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Model 350 specifications

Input specifications — sample calculations of typical sensor performance

Standard inputs	Sensor temperature coefficient	Input range	Excitation current	Display resolution	Measurement resolution⁷	Electronic accuracy (at 25 °C)⁸	Measurement temperature coefficient	Electronic control stability⁹
NTC RTD/ PTC RTD 10 mV	Negative/positive	0 Ω to 10 Ω	1 mA¹¹	0.1 mΩ	0.1 mΩ	±0.002 Ω ±0.06% of rdg	(0.01 mΩ + 0.001% of rdg)/°C	±0.2 mΩ
		0 Ω to 30 Ω	300 µA¹¹	0.1 mΩ	0.3 mΩ	±0.002 Ω ±0.06% of rdg	(0.03 mΩ + 0.001% of rdg)/°C	±0.6 mΩ
		0 Ω to 100 Ω	100 µA¹¹	1 mΩ	1 mΩ	±0.01 Ω ±0.04% of rdg	(0.1 mΩ + 0.001% of rdg)/°C	±2 mΩ
		0 Ω to 300 Ω	30 µA¹¹	1 mΩ	3 mΩ	±0.01 Ω ±0.04% of rdg	(0.3 mΩ + 0.001% of rdg)/°C	±6 mΩ
		0 Ω to 1 kΩ	10 µA¹¹	10 mΩ	10 mΩ	±0.1 Ω ±0.04% of rdg	(1 mΩ + 0.001% of rdg)/°C	±20 mΩ
		0 Ω to 3 kΩ	3 µA¹¹	10 mΩ	30 mΩ	±0.1 Ω ±0.04% of rdg	(3 mΩ + 0.001% of rdg)/°C	±60 mΩ
		0 Ω to 10 kΩ	1 µA¹¹	100 mΩ	100 mΩ	±1.0 Ω ±0.04% of rdg	(10 mΩ + 0.001% of rdg)/°C	±200 mΩ
		0 Ω to 30 kΩ	300 nA¹¹	100 mΩ	300 mΩ	±2.0 Ω ±0.04% of rdg	(30 mΩ + 0.001% of rdg)/°C	±600 mΩ
		0 Ω to 100 kΩ	100 nA¹¹	1 Ω	1 Ω	±10.0 Ω ±0.04% of rdg	(100 mΩ + 0.001% of rdg)/°C	±2 Ω
		0 Ω to 300 kΩ	30 nA¹¹	1 Ω	3 Ω	±30.0 Ω ±0.04% of rdg	(300 mΩ + 0.001% of rdg)/°C	±6 Ω
NTC RTD 1 mV	Negative	0 Ω to 10 Ω	100 µA¹¹	0.1 mΩ	1 mΩ	±0.01 Ω ±0.04% of rdg	(0.1 mΩ + 0.001% rdg)/°C	±2 mΩ
		0 Ω to 30 Ω	30 µA¹¹	0.1 mΩ	3 mΩ	±0.01 Ω ±0.04% of rdg	(0.3 mΩ + 0.001% of rdg)/°C	±6 mΩ
		0 Ω to 100 Ω	10 µA¹¹	1 mΩ	10 mΩ	±0.1 Ω ±0.04% of rdg	(1 mΩ + 0.001% of rdg)/°C	±20 mΩ
		0 Ω to 300 Ω	3 µA¹¹	1 mΩ	30 mΩ	±0.1 Ω ±0.04% of rdg	(3 mΩ + 0.001% of rdg)/°C	±60 mΩ
		0 Ω to 1 kΩ	1 µA¹¹	10 mΩ	100 mΩ	±1.0 Ω ±0.04% of rdg	(10 kΩ + 0.001% of rdg)/°C	±200 mΩ
		0 Ω to 3 kΩ	300 nA¹¹	10 mΩ	300 mΩ	±2.0 Ω ±0.04% of rdg	(30 mΩ + 0.001% of rdg)/°C	±600 mΩ
		0 Ω to 10 kΩ	100 nA¹¹	100 mΩ	1 Ω	±10.0 Ω ±0.04% of rdg	(100 mΩ + 0.001% of rdg)/°C	±2 Ω
		0 Ω to 30 kΩ	30 nA¹¹	100 mΩ	3 Ω	±30 Ω ±0.04% of rdg	(300 mΩ + 0.001% of rdg)/°C	±6 Ω
		0 Ω to 100 kΩ	10 nA¹¹	1 Ω	10 Ω	±100 Ω ±0.04% of rdg	(1 Ω + 0.001% of rdg)/°C	±20 Ω

Scanner option Model 3062	Sensor temperature coefficient	Input range	Excitation current	Display resolution	Measurement resolution	Electronic accuracy (at 25 °C)⁸	Measurement temperature coefficient	Electronic control stability⁹
Diode	Negative	0 V to 2.5 V	10 µA ± 0.05%¹⁰	10 µV	10 µV	±80 µV ±0.005% of rdg	(10 µV + 0.0005% of rdg)/°C	±20 µV
Diode	Negative	0 V to 10 V	10 µA ± 0.05%¹⁰	100 µV	20 µV	±160 µV ±0.01% of rdg	(20 µV + 0.0005% of rdg)/°C	±40 µV
PTC RTD	Positive	0 Ω to 10 Ω	1 mA¹¹	0.1 mΩ	0.2 mΩ	±0.002 Ω ±0.01% of rdg	(0.01 mΩ + 0.001% of rdg)/°C	±0.4 mΩ
		0 Ω to 30 Ω	1 mA¹¹	0.1 mΩ	0.2 mΩ	±0.002 Ω ±0.01% of rdg	(0.03 mΩ + 0.001% of rdg)/°C	±0.4 mΩ
		0 Ω to 100 Ω	1 mA¹¹	1 mΩ	2 mΩ	±0.004 Ω ±0.01% of rdg	(0.1 mΩ + 0.001% of rdg)/°C	±4 mΩ
		0 Ω to 300 Ω	1 mA¹¹	1 mΩ	2 mΩ	±0.004 Ω ±0.01% of rdg	(0.3 mΩ + 0.001% of rdg)/°C	±4 mΩ
		0 Ω to 1 kΩ	1 mA¹¹	10 mΩ	20 mΩ	±0.04 Ω ±0.02% of rdg	(1 mΩ + 0.001% of rdg)/°C	±40 mΩ
		0 Ω to 3 kΩ	1 mA¹¹	10 mΩ	20 mΩ	±0.04 Ω ±0.02% of rdg	(3 mΩ + 0.001% of rdg)/°C	±40 mΩ
		0 Ω to 10 kΩ	1 mA¹¹	100 mΩ	200 mΩ	±0.4 Ω ±0.02% of rdg	(10 mΩ + 0.001% of rdg)/°C	±400 mΩ
NTC RTD 10 mV	Negative	0 Ω to 10 Ω	1 mA¹¹	0.1 mΩ	0.15 mΩ	±0.002 Ω ±0.06% of rdg	(0.01 mΩ + 0.001% rdg)/°C	±0.3 mΩ
		0 Ω to 30 Ω	300 µA¹¹	0.1 mΩ	0.45 mΩ	±0.002 Ω ±0.06% of rdg	(0.03 mΩ + 0.0015% of rdg)/°C	±0.9 mΩ
		0 Ω to 100 Ω	100 µA¹¹	1 mΩ	1.5 mΩ	±0.01 Ω ±0.04% of rdg	(0.1 mΩ + 0.001% of rdg)/°C	±3 mΩ
		0 Ω to 300 Ω	30 µA¹¹	1 mΩ	4.5 mΩ	±0.01 Ω ±0.04% of rdg	(0.3 mΩ + 0.0015% of rdg)/°C	±9 mΩ
		0 Ω to 1 kΩ	10 µA¹¹	10 mΩ	15 mΩ + 0.002% of rdg	±0.1 Ω ±0.04% of rdg	(1 kΩ + 0.001% of rdg)/°C	±30 mΩ ±0.004% of rdg
		0 Ω to 3 kΩ	3 µA¹¹	10 mΩ	45 mΩ + 0.002% of rdg	±0.1 Ω ±0.04% of rdg	(3 mΩ + 0.0015% of rdg)/°C	±90 mΩ ±0.004% of rdg
		0 Ω to 10 kΩ	1 µA¹¹	100 mΩ	150 mΩ + 0.002% of rdg	±1.0 Ω ±0.04% of rdg	(10 mΩ + 0.001% of rdg)/°C	±300 mΩ ±0.004% of rdg
		0 Ω to 30 kΩ	300 nA¹¹	100 mΩ	450 mΩ + 0.002% of rdg	±2.0 Ω ±0.04% of rdg	(30 mΩ + 0.001% of rdg)/°C	±900 mΩ ±0.004% of rdg
		0 Ω to 100 kΩ	100 nA¹¹	1 Ω	1.5 Ω + 0.005% of rdg	±10.0 Ω ±0.04% of rdg	(100 mΩ + 0.002% of rdg)/°C	±3 Ω ±0.01% of rdg

Thermocouple option Model 3060	Sensor temperature coefficient	Input range	Excitation current	Display resolution	Measurement resolution	Electronic accuracy (at 25 °C)⁸	Measurement temperature coefficient	Electronic control stability⁹
Thermocouple	Positive	±50 mV	NA	0.1 µV	0.4 µV	±1 µV ±0.05% of rdg¹²	(0.1 µV + 0.001% of rdg)/°C	±0.8 µV

Capacitance option Model 3061	Sensor temperature coefficient	Input range	Excitation current	Display resolution	Measurement resolution	Electronic accuracy (at 25 °C)⁸	Measurement temperature coefficient	Electronic control stability⁹
Capacitance	Positive or negative	0.1 nF to 15 nF	3.496 kHz 1 mA square wave	0.1 pF	0.05 pF	±50 pF ±0.1% of rdg	2.5 pF/°C	0.1 pF
Capacitance	Positive or negative	1 nF to 150 nF	3.496 kHz 10 mA square wave	1 pF	0.5 pF	±50 pF ±0.1% of rdg	5 pF/°C	1 pF

⁷ Measurement resolution measured at 4.2 K to remove the thermal noise of the resistor
⁸ With current reversal enabled for RTD measurements
⁹ Control stability of the electronics only, in ideal thermal system
¹⁰ Current source error has negligible effect on measurement accuracy
¹¹ Current source error is removed during calibration
¹² Accuracy specification does not include errors from room temperature compensation

Thermometry

Number of inputs

4 (8 with optional scanner card)

Input configuration

Inputs can be configured from the front panel to accept any of the supported input types. Thermocouple, capacitance, and diode inputs require an optional input card that can be installed in the field. Once installed, the optional inputs can be selected from the front panel like any other input type.

Isolation

Sensor inputs optically isolated from other circuits but not from each other

A/D resolution

24-bit

Input accuracy

Sensor dependent, refer to Input Specifications table

Measurement resolution

Sensor dependent, refer to Input Specifications table

Maximum update rate

10 rdg/s on each non-scanned input

Maximum update rate (scanner)

The maximum update rate for a scanned input is 10 rdgs/s distributed among the enabled channels. Any channel configured as 100 kΩ RTD with reversal on changes the update rate for the channel to 5 rdgs/s.

Number of scanner channels enabled*	Update rate
1	10 rdg/s(100 ms/rdg)
2	5 rdg/s(200 ms/rdg)
3	3⅓ rdg/s(300 ms/rdg)
4	2½ rdg/s(400 ms/rdg)
5	2 rdg/s(500 ms/rdg)

*No channels configured for 100 kΩ NTC RTD

Autorange

Automatically selects appropriate NTC RTD or PTC RTD range

User curves

Room for 39 200-point CalCurves™ or user curves

SoftCal™

Improves accuracy of DT-470 diode to ±0.25 K from 30 K to 375 K; improves accuracy of platinum RTDs to ±0.25 K from 70 K to 325 K; stored as user curves

Math

Maximum and minimum

Filter

Averages 2 to 64 input readings

Sensor input configuration

	RTD	Diode (option)	Thermocouple (option)	Capacitance (option)
Measurement type	4-lead differential	4-lead differential	2-lead differential, room temperature compensated	4-lead differential, variable duty cycle
Excitation	Constant current with current reversal	10 µA constant current	NA	Constant current, 3.496 kHz square wave
Supported sensors	100 Ω Platinum, 1000 Ω Platinum, Germanium, Carbon-glass, Cernox® and Rox™	Silicon, GaAlAs	Most thermocouple types	CS-501GR
Standard curves	PT-100, PT-1000, RX-102A, RX-202A	DT-470, DT-670, DT-500-D, DT-500-E1	Type E, Type K, Type T, AuFe 0.07% vs. Cr, AuFe 0.03% vs. Cr	NA
Input connector	6-pin DIN	6-pin DIN	Screw terminals in a ceramic isothermal block	6-pin DIN

Control

Control outputs	4

Heater outputs (outputs 1 & 2)
Control type	Closed loop digital PID with manual heater output or open loop
Update rate	10/s
Tuning	Autotune (one loop at a time), PID, PID zones
Control stability	Sensor dependent, see Input Specifications table
PID control settings
Proportional (gain)	0 to 9999 with 0.1 setting resolution
Integral (reset)	1 to 1000 (1000/s) with 0.1 setting resolution
Derivative (rate)	1 to 200% with 1% resolution
Manual output	0 to 100% with 0.01% setting resolution
Zone control	10 temperature zones with P, I, D, manual heater out, heater range, control channel, ramp rate
Setpoint ramping	0.001 K/min to 100 K/min

Output 1

	25 Ω setting	50 Ω setting
Type	Variable DC current source
D/A resolution	16-bit
Max power	75 W	50 W
Max current	1.732 A	1 A
Voltage compliance (min)	50 V	50 V
Heater load for max power	25 Ω	50 Ω
Heater load range	10 Ω to 100 Ω
Ranges	5 (decade steps in power)
Heater noise	1.2 µA RMS (dominated by line frequency and its harmonics)
Grounding	Output referenced to chassis ground
Heater connector	Dual banana
Safety limits	Curve temperature, power up heater off, short circuit protection

Output 2

Type	Variable DC current source
D/A resolution	16-bit
Max power	1 W
Max current	100 mA
Voltage compliance (min)	10 V
Heater load for max power	100 Ω
Heater load range	25 Ω to 2 kΩ
Ranges (100 Ω load)	1 W, 100 mW, 10 mW, 1 mW, 100 µW
Heater noise	<0.005% of range
Grounding	Output referenced to measurement common
Heater connector	Dual banana
Safety limits	Curve temperature, power up heater off, short circuit protection

Analog outputs (outputs 3 & 4)

Control type	Closed loop PID, PID zones, warm-up heater mode, still heater, manual output, or monitor output
Warm-up heater mode settings
Warm-up on percentage	0 to 100% with 1% resolution
Warm-up mode	Continuous control or auto-off
Monitor output settings
Scale	User selected
Data source	Temperature or sensor units
Settings	Input, source, top of scale, bottom of scale, or manual
Type	Variable DC voltage source
Update rate	10/s
Range	±10 V
Resolution	16-bit, 0.3 mV
Accuracy	±2.5 mV
Noise	0.3 mV RMS
Maximum current	100 mA
Maximum power	1 W (into 100 Ω)
Minimum load resistance	100 Ω (short-circuit protected)
Connector	Detachable terminal block

Front panel

Display	8-line by 40-character (240 × 64 pixel) graphic LCD display module with LED backlight
Number of reading displays	1 to 8
Display units	K, °C, V, mV, Ω, nF
Reading source	Temperature, sensor units, max, and min
Display update rate	2 rdg/s
Temperature display resolution	0.00001° from 0° to 9.99999°, 0.0001° from 10° to 99.9999°, 0.001° from 100° to 999.999°, 0.01° above 1000°
Sensor units display resolution	Sensor dependent, to 6 digits
Other displays	Input name, setpoint, heater range, heater output, and PID
Setpoint setting resolution	Same as display resolution (actual resolution is sensor dependent)
Heater output display	Numeric display in percent of full scale for power or current
Heater output resolution	0.01%
Display annunciators	Control input, alarm, tuning
LED annunciators	Remote, Ethernet status, alarm, control outputs
Keypad	27-key silicone elastomer keypad
Front panel features	Front panel curve entry, display contrast control, and keypad lock-out

Interfaces

IEEE-488.2
Capabilities	SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1
Reading rate	To 10 rdg/s on each input
Software support	LabVIEW™ driver
USB
Function	Emulates a standard RS-232 serial port
Baud rate	57,600
Connector	B-type USB connector
Reading rate	To 10 rdg/s on each input
Software support	LabVIEW™ driver
Ethernet
Function	TCP/IP, web interface, curve handler, configuration backup, chart recorder
Connector	RJ-45
Reading rate	To 10 rdg/s on each input
Software support	LabVIEW™ driver
Alarms
Number	4 (8 with scanner option), high and low for each input
Data source	Temperature or sensor units
Settings	Source, high setpoint, low setpoint, deadband, latching or non-latching, audible on/off, and visible on/off
Actuators	Display annunciator, beeper, and relays
Relays
Number	2
Contacts	Normally open (NO), normally closed (NC), and common (C)
Contact rating	30 VDC at 3 A
Operation	Activate relays on high, low, or both alarms for any input, or manual mode
Connector	Detachable terminal block

General

Ambient temperature	15 °C to 35 °C at rated accuracy; 5 °C to 40 °C at reduced accuracy
Power requirement	100, 120, 220, 240 VAC, ±10%, 50 or 60 Hz, 220 VA
Size	435 mm W × 89 mm H × 368 mm D (17 in × 3.5 in × 14.5 in), full rack
Weight	7.6 kg (16.8 lb)
Approval	CE mark, RoHS

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