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Lab-Measurement-3.690
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/ Lab::Instrument::Lakeshore340

NAME

Lab::Instrument::Lakeshore340 - Lakeshore 340 temperature controller

VERSION

version 3.690

SYNOPSIS

use Lab::Measurement;
my $lake = Instrument('Lakeshore340', {
    connection_type => ...,
    gpib_address => ...
    });
    
my $temp = $lake->get_T({channel => 'C'});

$lake->set_T({value => 5.5, loop => 1});

DESCRIPTION

The Lab::Instrument::Lakeshore340 class implements an interface to the Lakeshore 340 AC Resistance Bridge.

For use in XPRESS temperature sweeps, see the example script examples/XPRESS/lakeshore340_sweep.pl.

METHODS

get_T

$t = $lake->get_T(<$channel>);

Reads temperature in Kelvin (only possible if temperature curve is available, otherwise returns zero).

$channel

CHANNEL is an optinal parameter to select the sensor channel (A/B/C/D) for the measurement. If not defined the default channel 'A' will be selected.

get_R

$t = $lake->get_R(<$channel>);

Reads resistance in Ohm.

$channel

CHANNEL is an optinal parameter to select the sensor channel (A/B/C/D) for the measurement. If not defined the default channel 'A' will be selected.

set_T

$sp = $lake->set_T($setpoint, <$loop>);

Set new temperature SETPOINT for temperature control loop $loop. Returns the new setpoint. If no parameters are given, the currently valid SETPOINT will be returned.

$setpoint

New temperature Setpoint.

$loop

Optional prameter to select the temperature control loop for which the new setting will be valid. If not defined the default value $loop = 1 will be selected. Possible values are '1' and '2'.

.

set_range

$heater_range = $lake->set_range($range);

Set the HEATER RANGE.

$range

RANGE can be 'OFF', 'LOW', 'MEDIUM', 'HIGH', 'GIANT' or 'MAX'.

.

set_input_curve

$lake->set_input_curve($channel, $curve);

Set for SENSOR CHANNEL $channel the resistance-to-temperatur CURVE with the internal storage number $curve.

$channel

CHANNEL selects the SENSOR CHANNEL and can be 'A' or 'B'.

$curve

CURVE reverse to one ov the internally stored resistance-to-temperatur CURVES and can be 0 .. 41.

.

set_PID

@PID = $lake->set_PID($P,$I,$D);

Set new values for the PID temperature control circuit.

$P

The PROPORTIONAL term, also called gain must have a value greater then zero for the control loop to operate. It's maximum value is 1000.

$I

The INTEGRAL term looks at error over time to build the integral contribution to the output. Values are 0.1 ... 1000.

$D

The DERIVATIVE term acts aon the change in error with time to make its contribution to the output. Values: 0 ... 200.

.

config_sweep

$lake->config_sweep($setpoint, $rate);

Predefine a temperature sweep.

$setpoint

Predefine the temperature target setpoint for a temperatue sweep. Values 0 .. 300 K.

$rate

Predefine sweep rate for a temperature sweep. Values 0.1 ... 100 K/minute.

.

trg

$lake->trg();

Start a predefined temperature sweep.

halt

$lake->halt();

Stop running temperature sweep.

active

$lake->active();

Returns 1 if a temperature sweep is running and 0 if not.

wait

$lake->wait();

Wait until the currently active temperature sweep has been finished.

id

$id=$sr780->id();

Returns the instruments ID string.

.

CAVEATS/BUGS

probably many

.

SEE ALSO

Lab::Instrument

COPYRIGHT AND LICENSE

This software is copyright (c) 2019 by the Lab::Measurement team; in detail:

Copyright 2013-2014  Christian Butschkow
          2016       Simon Reinhardt
          2017       Andreas K. Huettel, Simon Reinhardt
          2019       Simon Reinhardt

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.