Accuracy is given as +/- (% of reading digits + number of digits) or otherwise specified @ 23o C +/- 5o 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 & AC+DC Voltage
Function | RANGE | Accuracy |
50Hz ~ 60Hz |
mV | 60.00mV, 600.0mV | 0.5% + 3d |
V | 9.999V, 99.99V, 999.9V |
40Hz ~ 500Hz |
mV | 60.00mV, 600.0mV | 0.8% + 4d |
V | 9.999V, 99.99V | 1.0%+4d |
999.9V | 2.0%+4d |
500Hz ~ 1kHz |
mV | 60.00mV, 600.0mV | 2.0% + 3d |
V | 9.999V, 99.99V | 1.0%+4d |
999.9V | 2.0%+4d |
1kHz ~ 3kHz |
mV | 60.00mV, 600.0mV | 2%+3d |
V | 9.999V, 99.99V, 999.9V | 3.0%+4d |
3kHz ~ 20kHz |
mV | 60.00mV 1), 600.0mV 1) | 2%+3d |
V | 9.999V, 99.99V | 3dB |
999.9V | Unspec’d |
1) Specificied from 30% to 100% of range.
CMRR: >60dB @ DC to 60Hz, Rs=1k W
Input Impedance: 10M W , 50pF nominal (80pF nominal for 600mV range)
Residual reading less than 5 digits with test leads shorted.
AutoCheckTM (ACV)
RANGE 1) | Accuracy |
50Hz ~ 60Hz |
9.999V, 99.99V, 999.9V | 1.0%+4d |
Lo-Z ACV Threshold:
> 3VAC (50/60Hz) nominal
Lo-Z ACV Input Impedance:
Initially approx. 3.0k W , 150pF 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:
18k W @100V 125k W @ 300V
320k W @ 600V 460k W @ 1000V
dBm
At 600 W , -11.76dBm to 54.25dBm,
Accuracy: ± 0.25dB + 2d (@40Hz -- 20kHz)
Input Impedance: 10M W , 50pF nominal
Selectable reference impedance of 4, 8, 16, 32, 50, 75, 93, 110, 125, 135, 150, 200,
250, 300, 500, 600, 800, 900, 1000, 1200 W
DC Voltage
Function | RANGE | Accuracy |
mV | 60.00mV | 0.12%+2d |
600.0mV | 0.06%+2d |
V | 9.999V, 99.99V, 999.9V | 0.08%+2d |
NMRR: >60dB @ 50/60Hz
CMRR: >110dB @ DC, 50/60Hz, Rs=1k W
Input Impedance: 10M W , 50pF nominal (80pF nominal for 600mV range)
AutoCheckTM (DCV)
RANGE | Accuracy |
9.999V, 99.99V, 999.9V | 0.5%+3d |
Lo-Z DCV Threshold:
> +1.5VDC or < -1.0VDC nominal
Lo-Z DCV Input Impedance:
Initially approx. 3.0k W , 165pF 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:
18k W @100V 125k W @ 300V
320k W @ 600V 500k W @ 1000V
Ohms
RANGE | Accuracy |
600.0 W , 6.000k W , 60.00k W , 600.0k W | 0.1%+3d |
6.000M W | 0.4%+3d |
60.00M W | 1.5%+5d |
99.99nS | 0.8%+10d |
Open Circuit Voltage: < 1.2VDC (< 1.0VDC for 60M W range)
AutoCheckTM (Ohms)
RANGE | Accuracy |
600.0 W , 6.000k W , 60.00k W , 600.0k W | 0.5%+4d |
6.000M W | 0.8%+3d |
60.00M W | 2.0%+5d |
Open Circuit Voltage: < 1.2VDC (< 1.0VDC for 60M W range)
Audible Continuity Tester
Audible threshold: between 20 W and 300 W ; Response time < 100 m s
Diode Tester
RANGE | Accuracy |
2.000V | 1.0%+1d |
Test Current (Typically): 0.4mA
Open Circuit Voltage: < 3.5 VDC
Temperature
RANGE | Accuracy |
-50oC to 1000oC | 0.3%+2oC |
-58oF to 1832oF | 0.3%+5oF |
Type-K thermocouple range & accuracy not included
Capacitance
RANGE | Accuracy 1) |
60.00nF, 600.0nF | 0.8% + 3d |
6.000 m F | 1.0% + 3d |
60.00 m F | 2.0% + 3d |
600.0 m F 2) | 3.5% + 5d |
6.000mF 2) | 5.0% + 5d |
25.00mF 2) | 6.5% + 5d |
1) Accuracies with film capacitor or better
2) In manual-ranging mode, measurements not specified below 50.0 mF, 0.54mF and
5.4mF for 600.0 mF, 6.000mF and 25.00mF ranges respectively
AC & AC+DC Current
RANGE | Accuracy | Burden voltage |
BM82x 2) | BM52y 3) |
50Hz ~ 60Hz |
600.0 m A, 6000 mA | 0.6%+3d | 0.08mV/ m A | 0.08mV/ m A |
60.00mA | 1.5mV/mA | 2.1mV/mA |
600.0mA | 1.0%+3d |
6.000A , 10.00A 1) | 0.8%+6d | 0.04V/A | 0.02V/A |
40Hz ~ 1kHz |
600.0 m A, 6000 mA | 0.8%+4d | 0.08mV/ m A | 0.08mV/ m A |
60.00mA | 1.5mV/mA | 2.1mV/mA |
600.0mA | 1.0%+4d |
6.000A , 10.00A 1) | 0.8%+6d | 0.04V/A | 0.02V/A |
1) 10A continuous, > 10A to 15A (to 20A for BM521 & BM525) for 30 second max with
5 minutes cool down interval
2) x=1, 2, 7 & 9; Model 821, 822, 827 & 829
3) y=1 & 5; Model 521 & 525
DC Current
RANGE | Accuracy | Burden voltage |
BM82x 2) | BM52y 3) |
600.0 m A, 6000 mA | 0.2%+4d | 0.08mV/ m A | 0.08mV/ m A |
60.00mA, 600.0mA | 1.5mV/mA | 2.1mV/mA |
6.000A , 10.00A 1) | 0.04V/A | 0.02V/A |
1) 10A continuous, > 10A to 15A (to 20A for BM521 & BM525) for 30 second max with
5 minutes cool down interval
2) x=1, 2, 7 & 9; Model 821, 822, 827 & 829
3) y=1 & 5; Model 521 & 525
Line Level Frequency (Hz)
Function Range | Frequency | Sensitivity (Sine RMS) |
AC 60.00mV | 15.00 ~ 50.00kHz | 40mV |
AC 600.0mV | 60mV |
AC 9.999V | 15.00 ~ 10.00kHz | 2.5V |
AC 99.99V | 25V |
AC 999.9V | 100V |
AC 600.0 mA | 15.00 ~ 3.000kHz | 45uA |
AC 6000 mA | 600uA |
AC 60.00mA | 40mA |
AC 600.0mA | 60mA |
AC 6.000A | 4A |
AC 10.00A | 6A |
Accuracy: 0.04%+4d
Crest mode (Instantaneous Peak Hold)
Accuracy: Specified accuracy adds 250 digits for changes > 1.0 ms in duration
Record mode
Accuracy: Specified accuracy adds 10 digits for changes > 100 ms in duration
Logic Level Frequency ( Hz) & Duty Cycle (D%)
@ DCmV Function | Range | Accuracy 1) |
Frequency | 5.00Hz ~ 1.000MHz | 0.004%+4d |
Duty Cycle | 0.00% ~ 100.0% | 3d/kHz+2d 2) |
1) Sensitivity: 2.5Vp (Square wave) for 3V & 5V Logic Family
2) Specified Frequency: 5Hz ~ 10kHz
Non-Contact EF-Detection
Typical Voltage | Bar Graph Indication |
20V (tolerance:10V~36V) | - |
55V (tolerance: 23V ~ 83V) | -- |
1 10V (tolerance: 59V ~ 165V) | --- |
220V (tolerance: 124V ~ 330V) | ---- |
440V (tolerance: > 250V) | ----- |
Indication: Bar graph segments & audible beep tones proportional to the field strength
Detection Frequency: 50/60Hz
Detection Antenna: Top end of the meter
Probe-Contact EF-Detection:
For more precise indication of live wires, such as distinguishing between live and
ground connections, use the Red (+) test probe for direct contact measurements.