Gossen MetraWatt METRAHIT ENERGY TRMS System Multimeter Operating Instructions Manual page 80

Technical Data
Intrinsic Uncertainty and Frequency Influence for Power and Energy
Measurement
Measured Measuring
Quantity Range
U  0.1 x Umax
Voltage,
and U  0.15 V
auxiliary display
Current,
I  0.01 x Imax
auxiliary display
Power factor
Apparent power
|PF|  0.4
Active power
|PF| <0.4
|PF|  0.8
Reactive power
1
Not applicable in mV range
Display range
– Current and voltage: 6000 digits
– Apparent, reactive and active power: 36,000 digits
– Power factor: 100 digits
Intrinsic error: stable sinusoidal voltage, stable sinusoidal current, mean
voltage value: max. 10% amplitude. U > 9% of the upper range limit is
usually the case during normal operation due to auto-ranging, except in
the smallest range.
Bandwidth up to 1 kHz; signal components of higher frequency are clip-
ped by input filters.
Note:
Power is measured with a separate measurement circuit: As a result,
specified accuracies for voltage and current measurement do not
correspond with the specified values for the respective measuring
functions. Principally, DC voltage linearity is only assured with voltages
of 0.15 V or  10% of the upper range limit.
80
Intrinsic Uncertainty ±(... % rdg + ... d)
DC 10 Hz ... 65 Hz 65 Hz ... 1 kHz
0.5 + 10 0.3 + 10 0.4 + 10
0.2 + 5 0.1 + 5 0.9 + 10
1 d 1 d + 1 d
1.0 + 20 0.4 + 20 1.3 + 20
1.0 + 20 0.4 + 20 1.5 + 20
— 1.0 + 20 3.0 + 20
— 1.0 + 20 3.0 + 20
Additional deviation for U, I during power measurement
with higher crest factor, f = 0 ... 65 Hz:
CF = 2: -0.3% rdg., CF = 3: -0.9% rdg.,
CF = 4: -1.5% rdg., CF = 5: -2.5% rdg.
1
Square-cycle signal 10 to 65 Hz to U or I:
additional intrinsic uncertainty of +0% / -0.7% rdg.
Mains Monitoring / Mains Disturbance Recording
1
Type of Measuring Range Resolution
1
Disturbance
1
1
Over/ 6 ... 600 V
1
undervoltage
Dip/swell 6 ... 600 V
Peak 6 ... 600 V
Transient 200 ... 1000 V *
* Absolute value of the transients is limited to approximately 1000 V by
input protection.
Internal clock
Time format
Resolution
Accuracy
Temp. influence
Reference Conditions
Ambient temperature
Relative humidity
Meas. quantity frequency
Meas. quantity waveform
Battery voltage
Intrinsic Uncertainty under
Reference Conditions with
(display) Fixed Frequency of 50/60 Hz
60,000
digits
6000 digits ±(1% rdg. + 1% MR)
6000 digits ±(1% rdg. + 2% MR)
 50 V
10 V
DD.MM.YYYY hh:mm:ss
0.1 s
1 min./month
50 ppm/K
+23 C 2 K
40 ... 75%
(no condensation allowed)
45 ... 65 Hz
Sine
1.8 V ... 3.2 V
GMC-I Messtechnik GmbH
Pulse Time
 1 half-cycle
 1 ms
0.5 ... 5 s