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Gossen Metrawatt METRA HIT H-E CAR Manual

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8 GMC-I Messtechnik GmbH
5 Measured Value Storage
The METRA HIT27 provides two entirely different options for
storing data:
• Measured Value Memory – DATA Key Function:
Each time a measuring point is contacted, a measured
value is stored in accordance with a defined condition
(see chapter 5.1).
• Memory Mode Operation – STORE Menu Function:
After activating the STORE menu function, all measured
values are saved in accordance with the selected
sampling rate. Memory mode operation is ended
manually using the same menu function, see
chapter 12.2.
In both cases, saved measured values can be read out with
the help of METRAwin10 PC software (as of version 5.22).
However, read-out is only possible if a BD232 IR adapter has
been plugged into the METRA HIT27 and connected to the
PC with an interface cable.
5.1 Measured Value Storage – Key Function “DATA”
(Hold/Compare)
Measured values can be automatically “frozen” with the DATA
hold function. This is useful when, for example, contacting
the measuring points with the test probes requires your full
attention.
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.
After the measured value has been applied and the
corresponding “condition” from the table below has been
fulfilled, the measured value appears at the left-hand auxiliary
display and 2 acoustic signals are generated. At the same
time, “MAN” appears, indicating that the measuring range is
now fixed. The test probes can now be removed from the
measuring points, and the measured value can be read from
the auxiliary display. If the measured value is less than the
value specified in the table, the instrument is reactivated for
storage of the next value and “data” blinks at the display. The
measured value is saved to non-volatile memory, which is
acknowledged by an acoustic signal in each case.
Comparison of measurement values (DATA Compare)
If the newly stored measurement value deviates less than
0.33% of the measuring range from the first measurement
value, the acoustic signal (DATA Compare) sounds twice.
If it deviates more than 0.33% from the measuring range,
only a brief signal sonds.
1)
Reactivation results from falling short of specified measured value limits.
2)
When a measurement value is stored for the first time as a reference value, the
acoustic signal sounds twice.
For subsequent data hold, two acoustic signals are only generated if the
currently frozen value deviates from the fist saved value by less than 0.33% of
the measuring range, depending upon resolution.
Key
R = measuring range, MV = measured value
As long as the DATA function is active, the measuring ranges
should not be changed manually.
The DATA function is deactivated if the DATA| CLEAR key is
pressed and held (approx. 1 s), by turning the rotary switch or
by switching the instrument off and back on again.
Function
DATA
DATA
Condition Response at Instrument
Measuring
Function
Measurement
Value
Sub-Display
Acoustic
Signal
Meas.
Value
DATA
Switch on brief
is
displayed
brief
Store
(stabilized mea-
surement value)
V, Hz > 10% of MR
is
displayed
brief
2x
2)
,
0 L
Reactivate
1)
V, Hz < 10 % of MR stored
meas.
value
blinks
,
0 L
Switch to
function
MIN/MAX
brief see Table chapter 6
Quit long
is
deleted
is
deleted
2x
Acoustic Signal
30.000
20.000 data
V
30.000
MIN MAX
20.000 30.000
V
DATA
DATA
MAN
… 8 …


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