РА1.007.001РЭ-001
12
PARMA Ltd.
4.7.2 Design and operation of the device
4.7.2.1
Structure diagram of the device is shown on fig. 2.
Figure 2. Structural diagram of the device
to battery
to network
+5 V
–5 V
1
13
14
5
-7 V +7
V
3
1
2
F
CPU
F
7
11
10
1
8
6
4
12
display
9
Ic
Uc
Ub
Ia
Ua
Т
10 с
РА1.007.001РЭ-001
17
PARMA Ltd.
of display will indicate the value of phase shift between Iref current and volt-
age applied to measurement channel (Umeasuring). If there is current in Im
channel either, the device will show both phase shifts.
6.2.6.3
Prefix of current-voltage phase shift:
iu=;
Figure 9
6.2.7 Measurement of voltage-voltage phase shift
6.2.7.1
To measure voltage-voltage phase shift, apply voltage to
Ureference and Umeasuring terminals (see fig. 10).
6.2.7.2
Since the moment of signal appearance on Ureference
terminals the device will be switched to the proper mode automatically.
6.2.7.3
The upper line of display will indicate the value of phase
shift between Ureference voltage and voltage applied to measurement chan-
nel (Umeasuring). Read indication from the upper line of the display.
6.2.7.4
Prefix of current-voltage phase shift:
uu=;
Figure 10
6.2.8 Measurement of voltage-current phase shift
6.2.8.1
To measure voltage-current phase shift, apply voltage to
terminals, named Ureference, connect measuring clamp to the connector
named Imeasuring (see fig. 11).
6.2.8.2
From the moment of signal appearance on the terminals
Ureference the device will transfer to required mode automatically.
6.2.8.3
The lower line of display will indicate the value of phase
shift between Ureference voltage and Imeasuring current. If there is voltage
φiu= 30° L
220.0V
φii= 30° С 999 mА
180°
270°
0°
90°
Ic
Ia
30°
–30°
Uc
φuu= 30° L
220.0V
φui= ?°
0 mА
180°
270°
0°
90°
Ua
–30°
Uc
