Hioki LR8450, Instruction Manual

Page: 247 / 310

244
Plug-in Module Specifications
Input resistance 10 M
Ω
or greater (10 mV f.s. to 2 V f.s. voltage ranges, all thermocouple ranges)
1 M
Ω
±5% (10 V f.s. to 100 V f.s. voltage range, 1-5 V f.s. voltage range, humidity range)
Allowable signal
source resistance
1 k
Ω
or less
Reference junction
compensation
Internal/external (user-selectable) (during thermocouple measurement)
Thermocouple wire
break detection
The system will check for wire breaks each date refresh interval during thermocouple
measurement.
On/Off (user-selectable) (set for entire module)
Detection current: 5 μA ±20%
No current flows while acquiring measurement data.
(Setting not available when the data refresh interval is set to 10 ms.)
Data refresh interval 10 ms*, 20 ms, 50 ms, 100 ms, 200 ms, 500 ms, 1 s, 2 s, 5 s, 10 s
*: Setting available when thermocouple wire break detection is disabled.
Digital filters
The digital filter cutoff frequency is automatically set as described in the following table
according to the data refresh interval, Wire break detection setting, and power supply
frequency filter setting:
–: Setting not available
Power supply
frequency
filter setting
Wire
break
detection
setting
Data refresh interval
10 ms 20 ms 50 ms 100 ms 200 ms 500 ms 1 s 2 s 5 s 10 s
60 Hz Off 20.8 k 6.94 k 2.98 k 2.37 k 739 60 60 60 60 60
On – 20.8 k 6.94 k 2.98 k 2.37 k 739 60 60 60 60
50 Hz Off 20.8 k 6.94 k 2.98 k 2.37 k 739 50 50 50 50 50
On – 20.8 k 6.94 k 2.98 k 2.37 k 739 50 50 50 50
Unit: Hz
-2. Accuracy specifications
Accuracy guarantee
conditions
Accuracy guarantee
period
1 year
Accuracy guarantee
period after adjustment
made by Hioki
1 year
Accuracy guarantee
temperature and
humidity range
23°C ±5°C (73°F±9°F), 80% RH or less
Warm-up time At least 30 min. after connecting to the LR8450/LR8450-01
Memory HiLogger and turning on the instrument
The conditions have been specified with after zero-adjustment finished and the cutoff
frequency set to 50 Hz/60 Hz (see cutoff frequency table in “Digital filters” [p. 244]).