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Elma BM 251-252-255-257
side 49
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
AutoCheck
TM
_DCV (BM255 & BM257 only)
RANGE
Accuracy
1.000V ~ 1000V 1.3% + 3d
AutoCheck
TM
Lo-Z DCV Threshold:
> +1.0VDC & < -1.0VDC nominal
AutoCheck
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
AutoCheck
TM
_Ohm (BM255 & BM257 only)
RANGE
1)
Accuracy
00.00 ~ 60.00M
1.2% + 10d
Open Circuit Voltage: 0.45VDC typical
1)
AutoCheck
TM
Ohm Threshold:
< 10.00M nominal
CREST Mode (BM255 & BM257 only)
Accuracy: Specified accuracy plus 150 digits for changes > 5ms in duration
RECORD Mode (BM255 & BM257 only)
Accuracy: Specified accuracy plus 100 digits for changes > 100ms in duration
Capacitance (BM252, BM255 & BM257 only)
RANGE Accuracy
60.00nF, 600.0nF 2.0%+5d
6.000µF, 60.00µF, 600.0µF
1.5%+5d
3000µF
2.0%+5d
Accuracies with film capacitor or better
49


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