Rotek 800 Series User manual

Rotek® Instrument Corp., 390 Main Street, Waltham, Massachusetts 02154 USA
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SERIES 800
PRECISION POWER/ENERGY
METER CALIBRATORS
17th Printing
Effective Starting Serial Number 675

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CERTIFICATION
Rotek Instrument Corp. certifies that this instrument has been calibrated to meet or exceed all
the specifications contained in this manual prior to being shipped from the factory. The calibration
has been performed with instruments, the accuracy of which are traceable to the National Institute of
Standards and Technology (N.I.S.T.) formerly known as the National Bureau of Standards (N.B.S.).
WARRANTY
Rotek Instrument Corp. warrants each instrument manufactured by it to be free from defects in
material and workmanship for a period of one year from date of delivery to the original purchaser,
provided the instrument is used in accordance with the instructions in this manual. Rotek's obligation
under this warranty is limited to servicing or adjusting an instrument returned to the factory,
transportation charges prepaid, for that purpose. This is the only warranty offered in connection with
the sale of this instrument, no other warranty is implied. Rotek is not liable for consequential
damages.
If a fault in operation occurs, the following steps should be taken:
1. Notify Rotek Instrument Corp. giving full details of the faulty operation, the model
number and serial number of the instrument. On receipt of this information, service
data or shipping instructions will be provided.
2. On receipt of the shipping instructions, forward the instrument prepaid and all
necessary repairs will be made at the factory.
If it is necessary to return this instrument to the factory, it should be shipped in the original
packing carton. If it is not available, use any suitable rigid container with adequate packing to protect
the unit during transit. Do not ship an unprotected instrument with peanuts (Pieces of foam or other
material) as packing. Always prepare an inner carton.

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TABLE OF CONTENTS
1.0 General Information ..............................................................................................................1
1.1 Description...............................................................................................................1
1.2 Models and Options.................................................................................................1
1.2.1 Model 800A Wattmeter Calibrator........................................................1
1.2.2 Model 811A Power Energy Calibrator..................................................1
1.2.3 Models 800AE and 811AE...................................................................1
1.3 Specifications...........................................................................................................2
1.3.1 Models 800A/811A...............................................................................2
1.3.2 Models 800AE/811AE..........................................................................4
2.0 Operating Instructions ...........................................................................................................5
2.1 Power Requirements ...............................................................................................5
2.2 Installation................................................................................................................5
2.3 Controls and Displays..............................................................................................5
2.4 General Operating Information ................................................................................9
2.4.1 Model 800A/800AE...............................................................................9
2.4.1.1 Entering Voltage...................................................................................11
2.4.1.2 Entering Volt-Ampere...........................................................................11
2.4.1.3 Applying Excitation...............................................................................11
2.4.1.4 Power Factor........................................................................................11
2.4.1.5 Fractional Setting..................................................................................11
2.4.1.6 Deviation Function - Error Measurement.............................................11
2.4.1.7 Use as a Voltage Source......................................................................12
2.4.1.8 Use as a Current Source......................................................................12
2.4.2 Model 811A/811AE...............................................................................12
2.4.2.1 Energy Instruments With Electrical Pulse Output ................................12
2.4.2.2 Rotating Instruments With No Pulse Output ........................................15
2.4.2.3 Rotating Instruments, Fixed Energy.....................................................18
2.4.2.4 Availability of Additional Signals...........................................................19
3.0 Theory of Operation..............................................................................................................21
3.1 Introduction ..............................................................................................................21
3.1.1 Voltage .................................................................................................21
3.1.2 Current..................................................................................................23
3.1.3 Phase Control.......................................................................................23
3.2 System Operation ....................................................................................................23
3.2.1 Voltage Function (08-800-002/1) .........................................................26
3.2.2 Current Function (08-800-002/2)..........................................................26
3.2.3 Phase Control Function (08-800-002/3)...............................................26
3.3 Controls....................................................................................................................26
3.3.1 Local Mode...........................................................................................32
3.3.1.1 Directly Applied Control Signals...........................................................32
3.3.1.2 µP Treated Signals...............................................................................32
3.3.1.3 Use of µProcessor Generated Control Signals....................................34
3.3.2 Remote Mode.......................................................................................34
4.0 MAINTENANCE....................................................................................................................35
4.1 Required Test Equipment........................................................................................35
4.2 Performance Tests...................................................................................................35
4.2.1 AC Voltage Accuracy Tests..................................................................35
4.2.2 Current Accuracy Tests........................................................................35
4.2.3 Voltage Distortion Test.........................................................................40
4.2.4. Current Distortion Tests .......................................................................40
4.2.5 Power Accuracy Tests..........................................................................40

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4.2.6 Deviation Test.......................................................................................40
4.2.7 Fractional Divider Tests........................................................................43
4.3 Calibration Procedure...............................................................................................43
4.3.1 Model 800A/811A Calibration Procedure .............................................43
4.3.2 Model 800AE/811AE Calibration Procedure ........................................48
4.3.3 Factory Adjustments.............................................................................51
4.4 Periodic Maintenance...............................................................................................51
4.4.1 Air Filter.................................................................................................51
4.4.2 Relays...................................................................................................52
4.5 Troubleshooting........................................................................................................52
4.5.1 Access...................................................................................................52
4.5.2 Power Supply Voltages.........................................................................52
4.5.3 Suspected Voltage Failure....................................................................54
4.5.4 Suspected Current Failure....................................................................58
4.5.5 Suspected Phase Function Failure.......................................................60
4.5.6 Line Synchronization Function Erratic..................................................60
4.5.7 Isolating an Analog Switch Fault...........................................................61
5.0 IEEE-488 INTERFACE..........................................................................................................63
5.1 Description................................................................................................................63
5.2 Data Entry.................................................................................................................64
5.3 Serial Poll Code........................................................................................................64
5.4 Default Conditions....................................................................................................67
5.5 Asserting the Remote State .....................................................................................67
5.6 Programming Examples...........................................................................................67
5.6.1 Initializing ..............................................................................................68
5.6.2 Establishing an Active Defined Condition.............................................68
5.6.3 Enabling Operate..................................................................................69
5.6.4 Reading the Deviation Meter Data........................................................69
5.6.5 Reading the Energy Delivered Data.....................................................69
5.6.6 Ending a Test Routine ..........................................................................70
5.6.7 Precautions...........................................................................................70
6.0 Parts List................................................................................................................................71
6.1 List of Recommended Spare Parts ..........................................................................71
6.2 Replaceable Parts....................................................................................................73
6.2.1 Front Panel Assembly...........................................................................73
6.2.2 Main Assembly......................................................................................75
6.2.3 Rear Panel Assembly ...........................................................................77
6.2.4 Relay Output Assembly ........................................................................81
6.2.5 Annunciator Assembly..........................................................................83
6.2.6 Control Logic Assembly........................................................................85
6.2.7 CVA Assembly......................................................................................91
6.2.8 Phase Control & Sense Assembly........................................................99
6.2.9 Oscillator Assembly ..............................................................................107
6.2.10 Reference Assembly.............................................................................113
6.2.11 µP/IEEE Interface .................................................................................119
6.2.12 Switch Circuits ......................................................................................123
7.0 SCHEMATICS AND LOCATION DRAWINGS......................................................................125

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1. General Information
1.1 Description
The Series 800 Power and Energy Meter Calibrators are precision sources of low distortion
alternating voltage and current, providing voltages from 11 to 749 Volts RMS and currents from 0.011
to 50 Amperes at frequencies of 50, 60, or 400Hz. The separate voltage and current outputs of the
Calibrators may be connected respectively to the voltage and current input terminals of wattmeters
and watt-hour meters for calibration. The Series 800 Calibrators have a separate control for the
phase of the current with respect to the voltage, resulting in a power factor which can be varied from
minus zero lagging through unity to plus zero leading. Through the use of the deviation control it is
possible to measure wattmeter percent error directly and display it in decimal form.
The Series 800 Calibrators have unique controls which allow the user to set the meter
excitation voltage and volt-amperes value; the excitation current is automatically determined. Entry of
voltage, volt-ampere, frequency and power factor settings may be accomplished through front panel
controls or remotely by the IEEE-488 Interface. The Series 800 Calibrators also include a Fractional
Setting control to simplify testing of meters (primarily analog) with non decimal cardinal scale points.
1.2 Models and Options
1.2.1 Model 800A Wattmeter Calibrator
The Model 800A Power Calibrator is used for the calibration and testing of wattmeters and watt
transducers. The range of voltage available coupled with the high burden capability make it suitable
for a variety of different instruments.
1.2.2 Model 811A Power Energy Calibrator
The Model 811A Power/Energy Calibrator is used for the calibration of watt/energy meters and
transducers. It has special features for delivering and displaying precise amounts of energy.
1.2.3 Models 800AE and 811AE
The 800AE and 811AE offer 100 ppm accuracy of apparent power and energy for power
factors from unity to ± zero power factor.
Operation of the 800AE and 811AE is identical to that of the Models 800A and 811A. The
Models 800AE and 811AE, however, have an Enhanced Mode which is operable over the range of
80 to 129, 160 to 279 volts and 1.1 to 5.9 amperes and at all power factors. An LED indicator is
automatically illuminated when operating in the Enhanced Mode ranges. The 811AE Power and
Energy Calibrator is ideal for testing working watt-hour standards. The 800AE power calibrator finds
application in watt and VAR transducer testing and in low power factor applications, such as motor
and transformer loss measurement calibration.
Please note that when operating in the Enhanced Mode the Fractional Setting control and the %
Deviation function are inhibited.

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1.3 Specifications
Specifications apply after 60 minutes of warm-up at ambient temperature of 25 ±5°C, a line
frequency of 50 to 60Hz, at nominal line voltage ±5%, includes loading and maintains for a period of 6
months. All specifications are described as maximum limits unless otherwise stated.
1.3.1 Models 800A/811A
Voltage Output Characteristics
Voltage Range: 11-749V RMS
2 ranges: 11-120, 121-749
Voltage Accuracy: ±(0.02% of reading +0.001% of range).
Distortion (Harmonic): 0.05% RMS for resistive loads.
0.05% reading +0.01% range RMS for inductive loads.
Rectifier loads may cause additional distortion.
Line related and other noise: 0.01% reading +0.002% range RMS.
Cycle to Cycle Instability: ±0.01% reading +0.002% range peak to peak.
Resolution: 1 Volt.
Voltage Burden: 11-120V: 300mA, 120 to 100V decreasing to 50mA at 11V.
121-279V: 145mA, 279 to 220V decreasing to 75mA at 121V.
280-750V: 45mA 749 to 700V decreasing to 15mA at 280V.
Instability: 20ppm per hour reading non cumulative.
50ppm per day reading non cumulative.
100ppm per month reading non cumulative.
Temp. Coefficient: ±(10ppm reading +2ppm range) per °C.
Line Voltage Sensitivity: ±5ppm/percent line voltage change.
Connections: Four wire.
Current Output Characteristics
Current Range: 0.011-50 Amperes.
3 Ranges: 0.011-1.0999A; 1.1-10.999A; and 11.000-50A
Current Accuracy: 0.011-10.999 Amps: ±(.025% reading at Unity PF + 100µA)
11.000-50 Amps, 50/60Hz: ±(0.035% reading + 0.001% range)
11.000-50 Amps, 400Hz: ±0.1% reading
50-75 Amps, 50/60Hz: ±0.06% reading
50-75 Amps, 400Hz: ±0.2% reading
Distortion (Harmonic): 0.05% at 1PF setting, increasing linearly to
0.15% at 0PF setting RMS.
Line related and other noise: 0.01% reading +0.001% range RMS.
Cycle to Cycle Instability: 0.05% reading +0.004% range, peak to peak.
Resolution: 0.001% of scale.

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Compliance: Max. Voltage
Current at Max. Inductance
Range Full Range 50/60 400Hz*
1.0999A 4V 5mHy 125µHy
10.999A 4V 1mHy 30µHy
50A 0.4V 10µHy 4µHy
75A (Optional) 0.1V --------- ---------
Amplitude Instability: 20ppm per hour non cumulative.
50ppm per day non cumulative.
100ppm per month non cumulative.
Temp. Coefficient: ±(15ppm reading +2ppm range) per °C.
Line Voltage Sensitivity: 10ppm/percent line voltage change.
Frequency Output Characteristics
Frequency settings: 50, 60 and 400Hz
Accuracy: ±1%
Adjustment: Vernier adjustment typically ±10%
Synchronization: Can be synchronized to power line
frequency ±3%.
Power Output Characteristics
Power Factor Range: 0 Lag to 0 Lead; 0.1PF steps
Power Accuracy: Power Accuracy
Current Power (±% of V-A Setting)
Setting Factor 50/60Hz 400Hz
<=10.999A 1 0.05 0.12
0.8 to 0.9 0.08 0.16
0 to 0.7 0.12 0.22
>10.999A: 1 0.065 0.12
0.8 to 0.9 0.095 0.16
0 to 0.7 0.135 0.22
Temp. Coefficient: ±0.002% per °C, 50/60Hz.
±0.005% per °C, 400Hz.
Energy (Model 811A and 811AE only)
Range: To 24500 Kilowatt-seconds.
Typical Resolution: 10ppm at 100 Seconds.
Events Range: To 65535 events maximum.
Maximum Event Rate: 4000Hz.

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1.3.2 1.3.2 Models 800AE/811AE
The Following Specifications for power accuracy apply to the Models 800AE and 811AE. For all
other performance specifications for these models refer to paragraph 1.3.1.
Enhanced Mode, ranges of operation
Voltage: 80-130V, 160-280V
Current: 1.1-5.999 Amperes
Max. VA: 690 VA, 80 to 130V; 1380 VA, 160 to 280V
Power Factor: 1 to 0 PF lagging and leading
Frequency: 50-60Hz
Power Accuracy 80-130V; ±50ppm + 0.03 Watts
160-280V;±50ppm + 0.06 Watts
Temperature Coefficient Additional 2ppm per °C at 1 PF
8ppm per °C < 1 PF.

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2. Operating Instructions
2.1 Power Requirements
The Series 800 Calibrators can be operated from an AC power source of 100, 120, 220 or
240 Volts (±5%), 50-60Hz. The selection of line voltage operation must be made prior to connecting
the instrument to the power source by inserting the printed circuit adapter board in the AC receptacle
assembly (located on the rear panel) with the appropriate voltage mark readable. The line fuse is
rated at 4 Amps Slow Blow, 100 or 120 volts; 2.5 Amps Slow Blow at 220 or 240 volts.
A three conductor power cable is provided and when this cable is connected to a standard
three wire outlet the instrument chassis is connected to power systems ground. This feature
prevents the instrument case from assuming voltages which are potentially hazardous to personnel.
In the event that an adapter is used to connect the three wire cable to a two wire outlet the green
(ground) adapter terminal should be connected to the power system ground.
An over temperature switch is connected in series with the AC line and mounted on the rear
panel heat sink. This feature protects the instrument from damage by removing power if the
temperature of the instrument rear panel exceeds limits.
2.2 Installation
The Series 800 Calibrator's standard configuration is bench mounted. Combination handles
and rack mounting ears are available on special order and are interchangeable with the bench
mounting handles. Suitable support must be provided for rack mounts.
2.3 Controls and Displays
Figure 2-1 illustrates the location of all front and rear panel controls, connections and
indicators. Each element of control, display or connection is numbered and a description of the
function of each appears below.
1. Power (Includes ON Indicator)
Switch to energize Calibrator.
2. Record % Deviation
Push switch which holds "% Deviation" reading internally. Sets bit 1 of the status byte on IEEE
488 Interface indicating that the instrument is prepared to transmit "% Deviation" or "volt/ampere
seconds" reading over IEEE 488 bus.
3. Vernier Frequency Control
4. Vernier ON Selector
The vernier selector (a push-push switch) enables the Vernier Control. The Vernier Control
permits variation of the frequency around the selected frequency by approximately ±10%. This
function must be OFF for line synchronization operation,

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5. Frequency Selection Controls
Three controls select 50, 60 or 400Hz output frequency.
6. Power Factor Control, Lead/Lag Selector, Indicator
A rotary switch selects power factor in steps of 0.1PF over the range 0 to 1. Switch selects either
current leading voltage or current lagging voltage. The indicator is illuminator for PF < 1.
7. Operate/Standby Controls
Two independent momentary push switches, red for Operate and green for Standby. Pushing
the Operate control causes excitation at the output terminals. Pushing the Standby control
removes the excitation. Red (for Operate) and green (for Standby) LED indicators display the
existing state.
8. Keypad
Used to enter voltage, volt-amperes, volt-ampere second or number of events values. The
keypad also incudes keys to enter data, reset the calibrator, and initiate the event count mode of
energy testing.
9. Current Output Terminals
These terminals are used to connect the Series 800 Calibrator to the current coil of the unit under
test. The red terminal is high and the black terminal is low. The current output low terminal is
isolated from the voltage output low terminal. Mating connectors are part number PP100GR and
PP100GB, Superior Electric.
10. Voltage Output Terminals
Output terminals High and Low are connected to the voltage coil or input of the unit under test.
Sense High and Low terminals may be used for a four wire connection, or otherwise are shorted
to their respective output terminals. Mating connectors are part number 23.3000-1 and 23.3000-
4, Interlok.
11. Overload Indicator
This LED is illuminated whenever a current is drawn from the voltage terminals or a voltage is
allowed at the current terminals, which is large enough to cause errors.
12. External Sense
This LED is illuminated when a four wire connection is selected.
13. Voltage Display
Displays the three digit value of the output voltage setting which has been entered through the
keypad. Displays ROM revision level immediately after power up.
14. Volt-Ampere-Second/Events (811A only)
Displays the five digit value of volt-ampere-seconds or the number of events setting which has
been entered through the keypad.
15. Current Display
Displays the value of the current setting, computed from the entries of volt-amperes and voltage.
Displays IEEE-488 address code immediately after power up.
16. Kilovolt-Ampere-Second Multiplier Indicator (811A only)
This LED is illuminated when the value of energy is expressed in kilovolt-ampere-seconds.