Operation Manual

12 GMC-I Messtechnik GMBH
6 Measured Value Storage
The METRA HIT27EX provides two entirely different
options for storing data:
• Measured Value Memory – DATA Key Function:
Each time the DATA key is pressed and a measuring
point is contacted, a measured value is stored (see
chapter 6.1).
• Memory Mode Operation – STORE Menu Function:
After activating the STORE menu function, all mea-
sured values are saved in accordance with the
selected sampling rate. Memory mode operation is
ended manually using the same menu function, see
chapter 8.2.
In both cases, saved measured values can be read out
with the help of METRAwin

10 PC software (as of version
5.22). However, read-out is only possible if a IR adapter
(BD232 or USB-HIT) has been plugged into the METRA
HIT27EX and connected to the PC with an interface cable
(see Data Interface page 29).
6.1 Measured Value Storage – Key Function “DATA”
Measured values can be automatically “frozen” with the
DATA hold function. This is useful when, for example, con-
tacting the measuring points with the test probes requires
your full attention.
Preparation of Measurement
Memory should be cleared before starting a measurement
series with the DATA key function.
This assures, on the one hand, that adequate memory
capacity is available and, on the other hand, that only data
from the last measurement series are read out in a contigu-
ous fashion. Check current memory occupancy to this
end: INFO MEMO/OCCUP
Clear memory if required: MEMO CLEAr.
Performing Measurements
➭ Press the DATA key.
The message data blinks and indicates readiness for
acquiring the first measured value.
➭ Contact the measuring point as described in chapter
7.3.
After applying the test probes to the measuring point:
– the green LED OK indicates: safe measurement connection.
– The initially acquired value is transferred to the main
display where it remains stored. This is acknowledged
by two successive acoustic signals.
„MAN“ (and, additionally, „ZERO“ in the M measuring
ranges) is displayed simultaneously and indicates that
the measuring range is now fixed.
– the momentary measured values continue to be
shown in the auxiliary display on the left.
➭ Lift the test probes from the measuring point.
The message openl appears on the auxiliary display.