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Section I Model 3555B
Table 1-1. Specifications
VOICE FREQUENCY LEVEL MEASUREMENTS (20Hz balanced and 75 ohms unbalanced.
to 20kHz) Return loss: TERM ONLY
600 ohms: 26dB min 3kHz to 150kHz
Range: -91dBm to +31dBm 135 ohms: 26dB min to 600kHz
75 ohms: 30dB min to 3MHz
Level accuracy: 20Hz to 20kHz: +0.5dB Bridging loss: less than 0.05dB at 10kHz
40Hz to 15kHz: +-0.2dB Balance:
(Levels greater than -60dBm) greater than 70dB to 10kHz
Note: For levels greater than +1 dBm, level accuracy greater than 60dB to 100kHz
specification applies only for frequencies above greater than 40dB to 600kHz
100Hz.
GENERAL
Input: will terminate or bridge 600 ohms or 900 ohms Temperature range: 0°F to 120°F 0 to 95% relative
balanced. humidity
Bridging loss: less than 0.3 dB at 1kHz. The 3555B will operate at -40°F under reduced
Return loss: 30dB min. (50Hz to 20kHz) TERM specifications. At this temperature, attention
Return loss: 30dB min. (50Hz to 2kHz) TERM should be given to noting condition of battery as
only. indicated on Battery Test (DIAL/BAT).
Balance:
greater than 80dB at 60Hz Meter: linear dB scale indicates rms value of input
greater than 70dB to 6kHz signal. 12dB range.
greater than 50dB to 20kHz Meter response
Holding circuit: 700 ohms dc resistance, 60mA Normal: 200ms to indicate a reading to 0dBm on
max. loop current at 300Hz. With holding circuit meter.
in, above specs apply from 300Hz to 4kHz. Damp: 500ms to indicate a reading to 0dBm on
meter.
NOISE MEASUREMENTS
Maximum input voltage
Range: -1 dBm to +121dBm Tip to ring: 150V peak
Tip or ring to ground: 500V peak
Weighting filters: 3kHz flat, 15kHz flat, C-message, and (This is maximum instantaneous voltage. Input
program. Meets joint requirements of Edison circuit will withstand 48V dc CO battery with
Electric Institute and Bell Telephone System. superimposed 90V rms 20Hz ringing voltage or
±130V carrier supply.)
Input: same as for level measurements.
Maximum longitudinal voltage: 200V rms at 60Hz
Noise to ground:
80 kilohms across line AC Monitor: 0.27V rms for 0dBm on meter.
100 kilohms to ground R
out
= 8 kilohms. Available at DIAL/AC MON
-40dB relative to 600 ohms noise metallic at jacks. Sufficient to drive WE 1011B or 52 type
1kHz. headset.
DC Monitor: 1 volt for 0dBm on meter. R
out
= 2
CARRIER FREQUENCY LEVEL MEASUREMENTS kilohms. Jack accepts 310 plug (tip negative).
(30Hz to 3MHz)
Input jacks: will accept Western Electric (WE) 241,
Range: -61dBm to +11dBm 309, 310, 358 plugs. Binding posts accept banana
plugs, spade lugs, phone tips or bare wires.
Level accuracy: Removable shorting bar between sleeve and
600 ohms balanced ground binding posts.
1kHz to 150kHz: ±0.5dB Dial/AC Monitor jacks: will accept WE 289, 310, 347
135 ohms balanced (or 150 ohms balanced) plugs. Accepts WE 1011B lineman's handset or
1kHz to 600kHz: ±0.5dB 52 type headset.
10kHz to 300kHz: ±0.2dB
75 ohms unbalanced Power requirements:
100Hz to 600kHz: ±0.2dB Internal battery: single NEDA 202 45V "B"
30Hz to 1MHz: ±0.5dB battery included. Expected battery life - 180
1MHz to 3MHz: ±0.5dB ±10% of meter reading hours at 4 hours per day at 70° F.
in dBm. AC: 115V or 230V, 48-440Hz, <1W
External battery: 24V or 48V office battery; jack
Input: will terminate or bridge 600 ohms or 135 ohms accepts 310 plug (tip negative) less than 15mA.
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