HM8115 Power Meter - Test Equipment Depot

HM8115 Power Meter - Test Equipment Depot
• ENGLISH
®
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Instruments
Visit us at www.TestEquipmentDepot.com
Power Meter
HM8115
MANUAL
Table of Contents
General information regarding the CE-marking .......... 3
Specification ................................................................... 15
General Information ......................................................
Safety .........................................................................
Intended purpose and operating conditions ..............
Warranty .....................................................................
Switching over the mains/line voltage .......................
Before switching on ...................................................
16
16
16
16
16
17
Basics ..............................................................................
RMS Value ..................................................................
Crest factor ................................................................
Power .........................................................................
17
17
17
17
Controls and Displays ................................................... 18
Hardware ........................................................................ 22
Baudrate ..................................................................... 22
Interface parameter ................................................... 22
Commands ..................................................................... 23
14
Änderungen vorbehalten / Subject to change without notice
HM8115 Power Meter
•
•
•
•
•
Power measurement 0 to 8 kW
Simultaneous reading of voltage, current and power
Power (Watts), reactive power (VAR) and phase (cos ϕ) selectable
Fully isolated auto ranging inputs
Programmable via RS 232; Documentation software included
The HM8115 Power-Meter is a versatile yet easy
to operate instrument for laboratory and surveillance
applications. It offers good accuracy and all necessary
features at reasonable cost. The instrument is
extremely easy to operate without omitting
important features. Simultaneous display of voltage,
current, and power allows the operator to observe
all important parameters at a glance. The built-in
RS232 interface makes the HM8115 very handy
for use in automated systems and allows easy
registration of power parameters on site.
Specifications
Accuracy (50-60 Hz):
(+18°C to +28°C)
Monitor
Voltage
Connector:
True RMS measurement
Ranges (Resolution):
Accuracy:
Input impedance:
Crest Factor:
Protection:
50 V (0.1 V); 150 V (1 V);
500 V (1 V)
±(0.4% + 5 digits), 20 Hz - 1 kHz
±(0.6% + 5 digits), DC
1 MΩ // 100 pF
max. 3.5 at full scale
750 V peak
True RMS measurement
Ranges (Resolution):
160 mA, 1.6 A (1 mA);
16 A (10 mA)
±(0.4% + 5 digits), 20 Hz-1 kHz
±(0.6% + 5 digits), DC
4 max. at full scale
Crest Factor:
Protection
Measuring Circuit 1: Fuse 16 A (FF) very quick acting,
6.3x32mm
Measuring Circuit 2: Fuse 10 A (T) time lag, 5x20mm
Active Power
Ranges (Resolution): 8 W (1 mW); 24 W, 80 W (10 mW);
240 W, 800 W (100 mW); 2400 W, 8000W (1 W)
Accuracy:
±(0.5%+ 10 digits), 20 Hz - 1 kHz
± (0.5% + 10 digits), DC
Type:
Protocol:
Transmission rates:
Functions:
RS232 (3 wires)
Xon/Xoff
1200 / 9600 Baud
Control / Data request
Operation/Displays
Operation
(automatic or manual):
Over Range Indicator:
Voltage Display:
Current Display:
Display (combined) for
Power:
Reactive Power:
Phase Shift:
Current, Voltage, Power
optical, acoustical
3 digit, 7-segment LED
4 digit, 7-segment LED
4 digit, 7-segment LED
4 digit, 7-segment LED plus
sign for capacitive load
3 digit, 7-segment LED
Miscellaneous
Reactive Power
Ranges (Resolution):
8 VAr (1mVAr); 24 VAr, 80 VAr
(10 mVAr); 240 VAr, 800 VAr (100 mVAr);
2400 VAr, 8000 VAr (1 VAr)
Accuracy:
± (2.5 % + 10 digits + 0.02 x P),
20 – 400 Hz; P = Power
Phase Shift
Display:
Resolution:
BNC socket (galvanically isolated from
measuring circuits and RS 232 interface)
Output Level: 2 Vrms at full scale (2400/8000 digits)
Accuracy:
typical 5 %
Polarity (reference):
inverted (power)
Output Impedance:
approx. 10 kW
Bandwidth:
DC - > 1kHz
Protection:
± 30V
Interface
Current
Accuracy:
± (1.5 deg + 2 digits)
(V and I > 1/10 of range)
cos ϕ (0 to +1.00)
cos ϕ ± 0.01
Änderungen vorbehalten / Subject to change without notice
Protective system:
Power Supply:
Power consumption:
Temperature:
Humidity:
Dimensions:
Weight:
Safety class I (EN 61010,
Cat III 600 V)
115/230 V ± 10% , 50-60 Hz
max. 15 W at 50 Hz
10 - 40 °C (operating)
RH < 80 %
W 285, H 75, D 365 mm
approx. 4 kg
15
General Information
General Information
Immediately after unpacking, the instrument should be
checked for mechanical damage and loose parts in the
interior. If there is transport damage, the supplier must be
informed immediately. The instrument must then not be
put into operation.
The instrument has been designed for indoor use. The
permissible ambient temperature range during operation is
+10°C (+50°F) ... +40°C (+104°F). It may occasionally be
subjected to temperatures between +10°C (+50°F) and 10°C (+14°F) without degrading its safety. The permissible
ambient temperature range for storage or transportation is
-40°C (-40°F) ... +70°C (+158°F). The maximum relative
humidity is 80%.
Safety
This instrument has been designed and tested in accordance
with EN 61010-1 (overvoltage category II, pollution degree
2) safety requirements for electrical equipment for
measurement, control, and laboratory use. The IEC
regulation IEC 1010-1 corresponds to this standard. It has
left the factory in a safe condition. This instruction manual
contains important information and warnings which have to
be followed by the user to ensure safe operation and to
retain the POWER METER in a safe condition.
If condensed water exists in the instrument it should be
acclimatized before switching on. In some cases (e.g.
extremely cold) two hours should be allowed before the
instrument is put into operation. The instrument should be
kept in a clean and dry room and must not be operated in
explosive, corrosive, dusty, or moist environments. The
instrument can be operated in any position, but the
convection cooling must not be impaired. The ventilation
holes must not be covered. For continuous operation the
instrument should be used in the horizontal position.
Case and chassis are connected to the protective earth
contact of the appliance inlet. The instrument operates
according to Safety Class I (three-conductor power cord
with protective earthing conductor and a plug with earthing
contact).
The specifications stating tolerances are only valid if
the instrument has warmed up for 30minutes at an
ambient temperature between +15°C (+59°F) and
+30°C (+86°F). Values without tolerances are typical
for an average instrument.
The mains/line plug must only be inserted in a socket outlet
provided with a protective earth contact. The protective
action must not be negated by the use of an extension cord
without a protective conductor.
The mains/line plug must be inserted before
connections are made to measuring circuits.
The grounded accessible metal parts (case, sockets, jacks)
and the mains/line supply contacts (line/live, neutral) of the
instrument have been tested against insulation breakdown
with 2200V DC.
Whenever it is likely that protection has been impaired, the
instrument shall be made inoperative and be secured against
any unintended operation. The protection is likely to be
impaired if, for example, the instrument
• shows visible damage,
• fails to perform the intended measurements,
• has been subjected to prolonged storage under unfavourable conditions (e.g. in the open or in moist environments),
• has been subject to severe transport stress (e.g. in poor
packaging).
Intended purpose and operating conditions
This instrument must be used only by qualified experts who
are aware of the risks of electrical measurement.
The instrument is specified for operation in industry, light
industry, commercial and residential environments.
Due to safety reasons the instrument must only be
connected to a properly installed power outlet, containing a
protective earth conductor. The protective earth connection
must not be broken. The power plug must be inserted in
the power outlet while any connection is made to the test
device.
16
Warranty
HAMEG warrants to its Customers that the products it
manufactures and sells will be free from defects in materials
and workmanship for a period of 2 years. This warranty
shall not apply to any defect, failure or damage caused by
improper use or inadequate maintenance and care. HAMEG
shall not be obliged to provide service under this warranty
to repair damage resulting from attempts by personnel other
than HAMEG representatives to install, repair, service or
modify these products.
In order to obtain service under this warranty, Customers
must contact and notify the distributor who has sold the
product. Each instrument is subjected to a quality test with
10 hour burn-in before leaving the production. Practically all
early failures are detected by this method. In the case of
shipments by post, rail or carrier it is recommended that
the original packing is carefully preserved. Transport
damages and damage due to gross negligence are not
covered by the guarantee.
In the case of a complaint, a label should be attached to the
housing of the instrument which describes briefly the faults
observed. If at the same time the name and telephone
number (dialling code and telephone or direct number or
department designation) is stated for possible queries, this
helps towards speeding up the processing of guarantee
claims.
Switching over the mains/line voltage
The POWER METER operates on mains/line voltages of 115
Vac and 230 Vac. The voltage selection switch is located on
the rear of the instrument and displays the selected voltage.
The correct voltage can be selected using a small
screwdriver.
Remove the power cable from the power connector marked
Änderungen vorbehalten / Subject to change without notice
Basics
“INTERNAL INSTRUMENT SUPPLY” prior to making any
changes to the voltage setting. The fuses must also be
replaced with the appropriate value (see table below) prior
to connecting the power cable. Both fuses are externally
accessible by removing the fuse cover located above the 3
pole power connector.
For AC power measurement as well as current and voltage,
the signal shape and the phase relationship must be
considered. If voltage and current are sinusoidal, the power
can be easily calculated when the phase shift between them
is known. Calculation of power parameters becomes
complex with non-sinusoidal wave shapes.
The fuse holder can be released by pressing its plastic
retainers with the aid of a small screwdriver. The retainers
are located on the right and left side of the holder and must
be pressed towards the centre. The fuses can then be
replaced and pressed in until locked on both sides.
The POWER METER measures the average value of the
instantaneous power and remains accurate whatever the
shape of the signal, provided it is operated within the
specification limits (frequency and crest factor).
Use of patched fuses or short-circuiting of the fuse holder
is not permissible; HAMEG assumes no liability whatsoever
for any damage caused as a result, and all warranty claims
become null and void.
Fuse type:
Size 5x20mm; 250V AC fuse;
must meet IEC specification 127,
Sheet III (or DIN 41 662
or DIN 41 571, sheet 3).
Time characteristic: time-lag (T).
Fuse rating for
Line voltage 115V~ ±10%: T 200 mA
Line voltage 230V~ ±10%: T 100 mA
When reactive elements are inserted in the generator/load
circuit, the current and voltage are phase shifted with respect
to each other.
With the designations
V = RMS value of a sine wave voltage
I = RMS value of a sine wave current
j = phase shift between voltage and current
the required value can be calculated from the two given
quantities
Apparent Power (Unit Volt Ampere, short sign VA)
VA = V x I
True Power (Unit Watt, short sign P)
Before switching on.
Attention!
Before connecting the power cable to the power socket
(19) marked “INTERNAL INSTRUMENT SUPPLY”, the
correct setting of the mains/line switch (20) must be
checked. If a different setting is required, the fuses must
be changed (note “Switching over the mains/line
voltage”). All instruments shipped to European countries
are preset to 230 Vac.
P = V x I cos ϕ
Reactive Power (Voltampere reactive)
Var = V x I sin ϕ
In case of DC parameters (DC voltage, DC current) the
momentary values are constant and the power is constant
too.
Basics
RMS VALUE
The RMS (Root Mean Square) value describes the quadratic
mean value of an AC parameter (i.e. AC voltage). In case of
sinusoidal AC voltages the RMS value is 1/√2 (0.707) of the
peak value.
CREST FACTOR
The crest factor characterises the shape of an AC parameter
signal. It is the ratio of the peak value to the RMS value
(1.414 for a sine wave).
The accuracy of the calculated RMS value depends on the
crest factor and decreases with higher crest factors. The
maximum permissible crest factor in the specification refers
to full scale of the measurement range. If only a part of the
measurement range is used (i.e. 230 V in 500 V range) the
crest factor may be significantly higher.
POWER
In case of DC parameters (DC voltage, DC current) the power
is the product of current and voltage.
Änderungen vorbehalten / Subject to change without notice
Unlike DC parameters, the momentary value of AC
parameters (which may also be superimposed on DC)
change in amount (amplitude) and sign (polarity) depends
on time. If the polarity of current and voltage is always equal
(no phase shift), the product (current x voltage) is always
positive and the power is converted completely to energy
by the load. There is no power consumption by the load
(inductive, capacitive) in case of momentary values when
(due to phase shift) the current x voltage product becomes
negative. This is called reactive power.
17
Controls and Displays
Controls and Displays
(1) POWER – pushbutton and symbols for ON (I) and OFF
(O).
After the POWER METER is switched on, the FUNCTION (4) display shows for a moment the firmware version (e.g. “1.01”) and then baud rate setting (e.g. “9600”)
of the serial port (18) will be displayed for a short time.
Then the instrument switches over to power measurement and the “WATT” (12) LED is lit.
Overflow Indication
Overflow is always indicated by flashing of the particular display. A tone signal (beeper) can be switched off or
on in the following way:
1. Switch POWER METER off (1).
2. Press the left VOLT pushbutton (8) continuously and
switch POWER METER on (1).
3. Release the left VOLT pushbutton (8) when the
“WATT” LED (12) is lit.
The actual status is stored in a non volatile memory.
RS-232 Baud Rate
The baud rate can be changed from 1200 to 9600 baud
or vice versa. To change the setting proceed as follows:
1. Switch POWER METER off (1).
2. Press the right VOLT pushbutton (9) continuously and
switch POWER METER on (1).
3. Release the left VOLT pushbutton (9) after the “WATT”
LED (12) is lit.
The actual status is stored in a non volatile memory.
(2) VOLT (Voltage) – display, shows the voltage at the output of the selected measuring circuit. The input voltage
is a little bit higher than the output voltage, due to the
precision resistor between input and output.
If the voltage is too high for the measuring range (over-
18
flow), the display shows three flashing dashes (“- - - “).
For a correct voltage display, a higher voltage range must
then be selected with the VOLT pushbutton (9). The
POWER METER automatically selects the suited voltage range by pressing the VOLT pushbutton (9) until
AUTO is lit.
(3) AMPERE (Current) – display, shows the current flow
within the selected measuring circuit.
If the current is too high for the measuring range (overflow), the display shows four flashing dashes (“- - - - “)
or a decimal point. For a correct current display, a higher
current range must then be selected with the AMPERE
pushbutton (11). The POWER METER automatically selects the suited current range by pressing the AMPERE
pushbutton (11) until AUTO is lit.
(4) FUNCTION (WATT, Var and cos j) – display indicates the
value of the selected function.
The active function is indicated by one of the WATT (12),
Var (13) or cos j (14) LEDs.
Four dashes (“- - - -“) indicate an erroneous setting of
the VOLT and/or AMPERE range which causes overflow,
when WATT (12) or Var (13) measurement is selected.
If the phase angle is not determinable when cos j (14)
measurement is chosen, the FUNCTION display show
two flashing dashes. This will be caused by one of the
following conditions:
1. no current
2. DC current
3. AC voltage and/or AC current are too small
4. VOLT and/or AMPERE measuring ranges (manually
chosen) are too high
(5) FUSE HOLDER (with fuse) for measuring circuit 1.
The fuse (very quick acting (FF)) inside protects the precision resistors in measuring circuit 1. The highest permissible current is 16 A.
Änderungen vorbehalten / Subject to change without notice
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Controls and Displays
(6) INPUT 1 / OUTPUT 1 – INPUT 2 / OUTPUT 2
selector switch.
The POWER METER contains two measuring circuits
which are independent from each other. The active measuring circuit is selected by “INPUT 1 / OUTPUT 1 – INPUT 2 / OUTPUT 2” switch (6), which is located at the
rear.
If the selector switch (6) is in “INPUT 1 / OUTPUT 1”
position, the four banana jacks (15) at the front (INPUT 1
and OUTPUT 1) are active. INPUT 2 at the rear and OUTPUT 2 at the front are active when the selector switch
(6) is set to “INPUT 2 / OUTPUT 2”.
(7) MONITOR (BNC socket) output.
The signal at this output enables the display of instantaneous power in combination with an oscilloscope, if the
WATT (12) or cos j (14) FUNCTION has been chosen.
The signal can not be evaluated in condition Var (13).
As the BNC socket is galvanically connected to chassis
and case, the reference potential at the BNC socket is
ground (PE). There is no galvanic connection to the measuring circuits and the RS-232 serial port.
The signal polarity is inverted. A positive volt x current
product is displayed on the oscilloscope screen below
the zero volt trace position. It is recommended to use
the invert function of the oscilloscope to avoid misinterpretation.
The measuring circuit temperature drift is automatically
compensated on condition that WATT (12) is selected.
How frequently the compensation is performed, depends
on the temperature condition. During a compensation
period (approx. 100 ms) the output is switched to zero
Volt. The power signal is available without interruptions
if cos j (14) is chosen, as the temperature drift compensation is switched off.
The following description applies to a signal display on
an oscilloscope with the invert function of the oscilloscope activated and explains the way to interpret the
power signal.
It must be noted, that the output signal is 2 Vrms at full
scale on each WATT measuring range. As the active
WATT range is not indicated by the POWER METER, it
must be calculated by multiplying the indicated VOLT
and AMPERE ranges.
Example:
The measurement shall take place when the 500 VOLT
range and 1.6 AMPERE range are selected, which means
that the actual power range is 800 Watt. Corresponding
to the specifications a voltage of 2 Vrms would be present
at the MONITOR output, if the load would have a power
consumption of 800 Watt.
An undistorted sinusoidal voltage of 230 V (50 Hz) shall
be applied at the measuring circuit input. The load shall
be purely ohmic, so that a phase shift between voltage
and current does not exist.
Änderungen vorbehalten / Subject to change without notice
Under these conditions the oscilloscope displays the
power consumption in form of an undistorted sinusoidal
voltage. The negative peak value will correspond with
the zero Volt trace position of the oscilloscope and the
positive peak value shall be 0.3 Volt. So the mean voltage at the MONITOR output is 0.15 V. As the 800 Watt
range is active in this example and full scale (800 Watt)
means 2 Vrms at the output, the power consumption
causing 0.15 V at the output can calculated with the equation:
800 x 0.15
X = ———————
2
The mean power consumption is 60 Watt.
Note:
Although the frequency of the AC voltage applied at the
measuring circuit input is 50 Hz, the oscilloscope displays the power consumption with a frequency of 100
Hz.
During one complete cycle of a 50Hz sine wave period,
there are two points where the power peaks, once during the positive half cycle and once during the negative
half cycle. As these two (positive) peaks occur within
one input cycle, the frequency is doubled to 100Hz and
there are thus two points of zero crossover where the
MONITOR output is 0 Volt.
(8) (9) VOLT (pushbuttons) for manual or automatic VOLT
measurement range setting and associated LEDs. Both
pushbuttons react to step by step pressing.
After the POWER METER is switched on, the AUTO
LED is lit. Depending on the measuring circuit input voltage, the instrument automatically selects the suited
measurement range and displays it on the range LED. If
the input voltage changes in such a way that the previously selected range is no longer suited, the measurement range will be changed automatically.
Pressing a VOLT (8) (9) pushbutton switches the automatic ranging unit off and the AUTO LED is no longer lit.
Thereafter the measurement range can be selected by
one of the VOLT (8) (9) pushbuttons. The automatic ranging unit can be activated again by pressing the right hand
VOLT (9) pushbutton until the AUTO LED is lit.
The VOLT display (2) indicates either the voltage applied
at the active measuring circuit or overflow if a too low
measurement range had been selected manually.
(10) (11) AMPERE (pushbuttons) for manual or automatic
AMPERE measurement range setting and associated
LEDs. Both pushbuttons react to step by step pressing.
After the POWER METER is switched on, the AUTO
LED is lit. Depending on the current value within the
measuring circuit, the instrument automatically selects
the suited measurement range and displays it on the
range LED. If the current flow changes in such a way
that the previously selected range is no longer suited,
the measurement range will be changed automatically.
19
Controls and Displays
Pressing an AMPERE (10) (11) pushbutton switches the
automatic ranging unit off and the AUTO LED is no longer
lit. Thereafter the measurement range can be selected by
one of the AMPERE (10) (11) pushbuttons. The automatic
ranging unit can be activated again by pressing the right
hand AMPERE (11) pushbutton until the AUTO LED is lit.
The AMPERE display (3) indicates either the current
within the active measuring circuit or overflow if a too
low measurement range had been selected manually.
A cos ϕ value can be displayed by the FUNCTION display (4) if AC parameters are present with sufficient
amplitude for both voltage and current (see specifications). In case of insufficient amplitude and DC content,
dashes in changing position are displayed.
Sinusoidal current and voltage is required for correct
cos ϕ measurement. As the apparent power (V x I) and
the true power (V x I x cos ϕ) are independent from the
wave form, cos ϕ can be calculated from these values in
case of non sinusoidal wave form.
(12) WATT pushbutton and associated LED.
True power measurement is selected and indicated by
the WATT LED after this pushbutton has been pressed.
Under this conditions the FUNCTION display (4) shows
the true power measurement result.
(13) VAR pushbutton and associated LED.
Pressing this pushbutton switches over to reactive power
measurement. Then the Var LED is lit and the FUNCTION display (4) indicates the reactive power and the
load type.
Reactive power caused by inductive loads is indicated
without sign (meaning “+”). In the case of a capacitive
load, the reactive power is displayed in combination with
a negative sign (“-”).
Current and voltage must be sinusoidal for correct reactive power measurement. As the apparent power (V x I)
and the true (V x I x cos ϕ) power are independent from
the wave form, the reactive power can be calculated
from these values in case of non sinusoidal wave form.
Note: In some conditions the display may cause the
wrong impression of a faulty instrument. e.g. if reactive
power is indicated although no load is applied. Please
note the instrument specification!
(14) COS ϕ pushbutton and associated LED.
After pressing this pushbutton the cos ϕ LED is lit and
the FUNCTION display (4) shows the cos ϕ measuring
result.
20
Note: In special conditions the display may cause the
wrong impression of a faulty instrument. e.g. if a value
deviating from “1” is indicated although no capacitive
or inductive load is applied. Please note the instrument
specification!
((15) INPUT 1 / OUTPUT 1
(banana jacks) measuring circuit 1.
INPUT 1 and OUTPUT 1 are the terminals of measuring
circuit 1 and not connected to earth (PE) by the POWER
METER. On condition that the selector switch (6) is set
to “INPUT 1 / OUTPUT 1”, the four (safety) banana jacks
(15) can be used for measurement. Both jacks on the
left are marked INPUT 1 for connection with the power
supply. The load must be connected to the jacks on the
right marked OUTPUT 1.
Warning!
The banana plugs may get hot during operation
after passing high currents.
The red banana jacks located in the upper position are
connected galvanically (0 Ohm). Therefore no voltage
must be applied between both jacks (short circuit)!
The precision resistor is located inside the instrument
between the banana jacks in lower position (blue, black).
Again no voltage must be applied between these jacks!
Measuring circuit 1 is protected by a fuse located in the
accessible fuse holder (5). The maximum permissible
current is 16 Ampere (fuse characteristic: very quick act-
Änderungen vorbehalten / Subject to change without notice
Controls and Displays
INPUT 2
MAX: 250V/10A
INPUT 2
OUTPUT 2
INPUT 1
OUTPUT 1
RS232
HM8115
Power Meter
GmbH
60528 FRANKFURT
Watts (max.): 15 at 230V 50Hz
AC 50 - 60Hz
Made in Germany
SERIAL PORT
Power Fuse: IEC 127-III. 5x20mm
Träge, temporisÈ, time lag, lento
230V T100mA
115 V T200mA
INTERNAL INSTRUMENT SUPPLY
ing (FF)). Use of patched fuses or short-circuiting of the
fuse holder is not permissible; HAMEG assumes no liability whatsoever for any damage caused as a result,
and all warranty claims become null and void.
Attention!
The fuse must not be changed if a voltage is applied at
the “Measuring Circuit 1” banana jacks.
The maximum permissible voltage between the INPUT
1 jacks is 500 Volt. The voltage applied at any banana
jack must not exceed 500 Vp compared to the reference potential of the POWER METER case (PE)
WARNING!
Voltages exceeding the following values may cause electrical shock:
1. 30 Vrms
2. 42.4 Vpeak
3. 60 V DC
Higher voltages may be applied only by experts who are
familiar with the risks and dangers! Safety regulations
must be noted unconditionally!
(16) OUTPUT 2 (wall outlet) measuring circuit 2.
(17) INPUT 2 (power connector with fuse holder) measur
ing circuit 2.
This measuring circuit is intended for mains/line operated single phase devices and becomes active after setting the selector switch (6) to “INPUT 2 / OUTPUT 2”.
The protective earth (PE) connector at “INPUT 2” (17)
terminal is connected with earth (PE) via the POWER
METER power cable (19). The protective earth (PE) connector of INPUT 2 is galvanically connected with the protective earth connector of OUTPUT 2.
Attention!
The maximum permissible voltage and current for measuring circuit 2 is 250 Vacand 10 Ampere.
Measuring circuit 2 is protected by two 10 Ampere fuses
(fuse characteristic: slow blow (T)) located in the fuse
Änderungen vorbehalten / Subject to change without notice
holder which is part of the power connector (17).
Attention!
The fuses must not be changed if a voltage is applied at
the INPUT 2 and/or OUTPUT 2 terminals. Thus remove
the power cable from the power connector marked “INPUT 2” prior to replacing the fuse(s). Both fuses are
externally accessible by removing the fuse cover located
above the 3 pole power connector.
The fuse holder can be released by pressing its’ plastic
retainers with the aid of a small screwdriver. The retainers are located on the right and left side of the holder
and must be pressed towards the centre. The fuses can
then be replaced and pressed in until locked on both
sides.
Use of patched fuses or short-circuiting of the fuse holder
is not permissible; HAMEG assumes no liability whatsoever for any damage caused as a result, and all warranty claims become null and void.
WARNING!
Voltages exceeding one of the following values may
cause electrical shock:
1. 30 Vrms
2. 42.4 Vpeak
3. 60 V DC
Higher voltages may be applied only by experts who are
familiar with the risks and dangers! Safety regulations
must be noted unconditionally!
(18) RS-232 Serial Port (9 pole D-Sub socket)
Hardware
The POWER METER is fitted with a serial port for data acquisition and control purposes. The serial port connector (9
pole D-Sub female) is located at the rear of the instrument.
Via this bi-directional port the POWER METER can receive
data (commands) and send data (measuring values and parameters) from/to a PC.
21
Hardware
INPUT 2
MAX: 250V/10A
INPUT 2
OUTPUT 2
INPUT 1
OUTPUT 1
RS232
Power Meter
HM8115
GmbH
60528 FRANKFURT
Watts (max.): 15 at 230V 50Hz
AC 50 - 60Hz
Made in Germany
SERIAL PORT
Power Fuse: IEC 127-III. 5x20mm
Träge, temporisÈ, time lag, lento
230V T100mA
115 V T200mA
INTERNAL INSTRUMENT SUPPLY
The connection from the PC (COM Port) to the POWER
METER (RS-232 Serial Port) can be made via a standard
extension cable (9 pole D-Sub male to 9 pole D-Sub female)
with 1:1 connection. The cable must be screened and less
then 3 meters long.
Only three wires are used. The pin connections on the
POWER METER and the 9 pole PC COM Port is as follows:
The 1:1 connection of the extension cable causes each data
output to be connected to a data input.
It is recommended to use an adapter (9 pole to 25 pole) if
the PC is equipped with a 25 pole D-Sub connector.
POWER.
Interface parameter
The RS-232 parameters are:
N, 8, 1, Xon-Xoff (no parity bit, 8 data bits, 1 stop bit, XonXoff)
Data transfer can be executed by aid of a terminal program (e.g. HyperTerminal). After the parameter settings in
the terminal program have been made, the ENTER
(0Dhex) button on the PC keyboard must be pressed
once. Then the first command can be sent.
Baudrate
Data transfer can be executed with 1200 Baud or 9600 Baud.
To change the setting proceed as described under item (1)
Pin
2
3
5
22
POWER METER
Name / Function
Tx Data / data output
Rx Data / data input
Pin 2 and 3 reference potential
Pin
2
3
5
PC COM Port (9 pole)
Name / Function
Rx Data / data input
Tx Data / data output
Pin 2 and 3 reference potential
Änderungen vorbehalten / Subject to change without notice
Commands
Commands
All commands must be sent as a string of ASCII letters
and digits. Capital and small letters are accepted. Each
command is executed after reception of 0Dhex (= ENTER
button).
Command
PC —> HM8115
*IDN?
VERSION?
STATUS?
Reply
HM8115 —> PC
HAMEG HM8115
version x.xx
function_voltage range
_current range
VAL?
range- and measuring
value (VOLT, AMPERE).
active function and
measuring value.
VAS?
VOLT- and AMPEREranges. Function and
measuring value.
VOLT- and AMPEREranges. Function and
measuring value.
MA1
MA0
WATT
VAR
COS
SET:Ux
no
no
no
no
no
SET:Ix
no
AUTO:U
AUTO:I
BEEP
BEEP0
BEEP1
FAV0
FAV1
no
no
no
no
no
no
no
Description
Identification query
Software version query. Reply i.e.: version 1.01
Query for instrument settings. Function: WATT, VAR, cos ϕ
Voltage range: U1 = 50 V, U2 = 150 V, U3 = 500 V
Current range: I1 = 0.16 A, I2 = 1.6 A, I3 = 16A
Query for instrument settings and measured values. Example for Var
active: U3=225.6E+0 (225.6 V measured in 500 V range)
I2=0.243E+0 (0.243 A measured in 1.6 A range) VAR=-23.3E+0 (reactive
power of 23.3 W with capacitive load). Range overflow is marked by “OF”
(overflow). If a command is received by the POWER METER within a
measuring cycle, the reply is sent after the measuring cycle is finished.
Query for instrument settings and measuring values of the active
function.
Example for cos ϕ active: U3, I2, cos=0.87E+0.
Continuous transmission of instrument settings and measuring values.
Example for cos j active: U3, I2, cos=0.87E+0. Range overflow is marked
by “OF” (overflow). Each measuring result is transmitted to the PC until
the POWER METER receives the command MA0.
Ends the continuous data transmission started by MA1.
Function selection: active power
Function selection: reactive power
Function selection: cos j
Selects one of the following voltage measuring ranges (VOLT) and
switches the VOLT AUTORANGE function off: x = 1 (50 V range),
2 (150 V range) or 3 (500 V range)
Selects one of the following current measuring ranges (AMPERE) and
switches the AMPERE AUTORANGE function off: x = 1 (0.16 A range),
2 (1.6 A range) or 3 (16 A range)
Activates the AUTORANGE function for voltage measurement (VOLT).
Activates the AUTORANGE function for current measurement (AMPERE).
Generates an acoustic signal.
Deactivates the acoustic signal.
Permits the acoustic signal.
Locks all VOLT, AMPERE and FUNCTION controls.
Unlocks all VOLT, AMPERE and FUNCTION controls.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement