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Interchangable Rox™ Specifications

General

Standard curve 102 and 202: 0.05 K to 40 K; 103: 1.4 K to 40 K

Recommended excitation¹RX-102 and RX-202 : 20 µV (0.05 K to 0.1 K); 63 µV (0.1 K to 1.2 K); 10 mV or less for T >1 K. RX-103: 10 mV or less for T > 1 K.

Dissipation at recommended excitation
102 and 202: 7.5 × 10^–8 W at 4.2 K;
103: 3.2 × 10^–9 W at 1.4 K, 5.5 × 10^–9 W at 4.2 K, 9.6 × 10^–9 W at 77 K

Thermal response time 0.5 s at 4.2 K, 2.5 s at 77 K

Radiation effects Recommended — more information

Magnetic field Recommended — more information

Reproducibility² ±15 mK

Soldering standard J-STD-001 Class 2

¹Recommended excitation for T < 1 K based on Lake Shore calibration procedures using an AC resistance bridge—for more information refer to Appendix D and Appendix E

²Short-term reproducibility data is obtained by subjecting sensor to repeated thermal shocks from 305 K to 4.2 K

Range of use

	Minimum limit	Maximum limit
RX-102A-AA	0.05 K	40 K
RX-202A-AA	0.05 K	40 K
RX-103A-AA	1.4 K	40 K

Calibrated accuracy³

	RX-102A-AA	RX-202A-AA	RX-103A-AA
20 mK	—	—	—
50 mK	—	—	—
1.4 K	±16 mK	±16 mK	±16 mK
4.2 K	±16 mK	±16 mK	±17 mK
10 K	±18 mK	±18 mK	±22 mK

³[(Calibration uncertainty)² + (reproducibility)²] ^0.5 for more information see Appendices B, D, and E

Long-term stability

	RX-102A-AA	RX-202A-AA	RX-103A-AA
4.2 K	±30 mK	±50 mK	±15 mK

Typical magnetic field-dependent temperature errors ΔT/T (%) at B (magnetic induction)

Rox™ 102A
T (K)	2.5 T	8 T	14 T	19 T
2	-1.4	-7.9	-13	-17
3	-1.5	-7	-14	-18
4	-0.56	-6.7	-14	-18
8	-1.3	-6.1	-13	-21
16	-0.40	-3.4	-9.6	-16
23	-0.31	-2.2	-6.2	-11

Rox™ 202A
T (K)	2.5 T	8 T	14 T	19 T
2	-0.13	-2.2	-3.9	-5.2
3	0.18	-0.68	-2.7	-3.7
4	0.77	0.046	-1.8	-3.2
8	-0.023	0.16	-0.65	-3.0
16	0.03	0.16	-0.48	-1.5
23	-0.05	-0.08	-0.39	-0.92

Rox™ 103A
T (K)	2.5 T	8 T	14 T	19 T
2	0.58	1.5	2.2	2.6
3	0.44	1.1	1.7	2.0
4	0.27	0.95	1.4	1.7
8	0.11	0.49	0.71	0.80
16	0.018	0.076	0.089	0.040
23	0.0051	0.0058	-0.0060	-0.095

Accuracy: interchangeability

	RX-102A-AA-M, matched	RX-102A-AA, unmatched	RX-202A-AA-M, matched	RX-202A-AA, unmatched	RX-103A-AA-M, matched	RX-103A-AA, unmatched
0.05 K	±5 mK	±10 mK	±10 mK	±15 mK	—	—
0.3 K	±15 mK	±20 mK	±20 mK	±25 mK	—	—
0.5 K	±20 mK	±25 mK	±25 mK	±30 mK	—	—
1.4 K	±25 mK	±50 mK	±50 mK	±100 mK	±50 mK	±150 mK
4.2 K	±75 mK	±125 mK	±150 mK	±250 mK	±100 mK	±400 mK
20 K	±500 mK	±1.25 K	±1 K	±2.5 K	±700 mK	±2 K
40 K	±1.5 K	±4 K	±2 K	±5 K	±1.5 K	±4 K

Temperature response data table (typical)

	102A			202A			103A
	R(Ω)	dR/dT (Ω/K)	(T/R)· (dR/dT)	R(Ω)	dR/dT (Ω/K)	(T/R)· (dR/dT)	R(Ω)	dR/dT (Ω/K)	(T/R)· (dR/dT)
0.05 K	63765	-2888654	-2.27	69191	-3186379	-2.3	—	—	—
0.1 K	19400	-266199	-1.37	21927	-256913	-1.17	—	—	—
0.3 K	5615	-16647	-0.89	8079	-18420	-0.68	—	—	—
1.4 K	2005	-667	-0.47	3820	-879	-0.32	30745	-13571	-0.62
4.2 K	1370	-80.4	-0.25	2929	-124	-0.18	18149	-1559	-0.36
10 K	1167	-15.2	-0.13	2582	-31.6	-0.12	14083	-337	-0.24
20 K	1089	-3.96	-0.07	2389	-12.1	-0.10	12289	-102	-0.17
40 K	1049	-1.03	-0.04	2243	-4.6	-0.08	11137	-33	-0.12

Expanded response table

Physical specifications

	Mass	Lead type	Internal atmosphere	Sensor materials
RX-102A-AA	3.3 g	2 copper with heavy build Formvar^® attached with epoxy strain relief at sensor — user should branch to 4 (no polarity)	Air	Thick ruthenium dioxide and bismuth ruthenate films with palladium silver contacts, indium solder, aluminum oxide substrate, sapphire header and copper canister with epoxy seal
RX-202A-AA	3.28 g
RX-103A-AA	3.36 g

Bare chip	A (chip length)	B (pad width)	C (chip width)	D (thickness)	Materials used
RX-102A-BR	1.45 mm (0.057 in)	0.30 mm (0.012 in)	1.27 mm (0.050 in)	0.65 mm (0.022 in)	Thick ruthenium dioxide and bismuth ruthenate films with palladium silver contacts
RX-103A-BR	1.40 mm (0.070 in)	0.21 mm (0.010 in)	1.23 mm (0.060 in)	0.41 mm (0.016 in)