Hioki MEMORY HiLOGGER LR8450 Instruction Manual page 322

Maximum rated
terminal-to-ground
voltage
Input resistance
Allowable signal
source resistance
Reference junction
compensation
Thermocouple wire
break detection
Data refresh interval
Digital filters
Power
supply
frequency
filter setting
60 Hz
50 Hz
*3: Setting not available when mixed with Pt1000 measurement.
-2. Accuracy specifications
Accuracy guarantee
conditions
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300 V AC, DC (Measurement Category II)
Between any input channel (SoH, SoL, +, −) and the instrument (LR8450/LR8450-01) or
between any two modules
Anticipated transient overvoltage: 2500 V
Ω
10 M or greater (10 mV f.s. to 2 V f.s. voltage ranges, all thermocouple ranges, all
resistance temperature detector and resistor ranges)
Ω
1 M ±5% (10 V f.s. to 100 V f.s. voltage ranges, 1-5 V f.s. voltage range, humidity
range)
Ω
1 k or less
Internal/external (user-selectable) (during thermocouple measurement)
The system will check for wire breaks at the date refresh intervals 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.)
10 ms* 1 , 20 ms* 2 , 50 ms*
*1: Setting available when thermocouple wire break detection is disabled and not set for
Pt1000 measurement.
*2: Setting available when not set for Pt1000 measurement.
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:
Wire
break
detection
10 ms* 3 20 ms*
setting
Off 20.8 k 6.94 k
On – 20.8 k
Off 20.8 k 6.94 k
On – 20.8 k
Accuracy guarantee
duration
Accuracy guarantee
duration after
adjustment made by
Hioki
Accuracy guarantee
temperature and
humidity range
Warm-up time
The conditions have been specified with zero-adjustment finished and the cutoff
frequency set to 50 Hz/60 Hz (see cutoff frequency table in "Digital filters" [p. 3 17]).
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2 , 100 ms, 200 ms, 500 ms, 1 s, 2 s, 5 s, 10 s
Data refresh interval
3 50 ms* 3 100 ms 200 ms 500 ms
2.98 k 2.37 k 739
6.94 k 2.98 k 2.37 k
2.98 k 2.37 k 739
6.94 k 2.98 k 2.37 k
1 year
1 year
23°C ±5°C (73°F ±9°F), 80% RH or less
At least 30 min. after connecting to the LR8450/LR8450-01
Memory HiLogger and turning on the instrument
Plug-in Module Specifications
–: Setting not available
1 s 2 s 5 s
60 60 60 60
739 60 60 60
50 50 50 50
739 50 50 50
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10 s
60
60
50
50
Unit: Hz