12.3 Unit Specification
223
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)
12.3.2 Model 8949 Universal Unit
Input Type Unbalanced (Isolated between channels)
(except resistance temperature detector and humidity sensor channels, which are not iso-
lated)
Number of Input
Channels
15 channels (Each channel can be set for voltage, thermocouple, resistance temperature
detector or humidity sensor)
Input terminals Push-type terminal block (four terminals per channel)
Detachable terminal block, terminal cover included
Measurement Parameter Voltage, thermocouple (K, E, J, T, N, W, R, S, B),
Resistance temperature detector (Pt 100, JPt 100)
(3- or 4-wire connection, 1 mA measurement current), Humidity (requires optional Model
9701 Humidity Sensor)
Resolution 16 bit
Maximum Sampling Rate 10 ms (5 s when also measuring humidity)
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/ 50 Hz/ 60 Hz (Digital filtering is automatically set to the appropriate recording inter-
val when selecting 50 or 60 Hz.)
Input Resistance 1 MΩ ± 5% (Voltage measurement and temperature measurement with thermocouple when
Burn out detection is Off), 2 MΩ ± 5% (Temperature measurement with resistance tempera-
ture detector),
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 ), 140dB min. (50
Hz input from signal source resistance of 100 Ω or less recording at 5 s intervals, with 50
Hz digital filter enabled), (60 Hz input from signal source resistance of 100 Ω or less
recording at 5 s intervals, with 60 Hz digital filter enabled)
Maximum Input Voltage 60 VDC
Maximum Rated Voltage
between Channels
120 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°F to 104°F)
Humidity : 30 to 80%RH (no condensation)
Storage Temperature and
Humidity
Temperature : -10 to 50°C (14°F to 122°F),
Humidity : 80%RH or less (no condensation)
Accuracy Guarantee for
Temperature and Humid-
ity
Temperature : 23 ± 5°C (73°F 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. 530 g (18.7 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
Accessory Flathead screwdriver (for terminal block) x 1, Instruction Manual, Connection Plate
Applying Standards Safety EN61010
EMC EN61326 Class A
Product warranty period 3 years
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