Tequipment 9840 User manual

Model 9840 and 9841
AC Voltage/Current/Power
Calibrator
User's Manual

CONTENTS
1. General Description……………………………………………… 2
2. Specifications…………………………………………………….. 3
3. Precautions……………………………………………………….. 4
4. Operation………………………………………………………….. 5
5. 3 Phase configuration…...………………………….…………….. 8
6. Re-Calibration, Guarantee and Servicing…………..…………… 9
Page 1

1. GENERAL DESCRIPTION
Calibrators 9840 and 9841 are single phase sources of alternating current and voltage.
Providing voltages in four ranges, 57-110-220-380 -500V
Current up to 20A (100A for the 9841) in ranges 1-5-20A and 100A(9841).
Frequency in the range 45 to 70Hz.
Phase angle in range -90…0…+90 deg.
Total harmonic distortion (thd) pre-settable from 1% to 15%.
The Calibrators are manufactured in following options:
9840 - Standard single phase source with current range up to 20A
9841 - Single phase source with additional 100A current range
9845 - Three phase symmetrical source with current range up to 20A
9846 - Three phase symmetrical source with additional 100A current range
9847 - Three phase asymmetrical source with current range up to 20A
9848 - Three phase asymmetrical source with additional 100A current range.
The 9840 series calibrators are used for adjusting, checking and verification of
measuring instruments used in power engineering e.g. active and reactive power meters,
phase meters, frequency meters, ammeters, voltmeters, transducers, monitoring systems,
and frequency, voltage and current relays.
It is constructed in standard 19” aluminum case. Voltage and current output signals are
set up in precision way by means of multi turns potentiometers and are simultaneously
indicated on 4.5 digits led indicators. Frequency and phase angle are also set up by means of
multi turns potentiometers and are also both indicating on 4 digits LED indicators.
Connecting instruments to the output terminals can be safely made without changing
the set up values since the calibrator can be switched to ‘standby’ mode, which isolates the
signals from the output terminals.
Sinusoidal signals are be generated on both voltage and current outputs. If required
between 1% and 15% harmonic distortion can be added to the signals. This is determined by
the setting of a pre-settable trimmer on the front panel. The distortion is square wave at 3
times the fundamental frequency.
Page 2

2. SPECIFICATIONS
Table 3.1. Accuracy
Table 3.2. Operating conditions
Table 3.3. General
Page 3
Parameter Range Settings Span Resolution Accuracy Maximum Load
Voltage
57V 0.5 - 60V 0.01V 250mA@60V
110V 1.00 - 125V 0.01V ±0.05% of set
value ±3 digits
140mA@130V
220V 2.0 - 250V 0.1V 70mA@250V
500V 3.0 - 520V 0,1V 40mA@420V
Current
1A 0.01 - 1.3A 0.0001A [email protected]A
5A 0.05 - 6A 0.001A ±0.05% of set
value ±3 digits
3V@6A
20A 0.2 - 20A 0.001A 1V@20A
100A (9841) 1 - 100A 0.01A 0.7/0.3V@50/100A
Frequency 45 - 70Hz 0.01Hz ±0.02Hz
Phase 0.0 - +/-90.0 deg 0.1 deg ±0.5 deg*
Total Harmonic Distortion (adjustable 1 - 15%)
Dimensions (width x height x depth ) 478 x 194 x 342 mm / 14Kg
Power Supply 230V±10% / 50Hz 200VA, 110V option
* for settings greater than 10% of voltage and current range
0.5% of set value
Parameter Operating conditions
Ambient temperature +5...+40 deg C
Atmospheric pressure 70...106kPa
Relative humidity 20…80% non-condensing
Power supply voltage 230V ±10% 50Hz +/-5Hz. 110V 60Hz optional
Power supply freq 45…65Hz
Power supply w/form Sine, distortion factor <0.05
Warm up time 30 min
Parameter Requirement
Safety Class 1 according to EN61010
Insulation (50Hz) power supply pins – case 1.5kV
Voltage and current output terminals – case 2kV
Voltage output terminals – current output terminals 2kV
Control D-sub connection – case 500V
Degrees of protection electrical equipment IP20 according to IEC529
Climatic conditions Group I according to IEC359
Power consumption 200VA max
Dimensions (with/height/depth), Weight 478/194/342mm, 14kg

3. PRECAUTIONS
The calibrator should be used in an environment according to table 3.2 and where
apparatus will be handled carefully.
The calibrator should not be used near aggressive gases and strong magnetic and
electric fields.
Operation is allowable according to IEC359 for instruments group 1. It can be used in
temperatures from +5 to +40 deg C and stored/transported at temperatures from -25 to +70
deg C.
The calibrator is a Class 1 protection instrument according to EN61010. Its metal case is
connected to the earth lead of the power cable.
SAFETY WARNING:
The calibrator generates high and dangerous voltages. Connection and disconnection of
the load should only be made when “standby” mode has been set (“std” lamp is flashing).
After changing the load, the output can be re-connected by pressing the “std” press button.
Changing the load without switching to the “standby” mode is dangerous.
A similar procedure applies when changing the ‘current’ load. Changing the load at high
currents without entering standby can cause arcing/burns and can generate potentially
dangerous transients.
The calibrator is protected on it’s main power input by a mains fuse (type T 1.6A) which is
located on the rear panel next to the power connection socket. For 110v operation the fuse is
increased to T 3.15A
Page 4

“power” Supply switch, connects the input power to the calibrator
“output voltage” Output voltage terminals: high potential “HI” and low potential “LO”. There
is a pushbutton and the indicator for standby/operate function next to the
terminals. Indicator flashing is “standby” mode and the output voltage is
disconnected. Indicator off is “operate” mode when voltage is connected to
the output terminals. The “ovl” indicator shows overload of the output i.e.
exceeding the maximum allowed load current – see specification.
“output current” Output current terminal: high potential “HI” and low potential “LO”. The
output current is electrically separated from all other circuits of
calibrator. There is a pushbutton and indicator lamp for standby/operate
modes next to the terminals. The operation is identical in function to that
described above for voltage. The “ovl” indicator shows when the calibrator
is unable to supply enough voltage drive to maintain the set current – see
specification.
“frequency” The frequency of current and voltage signals is set up by the control knob.
There are the pushbutton and the signal indicator for “synch” function.
Pressing the pushbutton alternates from ‘synch’ mode to ‘adjustable’ mode.
In both modes the frequency is shown on the display. In ‘synch’ mode both
voltage and current signals are synchronized with the incoming mains
power frequency.
Please note that the set output voltage and current will change when
‘synch’ mode is selected. This is normal and should not cause problems
since calibration should either be done in the adjustable frequency or fixed
frequency mode. It is not recommended to switch modes during a normal
calibration
4. OPERATION Page 5

“phase” Phase angle between current and voltage signals is set up by the control
knob. Pressing the pushbutton below the display selects the range of
phase. When the indicator “L” light is on, the range is 0 to +90 and when
the indicator “C” light is on, the range is 0 to -90. In both case the value
and sign of phase are shown on display. Note that all ranges allow the
output to be set above the range full scale to allow overlap between
ranges.
“voltage” The amplitude of the voltage signal is set up by two control knobs (coarse
and fine). Pressing the pushbutton below the display selects the range of
voltage, 57V, 110V, 220V or 500V.
“current” The amplitude of the current signal is set up by two control knobs (coarse
and fine). Pressing the pushbutton below the display selects the range of
current, 1A, 5A, 20A or 100A. Switching on/off the 100A current range
operates a high current relay inside the calibrator. The operation of the
relay can be heard by the operator.
“distortion” The total harmonic distortion (thd) content of current and voltage signals
can be set up by means of pre-set trimmer control on the front panel.
Pressing the pushbutton selects thd on or off, and this is shown by an
indicator lamp. The output voltage and current signals can be distorted
from 1% to 15% with the third harmonic signals. The distortion spectrum
corresponds to a square wave at triple frequency. If a precise level of
distortion is required, a distortion analyzer should be connected to the
output while the trimmer is adjusted.
On the rear panel are:
Power supply socket 230V+/-10% at 50Hz/60Hz +/-5%. 110V +/-10% 60Hz, on order option.
Power supply fuse is slow blow rated at 1.6A/230V, or 3.15A/110V
Socket DB25 (used to three phase set)
Power supply voltage and frequency must be consistent with the details stated in
the specifications (Chapter 3). To avoid shock hazard or instrument damage, ensure that the
calibrator power ground is connected to earth ground on the correct pin. A factory-supplied,
three-conductor power cord, is supplied with the calibrator.
After switching on the power, for safety reasons, the calibrator’s output current and voltage
terminals are automatically switched to standby mode. The set value of current, voltage
frequency and phase are shown on the displays. Warming up of the calibrator should take no
longer than 30 minutes. After this time the calibrator is ready for use and performance will be to
specification.
Page 6

Example load connection - for calibrating electricity meters
Fig.5.2. Connection of wattmeter to calibrator terminals
When connecting or disconnecting the loads please comply with the guidelines shown in
Section 4 - PRECAUTIONS.
When the calibrator goes into overload the “ovl” indicator will flash. The calibrator then
automatically switches to the standby mode and disconnects the signals from the output
terminals. Overload on voltage output can be caused by exceeding the current limit (i.e. by
connecting a load which is too low in resistance) – see specification.
Current overload is indicated similarly and can be caused by demanding too high a drive
voltage (i.e. by connecting a load with too high a resistance) – see specification.
Overload on both voltage and current output can be also caused by connecting non-
linear loads.
The average rectified value of alternating signals is stabilized on the calibrator output but
it is calibrated as a sinusoidal signals RMS value. Accuracy of voltage, current and phase
angle are described in table 3.1. They are true when the distortions are low and “THD” output
is switched off.
Calibrator
Met er Under Test
HI
LO
HI
LO
output voltage
output current
*
*
Page 7

5. THREE PHASE CALIBRATOR SET
Calibrator 9840/41 can work as a main controller for a three phase set.
Two additional slave units are linked by rear panel connections.
Three phase calibrator configuration
Page 8
Shift angle between voltage signal 120.0° with error ±1.0° **
Difference between output voltage in any case
and average voltage value
±1% setting value
Difference between output current in any case
and average current value
±1% setting value
Difference phase shift between voltage output
and suitable phase shift any current output
±1.0° **
** for values greater than 10% of the voltage
and current ranges

6. RE-CALIBRATION, GUARANTEE, AND SERVICING
Re-Calibration:
The 9840/41 should be returned to Time Electronics or their authorised dealer for repair
or recalibration.
Guarantee Period
This unit is guaranteed against defects in materials and workmanship for a period of
one year from its delivery to the customer.
We maintain comprehensive after sales facilities and the unit can, if necessary be re-
turned to us for servicing.
During this period, we will at our discretion repair or replace the defective item.
For servicing under guarantee, the instrument type and serial number must always be
quoted, together with details of any fault and the service required. The purchaser of the
instrument must pay all shipping charges to manufacturer. We will pay return shipping
charges.
This guarantee is void if servicing has been attempted by an unauthorised person or
agent.
If during the guarantee period, failure is due to misuse or abuse of the unit, the repair
will be put in hand without delay and charged unless other instructions are received.
Service After Guarantee Period
Even after the guarantee period has expired, we can still recalibrate and service your
instrument.
As the manufacturer, we have the specialised knowledge needed to keep your instru-
ment in peak condition and we also maintain a comprehensive spare parts service.
Please enclose details of the service required and your full company details including a
contact name.
Returning Instruments
When returning instruments, please ensure that they have been adequately packed,
preferably in the original packing supplied. We will not accept responsibility for
units returned damaged.
Please ensure that all units have details of the service required and all relevant paper-
work including contact name, address and telephone number.
Send the instrument, shipping charges prepaid to:-
age 9