Brymen BM251s User Manual page 14

Accessories: Test lead pair; batteries installed; user's manual; BKP60 banana plug type-K
thermocouple (models
Optional purchase accessories: USB interface kit BRUA-20X; Magnetic hanger BMH-01; BKB32
banana plug to type-K socket plug adaptor
Electrical Specification
Accuracy is given as +/- (% of reading digits + number of digits) or otherwise specified @ 23
5 C and less than 75% R.H.
o
True RMS Model 257s
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
50Hz ~ 400Hz
60.00mV, 600.0mV
6.000V, 60.00V, 600.0V,
1000V
CMRR: >60dB @ DC to 60Hz, Rs=1k
Input Impedance: 10M, 50 pF nominal
AutoCheck _ACV (model
TM
RANGE
50Hz/60Hz
1.000V ~ 1000V
AutoCheck Lo-Z ACV Threshold:
TM
AutoCheck Lo-Z ACV Input Impedance:
TM
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
600.0, 6.000K, 60.00K,
600.0K
6.000M
60.00M
Open Circuit Voltage: 0.45VDC typical
DC Voltage
252s, 255s & 257s
ACV & ACA accuracies are specified from 5 % to 100 % of range or
Accuracy
1.0% + 5d
255s & 257s
Accuracy
1.4% + 5d
> 1V nominal
Accuracy
0.5%+4d
0.7%+4d
1.2%+4d
only)
RANGE
60.00mV
600.0mV
6.000V, 60.00V, 600.0V,
1000V
NMRR: > 60dB @ 50Hz/60Hz
CMRR: > 100dB @ DC, 50Hz/60Hz; Rs=1k
Input Impedance: 10M, 50 pF nominal
only) AutoCheck
RANGE
1.000V ~ 1000V
AutoCheck
AutoCheck
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
100k
250k
375k
AutoCheck
RANGE
1)
000.0 ~ 60.00M
Open Circuit Voltage: 0.45VDC typical
AutoCheck
1)
_DCV (model 255s & 257s
TM
Lo-Z DCV Threshold:
TM
> +1.0VDC & < -1.0VDC nominal
Lo-Z DCV Input Impedance:
TM
@100V
@300V
@600V
@1000V
_Ohm (model 255s & 257s
TM
Ohm Threshold:
TM
< 10.00M nominal
13
C +/-
o
Accuracy
0.4%+5d
0.2%+3d
only)
Accuracy
1.3% + 3d
only)
Accuracy
1.2% + 10d