N1913A and N1914A EPM Series Power Meters Firmware Revision History
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Release A.01.20 (30 April 2021)
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- Support U2050/60 X-Series power sensors in average mode for free-run average power measurements and aperture time setting.

Release A.01.19 (29 May 2020)
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- Resolved the battery charger fault where false alert message is shown.

Release A.01.18 (6 Nov 2019)
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- Change flash chip checking method to manufacturing ID instead of capacity identification

Release A.01.17 (29 Oct 2018)
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- Bug fix calibration offset observed in Channel B for D-Type Sensors

Release A.01.15 (15 Feb 2017)
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- Keysight rebranding 
- Bug fix on *OPT? and SERV:OPT?.
- Bug fix for query unterminated error occurring on connection of U2044XA and U2042XA.
- Bug fix for meter entering RMT mode upon HP848x sensor connection; when the Command Set is in HP437B mode.

Release A.01.12 (15 Dec 2015)
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- Meter will stay in LCL mode when SYSTem:LOCal command is sent via LAN/GPIB.
- Support U2040 X-Series power sensors in average mode for free-run average power measurements and aperture durating setting.

Release A.01.11 (11 Aug 2015)
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- Allow user to set the step detection to off upon system preset in 438A emulation mode (option 200).
- Meter will stay in LCL mode when the programming language is changed via front panel. The meter stays in LCL mode when it is is powered up in 43x mode (option 200).

Release A.01.10 (March 2015)
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- Bug fix for compatibility issue with U848xA USB Thermocouple sensor.
- Fix connection issue of U848x USB sensor with N191x power meter after sending *rst command.

Release A.01.09 (10 September 2013)
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- Resolved the issue of N191xA occasionally does not reply to the TCP socket connection requests from the customer's controller.
- Enable TCP keep alive value configuration through web browser
- Support USB-LAN adaptor for USB sensor connection
- Resolved the issue of meter unable to accept new connection after many LAN restart
- Resolved the issue of E9300H/ 1H having high offset after 1mW ref cal.

Release A.01.08 (20 March 2013)
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- Provide compatibility with U848xA series USB Thermocouple Sensor firmware A.01.01 only
- Resolved DISP:ENAB 0 bug
- Resolved erroneous error message displayed when self test with the 8481D/8485D/8487D 
- Resolved minor display issues in Save/Recall menu

Release A.01.07 (22 Feb 2013)
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- Fixed timeout error for SERV:OPT? command
- Allow user to set frequency to 0Hz
- Bug fix on FETCH:DIFF? command
- Bug fix on 436/ 7/ 8 emulation codes
- Fixed CW self-test issue

Release A.01.06 (02 Jan 2012)
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- 200ft cable supportability
- Bug fix on *DDT? command returning unknown content on visa socket connection
- Inclusion of SERV:OPT? command 
- Bug fix on unwanted frequency change when working with U2000 sensors.
- Bug fix on SYST:LANG SCPI command 
- Bug fix on synchronization of Cal Factor value on GUI during remote operation.

Release A.01.05 (30 Sept 2011)
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- Bug fixes on compatibility with USB sensors
- Bug fix on 436/7/8 emulation codes (option 200)
- Message queue size increased

Release A1.01.04 (30-May-2011)
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Display measurement data on power meter once the USB power sensor is connected at power ON.

Release A.01.03 (23 August 2010)
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- Enable N848x (CFT option) for 436/7/8 emulation codes (option 200) 
- Enable accepting commands with/without newline for 436/7/8 emulation codes (option 200)
- Bug fix on 436/7/8 emulation codes (option 200)

Release A.01.02 (10 March 2010)
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-Upgrade communication board flash codes

Release A.01.01 (1-Jan-2010)
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- Enabled recorder output auto-scaling feature
- Bugs fix on 436/7/8 emulation codes (option 200)

Release A.01.00 (9-June-2009)
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Initial release.