Cautions, Warnings, and Regulatory Information: Digital/Analog Amplifiers Installation Instructions
Cautions, Warnings, and Regulatory Information: Digital/Analog Amplifiers Installation Instructions
              ELECTRICAL HAZARD Disconnect electrical field power when making any internal adjustments or repairs. All repairs should be
              performed by a representative or an authorized agent of your local Simplex product supplier.
FCC RULES AND REGULATIONS – PART 15. This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment
is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
SYSTEM REACCEPTANCE TEST AFTER SOFTWARE CHANGES To ensure proper system operation, this product must be tested in accordance with
NFPA72® after any programming operation or change in site-specific software. Reacceptance testing is required after any change, addition or deletion
of system components, or after any modification, repair or adjustment to system hardware or wiring.
All components, circuits, system operations, or software functions known to be affected by a change must be 100% tested. In addition, to ensure that
other operations are not inadvertently affected, at least 10% of initiating devices that are not directly affected by the change, up to a maximum of 50
devices, must also be tested and proper system operation verified.
NFPA 72® is a registered trademark of the National Fire Protection Association.
Introduction to Amplifiers
Introduction
This publication describes the installation procedure for the 4100U and 4100ES Fire Alarm Control Units (FACU) family of digital and analog amplifiers.
Important: Verify FACU System Programmer, Executive, and Slave Software compatibility when installing, or replacing system components. Refer to
the Technical Support Information and Downloads website for compatibility information.
Overview
The digital and analog audio amplifiers provide analog audio power to the system speaker circuits. Digital amplifiers decode digitally encoded input
signals and analog amplifiers receive analog input signals. A speaker circuit consists of one or more speakers that are driven by the same physical
wiring. All of the 100 W amplifiers described in this document are single channel amplifiers; that is, each speaker circuit is driven by the same audio
signal. See 100 W Amplifiers Compatible with CSNAC Option for a list of all 100 W amplifiers.
579-174 Rev P
                                                                                                                                *0579174P*
                                                                                 Digital/Analog Amplifiers Installation Instructions
Analog Amps:
    • 4100-1314 100 W Amp – 120 VAC, 25 VRMS
    • 4100-1315 100 W Amp – 120 VAC, 70 VRMS
    • 4100-1316 100 W Amp – 120 VAC, 25 VRMS – Canada
    • 4100-1317 100 W Amp – 120 VAC, 70 VRMS – Canada
    • 4100-1318 100 W Amp – 220/230/240 VAC, 25 VRMS
    • 4100-1319 100 W Amp – 220/230/240 VAC, 70 VRMS
    • 4100-1320 Backup 100 W Amp – 120 VAC, 25 VRMS
    • 4100-1321 Backup 100 W Amp – 120 VAC, 70 VRMS
    • 4100-1322 Backup 100 W Amp – 120 VAC, 25 VRMS – Canada
    • 4100-1323 Backup 100 W Amp – 120 VAC, 70 VRMS – Canada
    • 4100-1324 Backup 100 W Amp – 220/230/240 VAC, 25 VRMS
    • 4100-1325 Backup 100 W Amp – 220/230/240 VAC, 70 VRMS
Digital Amps:
    • 4100-1328 100 W Amp – 120 VAC, 25 VRMS
    • 4100-1329 100 W Amp – 120 VAC, 70 VRMS
    • 4100-1330 100 W Amp – 120 VAC, 25 VRMS – Canada
    • 4100-1331 100 W Amp – 120 VAC, 70 VRMS – Canada
    •    4100-1332 100 W Amp – 220/230/240 VAC, 25 VRMS
    •    4100-1333 100 W Amp – 220/230/240 VAC, 70 VRMS
    •    4100-1334 Backup 100 W Amp – 120 VAC, 25 VRMS
    •    4100-1335 Backup 100 W Amp – 120 VAC, 70 VRMS
    •    4100-1336 Backup 100 W Amp – 120 VAC, 25 VRMS – Canada
    •    4100-1337 Backup 100 W Amp – 120 VAC, 70 VRMS – Canada
    •    4100-1338 Backup 100 W Amp – 220/230/240 VAC, 25 VRMS
    •    4100-1339 Backup 100 W Amp – 220/230/240 VAC, 70 VRMS
               EXPANSION
               NAC PORT 1                                                                           EXPANSION
                     (P1)                                                                           NAC PORT 2
                                                                                                    (P3)
                                                                                                   NAC TROUBLE
                                                                                                   LEDS (LEDs 5
                                                                                                   through 10)
               OUTPUT
           TROUBLE LED
                 (LED2)
                                                                                                    DIGITAL
                                                                                                    AUDIO
           BAUD RATE/
                                                                                                    DECODER
          ADDRESS DIP
                                                                                                    PORT (P2)
          SWITCH (SW1)
                                                                                                   AC POWER
              COMMS                                                                                LED (LED4)
          TROUBLE LED
                (LED1)
                                                                                                   BACKUP
                                                                                                   AUDIO
                                                                                                   TERMINAL
                                                                                                   BLOCK (TB2)
         INPUT TROUBLE
             LED (LED3)
Amplifier Specifications
Digital and Analog Amplifiers
The specifications below apply to both analog and digital amplifiers.
Note:
   • You must set these switches to the value assigned to the card by the programmer.
    •    The SW1 setting applies to audio controller slaves, including audio input cards.
ON
OFF
1 2 3 4 5 6 7 8
   Address   SW 1-2   SW 1-3   SW 1-4   SW 1-5   SW 1-6   SW 1-7    SW 1-8      Address     SW 1-2   SW 1-3   SW 1-4   SW 1-5   SW 1-6   SW 1-7   SW 1-8
      1       ON       ON       ON       ON       ON       ON        OFF          61         ON       OFF      OFF      OFF      OFF      ON       OFF
      2       ON       ON       ON       ON       ON       OFF       ON           62         ON       OFF      OFF      OFF      OFF      OFF      ON
      3       ON       ON       ON       ON       ON       OFF       OFF          63         ON       OFF      OFF      OFF      OFF      OFF      OFF
      4       ON       ON       ON       ON       OFF      ON        ON           64         OFF      ON       ON       ON       ON       ON       ON
      5       ON       ON       ON       ON       OFF      ON        OFF          65         OFF      ON       ON       ON       ON       ON       OFF
      6       ON       ON       ON       ON       OFF      OFF       ON           66         OFF      ON       ON       ON       ON       OFF      ON
      7       ON       ON       ON       ON       OFF      OFF       OFF          67         OFF      ON       ON       ON       ON       OFF      OFF
      8       ON       ON       ON       OFF      ON       ON        ON           68         OFF      ON       ON       ON       OFF      ON       ON
      9       ON       ON       ON       OFF      ON       ON        OFF          69         OFF      ON       ON       ON       OFF      ON       OFF
     10       ON       ON       ON       OFF      ON       OFF       ON           70         OFF      ON       ON       ON       OFF      OFF      ON
     11       ON       ON       ON       OFF      ON       OFF       OFF          71         OFF      ON       ON       ON       OFF      OFF      OFF
     12       ON       ON       ON       OFF      OFF      ON        ON           72         OFF      ON       ON       OFF      ON       ON       ON
     13       ON       ON       ON       OFF      OFF      ON        OFF          73         OFF      ON       ON       OFF      ON       ON       OFF
     14       ON       ON       ON       OFF      OFF      OFF       ON           74         OFF      ON       ON       OFF      ON       OFF      ON
     15       ON       ON       ON       OFF      OFF      OFF       OFF          75         OFF      ON       ON       OFF      ON       OFF      OFF
     16       ON       ON       OFF      ON       ON       ON        ON           76         OFF      ON       ON       OFF      OFF      ON       ON
     17       ON       ON       OFF      ON       ON       ON        OFF          77         OFF      ON       ON       OFF      OFF      ON       OFF
     18       ON       ON       OFF      ON       ON       OFF       ON           78         OFF      ON       ON       OFF      OFF      OFF      ON
     19       ON       ON       OFF      ON       ON       OFF       OFF          79         OFF      ON       ON       OFF      OFF      OFF      OFF
     20       ON       ON       OFF      ON       OFF      ON        ON           80         OFF      ON       OFF      ON       ON       ON       ON
     21       ON       ON       OFF      ON       OFF      ON        OFF          81         OFF      ON       OFF      ON       ON       ON       OFF
     22       ON       ON       OFF      ON       OFF      OFF       ON           82         OFF      ON       OFF      ON       ON       OFF      ON
     23       ON       ON       OFF      ON       OFF      OFF       OFF          83         OFF      ON       OFF      ON       ON       OFF      OFF
     24       ON       ON       OFF      OFF      ON       ON        ON           84         OFF      ON       OFF      ON       OFF      ON       ON
     25       ON       ON       OFF      OFF      ON       ON        OFF          85         OFF      ON       OFF      ON       OFF      ON       OFF
     26       ON       ON       OFF      OFF      ON       OFF       ON           86         OFF      ON       OFF      ON       OFF      OFF      ON
     27       ON       ON       OFF      OFF      ON       OFF       OFF          87         OFF      ON       OFF      ON       OFF      OFF      OFF
     28       ON       ON       OFF      OFF      OFF      ON        ON           88         OFF      ON       OFF      OFF      ON       ON       ON
     29       ON       ON       OFF      OFF      OFF      ON        OFF          89         OFF      ON       OFF      OFF      ON       ON       OFF
     30       ON       ON       OFF      OFF      OFF      OFF       ON           90         OFF      ON       OFF      OFF      ON       OFF      ON
     31       ON       ON       OFF      OFF      OFF      OFF       OFF          91         OFF      ON       OFF      OFF      ON       OFF      OFF
     32       ON       OFF      ON       ON       ON       ON        ON           92         OFF      ON       OFF      OFF      OFF      ON       ON
     33       ON       OFF      ON       ON       ON       ON        OFF          93         OFF      ON       OFF      OFF      OFF      ON       OFF
     34       ON       OFF      ON       ON       ON       OFF       ON           94         OFF      ON       OFF      OFF      OFF      OFF      ON
     35       ON       OFF      ON       ON       ON       OFF       OFF          95         OFF      ON       OFF      OFF      OFF      OFF      OFF
     36       ON       OFF      ON       ON       OFF      ON        ON            96        OFF      OFF      ON       ON       ON       ON       ON
     37       ON       OFF      ON       ON       OFF      ON        OFF           97        OFF      OFF      ON       ON       ON       ON       OFF
     38       ON       OFF      ON       ON       OFF      OFF       ON            98        OFF      OFF      ON       ON       ON       OFF      ON
     39       ON       OFF      ON       ON       OFF      OFF       OFF           99        OFF      OFF      ON       ON       ON       OFF      OFF
     40       ON       OFF      ON       OFF      ON       ON        ON           100        OFF      OFF      ON       ON       OFF      ON       ON
     41       ON       OFF      ON       OFF      ON       ON        OFF          101        OFF      OFF      ON       ON       OFF      ON       OFF
     42       ON       OFF      ON       OFF      ON       OFF       ON           102        OFF      OFF      ON       ON       OFF      OFF      ON
     43       ON       OFF      ON       OFF      ON       OFF       OFF          103        OFF      OFF      ON       ON       OFF      OFF      OFF
     44       ON       OFF      ON       OFF      OFF      ON        ON           104        OFF      OFF      ON       OFF      ON       ON       ON
     45       ON       OFF      ON       OFF      OFF      ON        OFF          105        OFF      OFF      ON       OFF      ON       ON       OFF
     46       ON       OFF      ON       OFF      OFF      OFF       ON           106        OFF      OFF      ON       OFF      ON       OFF      ON
     47       ON       OFF      ON       OFF      OFF      OFF       OFF          107        OFF      OFF      ON       OFF      ON       OFF      OFF
     48       ON       OFF      OFF      ON       ON       ON        ON           108        OFF      OFF      ON       OFF      OFF      ON       ON
     49       ON       OFF      OFF      ON       ON       ON        OFF          109        OFF      OFF      ON       OFF      OFF      ON       OFF
     50       ON       OFF      OFF      ON       ON       OFF       ON           110        OFF      OFF      ON       OFF      OFF      OFF      ON
     51       ON       OFF      OFF      ON       ON       OFF       OFF          111        OFF      OFF      ON       OFF      OFF      OFF      OFF
     52       ON       OFF      OFF      ON       OFF      ON        ON           112        OFF      OFF      OFF      ON       ON       ON       ON
     53       ON       OFF      OFF      ON       OFF      ON        OFF          113        OFF      OFF      OFF      ON       ON       ON       OFF
     54       ON       OFF      OFF      ON       OFF      OFF       ON           114        OFF      OFF      OFF      ON       ON       OFF      ON
     55       ON       OFF      OFF      ON       OFF      OFF       OFF          115        OFF      OFF      OFF      ON       ON       OFF      OFF
     56       ON       OFF      OFF      OFF      ON       ON        ON           116        OFF      OFF      OFF      ON       OFF      ON       ON
     57       ON       OFF      OFF      OFF      ON       ON        OFF          117        OFF      OFF      OFF      ON       OFF      ON       OFF
     58       ON       OFF      OFF      OFF      ON       OFF       ON           118        OFF      OFF      OFF      ON       OFF      OFF      ON
     59       ON       OFF      OFF      OFF      ON       OFF       OFF          119        OFF      OFF      OFF      ON       OFF      OFF      OFF
     60       ON       OFF      OFF      OFF      OFF      ON        ON
                                                                                                            FERRITE
                                                                                                            BEAD          120V
                                                                                                                          NEUTRAL
                                                                                                 120VAC
                                                                                                 60 Hz, 4A                GROUND
                                                                                       120V TO                              PDM
                                                                                       TRANSFORMER                          See
                                                                                       THROUGH                              Note 4
                                                                                       BULKHEAD
                                                                                       CONNECTOR
                                                                                                                 HARNESS
                                                                                                                 TO24V BATTERY
                                    See Note 1                                                                   See Note 3
                                                                BATTERY HARNESS
                                                                                          220/230/240 VAC
                                                                FUSED AT 15A              PDM TERMINAL
                                                                                          BLOCK
                                                                                          See Note 5
Note:
   1.     Second bulkhead connector here in 220/230/240 VAC versions.
    2.    The harness is 734-012 or 734-013.
    3.    The harness is 733-015.
    4.    566-246 or 566-248 (see note 5).
    5.    The terminal block shown is 566-248.
Note: Applied power is the total amplifier power available to the speaker circuit. Applied power is consumed by speakers and wiring losses. Actual
power is the speaker power available over the maximum distances designated for each wire size. Complying with the wire sizes and associated dis-
tances specified will ensure no more than a 3 dB wiring power loss to the end of the speaker circuit.
                                           Table 2: Class A Speaker Circuit Wiring Distances for 100W Amplifiers*
            Power (Watts)              Distance to the Last Speaker (One Way) (Feet/Meters)
VRMS                                                        2                                2                              2                                2
            Applied       Actual       12 AWG (3.309 mm )               14 AWG (2.081 mm )            16 AWG (1.309 mm )           18 AWG (0.8231 mm )
25          50            25           812 ft. (247 m)                  510 ft. (155 m)               340 ft. (104 m)              200 ft. (61 m)
25          40            20           1,015 ft. (309 m)                640 ft. (195 m)               402 ft. (123 m)              252 ft. (77 m)
25          30            15           1,350 ft. (411 m)                850 ft. (259 m)               535 ft. (163 m)              337 ft. (103 m)
25          20            10           2,035 ft. (620 m)                1,250 ft. (381 m)             804 ft. (245 m)              505 ft. (154 m)
25          10            5            4,070 ft. (1,241 m)              2,600 ft. (792 m)             1,600 ft. (488 m)            1,012 ft. (308 m)
70          100           50           3,250 ft. (991 m)                2,049 ft. (625 m)             1,288 ft. (393 m)            810 ft. (247 m)
70          80            40           4,060 ft. (1,237 m)              2,554 ft. (778 m)             1,600 ft. (488 m)            1,010 ft. (308 m)
70          70            35           4,959 ft. (1,511 m)              2,930 ft. (893 m)             1,820 ft. (555 m)            1,158 ft. (353 m)
70          60            30           5,430 ft. (1,655 m)              3,400 ft. (1,036 m)           2,138 ft. (652 m)            1,350 ft. (411 m)
70          50            25           6,500 ft. (1,981 m)              4,096 ft. (1,248 m)           2,578 ft. (786 m)            1,620 ft. (494 m)
70          40            20           8,121 ft. (2,475 m)              5,108 ft. (1,557 m)           3,212 ft. (979 m)            2,020 ft. (616 m)
70          30            15           10,860 ft. (3,310 m)             6,800 ft. (2,073 m)           4,270 ft. (1,301 m)          2,689 ft. (820 m)
70          20            10           16,212 ft. (4,941 m)             10,190 ft. (3,106 m)          6,400 ft. (1,951 m)          4,030 ft. (1,228 m)
70          10            5            32,400 ft. (9,876 m)             20,000 ft. (6,096 m)          12,500 ft. (3,810 m)         8,000 ft. (2,438 m)
                                           Table 3: Class B Speaker Circuit Wiring Distances for 100W Amplifiers*
            Power (Watts)              Distance to the Last Speaker (One Way) (Feet/Meters)
VRMS                                                        2                                2                             2                                 2
            Applied       Actual       12 AWG (3.309 mm )               14 AWG (2.081 mm )            16 AWG (1.309 mm )           18 AWG (0.8231 mm )
25          50            25           1,624 ft. (495 m)                1,021 ft. (311 m)             680 ft. (207 m)              400 ft. (122 m)
25          40            20           2,033 ft. (620 m)                1,279 ft. (390 m)             804 ft. (245 m)              505 ft. (154 m)
25          30            15           2,707 ft. (825 m)                1,704 ft. (519 m)             1,070 ft. (326 m)            673 ft. (205 m)
25          20            10           4,067 ft. (1,240 m)              2,558 ft. (780 m)             1,608 ft. (490 m)            1,011 ft. (308 m)
25          10            5            8,140 ft. (2,481 m)              5,120 ft. (1,561 m)           3,219 ft. (981 m)            2,024 ft. (617 m)
70          100           50           6,500 ft. (1,981 m)              4,098 ft. (1,249 m)           2,577 ft. (785 m)            1,620 ft. (494 m)
70          80            40           8,121 ft. (2,475 m)              5,108 ft. (1,557 m)           3,212 ft. (979 m)            2,020 ft. (616 m)
70          70            35           9,918 ft. (3,023 m)              5,860 ft. (1,786 m)           3,685 ft. (1,123 m)          2,317 ft. (706 m)
70          60            30           10,860 ft. (3,310 m)             6,800 ft. (2,073 m)           4,276 ft. (1,303 m)          2,700 ft. (823 m)
70          50            25           13,000 ft. (3,962 m)             8,197 ft. (2,498 m)           5,154 ft. (1,571 m)          3,241 ft. (988 m)
70          40            20           16,243 ft. (4,951 m)             10,216 ft. (3,114 m)          6,424 ft. (1,958 m)          4,040 ft. (1,231 m)
70          30            15           21,721 ft. (6,621 m)             13,602 ft. (4,146 m)          8,553 ft. (2,607 m)          5,379 ft. (1,640 m)
70          20            10           32,424 ft. (9,883 m)             20,394 ft. (6,216 m)          12,823 ft. (3,908 m)         8,065 ft. (2,458 m)
70          10            5            64,800 ft. (19,751 m)            40,000 ft. (12,192 m)         25,000 ft. (7,620 m)         16,000 ft. (4,877 m)
* Wiring distances affected by capacitance of speaker circuit wiring if using CSNAC. See notes in Figure 9.
Class B Wiring
Note:
See Note
Note: For guidance regarding proper wiring practice when using the TrueAlert ES speaker appliances, see the Speaker Wiring Application Guidelines in
the EPS Installation Instructions, 579-1015.
     • Leave the 10 K,1/2 W resistors (378-030; brown/black/orange) on the B+ to B- terminals of unused circuits.
                                                    2                        2
    •    All wiring is between 18 AWG (0.8231 mm ) and 12 AWG (3.309 mm ) twisted pair.
    •    All field wiring and backup audio wiring is power-limited.
    •    Backup audio wiring is unsupervised.
Class A Wiring
                   TO ADDITIONAL
                  AMPLIFIERS FOR
                   ONE-FOR-MANY
                  CONFIGURATION
See Note
Note:
   1.         4081-9008
    2.        4081-9018
    3.        4100-1259
    4.        4100-1260
Note:
   • Leave the 10 K resistors on the B+ and B- terminals of unused circuits.
    •     Remove the 10 K resistors from the B+ and B- terminals on the card that hosts the CSNAC (amplifiers and XSIG cards).
                                                     2                                  2
    •     All wiring is between 18 AWG (0.8231 mm ) (minimum) to 12 AWG (3.309 mm ) (maximum) twisted pair.
    •     Field wiring is power-limited.
    •     The maximum speaker circuit current is 2 A per circuit.
    •     The total available alarm power is 100 W (4 A @ 25 VRMS, 1.414 A @ 70.7 VRMS) or as limited by the connected amplifier.
    •     Shielded wiring is not recommended.
          - Indoor shielding (25 V only): Connect to shield terminal on the CSNAC. Terminate at source only.
          -    Outdoor shielding (25 V only): Use 2081-9044 and terminate to Earth according to those installation instructions. Do not connect the shield
               to the CSNAC.
          -    For 70.7 V and other shielding options, consult your sales support channel.
    •     Signal wiring must test free of grounds.
    •     70 V CSNAC circuits require unshielded twisted pair (UTP) cable.
    •     The maximum combined capacitance of all CSNAC speaker circuit wiring to each amplifier:
          - 100W 25 V: 1.3 uF
          -    100W 70 V: 0.15 uF
    •     Consult your sales support channel if installing a 70 V CSNAC system with more than 6000 ft of total wire to any single amplifier. Additional
          equipment may be needed.
    •     For guidance regarding proper wiring practice when using TrueAlert ES speaker appliances, refer to the Speaker Wiring Application Guidelines
          in the EPS Installation Instructions, 579-1015.
    •     For installations outside of these guidelines, consult your sales support channel.
LED Indications
LEDs
The amplifier LEDs are summarized in the Table 4.
                                                                Table 4: LED Indications
LED #           LED Name                Meaning                                                                                        Color
LED1            COMMS TBL               Steadily on when the amplifier is not communicating with the system CPU                        Yellow
LED2            OUT_TBL                 Steadily on during Power Stage Overcurrent Failure/Output Supervision Trouble                  Yellow
                                        Single blink: input channel 1 failure
                                        Double blink: input channel 2 failure
LED3            IN_TBL                                                                                                                 Yellow
                                        Steadily on: failure on input channels 1 and 2
                                        Applies to analog input channel or digital audio riser.
LED4            AC Pwr                  Steadily on when AC supply is on                                                               Green
LED5            NAC 1 Status            Steadily on when NAC 1 is on or in Trouble condition                                           Yellow
LED6            NAC 2 Status            Steadily on when NAC 2 is on or in Trouble condition                                           Yellow
LED7            NAC 3 Status            Steadily on when NAC 3 is on or in Trouble condition                                           Yellow
LED8            NAC 4 Status            Steadily on when NAC 4 is on or in Trouble condition                                           Yellow
LED9            NAC 6 Status            Steadily on when NAC 5 is on or in Trouble condition                                           Yellow
LED10           NAC 5 Status            Steadily on when NAC 6 is on or in Trouble condition                                           Yellow
Non-Alarm Audio
How to Properly Set Up a System for Non-alarm Audio
There are some conditions under which non-alarm audio (NAA) (music, paging announcements) may not be broadcast at the full amplifier capacity of
100 watts. To do so may cause the amplifier to cut out with an over-current fault. This is not a potential problem in alarm-only non-alarm audio.
30% of the capacity of an amplifier is reserved for the 20 kHz supervision tone which is broadcast along with the desired non-alarm audio. Amplifiers
with a speaker load of 70% or less of the amplifier capacity (70 watts) may broadcast NAA at full volume.
Amplifiers with a speaker load of more than 70% of amp capacity must operate at a reduced NAA level by reducing the input voltage level so that the
power stage current draw does not exceed 100% of the amp capacity. That level is:
     • 25 V Amp: 4.0 A
     • 70 V Amp: 1.43 A
Current should be monitored by broadcasting NAA and observing the real time current reading in the appropriate section of the card status for the
applicable amplifier. Adjust the input level (external music source, microphone adjustment, etc.) for the proper peak current.
Note: The peak current reading in the amplifier card status page should not be used because it is affected by inrush on power-up and is never reset.
The reading may be higher than the NAA peak.
579-174 Rev P