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15.2 Analog Inputs
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5.2.5 8940 F/V UNIT
A/D resolution 12 bits
Vertical axis resolution 160 LSB/DIV
Measurement functions Frequency, count, pulse duty ratio, voltage and current measurement
Maximum sampling period 1 μs (voltage, current and count measurement)
1.125 μs (frequency and pulse duty ratio measurement)
Low-pass filter OFF, 5, 500, 5 k, 100 k ±50% (Hz) -3 dB
Input coupling DC, GND, AC (fixed DC coupling except voltage and current measurement)
Pull-up resistance ON/OFF (OFF in current measurement), 10 kΩ
Maximum input voltage 30 Vrms or 60 VDC
Maximum rated voltage to
earth
30 Vrms or 60 VDC (BNC)
BNC terminal
(for voltage, frequency, coun
and pulse duty ratio
measurement)
Input resistance: 1 MΩ±1% (with pull-up resistance disabled)
Input capacitance: 60 pF±20 pF (at 100 kHz)
Input type: Unbalanced (Note: With the 3273 or 3273-50
*1
, the sensor
connector terminal is used together.)
Maximum rated voltage to earth: 30 Vrms or 60 VDC
Sensor connector terminal
(for power supply to measure
current)
4 channels can be connected.
GND: Common with the MEMORY HiCORDER in which the 8940 is
installed (Note: With the 3273 or 3273-50
*1
, the BNC terminal is used
together.)
Operational ranges for
temperature and humidity
Same as the MEMORY HiCORDER in which the 8940 is installed
Operating place Same as the MEMORY HiCORDER in which the 8940 is installed
Temperature and humidity
ranges for storage
Temperature: -10℃ to 50℃(14
Fto122
F)
Relative humidity: 80%RH maximum (with no condensation)
Effect of radiated radio-
frequency electromagnetic fiel
±5% f.s. at 3V/m
Dielectric strength One minute at 400 VAC between the 8940 and the main unit, and
between the 8940 and the input unit
Dimensions Approx. 170W×20H×148.5D mm (6.69"W×0.79"H×5.85"D)
(excluding projections)
Mass Approx. 300 g (10.6 oz.)
Standards applying EMC EN61326 ClassA
Safety EN61010
Pollution Degree 2, Measurement Category
(anticipated transient overvoltage: 330 V)
Options 9318 CONVERSION CABLE (for connection of a clamp-on sensor)
9319 CONVERSION CABLE (for connection of a clamp-on probe)
Compatible current sensors
and probe
9270, 9271, and 9272 CLAMP-ON SENSORs
9277, 9278 and 9279 UNIVERSAL CLAMP ON CTs
3273 , 3273-50
*1
CLAMP-ON PROBE
Accuracy at 23℃±5℃ (73
F±9
F), 35% to 80%RH after zero adjustment after
30-minute warming-up time. Accuracy guaranteed for 1 year.
General specifications
*1: When using the Model 3273-50 with the 8940, bear in mind that the maximum
input of the 3273-50 is 15 Arms.
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