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The 7400 Series VSM has been discontinued. Please consider the 8600 Series VSM as an alternative.

7400 Series VSM Specifications

7404

7407

7410

Magnet pole cap face diameter

51 mm (2.0 in)¹

50 mm (2.0 in)¹

APPLIED FIELD STRENGTH (±1%)

Room temperature

16.2 mm (0.64 in) magnet air gap/

3.6 mm (0.14 in) sample access

21.7 kOe (2.17 T)

26.2 kOe (2.62 T)

31 kOe (3.1 T)

23 mm (0.9 in) magnet air gap/

10 mm (0.4 in) sample access

18.1 kOe (1.81 T)

23.4 kOe (2.34 T)

28.5 kOe (2.85 T)

29 mm (1.14 in) magnet air gap/

16 mm (0.64 in) sample access

15.3 kOe (1.53 T)

21.2 kOe (2.12 T)

25 kOe (2.5 T)

With oven or cryostat option

38.1 mm (1.5 in) magnet air gap/

6.4 mm (0.25 in) sample access

11.8 kOe (1.18 T)

18.3 kOe (1.83 T)

23 kOe (2.3 T)

With single-stage variable temperature option

33 mm (1.3 in) magnet air gap/

6.4 mm (0.25 in) sample access

13.5 kOe (1.35 T)

19.4 kOe (1.94 T)

25.0 kOe (2.5 T)

MOMENT MEASUREMENT

Noise floor (emu RMS)

Room temperature

0.1 TC; 0.1 s/pt
(no averaging)

0.75 µemu

0.1 TC; 1 s/pt

0.4 µemu

0.1 TC; 10 s/pt

0.1 µemu

With oven or cryostat option,
0.1 TC, 10 s/pt

2.5 µemu

With single stage variable
temperature option 0.1 TC, 10 s/pt

1.25 µemu

With vector option 0.1 TC, 10 s/pt

5 µemu

3 µemu

Dynamic range

1 × 10^-7 to 10³ emu

Time constants (TC)

0.1, 0.3, 1.0, 3.0, or 10.0 s

Moment stability²

Less than 0.05% RMS of full scale/day at constant field, constant temperature, and highest range after a 5 h warm-up period

Reproducibility

Better than ±0.5%, or ±0.1% of full scale, fixed rotation angle and range, with sample replacement

Moment accuracy

Better than 1% of reading ±0.2% of full scale with a geometrically identical test sample and calibrant

Sample mass

0 to 10 g (higher mass can be accommodated with decreased performance)

FIELD MEASUREMENT

Field accuracy

1% of reading or ±0.05% of full scale

Field resolution

2800 kA/m (35 kOe)

8 A/m (0.1 Oe)

280 kA/m (3.5 kOe)

0.8 A/m (0.01 Oe)

28 kA/m (350 Oe)

0.08 A/m (0.001 Oe)

Closed loop field control stability

<0.05% RMS of full scale/h

MANUAL ROTATION

Setting resolution

<1°

Setting reproducibility

<1°

Rotation range

0 to 730°

CERTIFICATIONS

yes

Application of Council directives

73/23/EEC; 89/336/EEC

Standard to which conformity is declared

EN61010-1: Overvoltage II, Pollution Degree II; EN61326: Class A, Annex B

UTILITIES

Total system cooling water power dissipation (50 or 60 Hz) — see list of available recirculating chillers

4.25 kW; 7.45 kW with optional 74018

13.4 kW; 16.6 kW with optional 74018

¹ With standard 740EMSC coils
² Tested with an AlNiCo sample in a 1 inch sensing coil gap after system warm-up period with the sample vibrating at field.
The AlNiCo samples’ moment must be >50% of full scale moment range.

7400 Series VSM Equipment

	7404	7407	7410
VSM head drive	Model 740H
VSM frame	1
Control electronics	Model 736
Linear amplifier	Model 142
Bipolar magnet power supply	Model 643	Model 648
Mode	DC current source
Maximum output	±35 V/±70 A (2450 W)	±75 V/±135 A (9.1 kW nominal)
AC line input	204/208 VAC ±10%, 13 A/phase; 220/230 VAC ±10%, 12 A/phase; 380 VAC ±10%, 7 A/phase; 400/415 VAC ±10%, 6.5 A/phase at 50/60 Hz	200 VAC ±10%, 41 A/phase; 208 VAC ±10%, 40 A/phase; 220 VAC ±10%, 38 A/phase; 230 VAC ±10%, 37 A/phase; 380 VAC ±10%, 23 A/phase; 400 VAC ±10%, 21 A/phase; 415 VAC ±10%, 21 A/phase
Cooling water requirements	Tap water or closed cooling system (optional chiller available) +15 °C to +30 °C	Tap water or closed cooling system (optional chiller available) +15 °C to +30 °C
Flow rate	5.7 L (1.5 gal)/min minimum	7.6 L (2 gal)/min minimum
Pressure drop	10 kPa (1.5 psi) at 5.7 L (1.5 gal)/min minimum for power supply only	159 kPa (23 psi) t 7.6 L (2 gal)/min minimum for power supply and mandatory flow switch
Electromagnet	Model EM4-HVA	Model EM7-HV	Model EM10-HV
Pole diameter	100 mm (4 in)	180 mm (7 in)	250 mm (10 in)
Pole cap face diameter	51 mm (2 in)	51 mm (2 in)	50 mm (2 in)
Field homogeneity	±0.1% over 10 mm³ (0.4 in³)	±0.1% over centered 51 mm (2 in) diameter circle	±0.1% over centered 51 mm (2 in) diameter circle
Cooling water requirements	Tap water or closed cooling system (optional chiller available)	Tap water or closed cooling system (optional chiller available)	Tap water or closed cooling system (optional chiller available)
Inlet temperature	15 – 25 °C (59 – 77 °F)	15 – 32 °C (59 – 89 °F)	15 – 25 °C (59 – 77 °F)
Flow rate	7.6 L (2 gal)/min	11.4 L (3 gal)/min	15 L (4 gal)/min
Pressure drop	200 kPa (30 psi)	220 kPa (32 psi)	200 kPa (30 psi)
Water chiller capacity	2.5 kW (8,530 BTU)/h	5 kW (17,060 BTU)/h	10 kW (34,120 BTU)/h
Hall probe	High stability; 74 mm (2.9 in) aluminum stem		High stability; 203 mm (8 in) aluminum stem
Pick-up coils	740EMSC (25.4 mm (1 in))
Instrument console	483 mm (19 in) rack
Computer with IDEAS™ software	Model 740905

7400 Series VSM Options Specifications

Model 74018 variable temperature cryostat
With LHe	Temp range	4.2 K base, 5.5 K to 450 K control
	Temp stability	±0.1 K
With LN₂	Temp range	77.6 K, 85 K to 450 K
	Temp stability	±0.2 K
Temperature resolution		0.001 K
Cool-down time		5 min (15 min initial cool-down)
Nominal ramp rate		Continuous flow
LHe liquid usage		<1 L/h when operating >7 K
LN₂ liquid usage		<1 L/h when operating >7 K
Insulation		Vacuum
Sample zone dimensions	Bore size	7.1 mm (0.28 in)
	Outside diameter	22.4 mm (0.88 in)

Model 74033 autorotation
Full range of rotation		-10 to 730°
Setting resolution		<1°
Setting repeatability		<1°

Model 74034 high temperature oven
Temperature range		303 K to 1273 K
Temperature stability		±0.1 K
Temperature resolution		0.001 K
Nominal ramp rate		353 K/min at maximum heating rate of 80 W
Insulation		Vacuum plus multiple reflective shields
Sample zone dimensions	Bore size	7.1 mm (0.28 in)
	Outside diameter	25 mm (1.0 in)

Model 74035 single stage variable temperature option
Temperature range		78 K (base), 100 K to 950 K (control)
Temperature stability		±0.1 K
Temperature resolution		0.001 K
Gasses		LN₂ and nitrogen gas for T<350 K; argon for T>350 K
Cool-down time		15 min from room temp to 100 K, 40 min from 1000 K to room temp
Nominal ramp rate (in the domain)		5 K/min
Hold time		Continuous flow
LN₂ usage		<0.75 L/h >100 K – 350 K
Nitrogen gas usage		3.2 L/min 100 K – 350 K
Argon gas usage		3.6 L/min
Insulation		Vacuum
Sample zone dimensions	Bore size	7.1 mm (0.28 in)
	Outside diameter	17.8 mm (0.7 in)

Model 74046 magnetoresistance (MR) probe
Number of probes		4
Probe pin to pin spacing		0.9 mm
Total 4-pin spacing		2.7 mm
Nominal sample size		4.5 mm × 4.5 mm cross-section, maximum height 3 mm
Temperature range		20 K to 673 K
Current ranges		6 ranges; 1 µA to 100 mA
Resistance ranges		9 ranges: 0.2 Ω, 2 Ω, 20 Ω, 200 Ω, 2 kΩ, 20 kΩ, 200 kΩ, 2 MΩ, up to 10 MΩ
Probe tip compliance voltage		0 V to 5 V, measurement 0 V to 100V, contact formation

	7404	7407	7410
Model 74032 standard vector coils⁴
Pole caps	102 mm (4 in)⁵	102 mm (4 in)⁵	100 mm (4 in)⁵
Air gap	50.8 mm (2 in)	50.8 mm (2 in)	50.8 mm (2 in)
Maximum applied field	7.7 kOe (0.77 T)	12.5 kOe (1.25 T)	20 kOe (2.0 T)
RMS noise (Y coils)	5 µemu	5 µemu	3 µemu
Sample access	25 mm (1 in)
Torque density minimum (at maximum applied field)	38 × 10^-3 dyn•cm	62 × 10^-3 dyn•cm	60 × 10^-3 dyn•cm

⁴ With 730ESC coils; purchased separately ⁵ Pole caps sold separately