Keithley 2001 Operator's Manual page 352

IEEE-488 Reference
Description
Programming example
Parameters
Format
Defaults
Query
Description
Programming example
4-194
The :AZERo commands are used to control the auto-zero phase of each measurement. During a
normal reading conversion, the input signal is compared against a measured reference signal and
a measured zero signal to ensure an accurate measurement. When auto-zero is disabled, the zero
signal measurement is not performed, allowing the reading rate to be increased. However,
accuracy is compromised. The longer auto-zero is disabled, the more inaccurate the readings
become.
The :TYPE command is used to select auto-zero type. When SYNChronous auto-zero is en-
abled (see :STATe), the zero signal measurement will occur with every reading conversion.
When NORMal auto-zero is enabled, the zero signal measurement will occur every 200msec.
Normal auto-zero is a compromise between synchronous auto-zero and disabling auto-zero. It
will give you better speed than synchronous auto-zero and update zero at a regular interval.
10 OUTPUT 716; ":syst:azer:type sync; type?"
20 ENTER 716; A$
30 PRINT A$
40 END
Line 10 Two commands in this program message; the first selects synchronous auto-zero,
and the second queries the auto-zero type.
Line 20 Addresses the Model 2001 to talk.
Line 30 Displays auto-zero type (SYNC).
:STATe <b>
:SYSTem:AZERo:STATe <b>
<b> = 1 or ON
= 0 or OFF
:syst:azer:stat <b>
Power-up
*RST
:SYSTem:PRESet
:STATe? Query state of auto-zero
Short-form format: :syst:azer:stat?
Response message: 1 (on) or 0 (off)
This command is used to disable or enable auto-zero.
Before you can enable or disable auto-zero, the Model 2001 must first be in
the idle state. The Model 2001 can be placed in the idle state by first disabling continuous ini-
tiation (:INITiate:CONTinuous OFF), and then sending the :ABORt command. After sending
the :STATe command, readings can be re-started by sending :INITiate:CONTinuous ON or
:INITiate.
10 OUTPUT 716; ":init:cont off; :abor"
20 OUTPUT 716; ":syst:azer:stat off; stat?"
Control auto-zero
Enable auto-zero
Disable auto-zero
Saved power-on setup
ON
ON
2001-900-01 Rev. K / August 2010