
hich adds up to 13. The exponent will
(D.DDDDD, DD.DDDD, or
If a different output is requested (Binary
reading. If a data If a data transfer is interrupt
left off, when addressed n addressed again.
TEST/RESET buttons on the fr
Front/Rear Front/Rear Switch Switch Position. Position.
utput. If "0" (CR LF) is If "0" (CR LF) is output the sw
Data Ready Ready Feature. Feature. The Data Ready feature
Before the message can be outpu can be output, bit 0
sk must be set. be set. This is This is done by
When the Require Service Message
Byte is set. set. The SRQ condition The SRQ condition remains until
Front Panel Panel SRQ. SRQ. The Front Panel SRQ feature The Front Panel SRQ feature
This is done by sending program code "M nding program code "M20" (bit
is pressed. The SRQ condition The SRQ condition remains until
by the controller.
TM 11-6625-3071-14 TM 11-6625-3071-14
utput statement (except ement (except
The exponent will
DDDD, or DDD.DDD). DDD.DDD). If If
ut is requested (Binary, ,
transfer is interrupted ed
again. This partial This partial
n the front panel. ont panel. 3- 3-
The 3478A's The 3478A's
output the switch is itch is
The Data Ready feature
t, bit 0 of the of the
done by sending sending
Service Message is sent, is sent,
remains until
is done.
20" (bit
remains until