TECHNICAL SPECIFICATIONS

IMPEDANCE

Off-Hook Resistance

• With a minimum loop current of 25mA the off-hook tip to ring DC resistance (loop test mode) should be less than 200 ohms.

Off-Hook Impedance

• The off-hook impedance between the tip and ring conductors measured at 25mA min. and 80mA max. (35mA nominal) is 600 ohms ± 120 ohms over the frequency range of 300Hz to 500Hz (loop test mode).

On-Hook Resistance

• DC resistance (idle) between tip and ring conductors is greater than 47K ohms for an applied voltage up to 100V, and greater than 25K ohms for an applied voltage of up to 200V.

On-Hook Impedance

• For applied AC ring voltages of 40 - 150 V RMS superimposed on a DC voltage of 56.5 V, the impedance between tip and ring shall be greater than 1600 ohm and not exceed 60K ohm for frequencies between 15.3 Hz and 68 Hz.

Ring Voltage Detection (General)

Voltage (On-hook)

• The Tester responds to the following ring signal between tip and ring: 40 - 150 V RMS, 15.3 Hz to 68 Hz, superimposed on a DC voltage of + 50 V. The ring voltage indicators shall not respond significantly to AC signals of less than 40 Vrms across tip and ring at any frequency from 5 to 1000 Hz.

LED Display and User Controls

Unless otherwise specified all voltage and indicator levels are ± 10% of the nominal values specified.

Line selection in two line networks

• Line selection is performed by sliding the LINE 1/2 Switch to the appropriate position. In the 1 position the inner Tip/Ring pair is tested; similarly, in the 2 position the outer Tip/Ring pair are used. All test functions perform normally in either position.

On-Hook DC Voltage Polarity

• Depressing the POLARITY switch enables the POLARITY LEDs for indicating a correct polarity in Green or reverse polarity in Red.

On-Hook DC Voltage Level

• Depressing the POLARITY switch employs the VOLTAGE LINE / RING LED display to detect the on-hook DC tip-ring voltage. The LEDs illuminate as: lower Red LED for VDC< 42V, the middle Green LED for 42V< VDC < 56.5V, and the upper Yellow LED for VDC> 56.5V.

On-Hook AC Voltage Ring Level

• In standby mode (no switches depressed), the VOLTAGE LINE / RING LED display is used to detect the on-hook AC tip-ring voltage. The LEDs illuminate in a strobing and analog manner as: lower Red LED for VAC< 80Vrms, the middle Green LED lights for 80Vrms< VAC < 110Vrms, and the upper Yellow LED lights for VAC >110 Vrms (VDC= -50 V DC).

Off-Hook Loop Current

• Depressing the LOOP TEST switch enables the LOOP TEST LED for indicating whether sufficient loop current is detected in the Off-Hook state. (Depressing both the LOOP TEST and POLARITY switches will not damage the Unit, but instead place the Tester in the off-hook/ answer state, see section 3.6). Manual Line Answer Off-Hook State
• Depressing the LOOP TEST switch enables the LOOP TEST LED and places the unit in the Off-Hook state

PHYSICAL ENVIRONMENTAL SPECIFICATIONS

Drop Test

• The BT-10 continues to operate after 18 random drops from a height of 5 feet.

Over Voltage

• The BT-10 must continue to meet specifications after a ten minute application of 150V AC max. (60 Hz, 2 seconds on - 4 seconds off - duty cycle) superimposed on ±75V DC max. across tip and ring in the On-Hook state (stand-by).

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