Stanford Research Systems LDC500, Operation And Service Manual

Page: 49 / 141

2.4 Factory Default Settings 2 – 21
Item Value Notes
TEC Controller Settings T 25
◦
C TEC temperature setpoint
TE I 0 A TEC current setpoint
TE Ilim 2.25 A TEC module current limit
Tmax 50
◦
C Upper temperature limit for stage
Tmin 0
◦
C Lower temperature limit for stage
TE Vlim 8 V Maximum TEC operating voltage
TEC Controller Config Sensor type NTC auto NTC thermistor w
/
automatic excita-
tion current
Sensor model
β
–model Model for calculating temperature
from resistance
β
3800
◦
C Exponent factor for sensor model
R0 10 k
Ω
Resistance scale for sensor model
T0 25
◦
C Reference temperature for sensor
model
PID P
−
0
.
5 A
/
◦
C Proportional gain (temperature con-
trol)
PID I 0.36
/
second Integral gain
PID D 0.65 second Derivative gain
Auto tune step 0.225 A Step size for autotuning
CC
/
CT lock no CC
/
CT transitions allowed
Trip-o
ff
@ TE Ilim no Do not trip o
ff
when TEC current limit
is reached
Trip-o
ff
@ TE Vlim YES Trip o
ff
when TEC voltage limit is
reached
Trip-o
ff
@ Tmax YES Trip o
ff
when upper temperature limit
is reached
Trip-o
ff
@ Tmin YES Trip o
ff
when lower temperature limit
is reached
Trip-o
ff
@ fault YES Trip o
ff
when temperature sensor is
open, or wrong type, or illegal model
parameters
TEC Polarity Reversed NO TEC output current uses standard
(non-reversed) polarity.
Utility IP address 169.254.46.27 Should be reset for your local network
environment
IP netmask 255.255.0.0
Gateway 0.0.0.0 may need to be set for your network
GPIB address 2
Ethernet speed 100 Base-T may need to be changed for older net-
works
RS-232 baudrate 9600
Brightness 50% Alphanumeric display brightness
LDC500 Series Laser Diode Controllers