| Specifications |
| Measurement type |
AC, 4-lead differential, resistance |
| Number of inputs |
1; up to 16 with scanner |
| Measurement units |
W, K (with temperature response curve) |
| Resistance ranges |
2 mW to 2 MW (excitation dependent) |
| Reading rate |
10 readings per s (same range and channel) |
| Range change settling |
3 s + filter settling |
| Channel change (scan) settling |
3 s + filter settling |
| A/D resolution |
24-bit |
| Input noise figure (370/3716) |
33 nV/√Hz |
| Input noise figure (3716L) |
4 nV/√Hz |
| Input noise figure (3708) |
2 nV/√Hz |
| Measurement resolution |
Range dependent, (see 370 Performance Specification Table) |
| Accuracy |
Range dependent, (see 370 Performance Specification Table) |
| Measurement temp coefficient |
(±0.0015% of reading ±0.0002% of range)/°C |
| Lead connections |
V+, V-, l+, l-, V shield, l shield, individual guards |
| Scanner lead connections |
V+, V-, l+, l- for each sensor, shield common to all |
| Max lead resistance |
100 W + 10% of resistance range per lead for current ≤ 3.16 mA, 10 W + 10% of resistance range per lead for current ≥ 10 mA |
| Input isolation |
Measurement optically isolated from chassis ground |
| Common mode reduction |
Matched impedance voltage input and current output, active CMR |
| Excitation type |
Sinusoidal AC current source |
| Excitation frequency |
13.7 Hz (9.8 Hz and 16.2 Hz alternates) |
| Excitation currents |
21 ranges from 3.16 pA to 31.6 mA RMS |
| Minimum excitation power |
10-18 W into 100 kW (see 370 Performance Specification Table) |
| Max DC current (370/3716) |
4 pA + 1% of excitation current (1.6 x 10-18 W into 100 kW) |
| Max DC current (3716L) |
30 pA + 1% of excitation current |
| Current protection |
Current leads relay shorted on power-up and range change |
| |
|
| Voltage ranges |
12 ranges from 2 µV to 632 mV RMS |
| Voltage over range |
20% nominal |
| Input impedance |
Approaches 5 x 1012 W |
| |
|
| Range selection modes |
Manual, Voltage Excitation, Current Excitation, and Autorange |
| Scanner modes |
Manual or Autoscan |
| Filter |
Settling times 1 s to 200 s |
| Additional software features |
Max/Min capture, Linear equation, user programmable pause on range and input change |
| |
| Temperature Conversion |
| Supported cryogenic temperature sensors |
Any resistive sensor including NTC resistors (e.g., Germanium, Carbon-Glass, Cernox™, Ruthenium Oxide [Rox™]) and PTC resistors (e.g., Rhodium-Iron RTD) |
| Requirements |
Requires calibrated sensor and a temperature response curve loaded into the instrument at the factory or by the user |
| Temperature coefficient |
Negative or positive |
| Temperature units |
K |
| Low temperature |
Below 20 mK in a well-designed system |
| Temperature resolution |
Sensor and temperature dependent (see Sensor Performance) |
| Curve memory |
Space for twenty 200-point curves |
| Curve entry |
Entered via front panel, computer interface, or CalCurve™ option |
| Curve format |
W/K, Log W/K |
| |
| Temperature Control |
| Control type |
High resolution digital PID |
| Control modes |
Closed Loop PID, Open Loop |
| Tuning modes |
Manual PID, Zones |
| Setpoint units |
W or K (with temperature calibration curve) |
| Setpoint resolution |
Same as reading display resolution |
| Control stability |
Below 10 mK p-p at 50 mK, system dependent |
| Heater output type |
Variable DC current source |
| Heater output isolation |
Optically isolated from chassis and measurement ground |
| Output D/A resolution |
18-bit |
| Heater output ranges |
100 mA, 31.6 mA, 10 mA, 3.16 µA, 1 µA, 316 µA, 100 µA , 31.6 µA |
| Heater output compliance |
10 V |
| Max power of output ranges |
1 W, 100 mW, 10 mW, 1 mW, 100 µW, 10 µW, 1 µW, 0.1 µW (nominal 100 W) |
| Heater type |
Resistive |
| Heater resistance range |
1 W to 100 kW, 100 W for maximum power |
| Heater output gain accuracy |
± 1% of setting |
| Heater output offset (at 0%) |
± 0.02% of range |
| Max heater noise current |
<0.005% of range |
| PID Control Parameters |
| Proportional |
0.001 to 1000 |
| Integral |
0 s to 10,000 s |
| Derivative |
0 s to 10,000 s |
| Manual Output |
0% to 100% (resolution 0.001%) |
|
| PID zone settings |
10 zones that include setpoint, heater range, PID, relays, and analog outputs (still) |
| Still output |
Up to 1 W of power available using analog output #2 |
| Heater protection |
Short circuit-protected, disabled with a relay on power-up, defaults to off range on power-up, selectable heater range limit, open circuit detection |
| Scanner support |
Control with scanned input is supported with reduced stability |
| |
| Front Panel |
| Display type |
Graphic (8 line by 40 character) vacuum fluorescent display |
| Number of reading displays |
1 to 8 |
| Reading display units |
mW, W, kW, MW, mK, K |
| Display resolution |
4, 5, or 6 digit, user selected |
| Display update rate |
2 readings per second |
| Reading display options |
W, K, Max, Min, Linear |
| Other displays |
Channel number, units, resistance range, excitation voltage or current, excitation power, control setpoint, heater range, and heater output |
| Display annunciators |
Reading errors, CMR, Alarm, Ramp, Zone, Remote |
| LED annunciators |
Autorange, Excitation Mode, Autoscan |
| Keypad |
36 key, numeric and specific functions |
| |
| Interface |
| IEEE-488.2 interface capability |
SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1 |
| Software support |
LabView™ driver for IEEE-488 interface (consult factory for availability) |
| Serial interface capability |
RS-232C, DE-9 connector, 9600 baud |
| Alarms |
| Number |
Up to 32, high and low for each channel |
| Settings |
Source, High Setpoint, Low Setpoint, Deadband, Latching/Non-latching,
Audible on/off |
| Actuators |
Display annunciator, beeper, relays |
|
| Relays |
| Number |
2 |
| Contacts |
Normally Open, Normally Closed, and Common |
| Contact rating |
30 VDC at 5 A |
| Operation |
Relays may be activated on high/low alarm setpoints or manually |
| Connector |
Detachable terminal block |
|
| Analog voltage outputs |
| Number |
2 |
| Type |
Variable DC voltage source |
| Scale |
User specified |
| Range |
±10 V |
| Resolution |
0.3 mV, 0.003% of full scale |
| Accuracy |
±2.5 mV |
| Maximum current |
100 mA |
| Maximum power |
1 W |
| Minimum load resistance |
100 W (short circuit-protected) |
| Ground reference |
Chassis |
| Operation |
Tracks reading, error (DR) using linear equation, or use as still heater |
| Connector |
BNC |
|
| Monitor output |
| Operation |
User selects one of several analog voltage diagnostic points (must remain isolated) |
| Connector |
BNC |
|
| Frequency reference |
| Signal type |
Phase sensitive detector reference (must remain isolated) |
| Amplitude |
0 to +5 V nominal |
| Waveform |
Square wave |
| Connector |
BNC |
|
|
|
| General |
| Ambient temperature |
15 °C to 35 °C at rated accuracy; 5 °C to 40 °C at reduced accuracy |
| Calibration schedule |
1 year |
| Power requirement |
100, 120, 220, 240 VAC, +6% -10%, 50 or 60 Hz, 50 VA |
| Size |
435 mm W x 89 mm H x 368 mm D (17 in × 3.5 in × 14.5 in), full rack |
| Weight |
5.9 kg (12.9 lb) |
| Approval |
CE mark |
| |
| 3716/L and 3708 Scanners |
|
| Size |
135 mm W × 66 mm H × 157 mm D (5.2 in × 2.6 in × 6.2 in) |
|
Weight |
1 kg (2.1 lb) |
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