MEATEST, s.r.o.
M-142 Multifunction Calibrator
User Manual v54
117
Example:
Set parameters:
U = 100 V, I = 10 A, cos
= 0.5, f = 50 Hz, displayed value of active power in W
Output voltage uncertainty:
dU = 0.018 % value + 0.010 % range = 0.028 %
Output current uncertainty:
dI = 0.10 % value + 0.06 % range = 0.16 %
Uncertainty due the set phase shift:
PF 0.5 corresponds phase shift 60 °
dPF = (1 – cos (60+0.15)/cos 60) * 100 = (1 – 0.4977/0.5) * 100 = 0.45 %
Output power uncertainty:
dP =
( 0.028
2
+ 0.16
2
+ 0.45
2
+ 0.03
2
) = 0.48 %
POWER FACTOR (PF)
range:
-1.0 to +1.0
PF uncertainty can be calculated for any set value of output voltage, current and PF from following formula:
dPF = (1 – cos (
+d
)/cos
) * 100
[%]
where
is set phase shift between voltage and current
d
is uncertainty of set phase shift form the above table
AC ENERGY uncertainty
It depends on set value of voltage, current, time and PF. The best uncertainty is 0.07% for apparent energy.
Frequency
summary range:
0.1 Hz to 20 MHz
frequency uncertainty:
0.005 %
frequency resolution:
6 digit, minimum step 0.001Hz
output:
BNC connector located on the front panel
modes:
- PWM square wave output with calibrated duty cycle ratio, frequency and
amplitude
- HF square wave output with calibrated frequency and amplitude
Mode PWM
frequency range:
0.1 Hz to 100 kHz
voltage range:
1 mV to 10 V
duty cycle ratio range:
0.01 to 0.99
wave form:
square, symmetrical– positive – negative
duty cycle ratio uncertainty:
0.05 %
signal noise (20 Hz – 1 MHz):
< 2 mV from 0.1Hz to 10 kHz
< 10 mV from 10kHz to 100 kHz
Amplitude uncertainty (average top/bottom square signal level)
range
% value + V
% value + mV
0.1 Hz to 10 kHz
10kHz to 100 kHz
1.00000 mV – 20.00000 mV
0.2 + 0.02 mV
0.2 + 0.1 mV
20.0001 mV – 200.0000 mV
0.1 + 0.02 mV
0.1 + 0.1 mV
0.200001 mV – 2.000000 V
0.1 + 0.02 mV
0.1 + 0.1 mV
2.00001 V – 10.00000 V
0.1 + 0.02 mV
0.1 + 0.1 mV
Mode HF
frequency range:
0.1 Hz to 20 MHz
output impedance:
50
wave form:
square symmetrical, duty cycle ratio 1:1
amplitude:
4 V
pk-pk
output amplitude range:
0, -10, -20, -30 dB +/- 1 dB
amplitude uncertainty:
10 %
rise/fall time:
< 3 ns
