Keithley 2001 User Manual

IEEE-488 Reference
4-154
Formats :freq:thr:curr:lev <n>
:freq:thr:volt:lev <n>
Defaults Power-up Saved power-on setup
*RST 0 (volts and amps)
:SYSTem:PRESet 0 (volts and amps)
Query :LEVel? Query trigger level
:LEVel? DEFault Query *RST default trigger level
:LEVel? MINimum Query lowest allowable trigger level
:LEVel? MAXimum Query largest allowable trigger level
Short-form formats: :freq:thr:curr:lev?
:freq:thr:volt:lev? xxx
:freq:thr:volt:lev?
:freq:thr:volt:lev? xxx
where; xxx = def, min or max
Response messages: -0.6 to +0.6 (amps; current threshold)
-600 to +600 (volts; voltage threshold)
Description These commands are used to specify threshold trigger levels for the specified (current or volt-
age) input signal. An appropriate trigger level is necessary in order for the frequency counter to
operate properly. The instrument will only count cycles whose peak signal amplitude reaches
the programmed trigger level. For example, if you have the trigger set for 0.5mA, cycles whose
peak amplitude is less than 0.5mA will not be counted.
If using AC+DC coupling (see :COUPling), make sure that the threshold signal level accounts
for the DC bias level. For example, if a 10mA peak-to-peak input signal is riding on a 50mA DC
bias level, a threshold signal level of 55mA would be appropriate. Notice that the range of valid
parameter values depends on which threshold range is selected (see :RANGe). As a general rule,
the limit value can be up to +/- 60% of the programmed threshold range.
Programming example 10 OUTPUT 716; “:freq:thr:curr:rang .01; lev .005; lev?”
20 ENTER 716; A$
30 PRINT A$
40 END
Line 10 Selects the 10mA current threshold range, specifies a 5mA trigger level, and then
queries the trigger level.
Line 20 Addresses the Model 2001 to talk.
Line 30 Displays the trigger level (0.005).
:TTL
[:SENSe[1]]:FREQuency:THReshold:VOLTage:TTL Select TTL trigger level
Format :freq:thr:volt:ttl
Description This action command is used to configure the voltage threshold trigger level for a TTL input sig-
nal. After this command is sent, the 10V threshold voltage range will be selected and a threshold
trigger level of 0.8V will be established.

Keithley 2001 Specifications

General

Brand	Keithley
Model	2001
Category	Multimeter
Language	English