GOSSEN-METRAWATT GMBH
5
METRA
28S and 29S
Precision Digital Multimeter, Power Meter
1)
With zero balancing
2)
Except for sinusoidal waveshape
Reference Conditions
Ambient Temperature
+23
°
C
±
2 K
Relative Humidity
45 ... 55%
Meas. Quantity
Frequency
45 ... 65 Hz
Meas. Quantity
Waveform
sine
Battery Voltage
3 V
±
0.1 V
Adapter Voltage
4.5 V
±
0.2 V
Response Time
Response Time
(after manual range selection)
Power Supply
Battery
2 ea. 1.5 V mignon cell
alkali manganese cell per IEC LR6
zinc carbon battery per IEC R6
Service Life
with alkali manganese cell:
approx. 100 hr.
with zinc carbon battery:
approx. 50 hr.
Battery Test
automatic display of “
” symbol
when battery voltage drops below
approx. 2.3 V
Economy Circuit
The instrument is switched off automatically, if the measurement
value remains unchanged for about 10 minutes, and if no activa-
tion of the operating elements occurs during this time. This func-
tion can be deactivated. This does not apply to the following func-
tions: events counting, counting of zero crossings, stopwatch,
power measurement, power disturbance recording, transmission
and menu modes, and “continuous on”.
Ambient Conditions
Operating Temperature
−
20
°
C ... +50
°
C
Storage Temperature
−
25
°
C ... +70
°
C (without batteries)
Relative Humidity
max. 75%, without condensation
Climatic Category
2z/
−
20/50/70/75%
in compliance with VDI/VDE 3540
Elevation
to 2000 m
Mechanical Design
Protection
Devices: IP 50,
Connector jacks: IP 20
Dimensions
84 mm x 195 mm x 35 mm
Weight
METRA
Hit
â
28S: approx. 350 gr.
with batteries
METRA
Hit
â
29S: approx. 405 gr.
with batteries
Influence
Variable
Sphere
of Influence
Meas. Quantity /
Meas. Range
1)
Influence Error
2)
Measuring
Quantity
Waveform
Crest
factor CF
1 ... 3
V
, A
±
1 % of rdg.
> 3 ... 5
±
3 % of rdg.
Influence
Variable
Sphere
of Influence
Meas. Quantity /
Meas. Range
1)
Influence Error
Relative
Humidity
75 %
3 days
instrument OFF
V, A
, Ω
F, Hz
°
C
1 x inherent deviation
Influence
Variable
Sphere of Influence
Meas. Range
Damping
±
dB
Common Mode
Interference
Voltage
Interference magnitude max. 1000 V
V
> 90 dB
Interference magnitude max. 1000 V
50 Hz, 60 Hz sine
300 mV
...
30 V
> 80 dB
300 V
> 70 dB
1000 V
> 60 dB
Series Mode
Interference
Voltage
Interference magnitude V
,
per nominal measuring range value,
max. 1000 V
, 50 Hz, 60 Hz sine
V
> 60 dB
Interference magnitude max. 1000 V
V
> 60 dB
1
2
3
4
5
CF
0
10000
30000
20000
Voltage and Current Measurement
The allowable crest factor, CF, for the alternating magnitude
to be measured is dependent upon the displayed value:
Digit
Meas. Quantity/
Measuring Range
Digital Display
Response Time
Meas. Quantity
Step Function
V
, V
,
A
, A
1.5 s
from 0 to 80 % of
measuring range upper limit
300
Ω
... 3 M
Ω
2 s
from
∞
to 50 % of
measuring range upper limit
30 M
Ω
5 s
Continuity
< 50 ms
1.5 s
3 nF ... 300
µ
F
max. 2 s
from 0 to 50 % of
measuring range upper limit
3 000
µ
F
max. 7 s
30 000
µ
F
max. 14 s
>10 Hz
max. 1.5 s
°
C
max. 3 s
