Technical specifications
100,000-count graphical multimeters 37
Technical specifications (cont’d)
Peak measurement
Pk+
Pk-
MTX 3281
MTX 3282
MTX 3283
Specifications valid from 20 % of the range in A, 10 % of the range in V
The value of the peak factor results from calculation: (Pk+ - Pk-) / 2 x Vrms
Additional error for 250 µs < t < 500 µs : 3 %
Measurement zero reset : by pressing the key .
SURV Function
(MIN, MAX, AVG)
Accuracy and rate: id. specifications Volt and Ampere measurements
MTX 3281, MTX 3282, MTX 3283
Resistive power W
Display of measurement in relative power in relation to a resistance reference
(W REF) adjustable from 1 to 10,000 Ω, factory-adjusted to 50 Ω.
The function performed is: (measured voltage)
2
/ W REF (unit W)
(measured current)
2
∗ W REF(unit W)
Ranges DC and AC
Resolution 100 µW
Accuracy 2 x accuracy in VDC or VAC (in %)
Protection 1000 Vrms
Power calculation
V x A
MTX 3282
MTX 3283
In AC and AC+DC voltage measurement : this calculation is limited to 400 Hz
The current measurement is always performed in AC+DC.
Accuracy (typical) : V measurement accuracy + Peak A measurement accuracy
The connection on the COM input must be short and of large diameter, in order to
limit the voltage drop which influences Volt measurement.
Duty ratio
DC+
DC-
MTX 3281
MTX 3282
MTX 3283
Display of the measurement in % of a logic signal (TTL, CMOS…)
DC+ Duty ratio = θ
DC- Duty ratio = T - θ
Resolution 0.01%
Minimum duration for θ 10 µs
Maximum duration for T 0.8 s
Minimum duration for T 200 µs
Nominal range 5 to 90% typical
Sensitivity (10 V range) > 30% of the Freq range < 1 kHz
> 50% of the Freq range > 1 kHz
Absolute error on the duty
ratio, expressed in absolute % 0.05% + 0.0001 / T [t in s] Freq < 1 kHz
0.1% + 0.0005 / T [t in s] Freq > 1 kHz
Additional absolute error 0.1 x C/P
(slope at switching to zero) C = range in V or in A
(for range 1000 V, C = 5000)
P = slope in V/s, A/s
Protection 1000 Vrms
Pulse counting
CNT+
CNT-
MTX 3282
MTX 3283
Depending on triggering conditions of frequency meter.
Minimum pulse duration 5 µs
Counting up to 99999
Triggering threshold 10 % of range except range 1000 V
AC
This threshold is: positive in
, negative in
Counter reset to zero by pressing the key .
For negative events, reverse the cables.
Secondary values
Peak ranges
Additional error
Protection
Peak V t > 250 µs 100 mV to 1000 V 3% ± 50D
Peak A t > 250 µs 1000 µA to 20 A 4% ± 50D
1000 Vrms
or 10 Arms
T
θ
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