| Inputs |
Two Multipurpose
Sensor Inputs |
| Type |
Front
panel select any supported sensor. |
| Measurement
method |
Ratiometric,
auto-balance AC bridge with digital lock-in detection. |
| Constant-Voltage
Excitation mode |
Constant-voltage
Sine wave with selections of 3.33mV, 1.0mV, 333uV, 100µV,
33µV, 10µV and
3.3µV RMS. Excitation
current range: 2.5mA to 82pA, frequency 7.5Hz. Excitation current
is
continuously variable so there are no 'range jumps'
in sensor self-heating. |
| Constant-Current
Excitation mode |
DC
current excitations available are 1mA, 100uA or 10uA. |
| Supported
Sensors |
Range |
Excitation |
Example Sensors |
| Ruthenium
Oxide |
50mK to 273K |
Constant-Voltage |
Scientific
Inst. RO-600, Lakeshore RX-102A |
| Cernox™ |
0.3 to 420K |
Constant-Voltage |
Lakeshore
CX-1020, CX-1080 |
| Germanium |
50mK to 100K |
Constant-Voltage |
Lakeshore
GR-200A |
| Carbon
Glass™ |
1.0K to 325K |
Constant-Voltage |
Lakeshore
CGR-1-500 |
| Thermistor |
70 to 325K |
Constant-Voltage |
Cryo-con
TM-50, Lakeshore TX-104-GB |
| Platinum
RTD |
14K to 1200K |
1mA or 100µA |
Cryo-con
CP-100, XP-100, XP-1K |
| Silicon
Diode |
1.4K to 475K |
10µA |
Cryo-con
S700, Scientific Inst. SI-410, Lakeshore DT-470 |
| GaAs
Diode |
25K to 475K |
10µA |
Scientific
Inst. GA-300, Lakeshore TG-120 |
| Rhodium-Iron |
30 to 800K |
10µA |
Oxford
PHZ 0002, Lakeshore RF-100 |
| Sample
Rate |
60Hz
per channel in all modes. |
| ADC resolution
|
24
Bits. |
| Resistance
Ranges vs.
Voltage Bias |
Voltage Bias |
Minimum Resistance
(Ohms) |
Maximum Resistance
(Ohms) |
|
|
3.33mV |
1.8 |
6.0M |
|
|
1.00mV |
0.6 |
6.0M |
|
|
333µV |
0.2 |
3.5M |
|
|
100µV |
0.06 |
1.0M |
|
|
33.3µV |
0.02 |
1.0M |
|
|
10µV |
0.006 |
800K |
|
| Sensor
Connection |
4-wire
differential. DB-9 receptacle |
| Measurement
Drift |
Less than 15ppm
per degree Celsius |
| Preamplifier
Noise |
17nV-per-root
Hz |
| Measurement
Accuracy |
<±0.02%
at TC = 0.5S. Increases with loop time-constant up to a maximum
accuracy that is
limited by preamplifier noise |
| Measurement
Filter |
0.5, 1, 2, 4, 8, 16, 32 and 64 Seconds |
| Calibration
Curves |
Built-in
curves for most industry standard sensors plus twelve user curves
with up to 200
entries each. Interpolation is performed using a Cubic
Spline algorithm for highest possible
accuracy. |
| CalGen™ |
Calibration
curve generator fits any Diode or resistor sensor curve at 1,
2 or 3
user specified temperature points |
|
|
| Control
Loops |
Two independent control loops for Dual-Loop operation |
| Control
Input |
Any
sensor input. |
| Loop Update
Rate |
10Hz
per loop. |
| Control Type |
PID
table, Enhanced PID, Ramp or Manual |
| Autotune
|
Autotuning
of both control loops. Minimum bandwidth PID loop implementation.
|
| PID Tables
|
Six
user PID tables available for storage of Set-point vs. PID and heater
range. Up to 16
entries/table. |
| Set-point
Accuracy |
Six+
significant digits. |
| Fault Monitors
|
Control
loops are disconnected upon detection of a control sensor fault
or excessive internal
temperature. |
Over Temperature
Disconnect |
Heater
may be relay disconnected from user equipment when a specified temperature
is
exceeded on any selected input. |
| Loop #1
|
Short-circuit
protected linear current source. Maximum compliance is 50V into
50 Ohms
or 25V into 25 Ohms. |
| Type |
Four
output ranges of 1.0A, 0.33A, 0.10A and 0.033A full-scale, which
correspond to 50W,
5.0W, 0.5W and 0.05W when used with
a 50 Ohm load OR 25W, 2.5W, 0.25W and 0.025W
when
used with a 25 Ohm load. |
| Load Resistance |
25
or 50 Ohms via front panel selection. Heaters down to 10 Ohms can
be used with the 25
Ohm range. |
| Minimum
Load |
10
Ohms in the 25 Ohm setting, 40 Ohms in the 50 Ohm setting. |
| Digital
Resolution |
0.0015%
of full-scale. Range is significantly extended through the use of
signal processing
techniques. |
| Readbacks |
Independent
circuits read back heater output power and heatsink temperature. |
| Loop
#2 |
Short-circuit
protected linear current source. |
| Type |
Short
circuit protected linear 20mA current source with a compliance of
20V. May be connected
directly to 20mA current loop process
control devices, or may be used directly as a 0.4Watt
heater output. |
| Load
Resistance |
100
Ohms minimum |
| Digital
Resolution |
0.0015%
of full-scale. Range is significantly extended through the use of
signal processing
techniques. |
|
|
| User
Interface |
|
| Display
Type |
21 x 8 character
plus graphics LCD with LED backlight |
| Inputs
Displayed |
Four |
| Keypad |
Sealed
Silicon Rubber. |
| Temperature
Display |
Six
significant digits, autoranged. Units are: K, C, F, Volts and Ohms |
| Display
Update Rate |
0.5
Seconds |
| Display
Resolution |
User
selectable to seven significant digits |
|
|
| Remote
Interfaces |
USB,
IEEE-488 (GPIB), RS-232 |
| Isolation |
Remote interfaces are electrically isolated to prevent ground loops |
| USB |
Universal
Serial Bus V2.0 compliant, full speed 12Mbps. Connector: USB Type
B |
| RS-232 |
Serial
port is an RS-232 standard null modem. Rates are 300, 1200, 4800,
9600, 19,200
and 38,400 Baud. Connector: DB-9 Male. |
| IEEE-488
(GPIB) |
Full
IEEE-488.2 compliant |
| Language |
Remote
interface language is IEEE SCPI compliant. National Instruments
LabVIEW™ drivers available for all interfaces |
| LabVIEW
Drivers |
Available
for all interfaces, including the USB |
|
|
|
|
| Status
Outputs |
|
| Audible
Alarm |
Internal. Asserted on programmed high or low temperature setpoints |
| Visual |
Three front panel LEDs indicate control mode, remote interface status
and alarm condition. |
| Remote
Interface |
Sensor fault, Heater fault and alarm conditions are reported over
the remote interfaces.
The IEEE-488 interface reports
via the Status Byte and SRQ. The USB reports by using an
interrupt packet. |
|
|
|
|
|
