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4.7. SENSORS AND RATIOS
NOTE: The ratios cannot be changed if the instrument is recording, metering energy, or searching for transients, alarms,
and/or inrush current acquisitions.
4.7.1. CURRENT SENSORS AND RATIOS
Pressing
Probes and Ratios at the Configuration menu displays a menu for defining the current sensors and ratios. It
automatically displays the current sensor models detected by the instrument. If a sensor is detected but not a supported type, an
error message is displayed.
For a 3-wire three-phase set-up where only two of the three current sensors required are connected, if these two sensors are of the
same type and have the same ratio, the instrument simulates the third sensor by assuming the same characteristics as the other two.
The third sensor will be shown in the list as being simulated, or impossible to simulate otherwise.
Supported current sensors are:
If an MN193 clamp (5A range), an Adapter, an AmpFlex
range, or of the sensitivity is proposed automatically.
Use the arrow buttons (, , , ) to define the transformation ratios between the primary current (1A to 60,000A) and the secondary
current (1A, 2A or 5A), then validate with the
The primary current cannot be less than the secondary current.
4.7.2. VOLTAGE RATIOS
The Sensors and Ratios menu also lets you set voltage ratios. The option for doing this is either U (for setups without neutral) or V (for
setups with neutral). Select the displayed option from the Current Ratios and Current Sensors menu (Figure 4-13).
Ratios are phase-to-neutral voltage ratios when there is a neutral, and phase-to-phase voltage ratios when there is not. The ratios
settings can be different or the same for all or for some channels.
Figure 4-13
MN93 clamp: 200 A.
MN193 clamp: 100 A or 5 A.
SR193 clamp: 1000 A.
J93 clamp : 3500 A.
AmpFlex
: 100, 6500 or 10000 A.
®
MiniFlex
: 100 or 6500 A.
®
MR193 clamp: 1000 A.
SL261 clamp: 100 A (sensitivity 10 mV/A).
SL261 clamp: 10 A (sensitivity 100 mV/A).
Three phase adapter: 5 A.
, a MiniFlex
, or an SL261 clamp is used, adjustment of the ratio, of the
®
®
button.
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