21
last time is 20Ω.
*9. Clear Data
Press
MODE
key to enter the access mode of the stored data. Pressing
down
SET + MODE
combination key may automatically clear all the stored
data. That is, press down
SET
key while pressing down
MODE
key.
The display after a clearing operation is shown Figure 12.
In
HOLD
state, it is required to press down
POWER
key or
SET
key to
quit from
HOLD
state; then press
MODE
key to enter the access data mode,
and followed by pressing down
SET + MODE
combination key to clear all the
stored data.
In the setting state of alarm critical value, it is required to press down
POWER
key or
SET
key for 3 sec to quit from the setting state of alarm critical
value before pressing
MODE
key to switch to the access data mode; then
press down
SET + MODE
combination key to clear all the stored data
Note: "*" is limited to ETCR2000C.
VIII. Measurement Principle
1. Principle of Resistance Measurement
The basic principle of
ETCR2000
in the measurement of resistance is to measure the
loop resistance, as shown in the figure below. The jaw part of the Meter is comprised of
voltage coil and current coil. The voltage coil provides excitation signal, and will induce a
potential E on the measured loop. Under the effects of the potential E, the current I can
