CPX probe station specifications

Sample cooling assembly 

Type:Type: 1 + 3-stage split flow cryostat (sample + 3 radiation shields); dual exhaust ports with independent flow control of sample and shields
Radiation shielding:Inner 4 K (partial) radiation shield; main radiation shield with top viewport surrounds sample; outer second (partial) radiation shield
Cooling source:Liquid helium (LHe) or liquid nitrogen (LN2)

Magnetic field:

Ring magnet kit


Base temperature Control range Configuration
4.3 K4.4 K to 475 KUp to 6 probe arms installed
1.9 K2 K to 475 Kwith PS-LT option
1.6 K 1.65 K to 400 Kwith PS-VLT-CPX option
10 K10 K to 400 Kwith PS-LL-CPX option

1Base temperature assumes heat load for probes thermally anchored as listed in probing section

Control stability

Sample stage temperature Helium stability Nitrogen stability
Base temperature (no heater control)±15 mK±20 mK
<10 K±50 mK
10 K to 100 K±20 mK±50 mK
101 K to 250 K±15 mK±50 mK
251 K to 350 K±15 mK±100 mK
351 K to 475 K±50 mK±100 mK


Standard TPS-FRG PS-HV-CPX option
Pump down time30 min
(to reach <1 × 10-3 Torr)
10 min
(to reach <1 × 10-3 Torr)
Room temperature<5 × 10-4 Torr<5 × 10-6 Torr
Helium base temperature<1 × 10-5 Torr<5 × 10-7 Torr
Maximum temperature<5 × 10-3 Torr<5 × 10-7 Torr

Cycle time (LHe):

3 h
Vacuum pump down:0.5 h
Station cooldown:1.25 h
Station warmup:2 h
Load-lock sample exchange:1 h with PS-LL-CPX option

Vibration at sample

Standard PS-PVIS option
X axis<300 nm (11.8 µin)<30 nm (1.18 µin)
Y axis
Z axis


Maximum sample size:51 mm (2 in) diameter
25.4 mm (1 in) diameter with PS-VLT-CPX option
25.4 mm (1 in) diameter with PS-LL-CPX option
Sample backside optical access:Not an option
Sample rotation:±5° in-plane rotation

Probing configurations

Maximum probes:6
Probe arm sensor:Included for monitoring probe temperature
Cooled probe mounts:<20 K with sample at base temperature
Probe mount:Thermally anchored to sample stage or 4 K shield
Probe arm:Thermally anchored to radiation shield
DC/RF probes and DC/RF flexible probes:Electrical isolation >100 GΩ for low leakage measurements
Microwave probes:Frequency range DC up to 67 GHz for RF measurements
Fiber optic probes:Available for electro-optical measurements
Probe landing:All probes can land at single point in a 25.4 mm (1.00 in) diameter circle

Cryogen consumption2

Room to base temperature (total):10 to 15 liquid L helium; 4 to 5 liquid L nitrogen
Helium at 5 K:1 liquid L/h
Nitrogen at 80 K:<0.5 liquid L/h

2Assumes maximum number of probe arms installed

Station details

Temperature equipment

Sample stage sensor/heater power:DT-670-CU-HT calibrated silicon diode/50 W
(PS-VLT sensor optimized for <4 K)CX-1050-CU-HT-1.4M calibrated Cernox/50 W
4 K radiation shield sensor/heater power:DT-670C-CU silicon diode/100 W
Radiation shield sensor/heater power:DT-670C-CU silicon diode/100 W
2nd radiation shield sensor/heater power:DT-670C-CU silicon diode/50 W
Probe arm:DT-670C-SD silicon diode (on one probe arm)/no active control
Electronics console:
Temperature controllers:Two Model 336s
Helium transfer line:Large bore helium/nitrogen transfer line with flow control 12.7 mm (0.5 in) top port withdrawal

Included sample holder:

Removable SH-1.25-G, 31.8 mm (1.25 in) maximum sample size, grounded

Station footprint:

800 mm (31.5 in) width × 670 mm (26.4 in) depth
(does not include instrument console)

Vacuum chamber

Material:Electroless nickel-plated aluminum
Overall size:280 mm (11 in) outer diameter × 343 mm (13.5 in) tall
Chamber access:229 mm (9 in) diameter opening
Viewport:63.5 mm (2.50 in) diameter fused quartz
Viewing area:54.0 mm (2.13 in) diameter
Pump port:NW 40 with included vacuum isolation valve
Gauge port:NW 25 (two ports)
Gas port:0.25 in NPT with valve
Over-pressure safety:3.5 kPa (0.5 psi) pressure relief valve

Radiation shielding

Material:Electroless nickel-plated aluminum
Sample access:167 mm (6.6 in) diameter lid
Viewport:50 mm (1.97 in) diameter IR absorbing window
Viewing area:50 mm (1.97 in) diameter

Vision system


Included kits

Tool kit:Included tools for standard operation
Spares kit:Included kit for common consumable items
Probe starter kit:ZN50R-25-W (qty 2), ZN50R-25-BECU (qty 2), and ZN50R-CVT-25-W (qty 2) for training


1-phase voltage:100/120/220/240 VAC (+5%, -10%), 50/60 Hz
1-phase power: 2 kVA recommended
3-phase voltage:Not required
3-phase power:Not required
Cooling water:Not required


All instruments CE marked


Back to the CPX overview

Probing configurations

Vision system