Elma Instruments 5706445410286, Руководство пользователя

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Elma BM 251s-257s side 32
Electrical specifications
Accuracy is given as +/- (% of reading number of digits) or otherwise specified @ 23
o
C +/- 5
o
C
and less than 75% R.H.
True RMS model BM257s ACV & ACA accuracies are specified from 5 % to 100 % of range or otherwise
specified. Maximum Crest Factor <3:1 at full scale & <6:1 at half scale, and with frequency components
fall within the meter specified frequency bandwidth for non-sinusoidal waveforms
AC Voltage
RANGE
Accuracy
50Hz ~ 400Hz
60.00mV, 600.0mV
1.0% + 5d
6.000V, 60.00V, 600.0V, 1000V
CMRR: >60dB @ DC to 60Hz, Rs=1k

-Input Impedance: 10M

, 50 pF nominal
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TM
_ACV (BM257s only)
RANGE Accuracy
50Hz/60Hz
1.000V ~ 1000V
1.4% + 5d
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TM
Lo-Z ACV Threshold: > 1V nominal
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Lo-Z ACV Input Impedance:
Initially approx. 2.5k

, 120pF nominal; Impedance increases abruptly within a fraction of a second as
display voltage is above 50V (typical). Ended up impedances vs display voltages typically are:
15k

@100V 100k

@300V 250k

@600V 375k

@1000V
Ohm
RANGE
Accuracy
600.0

, 6.000K

, 60.00K

, 600.0K

0.5%+4d
6.000M

0.7%+4d
60.00M

1.2%+4d
Open Circuit Voltage: 0.45VDC typical
DC Voltage
RANGE
Accuracy
60,00mV 0,4%+5d
600.0mV
0.2%+3d
6.000V, 60.00V, 600.0V, 1000V
NMRR: > 60dB @ 50Hz/60Hz
CMRR: > 100dB @ DC, 50Hz/60Hz; Rs=1k

Input Impedance: 10M

, 50 pF nominal
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TM
_DCV (BM257s only)
RANGE Accuracy
1.000V ~ 1000V 1.3% + 3d
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Lo-Z DCV Threshold:
> +1.0VDC & < -1.0VDC nominal
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TM
Lo-Z DCV Input Impedance:
Initially approx. 2.5k

, 120pF nominal; Impedance increases abruptly within a fraction of a second as
display voltage is above 50V (typical). Ended up impedances vs display voltages typically are:
15k

@100V 100k

@300V 250k

@600V 375k

@1000V