ACCURATE ELECTRONICS 104001C Руководство - Страница 7

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ACCURATE ELECTRONICS INC

WWW.ACCURATE.ORG

PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008

Note: If the TMS does not provide an impedance setting that matches

impedance selected on the module, re-option the module as necessary for a

proper impedance match during this procedure. Then, when this procedure

is completed, reset the module's impedance as required.

Send test tone at 1004Hz and 2804Hz at the CLR-specified transmit

input level toward the distant facility-side end. Have personnel at

that end measure the received levels, subtract the 2804Hz level from

1004Hz level, and report the result.

Set to IN the proper combination of XMT EQL DIP switches that

approximates as closely as possible the reported difference, i.e., the

amount of equalized gain required, as specified in Table 4.

TABLE 4. Equalized Gain Settings from Cable Loss Data.

1004 Hz – 2804 Hz

Difference

0.0 to 0.2 dB

0.3 to 0.7 dB

0.8 to 1.2 dB

1.3 to 1.7 dB

1.8 to 2.2 dB

2.3 to 2.7 dB

2.8 to 3.2 dB

3.3 to 3.7 dB

3.8 to 4.2 dB

4.3 to 4.7 dB

4.8 to 5.2 dB

5.3 to 5.7 dB

5.8 to 6.2 dB

6.3 to 6.7 dB

6.8 to 7.2 dB

7.3 to 7.7 dB

4. CIRCUIT DESCRIPTION

4.01 This circuit description is intended to familiarize you with the 104001C

Prescription Line Amplifier for engineering and application purposes only.

Attempts to troubleshoot the unit internally are not recommended and may

void your warranty. Troubleshooting procedures should be limited to those

prescribed in Section 7 of this practice. Refer to the 104001C block diagram,

Figure 1. of this practice, as an aid in following this circuit description.

Note: The transmit and receive channels of the 104001C module are virtually

identical. Therefore, the description in paragraphs 4.02 and 4.03 applies to

both channels.

4.02 A transformer is used at each port (input and output) of each channel to

interface external circuits. Switch-selectable taps on the external-circuit side

of each transformer afford a choice of 1200, 600, or 150-ohm balance

terminating impedance on both sides (facility and terminal) of the module.

The internal-circuit side of each transformer is protected by a silicon voltage-

transient suppressor that limits transient voltages to a safe level and provides

surge protection. In addition, both transformers are center-tapped to derive

balanced simplex leads.

4.03 Signals entering each channel's input port are coupled across the input

transformer and applied to the LEVEL ADJUST circuit and GAIN AMP.

The level adjust circuit is controlled by the channel's front-panel

This document contains proprietary information and is supplied for identification, maintenance, engineering evaluation or inspection purposes only and shall not be duplicated or disclosed without written

permission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.

Amount of Equalized Gain Required

0.0 dB

0.5 dB

1.0 dB

1.5 dB

2.0 dB

2.5 dB

3.0 dB

3.5 dB

4.0 dB

4.5 dB

5.0 dB

5.5 dB

6.0 dB

6.5 dB

7.0 dB

7.7 dB

Practice Section 104001C Rev B

BEAVERTON OR USA 503.641.0118

GAIN/LOSS and LEVEL switches. These switches allow selection of 0 to

24dB of gain or loss in 0.1dB increments. Signals at the output of the GAIN

AMP are applied to and active slope-type amplitude equalizer consisting of

the EQUALIZATION ADJUST circuit and EQL AMP.

EQUALIZATION ADJUST circuit is controlled by the channel's front-panel

EQL switches. These switches allow selection of 0 to 7.5dB of gain at

2804Hz (re 1004Hz) in 0.5dB increments. Signals at the output of the EQL

AMP are applied to the POWER AMP, which drives the output transformer.

4.04 The 104001C can be optioned to provide 25mA of internally generated

sealing current to metallic facilities on the facility and/or terminal sides of the

module, to accept externally generated sealing current from the far ends of

the facilities on both sides of the module, to derive normal simplex leads on

both sides of the module, or to provide bypassed (straight-through) simplex-

lead signaling via a path separate from the transmit and receive transmission

paths. Each of the 104001C's two internal sealing-current sources has a

"ZAP" feature by which a greater amount of sealing current is provided for a

few seconds when power is initially applied to the module.

4.05 When the internal sealing-current source on the 4001's facility side is

selected, sealing current is fed to the external 4wire facility though the

transmit output port (pins 41 and 47) and is returned to the module through

the receive input port (pins 7 and 13). When the internal sealing-current

source on the 104001C's terminal side is selected, sealing current is fed to

the external 4wire facility through the transmit input port (pins 40 and 55)

and is returned to the module through the receive output port (pins 5 and 15).

When the externally supplied sealing current option is selected on either side

of the module, the center-tapped leads of the receive and transmit

transformers are connected together. This creates a return path that allows

the module to accept sealing current from an external source at the distant

end of the external facility. The third option setting provides normal simplex-

lead derivation at the module's facility-side and/or terminal-side ports. When

optioned for bypassed (i.e., straight-through) SX-lead signaling, an additional

switch optioned selects either normal (RCV IN SX to RCV OUT SX and

XMT IN SX to XMT OUT SX) or reversed (RCV IN SX to XMT IN SX and

RCV OUT SX to XMT OUT SX) straight-through signaling.

4.06 The 400C's facility-side (receive input and transmit output) transformers

are connected to both bridging and opening bantam-type test jacks, while the

terminal side (receive output and transmit input) transformers are connected

to opening bantam type test jacks only.

4.07 The Power Supply on the 104001C is simple series voltage regulator

that uses a zener diode as reference source. A series diode in the negative

input battery lead protects the circuit against reversed input-power

connections, and a transorb between input battery and ground limits high-

level supply transients to a safe level.

5. MECHANICAL OUTLINE

5.01 See FIGURE 2.

6. SPECIFICATIONS

Note: Transmit-channel and receive-channel specifications of the 104001C

are identical.

6.01 Electrical

Terminating impedances (all four ports):

1200, 600 or 150 ohms, balanced, switch-selectable

Flat Gain or Loss:

0 to 24dB of gain or 0 to 24dB of loss,

in switch- selectable 0.1dB increments,

with gain or loss selected via switch option

increments, prescription-set

Deviation from gain or loss setting indicated by front-panel switches:

Maximum Output Level:

Total Harmonic Distortion:

January 2014

FAX 503.646.3903

+0.25dB maximum, re 1000Hz

less than 1% at +10dBmoutput level

The

+10Bm