18
17
• Connect the black test probe to ground and the red test
probe to the second phase (T or L2).
• Using the trigger to open the jaws, fully enclose the phase
(T or L2) within the clamp.
• Release the trigger and be sure that the jaws have closed
completely.
• Wait until the reading is stable, and press the READ NEXT
button to capture the reading, storing the data in memory.
• The power clamp processes the two sets of data and calcu-
lates the true power (kW) of the system, which is shown on
the main display, and the power factor (PF), which is shown
on the upper display. RST is shown on the LCD display to
indicate that this is a measurement of the total system.
• Pressing the 3
φ
KVAR KVA button toggles to display the
apparent power (kVA) of the system, which is shown on the
main display, and the reactive power (kVAR), which is
shown on the upper display.
• Pressing the READ NEXT button clears the stored data from
memory and readies the power clamp for another single
phase 3-wire calculation.
3
φ
4W AC+DC Power Measurements
Kilowatt Range
Voltage/Current
(AC+DC True Power) Resolution Accuracy
Range
0-99.99kW
0.01kW
±(2.0% +0.05) 600VAC, 800VDC
100-999.9kW
0.1kW
2000A AC/DC
1000-1200kW
1kW
±(2.0% +5)
Power Factor 0.2-1.0 for 1
φ
2W, 1
φ
3W, 3
φ
3W, and 3
φ
4W
In a three phase 4-wire system, the 61-802 power clamp mea-
sures the true power (kW), power factor (PF), apparent power
(kVA), and reactive power (kVAR) of the system. These values
are calculated based on the formulas
kW
3
φ
4W
= kW
3
φ
4W
= kW
R(L1)
+ kW
S(L2)
+ kW
T(L3)
PF
3
φ
4W
=
kVA
3
φ
4W
=
kVAR
3
φ
4W
= kVAR
R(L1)
+ kVAR
S(L2)
+ kVAR
(TL3)
To Measure AC+DC Power Measurements in a three
phase 4-wire system
• Set rotary switch to 3
φ
4W without jaws clamping onto any
wire.
• The LCD display will show a flashing R to indicate that the
meter is ready for the first measurement.
• If the watt reading is not zero, press the DC A/W ZERO but-
ton once to zero out the watt reading.
• Insert the black test lead into the COM terminal and the red
test lead into the + terminal.
kW 3
φ
4W
kVA 3
φ
4W
kW
2
3
φ
4W
+ kVAR
2
3
φ
4W