EMPX-H2 probe station specifications

Sample cooling assembly

Type:3-stage flow cryostat (sample + 2 radiation shields)
Radiation shielding:Partial inner radiation shield; second radiation shield with top viewport surrounds sample
Cooling source:Liquid helium (LHe) or liquid nitrogen (LN2)

Magnetic field

Magnet type:Electromagnet
Field orientation:Horizontal (parallel to the sample plane)
Field control:Hall probe installed in station for closed-loop control
Field capability:±6.0 kOe (±0.6 T)
Field homogeneity:0.6% over 10 mm diameter; 2.6% over 25 mm diameter
Landed probe tip movement: <5 µm full field ramp


Base temperature Control range Configuration
4.5 K5 K to 400 KUp to 4 probe arms installed
3.2 K3.3 K to 400 Kwith PS-LT 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)±20 mK±50 mK
<10 K±50 mK
10 K to 100 K±50 mK±100 mK
101 K to 250 K±50 mK±100 mK
251 K to 400 K±50 mK±100 mK


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

Cycle time (LHe):

3 h
Vacuum pump down:0.5 h
Station cooldown:1.25 h
Station warmup:1.25 h

Vibration at sample:

<300 nm standard


Maximum sample size:25.4 mm (1 in) diameter
Sample backside optical access:Not an option
Sample rotation:Optional 360° rotation stage (PS-360-EMPX)

Probing configurations

Maximum probes:4 (see orientation diagram)
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
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 liquid L helium; 5 liquid L nitrogen
Helium at 5 K:1 to 2 liquid L/h
Nitrogen at 80 K:<0.5 liquid L/h

2Assumes maximum number of probe arms installed

EMPX-HF probes are aligned at 30 degree angles

Station details

Temperature equipment

Sample stage sensor/heater power:CX-1050-CU-HT-1.4M/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/100 W
Probe arm:DT-670C-SD silicon diode (on one probe arm)/no active control
Electronics console:
Temperature controller:Model 336
Warm-up amplifier:Model 142
Gaussmeter:Model 475
Magnet power supply:Model 643
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-1.00-G-EM, 25.4 mm (1 in) maximum sample size, grounded

Station footprint:

914 mm (36 in) width × 660 mm (26 in) depth
(does not include console)

Vacuum chamber

Material:Electroless nickel-plated aluminum
Overall size:191 mm (7.5 in) × 340 mm (13.4 in) × 292 mm (11.5 in) tall
Chamber access:133.4 mm (5.25 in) × 243.2 mm (9.58 in) 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
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:59 mm (2.3 in) × 157 mm (6.2 in)
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 (EM):200/208, 220/230, 380, 400/415 VAC (±10%), 50/60 Hz
3-phase power (EM):5.5 kVA max 50/60 Hz
Cooling water power dissipation (EM):5 kW max, 50/60 Hz
Total system cooling water power dissipation:4.25 kW max, 50/60 Hz — see list of available recirculating chillers


All instruments CE marked


Back to the EMPX-H2 overview

Probing configurations

Vision system

Recirculating chillers