MR8740T_Quick guide_eng_20191016H.pdf - 第123页
11 7 Specications of the Options Maximum rated voltage to earth 300 V AC, DC (between each input channel and the enclosure, between any two of input channels) Measurement category II, anticipated transient overvoltage: …
116
Specications of the Options
Model MR8990 Digital Voltmeter Unit
Conditions of guaranteed accuracy
Specied under the following conditions: installed in a Memory HiCorder and operated at 23°C ±5°C (73°F ±9°F) in
the humidity range of 20% to 80% RH after a half-hour (at least) warm-up and execution of calibration.
Product warranty
period
3 years
Guaranteed accuracy
period
1 year
Number of input
channels
2 channels
Measurement item DC voltage
Measurement range
Measurement range Effective input range*
Maximum
resolution
Input
resistance
100 mV f.s. −120 mV to 120 mV 0.1 µV 100 M
Ω
or more
1 V f.s. −1200 mV to 1200 mV 1 µV
10 V f.s. −12 V to 12 V 10 µV
100 V f.s. −120 V to 120 V 100 µV 10 M
Ω
±5%
1000 V f.s. −500 V to 500 V 1 mV
*: Guaranteed range of measurement accuracy
Measurement
accuracy
Measurement range NPLC: Less than 1 NPLC: 1 or more
100 mV f.s. ±0.01% rdg. ±0.015% f.s. ±0.01% rdg. ±0.01% f.s.
1 V f.s.
±0.01% rdg. ±0.0025% f.s.
10 V f.s.
100 V f.s.
±0.025% rdg. ±0.0025% f.s.
1000 V f.s.
Temperature
characteristics
±(0.002% rdg. + 0.00025% f.s.)/°C
A/D conversion
measurement
method
Delta-sigma modulation method
Integration time
Power frequency Integration time
50 Hz 20 ms × NPLC
60 Hz 16.67 ms × NPLC
NPLC: Settable from 0.1 to 0.9 (in 0.1 increments), 1 to 9 (in one increments), and 10 to
100 (in 10 increments)
Response time Within [2 ms + 2 × (integration time)] (rising from − f.s. to +f.s., and falling from +f.s. to −f.s.)
High-speed
response
On/Off
Common-mode
rejection ratio
100 dB or more (at 50 Hz / 60 Hz, a signal source resistance of 100
Ω
or less)
Input type Unbalanced input (oating)
Input terminals Banana jacks
Maximum input
voltage
500 V DC
117
Specications of the Options
Maximum rated
voltage to earth
300 V AC, DC (between each input channel and the enclosure, between any two of input
channels)
Measurement category II, anticipated transient overvoltage: 2500 V
Operating
temperature and
humidity
Consistent with the specications of Memory HiCorder in which Model MR8990 is installed.
Operating
environment
Consistent with the specications of Memory HiCorder in which Model MR8990 is installed.
Storage temperature
and humidity
−10°C to 50°C (14°F to 122°F), 80% RH or less (no condensation)
Dimensions Approx. 106W × 19.8H × 196.5D mm (4.17″W × 0.78″H × 7.74″D)
Mass Approx. 260 g (9.2 oz.)
Effect of radiated
radio-frequency
electromagnetic eld
±0.1% f.s. (max.) at 3 V/m (with the 100 mV f.s. range)
Standards Safety: EN61010
EMC: EN61326 Class A
Options Model L2200 Test Lead
5
Specications
118
Specications of the Options
Model U8974 High Voltage Unit
Conditions of guaranteed accuracy
Specied under the following conditions: installed in a Memory HiCorder and operated at 23°C ±5°C (73°F ±9°F) in
the humidity range of 20% to 80% RH after a half-hour (at least) warm-up and execution of zero-adjustment.
Product warranty
period
3 years
Guaranteed accuracy
period
1 year
Number of input
channels
2 channels
Measurement
functions
Instantaneous value, RMS value (Each channel can have a different setting.)
Measurement range 4, 10, 20, 40, 100, 200, 400, 1000 V f.s. (DC mode)
10, 20, 40, 100, 200, 400, 1000 V f.s. (RMS mode)
Measurement
accuracy
±0.25% f.s. (with the lter set at 5 Hz)
RMS measurement
accuracy
±1.5% f.s. (DC, 30 Hz or higher but lower than 1 kHz, sine wave, response time setting:
Slow)
±3% f.s. (1 kHz to 10 kHz, sine wave)
Crest factor: 2 (sine wave, a peak voltage of up to 1000 V)
RMS measurement
response time
Fast: 150 ms (rising from 0% of f.s. to 90% of f.s.)
Normal: 500 ms (rising from 0% of f.s. to 90% of f.s.)
Slow: 2.5 s (rising from 0% of f.s. to 90% of f.s.)
Temperature
characteristics
±0.05% f.s./°C
Frequency
characteristics
DC to 100 kHz, −3 dB
Noise 30 mV p-p (typ.), 50 mV p-p (max.); with the highest sensitivity range and the terminals of
each input connector connected with each other
Common mode
rejection ratio
80 dB or more (at 50 Hz / 60 Hz, with input terminals connected with each other)
Low-pass lter Off, 5 ±50%, 50 ±50%, 500 ±50%, 5 k ±50%, 50 k ±50% (Hz); −3 dB
Input type Balanced input (oating)
Input coupling DC/GND
Input resistance 4 M
Ω
±1%
Input capacitance 5 pF or less (at 100 kHz)
A/D resolution 16 bits
Maximum sampling
rate
1 MS/s
Input terminals Banana jacks
Maximum input
voltage
1000 V DC, 700 V AC
Maximum rated
voltage to earth
1000 V AC, DC, Measurement category III; 600 V AC, DC, Measurement category IV
(between each input channel and the enclosure, between any two of input channels)
Anticipated transient overvoltage: 8000 V
Operating
temperature and
humidity
Consistent with the specications of Memory HiCorder in which Model U8974 is installed.
Operating
environment
Consistent with the specications of Memory HiCorder in which Model U8974 is installed.