GMC-I Gossen-Metrawatt GmbH
9
GB
4
LCD Display
4.1
Digital Display
The digital display (9) shows the measurement value with correct
decimal point and sign. The selected unit of measure (12) and the
current type (11) are also displayed. A minus sign appears in front
of the value for zero-frequency quantities, if the positive pole of the
measured quantity is applied to the “
⊥
” input. “OL” is displayed if an
upper range limit of 3099 is exceeded (within
range: 1999).
The digital display is refreshed twice per second for the measure-
ment of V and
Ω
.
4.2
Analog Display
The analog display with pointer demonstrates the dynamic charac-
teristics of a moving coil mechanism and is refreshed 20 times per
second for V and
Ω
measurements. The analog display is especially
advantageous for the observation of measurement value fluctua-
tions and for balancing.
The analog display has its own polarity indicator. The negative
range of the analog scale (15) includes 5 graduations for the mea-
surement of zero-frequency quantities, so that fluctuations around
zero can be observed. If the measurement value exceeds the dis-
play range the triangle at the left side (16) is first displayed, and
then, after about 0.7 s, polarity at the analog display is reversed.
Overranging (> 3099 digit, or > 1999 in the
range) is indicated
with the triangle at the right side (13).
5
Measurement Value Storage, “DATA”
Measurement values can be automatically “frozen” with the DATA
function. This can be especially useful when contacting the mea-
suring point with the test probes requires your full attention. After
the measurement value has been acquired and the appropriate
“condition” has been fulfilled according to the following table, the
measured quantity is frozen at the digital display and an acoustic
signal sounds. The test probes can now be removed from the mea-
suring point and the measurement value can be read from the digi-
tal display (9). If the measurement value lies below the limit value
shown in the table, the instrument is reactivated for the storage of a
new value.
The DATA function has no effect on the analog display, from which
you can continue to read the current measurement value. However,
when the digital display has been frozen, the decimal point can no
longer be shifted. Thus if automatic measuring range selection has
been activated, you are no longer able to determine which measur-
ing range is active for the analog display. Manual measuring range
selection is disabled, as long as the DATA function is active.
1)
Reactivation when actual value falls below prescribed limit value
2)
Except for 30 mV and 300 mV ranges
The DATA function is deactivated if you press an hold key
DATA|MIN/MAX
(approx. 1 s), if the rotary switch is activated or if the
instrument is switched off and back on again.
Function
DATA
⇓
DATA
MIN/MAX
(3)
Condition
Reaction at Instrument
Measuring
Range
Meas. Value
Limits
(digits)
Display
Acoustic
Signal
Value
Digital
DATA
Activate
brief
blinks
1 x
Store
V
2)
Ω
F, Hz
>280
<OL
>280
is
displayed
is
displayed
1 x
Reactivate
1)
V
2)
Ω
F, Hz
<280
OL
<280
stored
meas.
value
blinks
Cancel
long
is deleted is deleted
2 x
