Wohler ALARM-24 Series User Manual download pdf (Page 10)

ALM26 Series User Manual P/N 821644 Rev-A

Please refer to the example in Figure-2a on the following page to familiarize yourself with the front panel features of the ALM26

Series units covered by this manual. The following sections describe these functions and are referenced, by number, to Figure-2a.

Section 2: Operation

Front Panel Features

Alarm Sounder

This piezo Alarm Sounder speaker produces an audible alarm when any channel detects any alarm condition. See page 9 for

instructions for how to disable or enable the Alarm Sounder.

Bargraph Brightness Trim Pot

This control is recessed into the front panel and can be accessed using a small screwdriver. Turning it clockwise will increase

the relative brightness of the bargraph display LED segments. Adjusting this one control will simultaneously affect the

brightness of all bargraph displays on the front panel.

Audio Level Meter LED Bargraph Displays (1-24)

Audio levels for the audio input sources are displayed via these 26-segment tri-color (green, amber, red) LED Bargraph

Display level meters.

Each LED Bargraph Display represents a single channel.

Each Reset Button (Item 4), located above the LED bargraphs, has a

channel number, which corresponds to the numbers found next to the input connectors on the rear panel. Bargraph displays are

arranged in groups of four on the front panel, four being the number of input channels available in each input section on the rear

panel.

ALM26-nnD (Digital): Each group of four bargraph displays is user adjustable for Reference Level calibration and PPM/VU

Display Mode via a DIP switch module on the rear panel. This DIP switch module is located between the two input connectors in

each input section on the rear panel. See Item B, page 12 for more information regarding the rear panel DIP switch locations and

settings.

ALM26-nnA (Analog): Each group of four bargraph displays is user adjustable for Reference Level calibration and PPM/VU

Display Mode via a DIP switch module on the rear panel. This DIP switch module is located between the two input connectors in

each input section on the rear panel. See Item D, page 14 for more information regarding the rear panel DIP switch locations and

settings.

Alarm Indication Behavior

Alarm conditions are indicated by lit LEDs in the 26-segment LED bargraph displays as follows:

• Clipping Alarm is indicated in the Top one third region of the bargraph LED segments.

• Phase Alarm is indicated in the Middle one third region of the bargraph LED segments.

• Loss of Audio is indicated in the Bottom one third region of the bargraph LED segments.

• Carrier Loss in a digital unit is indicated by all three regions of LED segments in the left channel, and the top and

bottom regions in the right channel turning RED. The center region on the right side is left dark. This creates a

flashing red “C” between the two channels.

In an alarm condition, the applicable bargraph LED segments (see above) will alternately flash between RED and the color

previously displayed in the individual LED segments. To reset the alarm behavior for each individual LED bargraph,

press the Reset Button directly above the bargraph (Item 4). To simultaneously reset the alarm behavior of ALL the

bargraphs in the unit, press the Reset All Button (Item 6). See Alarm Resets in Section 7.0 in the Wohler Alarm Controller

(WAC ) manual (P/N 821642) for details on reset function modes available through the WAC software. Note that these buttons

also reset the peak-hold segment when manual peak hold mode is enabled (see page 20).

NOTE: Each of the alarm features described above may be enabled or disabled on a per channel basis or on a unit wide

basis through the WAC (Wohler Alarm Control) software. See Setting Alarm Channel Parameters, Section 5.5 and

System Settings, Section 5.6 in the WAC manual (P/N 821642) for details.

Reset Button (1-24)

These momentary push-buttons reset the level meter alarm function for each individual channel. When a button is pushed, only

the level meter located directly below it is reset.

Power Indication LED

This LED lights up GREEN to indicate the ALM26 Series model is connected to operational mains power.

Reset All Button

This momentary push-button simultaneously resets the level meter alarm function for ALL the channels in the unit. Note that

this button will also reset the peak-hold segment of all the meters with manual peak hold mode enabled (see page 20).

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Wohler ALARM-24 Series User Manual Page 10

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