Brymen BM252 - Page 14

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Accessories: Test lead pair; batteries installed; user’s manual; BKP60 banana plug type-K
thermocouple (model 252, 255 & 257 only)
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
o
C +/-
5
o
C and less than 75% R.H.
True RMS model BM257 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
AutoCheck
TM
_ACV (model 255 & 257 only)
RANGE
Accuracy
50Hz/60Hz
1.000V ~ 1000V
1.4
%
+
5
d
AutoCheck
TM
Lo-Z ACV Threshold:
> 1V nominal
AutoCheck
TM
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
%+
5
d
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 (model 255 & 257 only)
RANGE
Accuracy
1.000V ~ 1000V
1.3
%
+
3
d
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 (model 255 & 257 only)
RANGE
1)
Accuracy
000
.
0

~ 6
0
.
00M

1.2
%
+
10
d
Open Circuit Voltage: 0.45VDC typical
1)
AutoCheck
TM
Ohm Threshold:
< 10.00M nominal