8
TS44DLX Deluxe Test Set
Users Guide
POL/LO mA
(Polarity/ low
mA) LEDs
Notes
The TS44DLX Deluxe Test Set is not polarity sensitive, and will function in either polarity.
The POL LEDs will not light if the test set is on-hook or when the speaker is on.
When the test set is off-hook, one of the two POL LEDs light to indicate the dc polarity of the line.
The green POL LED lights if the red test lead is connected to the Ring (negative) side of the line
and the black test lead is connected to the Tip (positive) side of the line. The red POL LED lights if
the test leads are reversed; that is, the red test lead is connected to the Tip (positive) side and the
black test lead is connected to the Ring (negative) side.
The POL LEDs double as low loop current indicators. When off-hook and the TEST key is pressed, if
the current reading is below 23 mA, the LED corresponding to the line polarity flashes for 5
seconds. If the loop current is normal, the LED lights solid. Low loop current may indicate a
problem on the line.
Electronic
Ringer
The electronic ringer is enabled while the test set is on-hook.
HI/LO VDC
(high/low
Vdc) LEDs
When the test set is on-hook and the TEST key is pressed, the test set measures the dc voltage
across Tip and Ring and indicates the voltage level as follows:
Voltage Range Indication
0 V to 2 V
LO Vdc LED lights for 5 seconds
2 V to 42 V
LO Vdc LED blinks for 5 seconds
42 V to 53 V (Normal CO battery voltage)
Both the LO Vdc and HI Vdc LEDs flash once
53 V to 140 V
HI Vdc LED blinks for 5 seconds
Above 140 V
HI Vdc LED lights for 5 seconds
For voltages that cause either LED to light solidly for 5 seconds, the test set will not allow off-hook
operation.
If the test set is placed in Talk mode on a loop with more than 140 Vdc, the test set locks out and
the HI Vdc LED remains lit until the test set is placed in Monitor mode or the voltage drops below
140 V.
Table 2. Test Set Keypad Control and Indicators (continued)
Key or
Indicator
Description (refer to Figure 3)
