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HP 3421A Command Reference
FEL [<sdswe..z]
TOT [x]
CLF <u>
CFM [=]
FED
MET 1 1 value
EIT<:>[sds...z]
Measures frequency (F7) with a one-second gate time (G0) and § 1/2-digit
resolution. If no channel numbers are sent, the channel list is not changed, no
channels are opened or closed, and a software single trigger (T2) is executed.
If a channellist is sent, they are loaded, executed, and sent in the order given.
Totalizes events (F7) up to a maximum count of 65,535. If channel 'x' is sent,
all channels are opened before closing channel 'x'. The counter is zeroed, then
starts totalizing. When the HP 3421A is addressed to talk it will send out the
current subtotal without disrupting the counter.
Note that if a TRIGGER
command is received, the TOT is aborted and a frequency reading is taken.
Close single channel x'. The HP 3421A first identifies the type of channel at
x'. If the channel is an actuator (00, 01, 10, 11, 20, or 21 are possible
actuator numbers), the actuator is closed. If the channel is a digital output,
the output bit will be set.
If the channel is a multiplexer, all other
multiplexer channels will be opened before closing channel 'x'.
Close a pair of channels. The HP 3421A opens all multiplexer channels, then
closes channels x and x+10 MOD 30.
Open channel(s). If channel 'x' is not sent, the OPN command will open all
channels: digital outputs, actuators, and multiplexers. If 'x' is sent, that
channel 1s opened.
Reads the digital input byte from slot 1 and replies with a decimal number
from Oto 255. This decimal number represents the values of the bits that
were set.
Write the decimal value [ab]c to slot i. The value must be in the range 0 to
255.
Reads the digital input bits (up to 30 in the bit list) and sends O if the bit is
low or 1 if the bit is high.
Advanced Commands
Function, Command
All functions off,
DC Volts,
AC Volts,
Two Wire Ohms,
Four Wire Ohms,
Reference,
Temperature,
Frequency,
FO
Fi
F2
F3
Fa
F5
Fé
F7
Range Codes (RA1 = Autorange on, RAO = off)
R-1
RO
R1
R2
R3
R4
RS
R6
RT
#*
*
*
*
*
*
*
*
*
.3v
3vV
30V
300V
*
*
*
*
*
#
3V
30V
*
*
*
*
*»
*
*
*
*
300
3K
30K
300K
3M
30M
*
*
*
300
3K
30K
300K
3M
30M
The range 1s automatically set by the REF command
The range is automatically set by the TEM command
Gate times: G-1 = .1 sec., GO = 1 sec., G1 = 10 sec.
# indicates an invalid combination of function and range.
B-2
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