Gossen MetraWatt METRA HIT 28 S User manual

METRA HIT 28S
METRA HIT 29S
Precision Digital Multimeter 3-348-851-03
13/2.06
Operation Instructions

2 GMC-I Gossen-Metrawatt GmbH
1LCDDisplay
2MENU/ON|OFF ON / OFF key
Operating Mode Menu: Entry acknowledgment
3 DATA|CLEAR Function key for measurement value store,
delete and MIN-MAX
Operating Mode Menu: Individual menu item selection
reverse flux direction,
increase values
4 MAN|AUTO Manual measuring range selection key
Operating Mode Menu: Individual menu item selection
forward flux direction,
reduce values
5ESC|FUNC Multifunction key
Operating Mode Menu: Exit menu level and
return to next highest level,
exit parameter entry mode
without storage of values
6Rotary switch for measurement functions
7 Connection jacks
8 Power pack connection jack
9 DKD calibration mark
1
2
3
4
5
6
7
7
max. 600 V !
8
→ chapter 2
→ chapter 5
→ chapter 3
→ chapter 2
→ chapter 3
→ chapter 4
→ chapter 3
9→ chapter 1
→ chapter 8f
f

GMC-I Gossen-Metrawatt GmbH 3
GB
Digital Display Symbols
1 Main display with decimal point and indication of polarity
2 Sub-displays with decimal point and indication of polarity
3 Unit of measure
4 Selected current type
5 Continuous operation, symbol blinks for data transmission
6 Low battery
7 Acoustic signal on, buzzer activated for corresponding function
8 Zero balancing
9 Reference value
10 Memory display, “hold measurement value”
11 Stopwatch activated or elapsed time since start of measurement
12 Together with symbol 11:
elapsed time since activation of corresponding function, counter,
number of events when trigger threshold is exceeded
13 MIN-MAX storage
14 Event marking
15 Synchronized storage, METRA HIT 29S only
16 Memory mode, METRA HIT 29S only
17 Manual measuring range selection
18 Relative value
19 Measurement with clip-on current transformer active:
Factor 1000 or 10000 is considered
1
2
6
4
3
7
5
141517 16
13121098 11
18
19

4 GMC-I Gossen-Metrawatt GmbH
Contents Page
1 Safety Features and Precautions .................................... 6
2 Initial Start-Up ................................................................. 8
3 Selection of Measurement Functions and
Measuring Ranges ........................................................ 10
3.1 Automatic Measuring Range Selection .............................. 10
3.2 Manual Measuring Range Selection .................................. 10
3.3 Quick Measurements ....................................................... 11
4 Triple Digital Display ..................................................... 11
5 Measurement Value Storage
“DATA” (Hold & Compare) ............................................. 12
6 Minimum and Maximum Value Storage
“MIN-MAX” with Time Stamp ....................................... 14
7 Auto Select .................................................................... 16
8 Voltage Measurement ................................................... 17
8.1 Transient Overvoltages ..................................................... 18
8.2 Voltage Measurements for Greater than 600 V .................. 18
8.3 Alternating Voltage Level Measurement (dB) ...................... 19
9 Current Measurement ................................................... 21
9.1 Measurement with (Clip-On) Current Transformers ............ 22
9.1.1 Transformer Output mA or A for AC Measurements ........... 22
9.1.2 Transformer Output V for AC and DC Measurements ......... 23
10 Resistance Measurement .............................................. 24
11 Continuity Testing for Resistance Measurement .......... 25
12 Diode Testing ................................................................ 26
13 Continuity Testing for Diode Tests ................................ 27
14 Capacitance Measurement ........................................... 28
15 Frequency Measurement .............................................. 29
16 Temperature Measurement .......................................... 30
16.1 Temperature Measurement with Pt100 and Pt1000 .......... 30
16.2 Temperature Measurement
with Thermocouple and Reference Junction ...................... 30
17 Counting Events and Zero Crossings ............................. 32
17.1 Event Counting ................................................................ 32
17.2 Count Zero Crossings ...................................................... 34
18 Stopwatch ..................................................................... 34
19 ΔOperating Mode, Reference Value REF. ................... 36

GMC-I Gossen-Metrawatt GmbH 5
GB
Page
20 Power Measurement with the METRA HIT 29S .............38
20.1 Power Measurement with Analog Signals I and V ...............38
20.2 Energy Measurement with Pulses .....................................40
20.3 EnErGY Menu for Energy Measurement ............................41
20.4 Exit Power/Energy Measurement .......................................42
20.5 Power Measurement with
(Clip-On) Current Transformers .........................................42
21 Line Fault Recording with the METRA HIT 29S ..............43
21.1 Line Fault Recording without Memory Mode ......................43
21.2 Trigger Parameters for Line Fault Recording ......................46
21.3 Line Fault Recording with Memory Mode ...........................47
22 Storing Measurement Values with the METRA HIT 29S 47
22.1 General Parameters .........................................................50
22.2 Trigger Functions .............................................................51
22.2.1 Trigger Function Parameters .............................................52
23 Setting the Measurement Parameters ...........................56
23.1 Description of General Parameters in the SEt Menu ..........58
23.1.1 Sampling Rate: rAtE . ......................................................58
23.1.2 Rapid Query: MenuCYCLE . .............................................58
23.1.3 tiME und Datum dAtE ........................................... 58
23.2 Parameter Description of Menu Item: inFo . .....................59
23.3 Default Settings ...............................................................59
23.4 List of All Parameters ......................................................60
24 Data Transmission via the RS 232 Interface .................61
24.1 Activating the Interface .....................................................61
24.2 Selecting Interface Parameters .........................................62
25 Characteristic Values .....................................................64
26 Maintenance ..................................................................74
26.1 Battery ............................................................................74
26.2 Power Pack .....................................................................75
26.3 Fuses ..............................................................................75
26.4 Housing ...........................................................................76
27 Multimeter Messages ...................................................76
28 Accessories ...................................................................77
28.1 General ...........................................................................77
28.2 Characteristic Values of Measuring Cables
(Scope of Supply of Safety Cable Set KS17-2) ...................77
29 Repair and Replacement Parts Service
DKD Calibration Lab
and Rental Instrument Service ......................................77
30 Warranty ........................................................................78
31 Product Support .............................................................79

6 GMC-I Gossen-Metrawatt GmbH
1 Safety Features and Precautions
You have selected an instrument which provides you with a
high level of safety.
This instrument fulfills the requirements of the applicable
European and national EC guidelines. We confirm this with
the CE marking. The relevant declaration of conformity can
be obtained from GMC-I Gossen-Metrawatt GmbH.
The precision digital multimeter is manufactured and tested
in accordance with safety regulations IEC 61010–1:2001/
DIN EN 61010–1:2001/ VDE 0411–1:2002. When used for
its intended purpose, safety of the operator, as well as that
of the instrument, is assured. Their safety is however not
guaranteed, if the instrument is used improperly or handled
carelessly.
In order to maintain flawless technical safety conditions,
and to assure safe use, it is imperative that you read the
operating instructions thoroughly and carefully before plac-
ing your instrument into service, and that you follow all
instructions contained therein.
For your safety, as well as for the protection of your instru-
ment, the multimeter is equipped with an automatic socket
blocking device. This is coupled to the rotary switch, and
only allows connection to the socket required for the
selected function. It also prevents the switching of the
rotary selector to disallowed functions when a measure-
ment cable is plugged into a socket. Exception METRA
HIT 29S: in switch position W/mA or W/A jack V remains
open for power measurement, in position W/A jack mA is
only partially covered or blocked.
Use for Intended Purpose:
– The multimeter described herein is a portable instrument
which can be held in one hand during measurements.
– Only such measurements are performed as described in
chapters 8 to 21.
– The measuring instrument including measuring cables
and plug-on test probes is only used within the measur-
ing category indicated under the heading "Electrical
Safety" on page 72 (refer to the table on page 7 for the
meaning of the measuring categories).
– The limits of the overload capacity may not be exceeded.
Refer to the Characteristic Values on page 66 and page
70 for the duration and values of the overload capacity.
– Measurements are only performed within the specified
ambient conditions. Refer to page 73 for the operating
temperature range and relative humidity.
– The measuring instrument is only used in accordance
with the specified protection type, see page 73.
Observe the following safety precautions:
• The instrument may only be operated by persons who
are capable of recognizing contact hazards and taking
the appropriate safety precautions. Contact hazards
exist anywhere, where voltages of greater than 33 V may
occur (effective value).

GMC-I Gossen-Metrawatt GmbH 7
GB
• Avoid working alone when taking measurements which
involve contact hazards. Be certain that a second person
is present.
• The maximum allowable voltage between any given connector
jack (7) and earth is equal to 600 V, category III or to 300 V,
category IV.
• Be prepared for the occurrence of unexpected voltages
at devices under test (e.g. defective devices). For exam-
ple, capacitors can be dangerously charged.
• Make certain that the measurement cables are in flaw-
less condition, e.g. no damage to insulation, no interrup-
tions in cables or plugs etc.
• No measurements may be made with this instrument in
electrical circuits with corona discharge (high-voltage).
• Special care is required when measurements are made
in HF electrical circuits. Dangerous pulsating voltages
may be present.
• Measurements under moist ambient conditions are not
allowable.
• Be absolutely certain that the measuring ranges are not
overloaded beyond their allowable capacities. Limit val-
ues can be found in the table “Measuring Ranges” in
Chapter 25 „Characteristic Values“.
• All current ranges are equipped with fuses (Nominal volt-
age of fuse = 1000 V). The maximum allowable voltage
for the measuring current circuit (= rated voltage of the
fuse) is equal to 600 V AC/DC in the “mA” and “A”
ranges.
• In switch position AUTO SELECT, Ω, , °C and F, the instru-
ment may only be used in power installations when the electri-
cal circuit is protected with a fuse or circuit breaker up to 20 A,
and the nominal voltage of the installation does not exceed
600 V in order to provide protection also under single-fault con-
ditions (EN 61010-1).
Measuring Categories and their Meaning per IEC 61010-1
The measurement category and the relevant maximum
rated voltage (e. g. 600 V CAT III) which are shown on the
instrument casing apply to your measuring instrument.
CAT Definition
I
Measurements in electrical circuits not directly connected to the mains
system:
e. g. power systems in motor vehicles or aeroplanes,
batteries ...
II Measurements in electrical circuits directly connected to the low-volt-
age system: via plug, e.g. in households, offices, laboratories ...
III
Measurements in facility installations:
stationary consumers, distributor connections, devices
attached to a distributor
IV Measurements at the source of low-voltage installations:
Meters, main terminal, primary overcurrent protection devices

8 GMC-I Gossen-Metrawatt GmbH
Meaning of symbols on the instrument
Warning concerning a point of danger
(Attention: observe documentation)
Earth
Continuous, doubled or reinforced
insulation
CAT III / IV Instrument for measurement category III or IV
VDE testing authority approval mark
CSA approval mark
(North American test authority)
Indicates EU conformity
DKD calibration mark (red seal):
Repair, Parts Replacement and Balancing
When the instrument is opened, voltage conducting parts
may be exposed. The instrument must be disconnected
from the measuring circuit for repair, replacement of parts
or balancing. If repair or balancing of a live, open instru-
ment is required, this may only be carried out by trained
personnel who are familiar with the dangers involved.
Errors and Extraordinary Strains
If it may be assumed that the instrument can no longer be
operated safely, it must be removed from service and
secured against unintentional use.
Safe operation can no longer be relied upon,
• if the instrument demonstrates visible damage,
• if the instrument no longer functions,
• after a long period of storage under unfavorable condi-
tions.
2 Initial Start-Up
Battery
Please refer to chapter 26.1 regarding correct battery
installation.
Attention!
!
Before opening the instrument, disconnect it from
the measuring circuit!
!
Serial number
GOSSEN METRAWATT Calibration Laboratory
Date of calibration
German Calibration Service – Calibration Laboratory
B0730
99-02
DKD-K-
19701

GMC-I Gossen-Metrawatt GmbH 9
GB
Operation with mains adapter
(accessory equipment, not included as a standard feature)
During power supply via mains adapter NA5/600, the
inserted batteries are cut off electronically so that they
rmay remain in the instrument, see also chapter 26.2. If
rechargeable batteries are used, they must be charched
outside the instrument.
Switching the Instrument On Manually
➭Press the ON key.
Activation is acknowledged with a brief acoustic signal.
As long as the key remains pressed, all segments of the
liquid crystal display (LCD) are active. The LCD is shown
on page 3. After the key is released, the instrument is
ready for operation.
Switching the Instrument On via PC
After transmission of a data block from the PC, the multim-
eter is switched on. See also chapter 24.
Automatic Activation/Deactivation
To extend battery life, the multimeter is switched on and off
automatically in the transmit and data storage modes pro-
vided the transmit/storage interval rate is set at ≥10 s.
Note!
☞Electrical discharge and high frequency interference
can cause incorrect displays, and may block the
measuring sequence. To reset, switch the instru-
ment off, and then back on. If this procedure is
unsuccessful, briefly disconnect the battery from the
contact terminals.
Setting Time and Date
See Chapter 23.1.3, page 58.
Switching the Instrument Off Manually
➭Press and hold the
ON key, until the display is deacti-
vated. Deactivation of the instrument is acknowledged
by two brief acoustic signals.
Automatic Shut-Off
Your instrument shuts itself off automatically, if the mea-
surement value remains constant for a long period of time
(maximum measurement value fluctuation: approx. 0.8%
of the measuring range per minute or 1 °C or 1 °F per
minute), and if none of the keys or the rotary switch are
activated for a period of 10 minutes. Deactivation of the
instrument is acknowledged by a brief acoustic signal.
Exceptions are as follows:
Event counting, count zero crossing, stopwatch, transmit
or memory mode, continuous operation, power measure-
ment and line fault recording.
Disabling of Automatic Shut-Off
The instrument can also be switched to “CONTINUOUS ON”.
➭Simultaneously press the ON key and the multifunction
key ESC|FUNC when switching the instrument on. The
“CONTINUOUS ON” function is indicated at the LCD
with the symbol.

10 GMC-I Gossen-Metrawatt GmbH
3 Selection of Measurement Functions and
Measuring Ranges
The rotary switch is coupled to the automatic socket
blocking device, which makes two jacks available for each
function (except mA and A: 3 jacks. The jack for the “mA”
socket in the “A” function is half open). Before switching to
the “mA” or “A” functions, or out off the “mA” or “A” func-
tions, be certain that the plug has been removed from the
corresponding jack. The socket blocking device prevents
inadvertent switching to disallowed functions when a plug
connection exists.
3.1 Automatic Measuring Range Selection
The multimeter is equipped with automatic measuring
range selection for all measuring ranges, except for tem-
perature measurement and diode testing, as well as
respective continuity testing. This automatic feature is
active as soon as the instrument is switched on. The
instrument automatically selects the measuring range
which provides optimum resolution for the current mea-
sured quantity. The previously selected voltage measuring
range remains active after switching the instrument to fre-
quency measurement, events counting or count zero
crossing. The instrument is automatically switched to the
next highest or next lowest measuring range for the follow-
ing measured quantities:
1) 2800 digits apply when switching from 300 kHz to 30 kHz.
3.2 Manual Measuring Range Selection
The automatic measuring range feature can be deactivated
and the ranges can be manually selected and prescribed
according to the following table.
The manual mode is deactivated by pressing and holding
the MAN|AUTO key (approx. 1s), by activating the rotary
switch or by switching the instrument off and back on again.
Measuring Range Reso-
lution
Switching to the Next
Highest Range
at ±(... d + 1 d)
Switching to the Next
Lowest Range
at ±(... d -1 d)
V , mA , Ω, Hz 1) 5 ¾ 310,000 28,000
V,V,A,mA,
A , 30 mF 4 ¾ 31,000 2,800
3 nF ... 3 mF 3 ¾ 3,100 280
⇓
MAN/
AUTO
Function
Acknowledge
Display Acoust.
Signal
Brief Manual Mode Active: selected measuring range is fixed MAN 1 x
Brief
Switching Sequence for:
V: 300 mV →3V→30 V →300 V →600 V →300 mV
→...
dB: same switching sequence as for V
mA : 300 μA→3mA→30 mA →300 mA →300 μA ...
A: 3A→10 A → 3 A ...
Ω:30MΩ→300 Ω→ 3kΩ→30 kΩ→ 300kΩ→
3MΩ→30 MΩ...
F: 3nF→30 nF →300 nF →3 μF→30 μF→
300 μF→3000 μF→30000 μF→3 nF ...
Hz: 300 Hz →3kHz→300 kHz →300 Hz ...
MAN 1 x
Long Return to Automatic Range Selection — 2 x

GMC-I Gossen-Metrawatt GmbH 11
GB
3.3 Quick Measurements
If you wish to perform quicker measurements than those
possible with the automatic measuring range selection
function, make sure to establish the appropriate measuring
range:
•bymanual measuring range selection, i. e. by selecting
the measuring range with the best resolution, see
chapter 3.2.
or
•viaDATA function, see chapter 5. After the first measure-
ment, the proper measuring range will be automatically
determined so that measurements are performed
more rapidly from the second measured value
onwards.
With both functions, the established measuring range is
maintained for the subsequent series mode measurements.
4 Triple Digital Display
The three digital displays, one main display and two sub-
displays, show the measurement value with correct deci-
mal point and sign. The selected unit of measure and the
current type are also displayed. A minus sign appears in
front of the number for the measurement of zero-frequency
direct quantities, if the positive pole of the measured quan-
tity is applied to the “⊥” input.
“OL” (overload) is displayed, if the actual value falls below
the measuring range lower limit for the following measured
quantities:
V DC, I DC, Ω, Hz: 309999
V (AC, AC+DC), I (AC+DC), dB (V), 30 mF: 30999
W, VA, VAr, Wh (METRA HIT 29S): 30999
3 nF ... 3 mF: 3099
Refreshing of the digital display occurs at different intervals
for the various measured quantities (see display update
page 71).
Although the main display is activated immediately after the
multimeter is switched on, the two sub-displays must be
activated with the DATA|CLEAR key. This prevents the contin-
uous display of an undefined condition which was present
at the start of measurement, e.g. open-circuit, as a maxi-
mum value.
015.000
013,000 018,000
Sub-Display: MIN
Main Display
Sub-Display: MAX

12 GMC-I Gossen-Metrawatt GmbH
5 Measurement Value Storage
“DATA” (Hold & Compare)
Measurement values can be automatically “frozen” with the
DATA (Hold) function. This can be especially useful when
your full attention is required for testing the measuring
point with the test probes.
After the measurement value has been acquired, and the
appropriate “condition” has been fulfilled according to the
following table, the measurement value is displayed in the
left hand sub-display and two acoustic signal sounds. At
the same time “MAN” appears and indicates that the mea-
suring range is now set. The test probes can now be
removed from the measuring point and the measurement
value can be read from the sub-display. If the measure-
ment value lies below the limit value shown in the table, the
instrument is reactivated for the storage of a new value; the
“DATA” display blinks.
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 sounds.
DATA
Acoustic Signal
015.000
015.010
015,000

GMC-I Gossen-Metrawatt GmbH 13
GB
1) Reactivation when actual value falls below prescribed limit value
2) Relative to alternating voltage values
3) Also applies to continuity testing
4) When a measurement value is stored for the first time as a reference value,
the acoustic signal sounds twice. For subsequent storage of the same mea-
surement value, the acoustic signal sounds only twice if the subsequently
stored measurement value deviates from the first value by less than 0.33%
of the measuring range dependent upon resolution.
5) Exception: 10% at 300 Ωor 3 nF
Abbreviations
MR = Measuring range
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), if the rotary switch is acti-
vated or if the instrument is switched 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
dis-
played
brief
Store
(stabilized mea-
surement value)
V, dB 2), A
F, Hz > 3.3% 5) of MR is
dis-
played
brief
2x 4)
Ω 3),3) OL5)
Reactivate 1)
V, dB 2), A
F, Hz
< 3.3% 5) of MR stored
meas.
value
blinks
Ω 3), 3) OL5)
Switch to
function
MIN/MAX
brief see Table chapter 6
Quit long is
deleted
is
deleted 2x

14 GMC-I Gossen-Metrawatt GmbH
6 Minimum and Maximum Value Storage
“MIN-MAX” with Time Stamp
Minimum and maximum values can be read out at the sub-
displays for long-term observation of measured quantities.
➭If the DATA|CLEAR key is activated twice, current MIN and
MAX values are displayed at the sub-displays.
➭Press the DATA|CLEAR key again to display the MIN value
and the time of occurrence.
➭If the DATA|CLEAR key is once again activated, the MAX
value and the corresponding time of occurrence are dis-
played.
MIN and MAX values are deleted by pressing and holding
the DATA|CLEAR key (approx. 1 s), by activating the rotary
switch or by switching the instrument off and back on
again.
Note!
☞No new MIN-MAX values are determined for
2 seconds after a change of measuring range, so
that measurement values can stabilize.
Function
MIN/MAX
⇓
DATA
MIN and MAX
Measurement Values/
Time of Measurement
Reaction at Instrument
Display Acoust
Signal
Main Display Sub-
Displays
1.
Store 2 x brief are stored
current
measurement
value
MIN and
MAX 1 x
2.
Store and
display
brief
are stored
t and MIN 1 x
brief t and
MAX 1 x
3.
Return to 1. brief are stored same as 1. same as
1. 1 x
Cancel long are deleted is deleted is deleted 2 x

GMC-I Gossen-Metrawatt GmbH 15
GB
CLEAR
long
DATA
brief
DATA
brief
DATA
brief
DATA
brief
MIN MAX
tMIN MIN
tMAX MAX
Current
DATA
brief
09:20:05
09:20:05
015.000
015.345
015.345
015.345
015.986
015.123
015.345
015.678
015.986
Measurement Value
Current
Measurement Value
Current Meas. Value
Current Meas. Value

16 GMC-I Gossen-Metrawatt GmbH
7AutoSelect
In the Auto Select switch position, the auto-select function
(automatic selection of measuring function) allows for
autonomous recognition of the measured quantity, which is
applied between earth and the voltage jacks.
An overview of possible measured quantities as well as the
respective prerequisites for recognition can be found in the
AUTO SELECT table on page 67.
Note!
☞Diodes must be connected from the anode side (“+”
pole) to the jack.
For polarized capacitors, the “+” pole must be con-
nected to the “F” jack and the “–” pole to the “⊥”
jack.
Resistors and semiconductor paths connected in
parallel to the capacitor distort measurement
results!
➭Set the rotary switch to AUTO SELECT.
Attention!
!
In the auto-select function, no more than 600 VTRMS
may be applied between “⊥” and “V” jacks.
➭Connect the measurement cables as shown. The “⊥”
jack should be grounded.
Note!
☞The following chapter contains more information
concerning individual measured quantities.
0PEn
600V
V
F°C

GMC-I Gossen-Metrawatt GmbH 17
GB
8 Voltage Measurement
➭Depending upon the voltage to be measured, set the
rotary switch to V , V or V .
➭Connect the measurement cables as shown. The “⊥”
jack should be grounded.
Note!
☞In the 600 V range, an intermittent acoustic signal
sounds alarm if the measurement value exceeds
1000 V.
Attention!
!
Make absolutely certain that neither of the current
ranges (“mA” or “A”) is active when the multimeter is
connected for voltage measurements! If the fuse trip
limits are exceeded due to operator error, both the
operator and the instrument are in danger!
Zero Balancing in the 300 mV Measuring Range
➭Select the 300 mV measuring range.
➭Connect the measurement cables to the instrument, and
connect the free cable ends to one another.
➭Briefly press the multifunction key ESC|FUNC.
015.000
600V
V
F°C
– (+)
~
+ (–)
~

18 GMC-I Gossen-Metrawatt GmbH
The instrument acknowledges zero balancing with an
acoustic signal and “000.000” (±1 digit) and the “ZERO”
symbol appear at the LCD. The voltage which was dis-
played at the moment the key was activated serves as a
reference value (max. ±20000 digits). It is automatically
subtracted from subsequently measured values.
➭Zero balancing can be deleted:
– by pressing and holding the multifunction key ESC|FUNC ,
after which deletion is acknowledged with a twice
repeated acoustic signal,
– by switching the instrument off.
8.1 Transient Overvoltages
The multimeters are protected against transient overvolt-
ages of up to 6 kV with a halftime value for front time of
1.2/50 μs. Due to the fact that overvoltages of greater
duration can be expected for measurements at transform-
ers or motors etc., we recommend our KS30 measuring
adapter. It provides protection against transient overvolt-
ages of up to 6 kV with a halftime value for front time of 10/
1000 μs. Continuous loading capability is equal to
1200 VTRMS. Additional influence error due to use of the
KS30 measuring adapter amounts to approximately –2%.
8.2 Voltage Measurements for Greater than 600 V
Voltages of greater than 600 V can be measured with a
high-voltage probe, e.g. the HV3 (3 kV) or the HV30
(30 kV DC) of GMC-I Gossen-Metrawatt GmbH. The earth-
ing terminal must be connected to ground for measure-
ments of this type. Observe all required safety precautions!
000.000
Voltage Measurement > 600 V
with HV3 High-Voltage Probe
Black
Black
Red
x1000 x100
V
F
° C

GMC-I Gossen-Metrawatt GmbH 19
GB
8.3 Alternating Voltage Level Measurement (dB)
The voltage level measurement is
used for determining the overall
damping or gain of a transmission
system (shown here as a two-port
network).
Voltage level [dB]
with V1= VREF (reference level rEFvALUE)
result > 1: gain; result < 1: damping
➭Set the rotary switch to V .
➭Briefly press the multifunction key ESC|FUNC.
The level measurement function is now active. The mea-
surement value is calculated from the effective value of the
alternating voltage component dependent upon the mea-
suring range (300 mV ... 600 V), and is displayed. The
default setting for the reference level is 0 dB = 0.775 V
(1 mW at 600 Ω) and appears in the left hand sub-display.
This value can be changed in the Setup menu:
SEt ↵ VrEFvALUE ↵Vunit dB ↵XXX.XXX V/dB VU↵.
Note!
☞No matching resistors have been installed into the
instrument. It takes measurements with a high input
resistance of 5 MΩ. Input resistance for voltage mea-
surement is listed under technical data. In order to
perform correct measurements at non-terminated
devices under test, a matching resistor must be con-
nected to the terminals. Observe power dissipation at
the matching resistor!
600V
V
F°C
UN= max. 1 kV
Voltage Measurement with
the KS30 Measuring Adapter
V1V2
20
V2
V1
------log⋅=

20 GMC-I Gossen-Metrawatt GmbH
Alternating voltage applied to the jacks appears at the right
hand sub-display.
➭The alternating voltage measuring range is selected with
the MAN|AUTO key.
➭The measurement value storage function for dB is made
available by pressing the DATA|CLEAR key.
➭If the DATA|CLEAR key is pressed again, the normal display
for dB with MIN/MAX values appears.
➭If the ESC|FUNC and MAN|AUTO keys are pressed simulta-
neously, the actual measurement value becomes the ref-
erence value. The instrument returns to the first display
with the measurement value as reference level.
➭If the ESC|FUNC multifunction key is activated repeatedly,
the instrument is switched to frequency measurement,
event measurement, voltage measurement and finally
back to level measurement.
The dB ranges are listed under technical data.
FUNC
brief
Reference Level Alternating
Voltage
Level
DATA
brief
DATA
brief
Stored
Level
011.75
011.50
011.50
0.7750 3.0000
011.50
011.00 012.00