LDT
5900
SeriesPrecision
Temperature
Controller

Specifications

Product Features
LDT-5948

LDT-5980

10kΩ to 600kΩ±0.05% ±5.0Ω
0.001kΩ

10kΩ to 600kΩ±0.05% ±5.0Ω
0.001kΩ1kΩ to 60kΩ
±0.05% ±5.0Ω
0.001kΩ1kΩ to 60kΩ
±0.05% ±5.0Ω
0.001kΩ10Ω to 6kΩ±0.08% ±0.06Ω
0.001kΩ

10 Ω to 6kΩ±0.08% ±0.06Ω
0.001kΩ-12.000 to 12.000V
1mV
±10mV

-12.000 to 12.000V
1mV
±10mV

Pseudo AC
±10mA
±1%

Pseudo AC
±10mA
±1%

High power output up to
120W (LDT-5980)

MEASUREMENT
Thermistor Resistance
10µA Setting
Range:
Accuracy:
Resolution:9
100µA Setting
Range:
Accuracy:
Resolution:91mA Setting
Range:
Accuracy:
Resolution:9
Voltage Measurement
Range:
Accuracy:
Resolution:
AC Resistance Measurement
Waveform:
Amplitude:
Accuracy:

Precision setpoint resolutionof ±0.001°C with long term
temperature stability of
0.005°C
Fully programmable PID
control loop
Four-wire voltage andsensor measurements
Auto-tune mode forindependent system tuning

SYNCHRONIZATION
Trigger In
Type:
Trigger Out
Type:
Delay (Programmable):
Jitter:Resolution:

TTL; edge-triggered

TTL; edge-triggered

TTL; level-triggered, active high
0 to 60,000ms
5ns
0.001s

TTL; level-triggered, active high
0 to 60,000ms
5ns
0.001sIndependent heating andcooling current limits
GPIB/IEEE488 and RS-232
Interfaces

GENERAL
Output Connectors
TEC I/O:
GPIB:
RS-232:
Trigger-In:
Trigger-Out:
Power Requirements:
Size:
Weight:Ambient Temperature Range
Operating:Storage:
Humidity:
Warm-up:
EMC:
Safety:Female 25 pin D-sub
IEEE-488
Female 9 pin D-sub
BNC
BNC
90-260 VAC @ 50-60Hz
3.5"x7.3"x12"10.0lbs (4.5kg)

Female 25 pin D-sub
IEEE-488
Female 9 pin D-sub
BNC
BNC
90-260 VAC @ 50-60Hz
3.5"x7.3"x12"10.0lbs (4.5kg)

10 to 40°C
-40 to 70°C
85%, relative, non-condensing

10 to 40°C
-40 to70°C
85%, relative, non-condensing

One (1) hour to rated accurancy
98/336/EEC (CE requirements)
EN 60950

One (1) hour to rated accurancy
98/336/EEC (CE requirements)
EN 60950

The LDT-5900 Series Temperature Controllers deliverindustry-leading precision, high power temperature control for
laser diodes and fiber optic components. These controllers
combine a fully adjustable PID control loop with digital
PWM output current, ensuring fast, efficient, and precise
temperature control from -50°C to +250°C. The LDT-5900
Series supports thermistor, IC and platinum resistive (RTD)
sensors, selectable from the front panel or via GPIB interface,giving you maximum flexibility during system design and test.
The LDT-5948 Precision Temperature Controller is ideal forinternal TE control of laser diodes, with available output powerof 60W. The LDT-5980 High Power Temperature Controller
delivers 120W of power for external case control in L-I-V
test applications and where wide-range test temperatures
are required. Additional features like four-wire voltage andsensor measurements and an AC resistance measurement
make these instruments perfect for characterizing TE modules
during laser module development, testing, or assembly.
Input and output triggers, standard GPIB control, and anauto-tune algorithm all work to accelerate and simplify test
automation.

NOTES
1 All values relate to a one-hour warm-up period.
2 Software limits of range. Actual range possible depends on the physical load, thermistor type, and TEC module used.
3 Accuracy figures are setpoint referenced and represent the uncertainty that the 5948/5980 adds to the measurement. This figure does not include the sensor
uncertainties that can add up to 2°C. Accuracy figures are quoted for a typical 10kΩ thermistor and 100µA current setting for -5°C to 50°C. Both resolution andaccuracy are dependent upon the user-defined configuration of the instrument.
4 Into a 0.1 to 2.5Ω load.
5 Temperature stability measurements made at 25°C with a 10kΩ thermistor on the 100µA setting. The number is derived from P-P deviation from the average over themeasurement period.
6 Measured over the full DC current range into a 1Ω load.
7 P=Proportional, I=Integral, D=Deriviative. Software programmable terms through the front panel or GPIB.
8 Thermistor sensing current range software selectable through the front panel or GPIB.
9 Higher resolution can be obtained through GPIB; <0.1Ω with 1 µA thermistor current and <0.01Ω with 100 µA thermistor current.
In keeping with our commitment to continuing improvement, ILX Lightwave reserves the right to change specifications without notice or liability for these changes.

ORDERING INFORMATION
LDT-5948
LDT-5980
RM-139RM-140CC-591H
CC-595S

60W Precision Temperature Controller
120W High Power Temperature Controller
Single Rack Mount Kit (5900/3220)
Dual Rack Mount Kit (5900/3220)
5900 10A TE Cable, unterminated
5A TE/LDM Cable, terminatedTS-510TS-520TS-521TS-523TS-525TS-530TS-540Calibrated 10kΩ Thermistor
Uncalibrated 10kΩ Thermistor
Uncalibrated 5kΩ Thermistor
Uncalibrated 20kΩ Thermistor
Uncalibrated 100kΩ Thermistor
Uncalibrated AD590LH IC Temperature Sensor
Uncalibrated LM335AH IC Temperature Sensor

Precision high power temperature control
for laser diode and component test.

For information call
P.O. Box 6310, Bozeman, MT 59771 • FAX: 406-586-9405

1-800-459-9459

www.ilxlightwave.com

International Inquiries: 406-556-2481
email: sales@ilxlightwave.com

REV02.032906

LDT
5900
SeriesPrecision
Temperature
Controller

LDT
5900
SeriesPrecision
Temperature
Controller

The LDT-5900 Series Temperature Controllers provide
the finest balance of features for today’s temperature
control needs in laser diode and component testing.
In addition to wide temperature control range anduncompromising stability, these instruments combine
a fully digital PID feedback loop with a precision 24bit measurement system for the utmost capability
in temperature control and measurement. Control
and display temperature from -50°C to 250°C
while delivering a low-noise, bipolar current (up to10A) to the thermo-electric module. This uniquetemperature control topology offers fast settling time
and temperature stability better than 0.005°C - ideal
for laser diode applications requiring highly stablewavelength and optical power.

More power for fastertemperature settling
The LDT-5980 provides 120W of output power for
production applications that require fast temperatureswings over a wide temperature range. The LDT5980, with its high voltage and current output, isdesigned specifically to drive the TECs used in theseapplications. Temperature setpoint resolution of
0.001°C gives you the ability to control to the exact
temperature your application requires, and the PID
control loop minimizes overshoot resulting in fastertemperature settling times.

Precision temperature control fortoday’s laser diodes
The LDT-5948 employs 24-bit control technology
allowing you to set temperature with 0.001°C resolution
with a measurement accuracy of 0.005°C. Precise
control reduces temperature effects on wavelength due
to changes in physical dimensions of the laser cavity.
The LDT-5948 is ideal for temperature controlling
DWDM signal source DFB lasers to achieve finewavelength tuning.

Uncompromising thermal stability
The LDT-5900 Series lets you easily control thetemperature of your laser diode in one of fourmodes: (1) Constant Temperature (2) ConstantSensor (3) Constant Current or (4) Constant Voltage.
Temperature stabilities of 0.005°C ensure device
performance and highly reliable test measurements.
With 0.005°C stability the LDT-5900 Series are ideal
for R&D applications, eliminating mode hopping andsignificantly reducing RMS noise.

Auto-tune function saves you effort
PID control loops provide unequaled temperaturesettling and stability performance but can be difficult
and time consuming to optimize. Our new auto-tune
function saves you effort by automatically determining
PID control constants for your particular thermal load.
If you change the load, you simply run the auto-tune
again and let the LDT-5900 Series do the work of
calculating the new control constants.

A choice of sensors for yourapplication
In addition to a broad range of thermistors and
RTDs, the LDT-5900 Series can accomodate IC
temperature sensors for control feedback. By
using the appropriate equation for the selected
temperature sensor and the applicable calibration
constants, residual errors of less than 0.005°C
can be realized over wide temperature ranges.
Sensor constants are easily entered via the front panel
or GPIB.

Control and measurement
for complex testingIn addition to precision temperature control, the LDT5900 Series provides four-wire voltage and sensor
measurement for the most accurate characterizationof laser diode module power consumption and reliablemeasurements. Independent heating and coolingcurrent limits help achieve the fastest settling times,
while protecting your device under all instrument
modes. If your application requires checking the
integrity of the TE device before and after installation
into a module or device, there is no need for a separate
instrument. The LDT-5900 Series provides an AC
resistance measurement mode that outputs a low level
AC current to the device under test and calculates its
corresponding resistance.

Automated temperature control
for functional test systems
These LDT-5900 Series come standard with a highspeed GPIB remote interface as well as RS-232
serial communication capability. For quick instrument
response without a command program, a TTL trigger-infunction steps the instrument through a preprogrammed
series of temperature setpoints. A trigger-out signal
indicates when the set point has been reached.

Designed for precision temperature control
and systems capability.
Put our expertise to work for you
In keeping with ILX tradition, the LDT-5900 Series
Temperature Controllers deliver the finest balance offeatures at the right price, all backed by ILX Lightwave’s
unmatched service and applications support. ILX
Lightwave is a recognized world leader in laser diodeinstruments and test systems. Our products arerenowned for their reliability, quality, value, and strong
after-sales support.

Precision
Temperature
Controller

Specifications
LDT-5948

LDT-5980-50oC to +250.000°C-50oC to +150.000°C-50oC to +199.999°C-50oC to +250.000°C-50oC to +150.000°C-50oC to +199.999°C±0.005°C±0.03A±0.05V (typical)±0.01°C±0.03A±0.05V (typical)

0.001oC
0.001A
0.001V±0.005°C
Bidirectional current source±12V DC-5.000 to 5.000A
60W
15mA rms (typical)

0.001oC
0.001A
0.001V±0.005°C
Bidirectional current source±12V DC-10.000 to 10.000A
120W
15mA rms (typical)-5 to 5A
±0.050A
Software PID Loop
0 to 9999.999
0 to 999.999
0 to 999.999-10 to 10A±0.050A
Software PID Loop
0 to 9999.999
0 to 999.999
0 to 999.999

NTC (2-wire)
Platinum 100Ω/1000Ω

NTC (2-wire)
Platinum 100Ω/1000Ω

Voltage output, 5mV/°C to 14mV/°C
Current output, 1µA/°K
10µA/100µA/1mA

Voltage output, 5mV/°C to 14mV/°C
Current output, 1µA/°K
10µA/100µA/1mA

10kΩ to 600kΩ
1kΩ to 60kΩ
10Ω to 6kΩ
IC-I=9V, IC-V=1 mA, RTD=1mA

10kΩ to 600kΩ
1kΩ to 60kΩ
10Ω to 6kΩ
IC-I=9V, IC-V=1mA, RTD=1mA

Steinhart-Hart, 3 constants
Offset/slope
Ro, A, B, C

Steinhart-Hart, 3 constants
Offset/slope
Ro, A, B, C

TEMPERATURE CONTROL OUPUT1
Temperature Control Range2
Thermistor Sensor:
IC Sensor:
RTD:
Setpoint Accuracy3
T Mode:ITE Mode:
VTE Mode:4
Setpoint Resolution
T Mode:ITE Mode:
VTE Mode:
Temperature Stability (24 hours):5
Output Type:
Compliance Voltage:
Output Current Range:
Maximum Output Power:
Current Noise and Ripple:6
Current Limit
Range:
Accuracy:
Control Algorithm:7
Proportional Term:
Integral Term:
Derivative Term:

TEMPERATURE SENSOR
Types
Thermistor:
RTD Sensor:
IC Sensor
IC-V (LM-335):
IC-I (AD-590):
Thermistor Biasing Current:8
Useable Thermistor/RTD Range
10µA:
100µA:
1mA:
Sensor Bias:
User Sensor Calibration
Thermistor:
IC Sensors:
RTD:

LDT
5900
Series

LDT
5900
SeriesPrecision
Temperature
Controller

The LDT-5900 Series Temperature Controllers provide
the finest balance of features for today’s temperature
control needs in laser diode and component testing.
In addition to wide temperature control range anduncompromising stability, these instruments combine
a fully digital PID feedback loop with a precision 24bit measurement system for the utmost capability
in temperature control and measurement. Control
and display temperature from -50°C to 250°C
while delivering a low-noise, bipolar current (up to10A) to the thermo-electric module. This uniquetemperature control topology offers fast settling time
and temperature stability better than 0.005°C - ideal
for laser diode applications requiring highly stablewavelength and optical power.

More power for fastertemperature settling
The LDT-5980 provides 120W of output power for
production applications that require fast temperatureswings over a wide temperature range. The LDT5980, with its high voltage and current output, isdesigned specifically to drive the TECs used in theseapplications. Temperature setpoint resolution of
0.001°C gives you the ability to control to the exact
temperature your application requires, and the PID
control loop minimizes overshoot resulting in fastertemperature settling times.

Precision temperature control fortoday’s laser diodes
The LDT-5948 employs 24-bit control technology
allowing you to set temperature with 0.001°C resolution
with a measurement accuracy of 0.005°C. Precise
control reduces temperature effects on wavelength due
to changes in physical dimensions of the laser cavity.
The LDT-5948 is ideal for temperature controlling
DWDM signal source DFB lasers to achieve finewavelength tuning.

Uncompromising thermal stability
The LDT-5900 Series lets you easily control thetemperature of your laser diode in one of fourmodes: (1) Constant Temperature (2) ConstantSensor (3) Constant Current or (4) Constant Voltage.
Temperature stabilities of 0.005°C ensure device
performance and highly reliable test measurements.
With 0.005°C stability the LDT-5900 Series are ideal
for R&D applications, eliminating mode hopping andsignificantly reducing RMS noise.

Auto-tune function saves you effort
PID control loops provide unequaled temperaturesettling and stability performance but can be difficult
and time consuming to optimize. Our new auto-tune
function saves you effort by automatically determining
PID control constants for your particular thermal load.
If you change the load, you simply run the auto-tune
again and let the LDT-5900 Series do the work of
calculating the new control constants.

A choice of sensors for yourapplication
In addition to a broad range of thermistors and
RTDs, the LDT-5900 Series can accomodate IC
temperature sensors for control feedback. By
using the appropriate equation for the selected
temperature sensor and the applicable calibration
constants, residual errors of less than 0.005°C
can be realized over wide temperature ranges.
Sensor constants are easily entered via the front panel
or GPIB.

Control and measurement
for complex testingIn addition to precision temperature control, the LDT5900 Series provides four-wire voltage and sensor
measurement for the most accurate characterizationof laser diode module power consumption and reliablemeasurements. Independent heating and coolingcurrent limits help achieve the fastest settling times,
while protecting your device under all instrument
modes. If your application requires checking the
integrity of the TE device before and after installation
into a module or device, there is no need for a separate
instrument. The LDT-5900 Series provides an AC
resistance measurement mode that outputs a low level
AC current to the device under test and calculates its
corresponding resistance.

Automated temperature control
for functional test systems
These LDT-5900 Series come standard with a highspeed GPIB remote interface as well as RS-232
serial communication capability. For quick instrument
response without a command program, a TTL trigger-infunction steps the instrument through a preprogrammed
series of temperature setpoints. A trigger-out signal
indicates when the set point has been reached.

Designed for precision temperature control
and systems capability.
Put our expertise to work for you
In keeping with ILX tradition, the LDT-5900 Series
Temperature Controllers deliver the finest balance offeatures at the right price, all backed by ILX Lightwave’s
unmatched service and applications support. ILX
Lightwave is a recognized world leader in laser diodeinstruments and test systems. Our products arerenowned for their reliability, quality, value, and strong
after-sales support.

Precision
Temperature
Controller

Specifications
LDT-5948

LDT-5980-50oC to +250.000°C-50oC to +150.000°C-50oC to +199.999°C-50oC to +250.000°C-50oC to +150.000°C-50oC to +199.999°C±0.005°C±0.03A±0.05V (typical)±0.01°C±0.03A±0.05V (typical)

0.001oC
0.001A
0.001V±0.005°C
Bidirectional current source±12V DC-5.000 to 5.000A
60W
15mA rms (typical)

0.001oC
0.001A
0.001V±0.005°C
Bidirectional current source±12V DC-10.000 to 10.000A
120W
15mA rms (typical)-5 to 5A
±0.050A
Software PID Loop
0 to 9999.999
0 to 999.999
0 to 999.999-10 to 10A±0.050A
Software PID Loop
0 to 9999.999
0 to 999.999
0 to 999.999

NTC (2-wire)
Platinum 100Ω/1000Ω

NTC (2-wire)
Platinum 100Ω/1000Ω

Voltage output, 5mV/°C to 14mV/°C
Current output, 1µA/°K
10µA/100µA/1mA

Voltage output, 5mV/°C to 14mV/°C
Current output, 1µA/°K
10µA/100µA/1mA

10kΩ to 600kΩ
1kΩ to 60kΩ
10Ω to 6kΩ
IC-I=9V, IC-V=1 mA, RTD=1mA

10kΩ to 600kΩ
1kΩ to 60kΩ
10Ω to 6kΩ
IC-I=9V, IC-V=1mA, RTD=1mA

Steinhart-Hart, 3 constants
Offset/slope
Ro, A, B, C

Steinhart-Hart, 3 constants
Offset/slope
Ro, A, B, C

TEMPERATURE CONTROL OUPUT1
Temperature Control Range2
Thermistor Sensor:
IC Sensor:
RTD:
Setpoint Accuracy3
T Mode:ITE Mode:
VTE Mode:4
Setpoint Resolution
T Mode:ITE Mode:
VTE Mode:
Temperature Stability (24 hours):5
Output Type:
Compliance Voltage:
Output Current Range:
Maximum Output Power:
Current Noise and Ripple:6
Current Limit
Range:
Accuracy:
Control Algorithm:7
Proportional Term:
Integral Term:
Derivative Term:

TEMPERATURE SENSOR
Types
Thermistor:
RTD Sensor:
IC Sensor
IC-V (LM-335):
IC-I (AD-590):
Thermistor Biasing Current:8
Useable Thermistor/RTD Range
10µA:
100µA:
1mA:
Sensor Bias:
User Sensor Calibration
Thermistor:
IC Sensors:
RTD:

LDT
5900
Series

LDT
5900
SeriesPrecision
Temperature
Controller

Specifications

Product Features
LDT-5948

LDT-5980

10kΩ to 600kΩ±0.05% ±5.0Ω
0.001kΩ

10kΩ to 600kΩ±0.05% ±5.0Ω
0.001kΩ1kΩ to 60kΩ
±0.05% ±5.0Ω
0.001kΩ1kΩ to 60kΩ
±0.05% ±5.0Ω
0.001kΩ10Ω to 6kΩ±0.08% ±0.06Ω
0.001kΩ

10 Ω to 6kΩ±0.08% ±0.06Ω
0.001kΩ-12.000 to 12.000V
1mV
±10mV

-12.000 to 12.000V
1mV
±10mV

Pseudo AC
±10mA
±1%

Pseudo AC
±10mA
±1%

High power output up to
120W (LDT-5980)

MEASUREMENT
Thermistor Resistance
10µA Setting
Range:
Accuracy:
Resolution:9
100µA Setting
Range:
Accuracy:
Resolution:91mA Setting
Range:
Accuracy:
Resolution:9
Voltage Measurement
Range:
Accuracy:
Resolution:
AC Resistance Measurement
Waveform:
Amplitude:
Accuracy:

Precision setpoint resolutionof ±0.001°C with long term
temperature stability of
0.005°C
Fully programmable PID
control loop
Four-wire voltage andsensor measurements
Auto-tune mode forindependent system tuning

SYNCHRONIZATION
Trigger In
Type:
Trigger Out
Type:
Delay (Programmable):
Jitter:Resolution:

TTL; edge-triggered

TTL; edge-triggered

TTL; level-triggered, active high
0 to 60,000ms
5ns
0.001s

TTL; level-triggered, active high
0 to 60,000ms
5ns
0.001sIndependent heating andcooling current limits
GPIB/IEEE488 and RS-232
Interfaces

GENERAL
Output Connectors
TEC I/O:
GPIB:
RS-232:
Trigger-In:
Trigger-Out:
Power Requirements:
Size:
Weight:Ambient Temperature Range
Operating:Storage:
Humidity:
Warm-up:
EMC:
Safety:Female 25 pin D-sub
IEEE-488
Female 9 pin D-sub
BNC
BNC
90-260 VAC @ 50-60Hz
3.5"x7.3"x12"10.0lbs (4.5kg)

Female 25 pin D-sub
IEEE-488
Female 9 pin D-sub
BNC
BNC
90-260 VAC @ 50-60Hz
3.5"x7.3"x12"10.0lbs (4.5kg)

10 to 40°C
-40 to 70°C
85%, relative, non-condensing

10 to 40°C
-40 to70°C
85%, relative, non-condensing

One (1) hour to rated accurancy
98/336/EEC (CE requirements)
EN 60950

One (1) hour to rated accurancy
98/336/EEC (CE requirements)
EN 60950

The LDT-5900 Series Temperature Controllers deliverindustry-leading precision, high power temperature control for
laser diodes and fiber optic components. These controllers
combine a fully adjustable PID control loop with digital
PWM output current, ensuring fast, efficient, and precise
temperature control from -50°C to +250°C. The LDT-5900
Series supports thermistor, IC and platinum resistive (RTD)
sensors, selectable from the front panel or via GPIB interface,giving you maximum flexibility during system design and test.
The LDT-5948 Precision Temperature Controller is ideal forinternal TE control of laser diodes, with available output powerof 60W. The LDT-5980 High Power Temperature Controller
delivers 120W of power for external case control in L-I-V
test applications and where wide-range test temperatures
are required. Additional features like four-wire voltage andsensor measurements and an AC resistance measurement
make these instruments perfect for characterizing TE modules
during laser module development, testing, or assembly.
Input and output triggers, standard GPIB control, and anauto-tune algorithm all work to accelerate and simplify test
automation.

NOTES
1 All values relate to a one-hour warm-up period.
2 Software limits of range. Actual range possible depends on the physical load, thermistor type, and TEC module used.
3 Accuracy figures are setpoint referenced and represent the uncertainty that the 5948/5980 adds to the measurement. This figure does not include the sensor
uncertainties that can add up to 2°C. Accuracy figures are quoted for a typical 10kΩ thermistor and 100µA current setting for -5°C to 50°C. Both resolution andaccuracy are dependent upon the user-defined configuration of the instrument.
4 Into a 0.1 to 2.5Ω load.
5 Temperature stability measurements made at 25°C with a 10kΩ thermistor on the 100µA setting. The number is derived from P-P deviation from the average over themeasurement period.
6 Measured over the full DC current range into a 1Ω load.
7 P=Proportional, I=Integral, D=Deriviative. Software programmable terms through the front panel or GPIB.
8 Thermistor sensing current range software selectable through the front panel or GPIB.
9 Higher resolution can be obtained through GPIB; <0.1Ω with 1 µA thermistor current and <0.01Ω with 100 µA thermistor current.
In keeping with our commitment to continuing improvement, ILX Lightwave reserves the right to change specifications without notice or liability for these changes.

ORDERING INFORMATION
LDT-5948
LDT-5980
RM-139RM-140CC-591H
CC-595S

60W Precision Temperature Controller
120W High Power Temperature Controller
Single Rack Mount Kit (5900/3220)
Dual Rack Mount Kit (5900/3220)
5900 10A TE Cable, unterminated
5A TE/LDM Cable, terminatedTS-510TS-520TS-521TS-523TS-525TS-530TS-540Calibrated 10kΩ Thermistor
Uncalibrated 10kΩ Thermistor
Uncalibrated 5kΩ Thermistor
Uncalibrated 20kΩ Thermistor
Uncalibrated 100kΩ Thermistor
Uncalibrated AD590LH IC Temperature Sensor
Uncalibrated LM335AH IC Temperature Sensor

Precision high power temperature control
for laser diode and component test.

For information call
P.O. Box 6310, Bozeman, MT 59771 • FAX: 406-586-9405

1-800-459-9459

www.ilxlightwave.com

International Inquiries: 406-556-2481
email: sales@ilxlightwave.com

REV02.032906

LDT
5900
SeriesPrecision
Temperature
Controller