A Program Codes - HP 3478A Technical Manual

3478A
Table 3-6. 3478A Program Codes
Type Program
Code
FUNCTION F1
F2
F3
F4
F5
F6
F7
RANGE R-3
R-2
R-1
R0
R1
R2
R3
R4
R5
R6
R7
RA
DIGITS N3
DISPLAYED N4
N5
TRIGGER T1
T2
T3
T4
T5
AUTOZERO Z0
Z1
DISPLAY D1
D2
D3
HOME HO
COMMAND H1
H2
H3
H4
H5
H6
H7
MISC B
COMMANDS
C
E
K
M
S
Description
DC Volts
AC Volts
2-Wire Ohms
4-Wire Ohms
DC Current
AC Current
Extended Ohms (see paragraph 3-118).
most sensitive range on any function
30mV DC, or most sensitive range on any other
function
300mV DC, 3OOmV AC, 300OmA DC, 300mA AC,
or most sensitive range on any other function
3V DC, 3V AC, 3A DC, 3A AC, or most sensitive
range on any other function
30V DC, 30V AC, 30 Ohm, or most sensitive range
on any other function
300V DC, 300V AC, 300 Ohm, or least sensitive
range on any other function
3K Ohm or least sensitive range on any other
function
30K Ohm or least sensitive range on any other
function
300K Ohm or least sensitive range on any other
function
3M Ohm or least sensitive range on any other
function
30M Ohm or least sensitive range on any other
function.
Autorange
3 1/2 Digits Displayed
4 1/2 Digits Displayed
5 112 Digits Displayed
Internal Trigger
External Trigger
Single Trigger
Hold Trigger
Fast Trigger (see paragraph 3-116)
Autozero Disabled
Autozero Enabled
Normal Display Operation
Display Text and update Annunciators
Display Text and turn off Annunciators
Equivalent to "F1T4R-2RAZ1N4"
Equivalent to "F1R-2RAZ1N4T3"
Equivalent to "F2R-2RAZ1N4T3"
Equivalent to "F3R-2RAZ1N4T3"
Equivalent to "F4R-2RAZ1N4T3"
Equivalent to "F5R-2RAZ1N4T3"
Equivalent to "F6R-2RAZ1N4T3"
Equivalent to "F7R-2RAZ1N4T3"
Read Status of the 3478A in Binary
See paragraph 3-119.
Calibrate (see Section IV of this manual)
Read the Error Register. See paragraph 3-1 20.
Clears Status Register
Set SRO Mask (Mdd, where dd is the octal code of
the bits)
Front/Rear Switch Position
77) can be sent to program the mask. The mask can be
cleared by sending: "MOO". Remember, the mask is
only set to output a Require Service Message (not the
Status Byte) for a certain SRQ condition.
3-105. Clearing Status Register (Status Byte). Bits 2
through 5 and 7 of the register can be cleared by sending
program code "K", and by a device CLEAR message. Bit
0 (Data Ready) is not cleared since it represents the
3478A's current status (the bit is cleared when the 3478A
outputs its reading). Bit 6 is the SRQ bit which can be
cleared by a Serial Poll or if the SRQ Mask is set to 00.
3-106. Power-On SRQ.
setting the Power-On SRQ switch to On (switch #3 on
the rear panel in the up position). When the feature is
enabled, the 3478A Requires Service (generates an
SRQ) each time power is cycled or a reset condition is
generated by the instrument (e.g. due to an instrument
failure or selecting the Self-Test).
3-107. Sending Data to the Display. Up to 12 ASCII
characters can be displayed at a time by the 3478A's
display. The legal characters are decimal 32 through 95
of the 128 ASCII characters. Only upper case letters
and numbers can be displayed.
generate characters which do not resemble the letters.
Commas, periods, and semicolons can go between
characters. The ASCII characters can be sent in two
different modes. The following paragraphs explain the
two modes.
3-108. In one display mode, the display is continuously
updated. This is enabled by program code "D2" (e.g.
"D23478A DMM" where "3478A DMM" is the message
displayed). In this mode, the annunciators continue to be
updated. If more than 12 characters are sent to the
display, the extra characters are ignored until a control
character is received. If the control character is different
than HT (Horizontal Tab), VT (Vertical Tab), LF (Line
Field), CR (Carriage Return), or FF (Form Feed), a
Syntax Error is generated. A "D2" code locks the display
until a "DI" (Selects Normal Display) is sent, a CLEAR
message is sent, an error condition occurs, or a front
panel button is pressed.
3-109. The other display mode is selected by sending
code "D3". This mode is the same as the previous
mode, except the display is not updated and all
annunciators are turned off.
remains on for about 10 minutes and then the display
goes blank. The display can be restored by sending any
of the display codes (DI, D2, or D3) or by pressing the
LOCAL button (if not disabled by the LOCAL LOCKOUT
Message).
3-110. Home Commands.
(when sent to the 3478A over the HP-IB) are used to set
the 3478A into a predefined operating state.
program code is "Hn", where n is the number which,
3-12
TM 11-6625-3071-14
(0 = Rear, 1 = Front)
This feature is enabled by
Lower case letters
The text on the display
The Home Commands
The