Fluke 1736 User Manual

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Users Manual
8
Thin-Flexi Current Probe
The Thin-Flexi Current Probe works on the Rogowski coil
(R-coil) principle that is a toroid of wire used to measure
an alternating current through a wire encircled by the
toroid. See Figure 4.
hcf028.eps
Figure 4. R-Coil Operation Principle
The R-coil has many advantages over other types of
current transformers:
• It is not a closed loop. The second terminal is passed
back through the center of the toroid core (commonly a
plastic or rubber tube) and connected along the first
terminal. This allows the coil to be open-ended,
flexible, and able to be wrapped around a live
conductor without disturbing it.
• It has an air core rather than an iron core. It has a low
inductance and can respond to fast-changing currents.
• Because it has no iron core to saturate, it is highly
linear even when subjected to large currents, such as
those used in electric power transmission or pulsed-
power applications.
A correctly formed R-coil, with equally spaced windings, is
largely immune to electromagnetic interference.
i(t)
v(t)
A
r
10 k R3
330 k R1
10 nF C1
LF347
UI:A
1
GND
2
114
3
V
in
V
out

Fluke 1736 Specifications

General

Product type	Three phase power measurement logger
Cable lock slot type	Kensington
International Protection (IP) code	IP50
Operating altitude	0 - 4000 m
Non-operating altitude	0 - 12000 m
Storage temperature (T-T)	-20 - 60 °C
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Built-in display	Yes
Display diagonal	4.3 \
Touchscreen type	Resistive
Display resolution	480 x 272 pixels
Display technology	TFT
Efficiency	68.2 %
Battery life	4 h
Charging time	6 h
Battery voltage	3.7 V
Input frequency	50/60 Hz
Battery capacity	9.25 Wh
Power consumption (max)	50 VA
Battery life (power save mode)	5.5 h

Weight and Dimensions

Depth	55 mm
Width	198 mm
Height	167 mm
Weight	1100 g
Power adapter weight	400 g
Power supply dimensions (WxDxH)	130 x 45 x 130 mm