Model 1133A Power Sentinel™

Model 1133A Power Sentinel™

A leader in synchrophasor measurement and analysis, Model 1133A Power Sentinel™ merges precision time synchronization and power measurement features into a single PMU compatible device.


Model 1133A User Manual
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Model 1133A Quick Setup Guide
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Model 1133A Power Sentinel™ Data Sheet
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Model 1133A Power Sentinel™ Data Sheet Español
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Bridging the gap between Precision Timing and Power Quality Measurement, Model 1133A Power Sentinel™ delivers practically unlimited functionality to the electric power professional. Compliant with IEEE C37.118, Model 1133A is a rack mountable Phasor Measurement Unit (PMU) compatible device featuring the highest accuracy possible.

Functionally, the unit provides exceptional support for synchronized timing applications enabling Model 1133A to take a leadership role in synchrophasor measurement and analysis. Measure system phase angle, monitor power quality, derive frequency and time deviations and tackle revenue metering challenges from a single unit. The advanced technology, featuring Arbiter's proprietary EnergyDSA™ Digital Signal Analysis technology makes all of this - and more - possible.

Accéder au résumé en français  

  • IEEE C37.118.1-2005 compatible PMU device
  • Synchronized via internal GPS Satellite receiver
  • Market leading synchrophasor support
  • Revenue Accuracy: 0.025 %
  • Power Quality: Harmonics, Flicker, Interruptions
  • Phasor Measurements for Stability & Flow Analysis
  • System Time & Frequency Deviation
  • Internal Data/Event Logging
  • Two Year Warranty to the original owner/purchaser



3 Ø:

3-element, 2½-element, 2-element, selectable

1 Ø:

2-element, 1½-element, and 1-element, selectable


Range (3 Ø/1 Ø)

0 Vrms to 69 Vrms, 120 Vrms, 240 Vrms, or 480 Vrms, selectable (phase-to-phase for 2 element; phase-to-neutral for 2½ element and 3 element)


88 Vrms, 175 Vrms, 350 Vrms, or 700 Vrms, nominal


Range (3 Ø/1 Ø)

2.5 Arms, 5 Arms, 10 Arms, or 20 Arms, selectable, per element


2.9 Arms, 5.9 Arms, 11.7 Arms, or 23.5 Arms, nominal (maximum continuous input current: 20 Arms per element)



Product of rated voltage and current ranges and number of elements (2½ (3 Ø) and 1½ (1 Ø) element, use 3 and 1, respectively)


CT and PT

Both magnitude and phase compensation, CT with 12 point nonlinear interpolation


Both iron and copper compensation



45 Hz to 65 Hz, for specified accuracy


To 3 kHz



400 volts, nominal, to neutral/chassis, surge voltage class III
600 volts, nominal, to neutral/chassis, surge voltage class II

Contact Technical Support for more detailed information


Removable screw-clamp terminal block, accepting 0.2 mm to 4 mm2 (#24 to #10 AWG) solid or stranded conductors

Power Quality

Harmonics Measurement


Per IEC 61000-4-7, 100 ms overlapping data window


THD, K-factor, rms harmonic current and voltage, rms harmonic current and voltage with K-factor compensation (each harmonic magnitude is multiplied by the square of the harmonic number before summing), individual magnitude and phase

Logged Data

Selectable, may be regularly logged or registered; or event-logged when user-specified limits are exceeded

Interruptions Logged Data

Selectable, may be regularly logged or registered; or event-logged when user-specified limits are exceeded



Per IEC 61000-4-15, Pst and Instantaneous

Logged Data

Selectable, may be regularly logged or registered; or event-logged when user-specified limits are exceeded

Limit Alarms


Upper or lower limits may be set on most measured functions. Limits may also be set on maximum imbalance


Via system interface and display or contact closure


Accuracy Note

Note: Accuracy specifications include all sources of uncertainty. Except as noted, specifications apply for the full operating range, including temperature (- 10 °C to + 50 °C), line voltage, input range including specified overrange, power factor, input frequency, and drifts over a one-year calibration interval. Specifications assume synchronization to GPS and operation in 3-element mode or in a well-balanced system where imbalance does not degrade accuracy.


0.025 % of reading, 10 % of range or greater and PF > 0.2
0.005 % of VA for PF < 0.2


0.0025 % of range, below 10 % of range


0.02 % of reading or 0.002 % range, whichever is greater


0.03 % of reading or 0.003 % range, whichever is greater


0.04 % of reading or 0.004 % range, whichever is greater


0.06 % of reading or 0.006 % range, whichever is greater

Phase Angle, Ø

0.01 °, phase-to-phase or voltage-to-current, 10 % of range minimum


Same as W, Wh except no PF effect


Same as W, Wh except replace PF with (1 - PF2)0.5

Power Factor

0.0002 · sin (Ø), 10 % of range minimum


0.05 % THD or 5 % of reading, whichever is greater


< 1 ppm (0.0001 %) of reading, 50 Hz or 60 Hz nominal, plus timebase error



0.03 ° plus [timebase error · 360 ° · frequency]


1 µs plus timebase error

Event Inputs

± 10 µs (typical)

Flash Memory Data Storage

Host Processor


32 megabytes standard; number of records stored depends on data items selected. See Operation Manual for record length and capacity calculations


Selectable from all functions measured and totalized by the Model 1133A; each record is stored with a time tag

Storage Rate

Selectable; default is 15 minutes. Other intervals as short as one minute may be selected. Event data stored upon occurrence.


100,000 storage cycles minimum

Data Retention

Indefinite; no power or battery is required to retain data

System Control and Monitoring

System Time, Phase and Frequency

System Time

Unlimited accumulation with ± 1 µs resolution


7 digits, xx.xxxxx Hz

System Phase

0 ° to 360 ° with 0.01 ° resolution

Effect of DC & Harmonics

None; Rejected by narrow band digital filtering



Per IEEE 1344, IEEE C37.118, or PSCSV


Selectable: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 measurements/second for 60 Hz or 1, 2, 5, 10, 25, 50 measurements/second for 50 Hz. Including df/dt.



Status LEDs

Operate (green), Time Set (green), Alarm (red), Fault (red)


2 character x 20 character LCD display


8 key for status and setup


Serial Port 1

RJ-11 modular connector
RS-232 (1133opt10)
RS-422/485 half-duplex (1133opt11)
Modem (V.34bis, 33.6k) (1133opt12)

Serial Port 2

RJ-11 modular connector
RS-232 (1133opt20)
RS-422/485 half-duplex (1133opt21)
Modem (V.34bis, 33.6k) (1133opt22)

Ethernet Connector

One RJ-45 modular connector
10Base-T per IEEE 802.3i



PowerSentinelCSV (PSCSV)



Programmable Contact Outputs

Type and Number

Form C (SPDT), four (4) sets


Pluggable 12-pole 5 mm terminal strip, with four, 3-pole mating connectors included


250 Vac/125 Vdc, 8 A maximum, 2000 VA/150 W maximum


4000 Vrms for 1 minute to chassis
Optional KYZ (solid state) contact isolation: 3750 Vrms Input/Output

Functions, Selectable

Programmable Load Control, with preset times or via system interface
Fault Fail-safe (faulted with power off)
Alarm Fail-safe
Out-of-Lock Fail-safe
One Pulse per Hour; contacts closed for one minute at top of hour
Optional KYZ contacts
Other Functions, as required

Event Inputs

Type and Number

Four, optically-isolated 24 Vdc to 240 Vdc (may be configured for 5 volt logic level)


Pluggable 8-pole 5 mm terminal strip, with four, 2 pole mating connectors


4000 Vrms for 1 minute to chassis


1 µs



GPS Tracking

GPS-L1 (1575.42 MHz); 12 channel (tracks up to 12 satellites)

GPS Acquisition

2 minutes typical

GPS Accuracy

UTC-USNO ± 1 µs (only need 1 satellite with correct position)

GPS Out of Lock

Via system interface and status

Timebase Error

GPS Locked

Less than 1 µs, when locked to at least one satellite with correct position


10 ppm, typical, after being locked for 10 minutes minimum (< 1 second/day unlocked, typical)



0.75 in NPT pipe thread (1 in - 14 marine type) mount


80 mm hex (across flats) x 84 mm tall (3.2 in x 3.3 in), including connector


170g (6.0 oz.)




15 m (50 ft) included; longer cables optionally available

Synchronization Output


One; IRIG-B004 or IRIG-B003 per C37.118 (unmodulated or level-shift); 200 mA peak; pluggable 5 mm terminal strip with mating connector, two-pole




1 RU (430 mm W x 44 mm H) rack mount or tabletop; 260 mm deep FMS. Rack mounts included.
508 mm x 381 mm x 203 mm (20 in x 15 in x 8 in), shipping


2 kg (4.5 lbs), net
5.5 kg (12 lbs), shipping



Operating: - 10 °C to + 50 °C
Nonoperating: - 40 °C to + 85 °C



Power Requirements

External Power


Terminal strip with fuse; surge withstand per ANSI C37-90.1 and IEC801-4 standard



85 Vac to 264 Vac, 47 Hz to 63 Hz or 120 Vdc to 275 Vdc, 5 VA typical

Certificates and Approvals

  • Compliance to IEC-687 International Standard for Alternating Current Static Watthour Meter for Active Energy
  • Compliance to IEEE C37.118.1-2005 Standard for Synchrophasors for Power Systems
  • Certificate of Conformance to NIST
  • CE mark/label and certificate
1133opt07 IRIG-B input (C37.118 or C37.118.1): Replaces GPS receiver (1133A)
1133opt10 RS-232 (Port 1 - 1133A)
1133opt11 RS-422/485 half-duplex (Port 1 - 1133A)
1133opt12 Modem (V.34bis, 33.6k) (Port 1 - 1133A)
1133opt20 RS-232 (Port 2 - 1133A)
1133opt21 RS-422/485 half-duplex (Port 2 - 1133A)
1133opt22 Modem (V.34bis, 33.6k) (Port 2 - 1133A)
1133opt05 Mechanical output relays
1133opt06 Solid-State output relays (KYZ)
1133opt03 85 Vac to 250 Vac RMS, 110 Vdc to 350 Vdc Terminal Power Strip and Surge Withstand
1133opt04 10 Vdc to 60 Vdc (operational) - 12 Vdc to 60 Vdc (rated) Terminal Power Strip and Surge Withstand
AP0007700 Modular DB-9 to RJ-11 Adapter, Preconfigured
AP0007900 Modular DB9 to RJ-11 Adapter, Unconfigured
AS0028200 19 Inch Rack Mount Kit
AS0087800 Arbiter GPS Active Timing Antenna
CA0021315 1 15 m (50 ft) RG-6 Antenna Cable, RoHS
CA0023600 RJ-11 Cable Four-Pin Crossed, 2 m (7 ft)
CN0019202 Mating Connectors, 2-pole, 5 mm
CN0019203 Mating Connectors, 3-pole, 5 mm
CN0030004 Mating Connector, Voltage Input
CN0030006 Mating Connector, Current Input
PD0055600 Quick Setup Guide (1133)
AP0003400 2 BNC (Male) Breakout to 100 mm Wires
AP0008900 2 BNC (Female) Breakout to 100 mm Wires
AP0014900 2 BNC (Female) Breakout to Screw Terminal
AP0015000 2 BNC (Male) Breakout to Screw Terminal
AS0044600 Antenna Mounting Kit
AS0044700 3 21 dB In-Line Pre-amplifier
AS0048900 Antenna Grounding Block Kit, RoHS
AS0056600 24 Inch Rack Mount Kit
AS0058400 Operation Manual (1133)
AS0085000 1133A Current/Voltage Input Ring Terminal Adapter
AS0085100 1133A Current/Voltage Input Ring Terminal Adapter with EMI/RFI Shielding
AS0094500 GNSS Surge Protector
CA0021330 1 30 m (100 ft) RG-6 Antenna Cable, RoHS
CA0021345 1 45 m (150 ft) RG-6 Antenna Cable, RoHS
CA0021360 1 60 m (200 ft) RG-6 Antenna Cable, RoHS
CA0021375 1 75 m (250 ft) RG-6 Antenna Cable, RoHS
CN0027800 Type F, Male, RG-11 Antenna Cable Crimp-on Connector
CN0050700 Type F, Male, RG-6 Antenna Cable Compression Connector, RoHS
CN0050800 4 Type F, Male, RG-6 Plenum Rated Antenna Cable Compression Connector, RoHS
TF0006000 Type F, RG-11 Antenna Cable Crimp Tool
TF0013200 Antenna Cable Stripping Tool, RG-6
TF0013300 Antenna Cable Stripping Tool, RG-11
TF0024000 Type F, RG-6 Antenna Cable Compression Tool
WC0004900 1 300 m (1000 ft) Roll RG-11 Cable
WC0005000 1 300 m (1000 ft) Roll RG-6 Cable
WC0005200 5 300 m (1000 ft) Roll RG-6 Plenum Rated Cable
WC0006400 22-12P STR TNC 150 V 80 C Unshielded Cable
WC0006600 IRIG-B Distribution Cable (custom length)

1 Stocked length. Custom lengths available from 0.3 m (1 ft) to 300 m (1000 ft). Contact factory.
2 Converts pair of wires to BNC.
3 Used for cable lengths greater than: RG-6 75 m (250 ft) ; RG-11 120 m (400 ft)
4 Indoor use only. Not weather resistant. Not UV radiation protected.
5 Stocked length. Custom lengths available from 0.3 m (1 ft) to 300 m (1000 ft). Contact factory. Indoor use only. Not weather resistant. Not UV radiation protected.


  • PSCSV_setup_v1103 (1.4 MB) Version 1.103 released July 13, 2007.
  • A previous release of PSCSV that allows you to open older data files that are not compatible with the latest PSCSV release.
  • To install, run the downloaded file.
Click to Download Latest Version of Software
1133_PSCSV_17Jun2013_1132 Configuration Utility
1133_Uploader_17Feb2010_0050 For use with uploading 1133 firmware.
1133_WindowFunction_0.0.3.0 Allows the user to evaluate each window function against the requirements of the Phasor Measurement Unit (PMU) application by simulating the performance of the various filters available.


Software Version and Related Information

Other Software

PMU Connection Tester (NOTE: This is an External Link) The PMU Connection Tester application verifies that the data stream from any known phasor measurement device is being received. Supports the following phasor data protocols: IEEE C37.118 (Version 1/Draft 7, Draft 6), IEEE 1344, BPA PDCstream, SEL Fast Message, FNET streaming data protocol and Macrodyne. It is also part of the openPDC family of products.

openPDC (NOTE: This is an External Link) The openPDC is a complete Phasor Data Concentrator software system designed to process streaming time-series data in real-time. Measured data gathered with GPS-time from many hundreds of input sources is time-sorted and provided to user defined actions as well as to custom outputs for archival. They also have a PMU Connection Tester.

Security Information

Security features and definition are available in the Operations Manual, Chapter 7.14


Reading Older Documents

If you are having trouble reading old documents created with previous version of the software, try renaming the document's extension to match the new extensions:


Pre Beta Extension

Beta Extension

Broadcast Data



Revenue Data




All versions greater than 0.700 are completely incompatible with firmware earlier than 25 OCT 2000. All previously saved data files will not be recognized. If you have a unit with firmware dated earlier than 25 OCT 2000, you must send your unit back in.


If you are having trouble connecting to Model 1133A, refer to the Operation Manual, Chapter 7.14 for security information.

RS232 Support

Problem programs

Two styles of programs that may cause interfere with the communication of the 1133A are identified.

  1. Palm Hotsync: If Hotsync is configured to connect to a device over the RS-232 port then Hotsync must be turned off before trying to connect to an 1133A because Hotsync software will not share the RS-232 port making it impossible to connect to an 1133A.
  2. Virus scanners: Virus scanners with real-time file monitoring features turned on may cause delays in receiving data. The PSCSV program creates a file on the computer hard drive and constantly writes to the created file during broadcasts or data downloads. If there is a large quantity of data the virus scanner cannot keep up with the data flow.

The solution is to turn off the real-time file monitoring feature.

Bandwidth Limitations

The default baud rate for 1133's and PSCSV is set to 38400 (to minimize the serial driver problem below). This baud rate does not have enough bandwidth to download broadcast waveform data (see the table below).

Data Type Required Bandwidth
Basic Broadcast 24 - 244
Energy Broadcast 22 - 182
Harmonics Broadcast 92 - 2492
Phasor Broadcast 920
Summ Harm Broadcast 20 - 140
Waveform Broadcast 7960


Baud *Available Bandwidth
115200 11520
57600 5760
38400 3840
28800 2880
19200 1920
14400 1440
9600 960

* Assumes 8 Data bits, No Parity, 1 Stop Bit

Windows Serial Driver Support

The default Win32 serial drivers are not capable of reliably sustaining baud rates of 57600 or better. If PSCSV detects any hardware and or serial driver communication errors it updates the status bar thus:

If you see RECV ERRs, then you should configure your unit to use a lower baud rate.

Changing an 1133's baud rate

  1. Using the current connection, configure the unit's comm ports (Connection, Configure, Communication Ports). Change the baud rate on the correct port.
  2. Click OK.
  3. Close the current connection (Connection, Close).
  4. Create a new RS232 connection (Connection, New).
  5. Select Serial Port. Make sure that the baud rate is set to the same baud rate as the unit.
  6. Click Next.
  7. Name the new connection by typing in a name under "Save Connection As". I recommend putting the baud rate in as part of the name.
  8. Click Finish.
  9. Answer Yes to the question about opening the new connection. This is necessary because the old connection will not work any more because the baud rate of the established connection in PSCSV is not that of the 1133A.

Steps to determine Processor Type:

  1. Download the Firmware Uploader.
  2. Run the Firmware Uploader.
  3. Click Tools.
  4. Click Processor Type.
  5. A window will pop up indicating the Processor Type.
  6. If the Processor Type is 168 then you have the latest mother board and the firmware and Firmware Updater are compatible.
  7. If the Processor Type is 167 then you have an old mother board and require an upgrade. Contact the factory for information.


Run PSCSV and connect to the 1133A.

  1. Click on Connection.
  2. Click on Information. A window with the Firmware version and DSP version should pop up.


System Requirements:

  • CPU: 486 or better.
  • Operating system: Windows XP and newer. Click here for Arbiter software installation guidelines for Windows Vista, 7, and 8.
  • Common Controls v4.71 or better.
VersionRev LevelVersion Notes
17Jun2013 1.132
  1. Migrated to new installer so it is in line with the PSCSV installer for the Model 933A.
  2. Updated copyright to 2013
23Feb2012 1.131
  1. Fixed scaling error on waveform graphs when used with large factor value.
27Apr2010 1.129
  1. Fixed problem where the program was treating the broadcast file save as dialog as if the "limit file size" checkbox was always checked and limiting the file size to the last known limit (or default of about 1hr).


VersionRev LevelVersion Notes

Required with firmware update 09Feb2010 v.4.12

  1. Add start-up warning splash screen (warn user about that upload shouldn't be interrupted)
  2. Update Linux serial port search to work with Debian
  3. Add capability to run on 64-bit operating systems.

Utility (1133_WindowFunction)

The WindowFunction.exe program helps determine which window selection (Estimator Algorithm and Window Length) works best for the Phasor Measurement Unit (PMU) installation. The program displays up to four concurrent selections and allows for changes to the nominal frequency, window type, length of window, and plot type. Everything needed to evaluate and fine-tune the PMU configuration.

VersionRev LevelVersion Notes

Initial release.

Older Firmware and Uploader

Firmware Information (EPROM based firmware is not available for download)
1133_Firmware_07Dec2016_440 Downloadable. Requires 1133uploader.


Firmware Version and Related Information

Model 1133A Firmware

  • Read the release notes BEFORE downloading any firmware.
  • You need the Firmware Uploader along with this file in order to update your Model 1133A ROM.
  • Not compatible with early 1133A mother boards. The Firmware Uploader will not upload data to Processor Type: '167'. See below for checking Processor Type

Firmware Uploader

  • Software that upgrades an 1133 via a serial port or interface card.

How do I find my firmware revisions?

From the 1133A front panel:

Press and hold the STATUS/TIME button until you see the display flash (about 3 seconds). The display should now show the Serial Number, ROM DATE, and DSP. If this information is not displayed then press and release (do not hold) the STATUS/TIME button to scroll through the display choices. The ROM DATE is the Host Processor firmware revision and the DSP is the DSP Processor firmware revision.

To return to the normal STATUS/TIME display, press and hold the STATUS/TIME button until you see the display flash (about 3 seconds).


Run PSCSV and connect to the 1133A.

  1. Click on Connection.
  2. Click on Information. A window with the Firmware version and DSP version should pop up.

Downloadable firmware (1133_Firmware)

VersionRev LevelVersion Notes
07Dec2016 4.40

Updates are not security related.

  1. Corrected leap second operation for IRIG-B and PMU data (C37.118).
  2. DST updated to match new US time changes established in 2007.
10Nov2014 4.31
  1. Fixed Vorne output addresses 33 and 34 format (reference BZ728).
19Aug2013 4.30
  1. Fixes for the 32 MB flash memory card.
11Jun2012 4.21
  1. Fixed Ethernet issues (reference BZ690 and BZ695).
09Jun2011 4.20
  1. C37.118 Digital Channels: External input events were not working. (reference BZ 659).
  2. All relays set to On when configuring the relay On/Off schedule (reference BZ 666).
  3. Ethernet update:  Fix problem associated with TCP port being closed with RST instead of FIN message (reduces number of available TCP buffers).
16Mar2011 4.13
  1. C37.118 sequence phasor tags (strings) swapped. If  "Positive Sequence" is selected then the output is "Zero Sequence". If "Zero Sequence" is selected then the output is "Positive Sequence". If both are selected then the outputs function as expected (reference BZ 656).
09Feb2010 4.12
  1. Add support for C37.118 CFG-2 messages to be sent via the UDP broadcast port.
  2. Updated how the C37.118 auto UDP start-up functions. The broadcast will no longer be enabled all the time (it can be stopped via the C37.118 stop broadcast command).
  3. Relays put into fault state when hardware fault detected.
  4. Requires PSCSV v1.128 or newer
05Oct2009 4.11
  1. DNP Update: Add Class-1 response. Note: Will only respond if a subset of Class-0 data is selected.
08Jul2009 4.10
  1. DNP Update: Add "selectable" Class-0 response.
  2. Update Flash power-up detection to work with new flash memory chip.
09Dec2008 4.05
  1. Updated DNP to correctly respond to unimplemented functions
26Nov2008 4.04
  1. Updated to correctly respond to unsupported Object-30 qualifiers
  2. DSP: Restore DNP frequency scaling to 0.01Hz and to a signed value
19Sep2007 4.02
  1. Add support for new redesigned 32 MB data Flash memory card.
09Aug2007 4.01
  1. Remove TCP selective ACK feature. It behaves erratically when TCP port is closed in the middle of a retry sequence.
  2. Fix scheduled data download problem (lock-up on version 4.00)
30Jul2007 4.00
  1. Add Power Factor and Q analog values to C37.118 message
  2. Add new "Ghost" PMU feature (PMU-3)
  3. Now using BSD TCP keepalive feature.(no more 10min timeout)
  4. Fix C37.118 integer mode analog calculation for total values.
  5. Fix waveform logging: Waveform data is now contiguous from pre-fault to trigger logging (no missing records).
  6. Fix front panel power display when in single element mode.
  7. Update front panel event time to display asterisk when time not set
  8. Requires PSCSV version 1.105 or greater.
21Jun2007 3.98
  1. Fix event input lock-up problem.
  2. DSP: Activated 0.14 degree phase offset correction. The NIST results indicate an offset of - 0.14 degrees and a slight negative slope with frequency.
04Jun2007 3.96

NOTE: The firmware for the "167" boards is no longer included in the firmware releases. The Model 1133A serial number must be 94 or greater to use this firmware.

  1. DSP: Fix missing x.083333 PMU phasor record when using 60 times/second rate.
10May2007 3.95
  1. NOTE: This is the last release for the "167" boards. See "Steps to determine Processor Type:" on the firmware page
  2. Fix potential lock-up problem associated with PSCSV TCP connection time-out.
  3. Enable TCP selective ACK feature
  4. Ethernet driver update (fix re-transmit)
23Apr2007 3.94
  1. Enable TCP selective ACK feature
  2. Ethernet driver update (fix re-transmit)
26Mar2007 3.92
  1. Fix DSP version date (No code change)
21Mar2007 3.91
  1. (DSP) Fix potential dependent trigger mode problem
  2. Fix C37.118 Digital Status words (DIGUNIT) for CFG-1 CFG-2 configuration frames. It had Normal Status and Active Mask values reversed.
  3. Ethernet: Correct potential broadcast/ARP input message parsing problem
20Feb2007 3.90
  1. Ethernet: Fix intermittent transmit problem
  2. Fix IRIG-B 90ms position identifier P1 (was 2ms instead of required 8ms)
  3. Fix relay one pulse per second mode (pulse duration indeterminate in some cases).
  4. Remove support for Trimble GPS receiver.
  5. DNP fixes: TCP and serial related fixes.
  6. Fix current display for values greater than 10,000.0A.

C37.118 Updates:

  1. No longer supports a UDP "connection" mode. The UDP is now only used to broadcast the C37.118 data.
  2. Correct problem of not properly processing multi TCP C37.118 commands contained in one TCP message.
  3. Fix PMU-2 TCP reconnect problem.
  4. Fix problem associated with changes to the PMU Ethernet configuration not "seeming" to take effect unless the unit is re-booted.
  5. Fix C37.118 STAT bit 13 (Sync) bit function
  6. Add autonomous mode to C37.118 UDP broadcast, Unicast and Multicast.
07Sep2006 3.81
  1. Fix trigger log data type retention problem (Waveform, PMU-1 and PMU-2 types reset back to "None" when unit reset).
  2. Add power-up initialization of Trimble GPS navigation configuration.
15Aug2006 3.80


  1. Fix C37.118 problem related to data records incorrectly being time tagged one second ahead of time.
  2. Disable Multicast reception and strip off all broadcast messages, except ARP, before it takes up an Ethernet processing buffer.


  1. Fixed potential lock-up problem associated with backed up C37.118 not being pulled off fast enough by the host.
  2. Fixed Raised-Cosine algorithm and simplified Kaiser window algorithm
  3. Adaptive tuning now works for ± 2, ± 5 and ± 10 Hz.
26Jun2006 3.73
  1. Fix PMU power-up initialization problem.
  2. Fix potential TCP task prority re-assignment problem associated with the TCP ports used for C37.118 (PMU-1 and PMU-2).
  3. Change the PMU default values to something more sensible.
11May2006 3.72
  1. Fix serial port (1 and 2) overflow problem associated when too much data selected for broadcast.
  2. Fix DSP problem associated with using the PMU "Raised Cosine" option. (After power-up, all phasor data would remain 0's until the PMU was re-initialized)
08May2006 3.71

* First release with new C37.118 support and dual PMU capability

  1. Fix PMU-1/PMU-2 event logging (was not storing correct data).
  2. Clear PMU message count word to indicate to DSP that PMU message area is ready for next message.
  3. Use the DSP trigger information to "fill-out" C37.118 trigger info in the STAT word (STAT Bit 11 and Bits 03-00).
08Nov2005 3.61
  1. Replace IEEE-1344 with C37.118 standard. For legacy sake, the ASI 1344 broadcast functionality was kept.
  2. Fix C37.118 Seconds Of Centry (SOC) calculation (C37.118 starts 1970 while it still had 1344's version which starts 1900).
  3. The phasor measurement time-tag assignment was inadvertently left off of PMU-1 and PMU-2 trigger logging record.
  4. Fix intermittent LCD-keyboard "lock-up". Problem had to do with LCD time-out which in turn disables any more updates to the LCD.
05Apr2005 3.52
  1. Enable time range erase for Flash event area.
  2. (DSP) Fix sequence demand logging
15Mar2005 3.51
  1. Add sequence voltage elements to scheduled data logging.
  2. Add Flicker calculation constants selection (50 Hz or 60 Hz).
  3. Add system configuration data storage in external data Flash.
  4. Add Sags and Swells.
  5. Fix event input storage time (was using local time not UTC)

Special notes:

  1. Requires PSCSV version 1.024 or greater.
  2. Download any information from the 1133A memory you want to keep.
  3. Upload the new firmware.
  4. Format the memory using PSCSV.
  5. You are now good to go.
06Jul2004 3.42
  1. Add 10 minute time-out to ethernet connections (close TCP port after 10 minutes of inaction).
  2. Add ethernet status message and message to kill specified TCP port.
  3. Add place holders for the new C37.118 phasor TCP and UDP connections.
  4. Clean-up "auto" variables (make sure to limit size for task use).
  5. Add Vh, V2h, Ah and A2h calculation for logged V-I schedule data for 3-Phase3W2E mode (Peru).
25Mar2004 3.31
  1. Fix problem with scheduled K-factor calculation (DSP processor)
22Mar2004 3.32
  1. Fix channel-B scaling in 2 element mode (DSP processor)
08Mar2004 3.31
  1. Updated the version status screen to only show one version number.
  2. Fix CT/PT scaling problem caused when switching over to common structures/directories.
11Feb2004 3.30
  1. Updated to use new "shared" directories (host-dsp-pscsv).
  2. Fix Seconds-Of-Century calculation in "time.c". Was incorrectly adding in leap years one year AHEAD of time.

Please update to a newer version.

29Oct2003 3.10
  1. Add zero, positive and negative sequence readings to the IEEE-1344 phasor message.
  2. DSP trigger word (32-bit) was also added to the phasor message
26Sep2003 3.10
  1. Update the IEEE-1344 configuration frame to include the CT and PT nominal ratios.
  2. Add Vorne's display capability for both serial ports (configurable).
  3. Update ethernet code to try to detect and recover from a locked interrupt.
  4. Separate checks of the DSP configuration elements so that one element will not initialize the others.
07Aug2003 3.02
  1. Updated the Energy front panel display to use Register data values instead of demand data.
04Aug03 3.01
  1. Loader is now linked in with host firmware and no longer loaded via the PC.

What is Accuracy?
Download 1133a_what_is_accuracy.pdf (46 kB) »

Applications Of Synchronised Power Quality Measurements
Download PD0052000_Applications_Of_Synchronised_Power_Quality_Measurements.pdf (485 kB) »

Aplicaciones de calidad deenergía sincronizada
Download PD0052001_Applications_Of_Synchronised_Power_Quality_Measurements_espanol.pdf (5 MB) »

Accurate CT Calibration for the Model 1133A
Download 1133a_accurate_ct_calibration.pdf (44 kB) »

Convention for Energy and Sequence Components
Download 1133a_conv_energy_seq_comp.pdf (38 kB) »

Direction of Harmonics and Flicker
Download 1133a_direction_harmonic_flicker.pdf (27 kB) »

Model 1133A Definitions of Energy Flow
Download 1133a_defn_energy_flow.pdf (33 kB) »

Model 1133A: Extended Calibration Interval
Download 1133a_ext_cal_interval.pdf (28 kB) »

Model 1133A Phasor Measurement Specifications
Download 1133_phasor_measurement_specifications.pdf (2 MB) »

Model 1133A Power Sentinel™ Functional Description, Español
Download 1133a_functional_description_espanol.pdf (97 kB) »

Model 1133A Power Sentinel™ Functional Description
Download 1133a_functional_description.pdf (69 kB) »

Synchronizing End-to-End Relay Testing with the Model 1088B Satellite-Controlled Clock
Download application_note_102.pdf (18 kB) »

Triggering in the Model 1133A Power Sentinel™ DSP
Download 1133a_dsp_triggering.pdf (39 kB) »

What is Absolute Phase Angle?
Download absolute_phase.pdf (26 kB) »

AEP-IEC 687 Certification Tests for Model 1133A
Download 1133a_aep_iec687.pdf (2 MB) »

Comparative Testing of Synchronized Phasor Measurement Units
Download VirginiaTech_PESGM2004-001296.pdf (112 kB) »

Press Release: Leap Second Anomaly December 2016
Download PD0054900_LeapSecondPressRelease.pdf (70 kB) »

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