12.3 Unit Specification
221
Chapter 12 Specifications
12
Accuracy applies to 23±5°C (73±9°F), 30 to 80%RH (When executing zero-position adjustment 30 minute after power on)
12.3 Unit Specification
12.3.1 Model 8948 Voltage/Temp Unit
Input Type Unbalanced (Isolated between channels)
Number of Input
Channels
15 channels (Each channel can be set for voltage, or for a thermocouple)
Input Terminals M3 screw-type terminal block (two terminals per channel)
Detachable terminal block, terminal cover included
Measurement Parameter Voltage, thermocouple (K, E, J, T, N, W, R, S, B)
Resolution 16 bit
Maximum Sampling Rate 10 ms
Reference Junction
Compensation Accuracy
± 0.5°C (K, E, J, T) (Reference Junction Compensation: internally improves accuracy of
thermocouple measurements.)
± 1.0°C (N, R, S, B, W)
Temperature
Characteristic
To the measurement accuracy add (measurement accuracy × 0.1) per ºC
Reference Junction
Compensation
Selectable internal or external (measuring with the thermocouple)
Digital Filter OFF/ 50Hz/ 60Hz (Digital filtering is automatically set to the appropriate recording interval
when selecting 50 or 60 Hz.)
Input Resistance 1 MΩ ± 5% (Voltage measurement and temperature measurement with thermocouple when
Burn out detection is Off)
850 kΩ ± 5% (Temperature measurement with thermocouple when Burn out detection is On)
Normal Mode Rejection
Ratio
50 dB min.
(50 Hz input recording at 5 s intervals, with 50 Hz digital filter enabled)
(60 Hz input recording at 5 s intervals, with 60 Hz digital filter enabled)
Common Mode Rejection
Ratio
100 dB min. (at 50/60 Hz, digital filter OFF with signal source resistance 100 Ω max.)
140 dB min. (50 Hz input from signal source resistance of 100 Ω or less recording at 5 s
intervals, with 100 mV f.s. range selected and 50 Hz digital filter enabled), (60 Hz input
from signal source resistance of 100 Ω or less recording at 5 s intervals, with 100 mV f.s.
range selected and 60 Hz digital filter enabled)
Maximum Input Voltage 100 VDC
Maximum Rated Voltage
between Channels
200 VDC
Maximum Rated Voltage
to Earth
600 Vrms or 600 VDC (between each input channel and main unit, and between each
unit), Measurement category II, (anticipated transient overvoltage 4000 V)
Dielectric Strength 4.29 kVAC for 1 minute
(between each input channel and main unit, and between each unit)
350 VAC for 1 minute (between each input channels)
Location for Use Altitude up to 2000 m (6562 feet), indoors,
Pollution degree 2
Operating Temperature
and Humidity
Temperature : 0 to 40°C (32 to 104°F)
Humidity : 30 to 80%RH (no condensation)
Storage Temperature and
Humidity
Temperature : -10 to 50°C (14 to 122°F),
Humidity : 80%RH or less (no condensation)
Accuracy Guarantee for
Temperature and
Humidity
Temperature : 23 ± 5°C (73 to 9°F),
Humidity : 30 to 80%RH (no condensation)
Period of Guaranteed
Accuracy
1 year
Dimensions Approx. 38.5W × 133H × 141.2D mm (1.52”W × 5.24”H × 5.56”D) (excluding projections)
Mass Approx. 550 g (19.4 oz.)
Effect of Conducted
Radio-Frequency Electro-
magnetic Field
Within ± 2%f.s. at 3 V
Effect of Radiated Radio-
frequency Electromag-
netic Field
Within ± 2%f.s. at 3 V/m
Accessories Instruction Manual, Connection Plate
Applying Standards Safety EN61010
EMC EN61326 Class A
Product warranty period 3 years
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