User Guide

1312
The next memory function key,
MR/∆M, serves two purposes:
- The first entry (by pressing
this key once) enables the re-
call of the previously stored
temperature reading. If no data
is found, "_ _ _" will be dis-
played. In this mode of opera-
tion, the display indicator "M"
is kept static.
- The "∆M" display (by press-
ing MR/∆M twice) indicates the
constant updated discrepancy
between the memory content
and the measured value in a continuous mea-
suring process. Calculation is performed by
subtracting the measured value from the memory
content, i.e.:
∆M = (M-T)
where M = memory content
T = measured temperature
A negative result therefore represents a lower
memory value.
By pressing the MR/∆M key
once again, the user exits from
the memory mode.
LOW BATTERY DETECTION
In order to avoid erroneous measurements be-
ing taken due to low voltage, the instrument
shuts itself down completely when the batteries
run low. The user is also
prompted to change them by
"Eb" on the LCD.
MR
∆M
M
∆M
MR
∆M
The flashing "HI •))" and "LO •))"
alarm indicators request the
user to opt for the set mode.
Select the HI key to enter the
set mode for high temperature
point or the LO key for the low
temperature limit. If the HI key
is chosen, the low alarm indi-
cator is switched off and the
"HI" indicator appears in the
top right corner of the LCD.
Enter the set point value using
the * and + keys. Holding the
key down enables rapid change.
Exit from the high alarm limit
setting by pressing the SET
key for a second time. The user
may now proceed to set the
low alarm limit or return to the
measurement mode by press-
ing the SET key again. The setting of low
temperature limit works in a similar manner.
MEMORY MODE (HI 9053 and HI 9055 only)
There are two modes of operation.
The first is the memory & hold
function which is activated by
the MEM HOLD key. The mea-
sured temperature is captured
into memory and frozen on the
display when this function key
is pressed. The memory con-
tent will be overridden each
time the memory & hold func-
tion is activated. A blinking "M"
indicates the operating mode.
By pressing the same key, the
display freeze is released and
the meter returns to its regular
operating mode.
HI •)
)
LO •)
)
SET
MEM
HOLD
M
HI LO
HI LO
HI