JT-11/JT-11A Ultra-precision Handheld Digital Thermometer - Product

Input type: PT20/PT100/PT200/PT500/user-defined thermal resistor B/R/S/N/K/J/T/E thermocouple/thermopile

Number of input channels: 2

Main functions: sensor matching to achieve ultra-high precision measurement.

Maximum and minimum values, average value, maximum-minimum value display.

Over-limit alarm.

℃/F/K/Q/mv measurement unit switching.

Data storage up to 390,000 records, including time information.

USB data directly connected to computer.

Power supply: 6~15VDC external power supply or 4 AAA batteries.

Communication rate: 9600bps (JT-11)

1200/2400/4800/9600/19200/38400bps can be set (JT-11A)

Purpose:

①Precision resistance detection, platinum resistance temperature corresponding resistance detection saves the consumption of second-class standard thermometers.

②Constant temperature field acceptance.

Resistance measurement accuracy (AT25 ℃):

Range	Sampling mode	Resolution (typical) Ω	Error (Max) Ω
300Ω	Ω	0.0001	±(0.0005+0.0006%*READ)
	TRUEQ
3kQ	Ω	0.006	±(0.01+0.005%*READ)
	TRUEQ

DC voltage measurement accuracy (AT25 ℃)

Range mV	Resolution (typical) μV	Error (Max) μV
70	0.1	±(1+0.004%*READ)

Resistance measurement accuracy (AT25 ℃): Temperature Drift

Project	Impact per 1 ℃ change of environment (maximum)
Resistance	2ppm*READ
Voltage	7ppm*READ

Resistance measurement accuracy (AT25 ℃): electrical performance

The parameter conditions given in this table are: ambient temperature 25 ℃, power supply voltage 6V, dual-channel resistor sampling, and measuring range 300 Ω.

Project	Condition	Typical value
Working current	Turn on backlight	13.5mA
	Turn off backlight	11mA
Resistance measurement sampling time	Step change> 3mΩ, two channels simultaneously measure resistance	High resolution	Low resolution
		6s	2s
	Step change <3mΩ, two-channel simultaneous measurement of resistance	High resolution	Low resolution
		18s	6s
Voltage measurement sampling time	Two-channel simultaneous measurement of mv	0.5s
Thermocouple measurement sampling time	Simultaneous measurement of thermocouple signals with two channels	High resolution	Low resolution
		6.5s	2.5s

Resistance measurement accuracy (AT25 ℃): the overall accuracy after matching with the sensor

Enter model number	Range (℃)	Accuracy (℃)
PT100	-50 ~ 200	± 0.01
PT50	-60 ~ 400	± 0.02
T-Type thermocouple	-200 ~ -50	± 0.3
T-Type thermocouple	-50 ~ -300	± 0.15
N-type thermocouple	0 ~ 400	± 0.3
N-type thermocouple	300 ~ 600	± 0.5
S-type thermocouple	0 ~ 600	± 0.5
S-type thermocouple	600 ~ 1100	± 1.5